BECKWITH ELECTRIC M-0420 Instruction Book Download Page 74

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M-0420 Instruction Book

5–10

Figure 5-3

Voltage Relay: Peak Overvoltage, 3-Phase (59I)

■

NOTE: Setpoints #2 are disabled as shipped, and do not appear on the menu. Use CONFIGURE

RELAYS menu to enable them.

PEAK OVERVOLTAGE #1
1.10PU

DELAY PEAK OVERVOLT #1
30 Cycles

PEAK OVERVOLTAGE #2
1.10PU

DELAY PEAK OVERVOLT #2
30 Cycles

SELECT

FUNCTION

ENTER
SETPOINT

SELECT

FUNCTION

ENTER
SETPOINT

SELECT

FUNCTION

ENTER
SETPOINT

EXIT

ENTER
SETPOINT

SELECT

FUNCTION

EXIT

ENTER

Rotate knob to setpoint value

ENTER

Rotate knob to setpoint value

ENTER

Rotate knob to setpoint value

ENTER

Rotate knob to setpoint value

Summary of Contents for M-0420

Page 1: ...ection 59I 2 1 Utility Side Ground Fault Protection and Phase Voltage Unbalance Protection 27N 59N 2 2 Phase Fault Protection 51V 67 2 2 Directional Power 32F 32R 2 2 Anti Motoring Protection 32R 2 2 Ground Fault Protection 59N 51N 50N 2 2 Negative Sequence Overcurrent Protection 46 2 3 Backup Phase Fault Protection 51VC VR 2 3 VT Fuse Loss Protection 60FL 2 3 Power OK Status 2 3 2 2 Trip Configur...

Page 2: ...ption 2 30 79 Reconnect Time Delay 2 32 60FL VT Fuse Loss Detection 2 33 2 7 Fault Recorder 2 33 Chapter 3 Front Panel Controls 3 1 Introduction 3 1 3 2 Target Status Indicators and Controls 3 3 3 3 Serial Interfaces COM1 and COM2 3 3 Chapter 4 Operation 4 1 Introduction 4 1 4 2 Software Flow 4 1 Power On Self Test and Status Screens 4 1 Default Message Screens 4 1 Access Screens 4 5 Menu Flow 4 5...

Page 3: ...st 7 9 COM2 Test 7 9 Other Diagnostic Mode Commands 7 10 Power On Self Test 7 11 59 RMS Overvoltage 3 Phase 7 12 59N RMS Overvoltage Neutral Circuit or Zero Sequence 7 14 59I Peak Overvoltage 7 16 27 RMS Undervoltage 3 Phase 7 18 27N RMS Undervoltage Neutral Circuit or Zero Sequence 7 20 60 FL V T Fuse Loss Detection 7 22 81O Over Frequency 7 23 81U Under Frequency 7 24 50 Instantaneous Overcurren...

Page 4: ...tion of RMS Value of the Signal A 4 Instantaneous Peak Voltage A 5 Estimation of the Fundamental Frequency A 5 Calculation of Sequence Components A 6 Calculation of Power Power Factor A 6 Implementation of Inverse Time Overcurrent Relay Curves A 7 A 4 Acknowledgments A 7 A 5 References A 7 Appendix B Self Test Error Codes Appendix C Communications C 1 Introduction C 1 C 2 The BECOCOM Protocol C 1 ...

Page 5: ...le of Trip Characteristics Over and Under Frequency 2 11 2 8 Ground Fault Detection Using 59N and Broken Delta VTs 2 16 2 9 Ground Fault Detection Using 27N and 59N with One VT 2 17 2 10 Voltage Restraint 51VR Characteristic 2 18 2 11 Definite Time Overcurrent Curve 2 20 2 12 Inverse Time Overcurrent Curve 2 21 2 13 Very Inverse Time Overcurrent Curve 2 22 2 14 Extremely Inverse Time Overcurrent C...

Page 6: ...rse Time Overcurrent Neutral 51N Instantaneous Overcurrent Neutral 50N 5 18 5 12 Current Relay Negative Sequence Overcurrent 46 5 19 5 13 Power Relay Forward Overpower 32F 5 20 5 14 Power Relay Reverse Overpower 32R 5 21 5 15 Reonnect Relay 79 5 22 5 16 Review Setpoints 5 23 5 17 Configuration of Phase Overcurrent Relay 67 Enabled 5 24 5 18 Example of Target History Screens 5 27 Chapter 6 Installa...

Page 7: ...m A 4 A 3 Phasor Diagram A 6 Appendix C C 1 Null Modem Cable M 0420 COM1 to PC 9 pin C 3 C 2 Null Modem Cable M 0420 COM2 to PC 25 pin C 3 Appendix D D 1 M 0420 Board Interconnections D 1 Appendix E Configuration Record Forms E 1 Functional Configuration Record E 2 E 2 Voltage Relay Setpoint Configuration Record E 3 E 3 Frequency Relay Setpoint Configuration Record E 4 E 4 Current Relay Setpoint C...

Page 8: ...VR Setpoint Ranges 2 19 2 8 Inverse Time Overcurrent Neutral 51N Setpoint Ranges 2 24 2 9 Instantaneous Overcurrent 50 and Instantaneous Overcurrent 50N Neutral Setpoint Ranges 2 25 2 10 Negative Sequence Overcurrent 46 Setpoint Range 2 26 2 11 Directional Power 32 Setpoint Ranges 2 29 2 12 Phase Directional Overcurrent 67 Setpoint Ranges 2 30 2 13 Reconnect Time Delay 79 Setpoint Ranges 2 32 Chap...

Page 9: ...rrent inputs along with the status contact inputs When the breaker opens as indicated by the 52b contact the waveform data is stored in memory for later review when investigating the cause of the trip Compact Size The relay occupies a panel space less than 8 inches wide and 21 inches high yet can operate fourteen protective functions Operation All settings can be established or changed using the f...

Page 10: ...or information on enabling specific functions and entering setpoints If you are responsible for the mechanical and electrical installation of the relay please refer to Chapter 6 Installation If you are interested in a description of the re lay s capabilities please read this Introduction thoroughly and refer to Appendix A Theory of Operation for more detailed information Please don t hesitate to c...

Page 11: ...EE Std C37 2 1979 Standard Electric Power Systems Device Function Numbers n o i t c n u F n o i t p i r c s e D 7 2 e s a h p 3 e g a t l o v r e d n U S M R N 7 2 e c n e u q e S o r e Z r o t i u c r i C l a r t u e N e g a t l o v r e d n U S M R 2 3 d n a F 2 3 d r a w r o F e s a h p 3 y a l e R r e w o P l a n o i t c e r i D R 2 3 e s r e v e R 6 4 e s a h p 3 y a l e R t n e r r u c r e v ...

Page 12: ...lt data that occur dur ing a system disturbance Figure 1 1 Traditional Relaying vs the M 0420 Multifunction Relay AF 50 51V BF BF CF CF Phase Voltage Relay Functions Phase Current Relay Functions 81 O U 32 3F 46 Directional Power Relay Function Reconnect Time Delay Relay Function 79 59I 50 51 N 27 59 N Peak Overvoltage Relay Function Negative Sequence Current Unbalance Relay Function 59I Neutral V...

Page 13: ...ctions monitors the keyboard for operator requests updates memo ries for setpoint values facilitates operator inter action via the alphanumeric display establishes two way communication using the RS 232C se rial ports analyzes the data from the DSP and issues the trip commands Figures 1 2 and 1 3 present a general overview of the hardware design and functional operation of the relay As shown in th...

Page 14: ...t Board Relay Outputs Contact Inputs 2 Line by 24 Character Liquid Crystal Display 32K byte RAM EEPROM RAM Clock 10 Year Lithium Battery Power Supply Board Power Supply i i i v v v i a b c i i Opto Isolation Opto Isolation Temperature Sensor COM1 COM2 Figure 1 3 M 0420 Functional Diagram ANALOG INPUTS M 0420 MULTIFUNCTION RELAY 1 FILTERS 2 MUX 3 PGA 4 ADC DIGITAL SIGNAL PROCESSOR SERIAL INTERFACE ...

Page 15: ... running the M 0429A BECOCOM Com munications Software Once downloaded the data can be analyzed using the associated M 0428A BECOPLOT Fault Data Analysis Software pack age The fault data analysis software runs on an MS DOS computer enabling the user to plot fault data specifying which waveforms and inputs are displayed and at what scale The sample plot shown in Figure 1 4 displays all waveforms A m...

Page 16: ...tional When the 1 A input option is chosen the relay internally scales the current by a factor of 5 and the settings and status display work as though the 5 A nominal neutral current is selected With the 1 A neutral current input the current related settings and status display values should be divided by 5 to obtain the actual current values H H e l p X Z m i n x Z m o u t Y Z m i n y Z m o u t N ...

Page 17: ...em RS 232 cable for direct connection between a PC and the M 0420 front panel COM1 port This cable has DB9 9 pin connectors at each end 1 9 References The references that follow provide additional in formation about the use of digital technology in protective relaying References 12 and 13 present more detailed information about the design and relay applications and are available upon request from ...

Page 18: ... Toronto Ontario May 1991 12 Murty V V S Yalla Donald L Hornak A Digital Multifunction Relay for Intertie and Generator Protection Canadian Electrical Association 1992 Spring Meeting Vancou ver B C March 1992 13 Murty V V S Yalla A Digital Multifunction Protective Relay IEEE Transactions on Power Delivery Vol 7 No 1 January 1992 pp 193 201 ...

Page 19: ...tifunction Relay in intertie or generator protection Section 2 6 Functions discusses the individual functions in detail presenting setpoint ranges increments and the initial default settings Islanding Protection 81U 81O 27 59 When a dispersed source of generation DSG is suddenly islanded the frequency will quickly shift from 60 0 Hz except for the improbable case of an exact generation and load ma...

Page 20: ...rgi zation of the generator on turning gear When line side CT inputs are used this function can also provide high speed protection against gen erator winding faults However with line side CTs the protection against winding faults during off line operation when the breaker is open is not available from the 51V 50 46 or 67 functions Calculation of the current used for tripping is a unique feature of...

Page 21: ... the overcurrent is due to a fault by activating the function only when the voltage is below the voltage control setpoint Additionally the relay can determine the equivalent high side voltages of delta wye unit transformers through its internal software thus eliminating the need for auxiliary instrument transformers VT Fuse Loss Protection 60FL If the internal blown fuse detection is enabled or th...

Page 22: ...e of the power transformer c 51V may be either 51VC or 51VR with or without directional 67 control d 67 Phase Directional Overcurrent is optional e 60FL VT Fuse Loss detector f M 0420 trips and initiates permissive reconnect for the 52I circuit breaker When GENERATOR is selected the following conditions must be true The 52b status input must be connected High speed reverse power must not be se lec...

Page 23: ...al Status Common 52b Breaker Status Input Chassis Ground UTILITY GENERATOR 11 12 IN R n NOTES a If voltage is used for generator neutral fault detection the 59N input is not available for utility ground fault monitoring at terminals 19 and 20 b The Neutral Current input can be used either at the transformer neutral or the generator neutral but not both simultaneously Figure 2 2 Intertie Protection...

Page 24: ...Enable 27 Blocking Enable 67 Blocking Enable 32R Blocking 67 32R 51V 27 NOTES a When the high speed setting has been selected for the 32R or 67 functions the respective blocking function should not be enabled b If 51V blocking is enabled when a blown VT fuse condition is detected the M 0420 disables 51VC if VC is enabled or disables VR of 51VR keeping the tap setting at the value established for t...

Page 25: ...ither 51VC or 51VR with or without directional 67 control c 67 Phase Directional Overcurrent function is optional d 60FL VT Fuse Loss detector Figure 2 4 Generator Protection Typical One Line Diagram 2 4 Generator Protection The system one line diagram shown in Figure 2 4 and the system three line diagram shown in Figure 2 5 illustrate the typical generator protec tion capabilities of the M 0420 M...

Page 26: ...B C a c Power Transformer Vc Vb Va b SYSTEM RELAY SYSTEM RELAY 32 52 33 60 F L Input External Status Common 52b Breaker Status Input 30 24 Chassis Ground a c b AC Circuit Breaker 52 11 12 IN 19 20 VN Generator n NOTE a The neutral current input can be used either at the transformer neutral or the generator neutral but not both simultaneously ...

Page 27: ...V is controlled by the directional element of 67 51V will be blocked when 67 is blocked 27N 81O 81U 32F Enable Internal VT Fuse Loss 60 F L Input External VT fuse loss contact input from supplementary device 60 59 59N 59I 50 50N 51N 46 52b breaker status input OR OR OR OR NOT NOT VT Fuse Loss Output Trip Output Trip Annunciate Output NOT RT 0 Reconnect Enable Output AND AND AND NOT AND NOT AND NOT...

Page 28: ...o Phase Faults Protective Device Function Offline Synchronizing On Line 50 51 VR 46 67 Applicable Protection Applicable Protection Not Applicable Applicable Protection MSA must be set towards generator CTs on Neutral Side CTs on Line Side Not Applicable Not Applicable NOTE The 67 phase directional overcurrent function is optional Using the 67 function for protec tion against inadvertent energizing...

Page 29: ...ted time delay may be set from the minimum relay operating time of 2 cycles to 8160 cycles Specific user requirements may mean that this function will be programmed for example to trip at 240 cycles if the frequency increases to 60 2 Hz but trip at 10 cycles at 61 Hz a first approximation of an inverse characteristic shown in Figure 2 7 As illustrated in this figure the under frequency setpoints a...

Page 30: ...n line to help avoid a complete system collapse If this is the objective it may be useful to set one underfrequency characteristic at 57 5 to 58 0 Hz with a very short time delay but allowing a higher frequency say 59 0 Hz to be maintained for several seconds N O I T C N U F E G N A R T N I O P T E S T N E M E R C N I L A I T I N I G N I T T E S O 1 8 y c n e u q e r f r e v O 2 1 e d u t i n g a ...

Page 31: ...ie Protection of Consumer Owned Sources of Generation 3 MVA or Less IEEE Publication 88TH0224 6 PWR CAUTION When 69 3 V is chosen for the VT secondary voltage 69 3 V is internally converted to 120 V 1 pu for all calculations and for setting and display purposes For example if a pickup of 73 V 1 1 pu is desired when 69 3 V has been chosen for the VT secondary voltage this will be displayed and ente...

Page 32: ...e tripping action at 1 2 x 170 204 V as instanta neously detected Note that because of the non sinusoidal voltage waveform expected the rms value of this voltage cannot be so simply calcu lated as 204 V S2 144 Volts but may be very much less than that value One suggestion is that this function be set at 1 3 to 1 5 per unit with the time delay set to operate very quickly i e at less than 10 cycles ...

Page 33: ... This is true regardless of the setting of internal configuration DIP switch 8 Other 27N 59N applications shown in Figures 2 11 and 2 12 are for detecting ground faults on the utility side of the power transformer Protection schemes are applied based on using one or three voltage transformers VT CAUTION When 69 3 V is chosen for the VT secondary voltage 69 3 V is internally converted to 120 V 1 pu...

Page 34: ...ll rise above zero with any zero sequence unbalanced condition as will be expected with any real world utility ground fault When the relay burden is small the transformers in this scheme will be subject to ferroresonance and high voltage oscillations unless a shunt re sistor is used The shunt resistor will damp high transient voltage oscillations and will usually hold peak values to less than twic...

Page 35: ...pearing at the VT initiating operation of the 59N For this scheme to work the capacitance to ground of the lines must be fairly closely balanced and high enough to keep the neutral of the system at close to ground potential The shunt resistor helps to minimize the chance of ferroresonance or neutral inversion Applied Protective Relaying Westing house Electric Corporation 1982 CAUTION This scheme s...

Page 36: ...concerns the calculation of the current used for tripping The current is derived from an rms calculation but by user selection will be computed based on either inclusion or exclusion of the contribution of harmonics to the value Since it is not well established by the industry whether the calculation should be based simply upon the fundamental frequency component or a broader frequency range a sim...

Page 37: ...f the 51V function such as voltage control voltage restraint voltage transformations for delta wye unit transformers and directional control can be programmed by the operator N O I T C N U F E G N A R T N I O P T E S T N E M E R C N I L A I T I N I G N I T T E S t n i a r t s e R e g a t l o V d n a l o r t n o C e g a t l o V h t i w e s a h P 3 t n e r r u c r e v O e m i T e s r e v n I V 1 5 s...

Page 38: ... 04 Time Seconds 11 9 7 5 4 3 2 1 0 5 1 1 5 2 3 4 5 6 7 8 9 10 12 14 16 18 20 Current in Multiples of Tap Setting Time Dial NOTE An additional one cycle time delay should be added to these curves in order to obtain the relay operating time Figure 2 11 Definite Time Overcurrent Curve ...

Page 39: ... 20 Current in Multiples of Tap Setting Time Dial 60 40 30 20 10 6 4 3 2 1 0 0 6 0 4 0 3 0 2 0 1 0 06 0 04 Time Seconds NOTE An additional one cycle time delay should be added to these curves in order to obtain the relay operating time Figure 2 12 Inverse Time Overcurrent Curve ...

Page 40: ...18 20 Current in Multiples of Tap Setting Time Dial 60 40 30 20 10 6 4 3 2 1 0 0 6 0 4 0 3 0 2 0 1 0 06 0 04 Time Seconds NOTE An additional one cycle time delay should be added to these curves in order to obtain the relay operating time Figure 2 13 Very Inverse Time Overcurrent Curve ...

Page 41: ...rves in order to obtain the relay operating time Figure 2 14 Extremely Inverse Time Overcurrent Curve 11 9 7 5 4 3 2 1 0 5 1 1 5 2 3 4 5 6 7 8 9 10 12 14 16 18 20 Current in Multiples of Tap Setting Time Dial 60 40 30 20 10 6 4 3 2 1 0 0 6 0 4 0 3 0 2 0 1 0 06 0 04 Time Seconds 0 03 0 02 ...

Page 42: ...m zero sequence cur rent value If the 51N function is not used at the generator neutral circuit it can be used to detect ground faults on the system by monitoring the current through the ground connection of a wye connected power transformer N O I T C N U F E G N A R T N I O P T E S T N E M E R C N I L A I T I N I G N I T T E S N 1 5 l a r t u e N t n e r r u c r e v O e m i T e s r e v n I s e v ...

Page 43: ...l c y c 2 r o f g n i t t e s p a t t n e r r u c r e v o e s a h p m u m i x a m e h t s e m i t 0 2 d e e c x e o t t o N V 1 5 r o f n e s o h c e g n a r e h t N 0 5 l a r t u e N t n e r r u c r e v O s u o e n a t n a t s n I e d u t i n g a M A 0 0 4 2 o t 0 1 A 1 0 A 0 0 1 e m i T p i r T e s n o p s e R m u m i x a m s e l c y c 2 e h t r o f g n i t t e s p a t t n e r r u c r e v o e s ...

Page 44: ... to avoid nuisance tripping The maximum delay can be set by the user to reduce the tripping times for modest imbalances An important feature that helps protect the generator from damage due to recurring imbalances is a linear reset characteristic when I2 decreases below the pickup value the trip timer takes 4 minutes to reset from its 100 trip level Figure 2 15 illustrates the inverse time charact...

Page 45: ...00 80 60 40 20 10 8 6 4 2 1 0 6 0 4 0 2 0 1 600 800 1000 2000 4000 1500 3000 Definite Maximum Time Setting Range Pickup Setting Range NOTE These curves are valid only for cases where the phase current is less than 30 A A D converter full scale When the phase current exceeds 30 A the actual times will be longer than the ones shown here Figure 2 15 Negative Sequence Overcurrent Inverse Time Characte...

Page 46: ...or motoring power flowing into the generator For interconnection protection with VT and CT connections as illustrated in Figure 2 2 reverse power is defined as power flow into the generator customer forward power as power flow to the utility CAUTION Proper CT polarity is important in defining the direction of power flow The base volt amperes per unit for line to line and line to neutral operation ...

Page 47: ... y c 0 1 s e l c y c 0 3 5 7 0 e m i t e s n o p s e r y a l e d l a n o i t n e t n i o n s a h g n i t t e s d e e p s h g i h y a l e D e m i T e l c y c K e l c y c 5 0 Table 2 11 Directional Power 32 Setpoint Ranges 67 Phase Directional Overcurrent Option For intertie protection applications the phase directional overcurrent relay allows greater selectivity for utility system faults since the...

Page 48: ... 2 o t 1 A 1 0 A 0 0 1 y a l e D e m i T s e l c y c 0 6 1 8 o t 1 e l c y c 0 1 s e l c y c 0 3 t n e m e l E l a n o i t c e r i D y t i v i t i s n e S m u m i x a M A S M e l g n A e u q r o T 0o 9 5 3 o t o 1o 5 8 o A S M t a y t i v i t i s n e S e c n e u q e s e v i t i s o p A V 5 0 y r o m e M t l u a f e r P e g a t l o v e c n e u q e s e v i t i s o p s e l c y c 8 s e i t i t n a u Q...

Page 49: ...ensitivity Line Maximum Sensitivity Line BLOCKING MSA 300 MSA 300 NOTE V1 Positive Sequence Voltage I1 Positive Sequence Line Current at MSA For forward power unity power factor condition V1 and I1 are in phase both for line to ground and line to line VT input conditions with line to line VTs thirty degrees phase shift is corrected internally in the software Figure 2 16 Phase Directional Overcurre...

Page 50: ...er on the trip output contact N O I T C N U F E G N A R T N I O P T E S T N E M E R C N I L A I T I N I G N I T T E S 9 7 y a l e D e m i T t c e n n o c e R y a l e R e s o l C t c e n n o c e R s e l c y c 0 6 1 8 o t 1 e l c y c 0 1 s e l c y c 0 6 e h t y b d e m m a r g o r p e r l i t n u y r o m e m t n i o p t e s n i s i e u l a v e h T g n i t t e S l a i t i n I r o t a r e p o Table 2 ...

Page 51: ...ONFIGURE V T FUSE LOSS menu under the CONFIGURE RELAYS menu selection In these cases and since the detection algorithm cannot detect the condition of all three fuses being blown two in case of open delta the M 0420 s external contact input on terminal 33 usually from a supplemental device 60 can be used as an external indication of a blown VT fuse The status of the fuses can be determined by selec...

Page 52: ...a the BECOCOM communications software Rearming the fault recorder restarts the process overwriting the stored fault data You can determine the status of the fault recorder whether armed or not and if armed whether triggered or not through the front panel or via remote communications using BECOCOM NOTE The fault recorder is initially disarmed after power up Auto Rearming The fault recorder can also...

Page 53: ...alue These menus consist of two lines The bottom line lists lower case abbreviations of each menu selection with the current menu selection highlighted by being in uppercase The top menu line provides an expanded description of the current menu selection When you re not using the controls and the relay has not tripped the LCD is blanked and remains blanked until you press ENTER at which time the f...

Page 54: ... 50 N INSTANTANEOUS OVERCURRENT 32 DIRECTIONAL OVERPOWER 46 NEGATIVE SEQUENCE OVERCURRENT TARGET RESET LAMP TEST SERIAL INTERFACE COM 1 ENTER SETPOINT SELECT FUNCTION RELAY OK ENTER EXIT PHASE ELEMENTS NEUTRAL ELEMENTS VOLTAGE RELAY VOLT freq curr powr FAULT RECORDED BREAKER CLOSED Liquid Crystal Display User Interface Indicators and Controls Target Status Indicators and Controls Rotary Knob Targe...

Page 55: ...ght arrow button or rotary knob to display the RELAY OK LED FLASH menu and select either DISABLE or ENABLE Fault Recorded LED The red FAULT RECORDED LED will light to indicate that fault data has been recorded in the unit s memory in response to a 52b breaker open status if the fault recorder has been armed You can arm or disarm the fault recorder using the FAULT RECORDER menu selection Breaker Cl...

Page 56: ...M 0420 Instruction Book 3 4 This Page Intentionally Left Blank ...

Page 57: ... applicable target This sequence is illustrated in Figure 4 3 In either case pressing ENTER will begin local mode operation displaying the access code entry screen or if no access code has been defined the first level menu 4 1 Introduction While the M 0420 Multifunction Relay is a sophisticated unit that performs a number of complex functions care has been taken to make it easy to use This chapter...

Page 58: ...ric Co Software Version Serial Number System Date and Time Model Number D 0020V04 01 32 M 0420 Beckwith Electric Co Default Logo Default Message Screens 0 5 minute access lockout Trip Target Screens Access Screens optional Main Menu Flow recon setpts stat config targets fault_rec count comm setup exit VOLT freq curr powr VOLTAGE RELAY OVERVOLTAGE SETPOINTS PHASE_OVER phase_under nutrl_over nutrl_u...

Page 59: ...N SELFTESTS PASS POWER ON SELFTESTS SERIAL NUMBER 114 06 15 93 15 24 32 Self Tests M 0420 Beckwith Electric Co Beckwith Electric Beckwith Electric Co Beckwith Electric Co Software Version Serial Number System Date and Time Model Number D 0020V04 01 32 M 0420 Beckwith Electric Co Default Logo ...

Page 60: ...period of time if screen blanking is enabled Default Message Screen Blanked Screen after several seconds Default Message Screens ENTER ENTER Trip Target Screens additional status screens if necessary continuously cycles through these screens NEUTRAL TIME OVERCURRENT Trip 47 TRGT 06 22 93 10 19 12 ENTER from most screens after 5 minutes default message screen briefly displayed TRGT 06 22 93 10 19 1...

Page 61: ...arrow at one or both sides of the display signi fies that the display will scroll in that direction As a prompt the SELECT FUNCTION LED lights to signify that a menu selection should be made Once the desired menu selection has been high lighted it is chosen by pressing the ENTER but ton Depending on the menu selection chosen the display shows either a second level menu with the SELECT FUNCTION LED...

Page 62: ... select digit to increment or decrement displayed value LEVEL 1 ACCESS GRANTED Access Screen EXIT ENTER SETPOINT SELECT FUNCTION ENTER ACCESS DENIED 5 minute access lockout on third failed attempt A c c e s s c o d e s a r e optional To disable this function the default setting set the Level 3 access code to 9999 to First Level Menu from Default Message screens Figure 4 4 Access Screens ...

Page 63: ...NCTION ENTER SETPOINT return to previous menu level EXIT ENTER to enter displayed setpoint value into memory to select digit to select digit to increment or decrement displayed value beginning with the selected digit selected digit underlined ENTER SETPOINT SELECT FUNCTION ENTER EXIT VOLTAGE VOLT freq curr powr OVERVOLTAGE SETPOINTS PHASE_OVER phase_under PHASE OVERVOLTAGE 1 132 VOLTS 1 10 PU nutr...

Page 64: ...tons if desired Access codes can be altered by choosing the ALTER ACCESS CODES menu selection under the SETUP UNIT menu CAUTION If you forget your access code you will have to contact the factory for informa tion on resetting the unit 4 6 Enabling and Disabling Relay Functions Each relay function can be individually enabled or disabled via the CONFIGURE RELAY menu selection To enable or disable a ...

Page 65: ...rizes the main menu flow The functions in this chapter are presented in the same order as on the main menu NOTES The descriptions assume that the relay settings are enabled or disabled as shipped from the factory see Figure 7 1 Setpoint Configuration Record Forms are provided in Appendix E Configuration Record Forms These forms provide a comprehensive standardized means of recording setpoint value...

Page 66: ...tion provides access to the power functions Figures 5 13 and 5 14 illustrate the software flow for these func tions Setpoint ranges and initial settings are pro vided in Chapter 2 Application and in the Specifications at the front of this book Reconnect Relay RECONNECT RELAY B RECON C The RECONNECT RELAY menu selection pro vides access to the reconnect function Figure 5 15 illustrates the software...

Page 67: ... by other functions or menu selections for example the 51V function can be directionally controlled by enabling the directional control selection for the 51V function under the configuration menu Note that disabling unused functions improves the response of the user indicators and controls Trip Circuit Type TRIP CIRCUIT TYPE INTERTIE generator The M 0420 Multifunction Relay can be optimized for ei...

Page 68: ...se and the neutral currents at 16 samples per cycle 960 Hz and from the 52b and 60 FL status inputs at 480 Hz The FAULT RECORDER menu selection enables you to determine the status of the fault recorder whether armed or not and if armed whether triggered or not and to arm or disarm the recorder Fault recorder information can be downloaded via the RS 232C ports to an IBM compatible personal computer...

Page 69: ...29A BECOCOM M 0428A BECOPLOT Software User s Guide and to Appendix C Com munications of this Instruction Book for detailed information about these functions Configure COM 1 Configure COM 2 CONFIGURE COM1 COM1 com2 com_adr accssC The CONFIGURE COM1 and CONFIGURE COM2 menu selections enable you to set the baud rate and parity for the front and rear panel RS 232C ports The relay can communicate at up...

Page 70: ...tem power is turned on Alter Access Codes ALTER ACCESS CODES vers ACCESS time dispC The ALTER ACCESS CODES menu selection enables you to define and change access codes The relay supports three levels of access codes Level 3 access access to all relay functions including defining or changing access codes Level 2 access read and change setpoints monitor status view trip history Level 1 access read s...

Page 71: ... T PHASE RATIO 1 0 1 C T NEUTRAL RATIO 1 0 1 In order for the M 0429A BECOCOM Communications Software program to properly display primary values for voltages currents and power the program must have available the appropriate VT and CT ratios For this reason the relay can be programmed with VT and CT ratios During communications these ratios are transmitted to the BECOCOM program These ratios are a...

Page 72: ...se Directional Overcurrent Setpoints Phase Inst Overcurrent Setpoints Neutral Overcurrent Setpoints Neutral Inst Overcurrent Setpoints Negative Sequence Overcurrent Setpoints CURRENT RELAY volt freq CURR powr Status Armed Triggered Arm Recorder Disarm Recorder Auto Re Arm Recorder FAULT RECORDER targets FAULT_REC Trip Counter Close Counter Alarm Counter Power Loss Counter Clear Trip Counter Clear ...

Page 73: ...VERVOLTAGE 2 132 Volts 1 10PU VOLTAGE RELAY VOLT freq curr powr ENTER SELECT FUNCTION ENTER SETPOINT EXIT EXIT EXIT ENTER SETPOINT SELECT FUNCTION ENTER SETPOINT SELECT FUNCTION ENTER SETPOINT SELECT FUNCTION PHASE OVERVOLTAGE 1 132 Volts 1 10PU DELAY PHASE OVERVOLT 1 30 Cycles SELECT FUNCTION ENTER SETPOINT ENTER SETPOINT SELECT FUNCTION ENTER Rotate knob to setpoint value ENTER Rotate knob to se...

Page 74: ...OVERVOLTAGE 1 1 10PU DELAY PEAK OVERVOLT 1 30 Cycles PEAK OVERVOLTAGE 2 1 10PU DELAY PEAK OVERVOLT 2 30 Cycles SELECT FUNCTION ENTER SETPOINT SELECT FUNCTION ENTER SETPOINT SELECT FUNCTION ENTER SETPOINT EXIT EXIT EXIT ENTER SETPOINT SELECT FUNCTION EXIT ENTER Rotate knob to setpoint value ENTER Rotate knob to setpoint value ENTER Rotate knob to setpoint value ENTER Rotate knob to setpoint value A...

Page 75: ...TPOINT ENTER SETPOINT SELECT FUNCTION PHASE UNDERVOLTAGE 1 108 Volts 90PU DELAY PHASE UNDERVOLT 1 30 Cycles PHASE UNDERVOLTAGE 2 108 Volts 90PU SELECT FUNCTION ENTER SETPOINT ENTER SETPOINT SELECT FUNCTION ENTER SETPOINT SELECT FUNCTION ENTER SETPOINT SELECT FUNCTION ENTER ENTER EXIT EXIT EXIT VOLTAGE RELAY VOLT freq curr powr ENTER Rotate knob to setpoint value ENTER Rotate knob to setpoint value...

Page 76: ...ENTER SETPOINT ENTER SETPOINT SELECT FUNCTION NEUTRAL OVERVOLTAGE 1 150 Volts 1 25PU DELAY NEUTRL OVERVOLT 1 30 Cycles NEUTRAL OVERVOLTAGE 2 150 Volts 1 25PU VOLTAGE RELAY VOLT freq curr powr SELECT FUNCTION ENTER SETPOINT ENTER SETPOINT SELECT FUNCTION ENTER SETPOINT SELECT FUNCTION ENTER SETPOINT SELECT FUNCTION ENTER ENTER Rotate knob to setpoint value ENTER Rotate knob to setpoint value ENTER ...

Page 77: ...IT SELECT FUNCTION ENTER SETPOINT ENTER SETPOINT SELECT FUNCTION NEUTRAL UNDERVOLTAGE 1 60 Volts 50PU DELAY NEUTRL UNDERVOLT 1 30 Cycles NEUTRAL UNDERVOLTAGE 2 60 Volts 50PU VOLTAGE RELAY VOLT freq curr powr SELECT FUNCTION ENTER SETPOINT ENTER SETPOINT SELECT FUNCTION ENTER SETPOINT SELECT FUNCTION ENTER SETPOINT SELECT FUNCTION ENTER ENTER ENTER Rotate knob to setpoint value ENTER Rotate knob to...

Page 78: ...T SELECT FUNCTION ENTER SETPOINT ENTER SETPOINT SELECT FUNCTION SELECT FUNCTION ENTER SETPOINT ENTER SETPOINT SELECT FUNCTION ENTER SETPOINT SELECT FUNCTION ENTER SETPOINT SELECT FUNCTION EXIT EXIT EXIT ENTER ENTER ENTER Rotate knob to setpoint value ENTER Rotate knob to setpoint value ENTER Rotate knob to setpoint value ENTER Rotate knob to setpoint value NOTE Setpoints 2 are disabled as shipped ...

Page 79: ...ELAY UNDERFREQUENCY 1 30 Cycles UNDERFREQUENCY 2 59 50 Hz FREQUENCY RELAY volt FREQ curr powr EXIT EXIT SELECT FUNCTION ENTER SETPOINT ENTER SETPOINT SELECT FUNCTION SELECT FUNCTION ENTER SETPOINT ENTER SETPOINT SELECT FUNCTION ENTER SETPOINT SELECT FUNCTION ENTER SETPOINT SELECT FUNCTION EXIT EXIT EXIT ENTER ENTER Rotate knob to setpoint value ENTER Rotate knob to setpoint value ENTER Rotate knob...

Page 80: ...ER SETPOINT ENTER SETPOINT SELECT FUNCTION ENTER SETPOINT SELECT FUNCTION ENTER SETPOINT SELECT FUNCTION ENTER EXIT EXIT EXIT CURRENT RELAY volt freq CURR powr OVERCURRENT SETPOINTS PHASE_OVER nutrl_over TIME DIAL PHASE OVERCURR 5 0 VOLTAGE CONTROL OVERCURR 132 Volts 1 10 PU ENTER B def definite time inv inverse vinv very inverse einv extremely inverss ENTER Rotate knob to setpoint value ENTER SET...

Page 81: ...Amps A B ENTER SETPOINT SELECT FUNCTION EXIT DELAY PHASE DIR OVERCUR 30 Cycles ENTER SETPOINT SELECT FUNCTION EXIT PICKUP PHASE DIR OVERCUR 10 0 Amps ENTER SETPOINT SELECT FUNCTION EXIT ANGLE DIR ELEMENT 85 DEG Rotate knob to setpoint value ENTER Rotate knob to setpoint value ENTER Rotate knob to setpoint value ENTER Rotate knob to setpoint value ENTER Figure 5 10 Current Relay Phase Directional O...

Page 82: ...TIMING NUTRL OVERCURRENT def inv VINV einv TIME DIAL NUTRL OVERCURR 5 0 Amps EXIT SELECT FUNCTION ENTER SETPOINT ENTER SETPOINT SELECT FUNCTION SELECT FUNCTION ENTER SETPOINT ENTER SETPOINT SELECT FUNCTION ENTER SETPOINT SELECT FUNCTION ENTER SETPOINT SELECT FUNCTION NUTRL INST OVERCURRENT 10 0 Amps ENTER ENTER EXIT ENTER Rotate knob to setpoint value ENTER Rotate knob to setpoint value EXIT EXIT ...

Page 83: ...T FUNCTION EXIT EXIT EXIT EXIT CURRENT RELAY volt freq CURR powr OVERCURRENT SETPOINTS NEG_SEQ_OVER TAP NEG SEQ OVERCURRENT 5 0 Amps PICKUP NEG SEQ OVERCURR 50 TIMING NEG SEQ OVERCURR I_SQUARED_T TIME DIAL NEG SEQ OVRCUR 25 MAX TIME NEG SEQ OVERCUR 10000 Cycles ENTER ENTER ENTER Rotate knob to setpoint value ENTER Rotate knob to setpoint value ENTER Rotate knob to setpoint value ENTER Rotate knob ...

Page 84: ...se FORWARD OVERPOWER 3 00 PU DELAY FORWARD POWER 30 Cycles POWER RELAY volt freq curr POWR SELECT FUNCTION ENTER SETPOINT ENTER SETPOINT SELECT FUNCTION SELECT FUNCTION ENTER SETPOINT ENTER SETPOINT SELECT FUNCTION ENTER ENTER EXIT ENTER Rotate knob to setpoint value EXIT EXIT ENTER Rotate knob to setpoint value ...

Page 85: ... RELAY volt freq curr POWR EXIT EXIT SELECT FUNCTION ENTER SETPOINT ENTER SETPOINT SELECT FUNCTION EXIT ENTER SELECT FUNCTION ENTER SETPOINT ENTER SETPOINT SELECT FUNCTION ENTER ENTER Rotate knob to setpoint value Rotate knob to make selection ENTER Rotate knob to setpoint value Figure 5 14 Power Relay Reverse Overpower 32R ...

Page 86: ...Reconnect Relay 79 RECONNECT SETPOINTS RECON DELAY RECONNECT 60 Cycles RECONNECT RELAY RECON SELECT FUNCTION ENTER SETPOINT SELECT FUNCTION ENTER SETPOINT ENTER ENTER EXIT EXIT ENTER SETPOINT SELECT FUNCTION ENTER Rotate knob to setpoint value ...

Page 87: ...INTS SETPTS stat config ROTATE KNOB TO REVIEW SETPOINTS PHASE OVERVOLTAGE 1 132 Volts 1 10PU DELAY PHASE OVERVOLT 1 30 Cycles DELAY RECONNECT 60 Cycles ENTER SETPOINT SELECT FUNCTION ENTER SETPOINT SELECT FUNCTION ENTER SETPOINT SELECT FUNCTION ENTER SETPOINT SELECT FUNCTION Rotate knob Rotate knob Rotate knob EXIT ...

Page 88: ...ON ENTER SETPOINT ENTER SETPOINT SELECT FUNCTION ENTER SETPOINT SELECT FUNCTION ENTER SETPOINT SELECT FUNCTION ENTER EXIT EXIT EXIT CONFIGURE RELAYS setpts stat CONFII CONFIGURE RELAY CURRENT_RELAY VC DELTA Y TRANSFORM DISABLE enable PHASE DIRECTIONAL OVRCUR DISABLE enable high spd ENTER A B ENTER ENTER ENTER ENTER directional ENTER Path if function disabled Rotate knob to make selection Rotate kn...

Page 89: ...ER SETPOINT SELECT FUNCTION EXIT NUTRL INST OVERCURRENT DISABLE enable ENTER SETPOINT SELECT FUNCTION EXIT NEUTRAL TIME OVERCURRENT DISABLE enable ENTER SETPOINT SELECT FUNCTION EXIT PHASE INST OVERCURRENT DISABLE enable Use Arrow Keys to Select Option ENTER Use Arrow Keys to Select Option ENTER Use Arrow Keys to Select Option ENTER Use Arrow Keys to Select Option ENTER ...

Page 90: ... or disable blocking SELECT FUNCTION ENTER SETPOINT CONFIGURE RELAYS setpts stat CONFIG SELECT FUNCTION ENTER SETPOINT CONFIGURE V T FUSE LOSS trip FUSE INTERNAL FUSE LOSS LOGIC disable ENABLE SELECT FUNCTION ENTER SETPOINT BLOCK PHASE UNDERVOLTAGE disable ENABLE SELECT FUNCTION ENTER SETPOINT BLOCK REVERSE POWER DISABLE enable SELECT FUNCTION ENTER SETPOINT BLOCK TIME OVERCURRENT disable ENABLE S...

Page 91: ... 08 28 91 10 19 12 TIMER TARGETS AT TRIP TRGT_0 06 22 93 10 19 12 TIMER TARGETS TRGT_0 06 22 93 10 19 12 PHASE UNDERVOLTAGE 1 TRGT_0 06 22 93 10 19 12 PHASE A X B X C X TRGT_0 06 22 93 10 19 12 PHASE UNDERVOLTAGE 1 TRGT_0 06 22 93 10 19 12 PHASE A X B X C X TRIP_0 08 28 91 10 19 12 TIMER TARGETS AT TRIP TRGT_0 06 22 93 10 19 12 STATUS TARGETS ...

Page 92: ...M 0420 Instruction Book 5 28 This Page Left Intentionally Blank ...

Page 93: ...l power supply label and as shown in Figure 6 5 External Connections 2 As described in Chapter 4 Operation the relay performs a power on self test routine and ends by cycling through a display of all of the functions that are tripped Assuming that various voltage functions are enabled and that there are no test voltage inputs con nected you will see various voltage targets identified as having tri...

Page 94: ...e is no need to recalibrate the unit before initial installation Further calibration is only necessary if a component was changed during a repair procedure and will be only as accurate as the test equipment used 6 Set the internal configuration DIP switches according to your application Refer to the DIP Switches section following for more information on the location of the DIP switches and for a d...

Page 95: ...re all present check the polarities of the VT connections and change connections to obtain proper polarities 8 Press EXIT until the unit displays MONITOR VOLTAGE STATUS VOLT freq curr powr C 9 Turn the rotary knob clockwise until the unit displays MONITOR CURRENT STATUS volt freq CURR powr C 10 Display line currents IA IB IC Press ENTER The unit should display PHASE CURRENT AMPS A 0 0 B 0 0 C 0 0 ...

Page 96: ... t a i t i n i e s a h p e n o r o B P r o A P n o i t a r e p o t n i o p t e s C P t s u m r e w o p e s a h p 3 l a t o t e h T r o f n o i t c e r i d e s r e v e r e h t n i e b B P A P n o i t a i t i n i y a l e r t n i o p t e s C P t n e r r u C l a n o i t c e r i D Ia I r o b I r o c t n i o p t e s Ia I b I d n a c t n i o p t e s 5 s t u p n I T V c i s a B e n i L o t e n i L d n u o...

Page 97: ...cy component only VT inputs line to ground 1 2 3 4 8 7 6 5 4 3 2 1 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 ON OFF NOTES 59N and 27N functions respond to fundamental frequency component of input waveform only regardless of the position of switch 8 When 69 3 V is chosen for the VT secondary voltage 69 3 V is internally converted to 120 V 1 pu for all calculations and for setting and display options ...

Page 98: ...Dimensions for these mounting configurations are provided in Figures 6 2 and 6 3 NOTE If this is a new installation choose either mounting configuration and prepare the panel accordingly 0 64 1 9 15 6 Inches Centimeters 52 8 19 4 3 4 6 1 8 1 4 Diameter 19 8 7 25 32 20 25 32 7 5 8 19 8 7 25 32 7 2 2 7 8 7 2 2 7 8 7 8 3 1 16 7 8 3 1 16 22 7 8 15 16 22 7 8 15 16 Max Depth 35 9 14 1 8 M 0420 Case Beze...

Page 99: ...8 14 1 2 6 1 1 32 5 9 16 0 64 1 4 Diameter 23 5 9 1 4 23 5 9 1 4 19 4 7 5 8 52 8 20 25 32 7 2 2 7 8 7 2 2 7 8 8 15 16 22 7 8 15 16 22 7 Max Depth 35 9 14 1 8 Front View M 0420 Case Bezel Figure 6 3 Mounting Dimensions for Westinghouse FT 41 Cabinet ...

Page 100: ... 11 4 4 1 2 Approx Inches Centimeters Approx 45 4 177 8 5 72 2 53 0 995 2 25 6 4 1 79 0 651 1 65 C O M 2 53 7 211 8 Approx NOTE Approximately 2 5 clearance is required when a right angle connector is used for the rear RS 232C port Figure 6 4 M 0420 Side View ...

Page 101: ...tral Current Input Phase Current Inputs Phase Voltage Inputs Neutral Voltage Input Power Input 52b C37 90 Relay Output V T Fuse Loss Relay Output Trip Annunciate 60 F L INPUT 60 N A B C N A B C I I I I V V V V C O M 2 SELF TEST ALARM PWR OK STA TRIP RECON ENABLE COM EXT VOLT PWR PWR Chassis Ground POWER SUPPLY INPUT VOLTAGE 120V AC 125V DC 48V DC 24V DC 52b Breaker Status Input VT FUSE LOSS TRIP A...

Page 102: ...A B C VCA VBC VAB NOTE On the internal configuration DIP switch select line to line for basic VT input and either 69 3 V ac or 120 V ac for VT secondary voltage Figure 6 8 Connections for Delta Wye Connected VTs 6 6 UL LISTED TERMINAL BLOCK CONNECTIONS Serial Numbers 145 and above are listed to UL Standards for Safety by Underwriters Laborato ries Inc UL To fulfill the UL requirements ter minal bl...

Page 103: ...libration is needed since the unit is cali brated and fully tested at the factory If calibra tion is necessary because of a component replacement follow the self calibration procedure detailed at the end of this chapter These test procedures are based on the prerequisite that the functions are enabled and have initial set tings as shown in Table 7 1 Initial Settings the default as shipped configur...

Page 104: ...d 7 4 Test and Equipment Setup 1 Connect system power to the power input terminals 54 hot and 55 neutral The re lay can be ordered with a nominal input power supply of 120 V ac 125 V dc 48 V dc or 24 V dc NOTE The proper power for your relay is clearly marked on the power supply label affixed to the rear panel 2 Connect the voltage and current inputs ac cording to the configurations shown in Fig u...

Page 105: ... e V g n i t t e S p a T A 0 6 g n i t t e S l a i D e m i T 5 l o r t n o C e g a t l o V d e l b a s i D t n i a r t s e R e g a t l o V d e l b a s i D m r o f s n a r T Y a t l e D d e l b a s i D N 1 5 l a r t u e N t n e r r u c r e v O e m i T e s r e v n I e v r u C c i t s i r e t c a r a h C e s r e v n I y r e V g n i t t e S p a T A 0 6 g n i t t e S l a i D e m i T 5 6 4 t n e r r u c...

Page 106: ...tage Input Configuration Figure 7 2 Current Input Configuration NOTE The phase angles shown here use leading angles as positive and lagging angles as negative Some manufacturers of test equipment have used lagging angles as positive in which case VB 120 VacI120 and VC 120 VacI240 IN ICÐ120 IBÐ 120 or IBÐ240 IAÐ0 5 6 7 8 9 10 11 12 Current Input 3 Polarity IINPUT IINPUT IINPUT Current Input 2 Curre...

Page 107: ... press any button except TARGET RE SET LAMP TEST Output Test The OUTPUT TEST menu selection enables you to check the individual relay outputs Individual relay outputs can be selected by relay number using the rotary knob The selected output can then be turned on or off using the left and right arrow buttons y a l e R r e b m u N e m a N y a l e R n e p O y l l a m r o N t c a t n o C y l l a m r o...

Page 108: ... 3 through 9 for relay 2 and the remainder of the relays being used When finished press EXIT twice to return to the DIAGNOSTIC MODE main menu NOTE Relays 7 and 8 are not currently used Input Test The INPUT TEST menu selection enables you to determine the status of the individual status in puts Individual inputs can be selected by input number using the rotary knob The status of the input will then...

Page 109: ...r u d e m a n y b o t d e r r e f e r e r a s D E L e h T e r u d e c o r p t s e t r e w o P n o e b d l u o h s D E L e h T t i n u e h t o t d e i l p p a s i r e w o p n e h w y l s u o u n i t n o c K O y a l e R s a y l s u o n i t n o c t i l y a t s r o h s a l f d l u o h s D E L e h t n i d e m m a r g o r p t i n U p u t e S s i r e w o p n e h w u n e m t i n u e h t o t d e i l p p a ...

Page 110: ... the test has cycled through completely press EXIT twice to return to the DIAGNOSTIC MODE main menu END Backlight Test The BACKLIGHT TEST menu selection enables you to check the LCD backlight by turning it on and off under manual control The backlight will be turned on for normal operation regardless of whether it is turned on or off when the DIAGNOSTIC MODE main menu is exited 1 Turn the rotary k...

Page 111: ...when com plete the unit should display COM1 TEST PASS 5 Press ENTER to return to the DIAGNOSTIC MODE main menu END COM2 Test The COM2 TEST menu selection enables you to check the rear panel RS 232C port A loopback plug is required for this test NOTE The loopback plug required for COM2 consists of a DB25P connector male with pin 2 TX connected to pin 3 RX and pin 4 RTS connected to pin 5 CTS No oth...

Page 112: ...n to the DIAGNOSTIC MODE main menu END Initialize Setpoints The INITIALIZE SETPOINTS menu selection enables you to reset all setpoints to their initial settings as defined in Chapter 2 Application and the Specifications at the front of this book NOTE This selection will also reset all access codes 1 Turn the rotary knob until the unit displays INITIALIZE SETPOINTS B bbram clock INIT C 2 Press ENTE...

Page 113: ...sts ends with the system date and time and the default logo and then presents the default message screens These are the target history screens when a trip has occurred which will have occurred if the voltage and frequency relays are enabled but there is no input voltage 7 The display should cycle through the target history screens as in the following exam ple Cycles continously through screens TRG...

Page 114: ...LTAGE 1 TRGT 06 22 93 10 19 12 PHASE A X B C 11 Return the test input voltage to 120 V ac 12 Press TARGET RESET LAMP TEST 59 OVERVOLTAGE LED should turn off The unit should display BECKWITH ELECTRIC CO M 0420 Magnitude Accuracy Test Test Settings Magnitude 1 126 V 1 05 pu Time Delay 1 1 cycle 1 Press ENTER SELECT FUNCTION LED should turn on and the unit should display VOLTAGE RELAY VOLT freq curr ...

Page 115: ...il the unit displays BECKWITH ELECTRIC CO M 0420 59 RMS OVERVOLTAGE 3 PHASE CONT 18 Replace the ohmmeter connection to the trip relay output with a connection to the timer stop function 19 Create a step increase in input voltage to 130 V ac and start timing 20 The unit should trip after 300 cycles 1 cycle time delay If using a conventional electronic timer 300 cycles is the same as 5 000 ms at 16 ...

Page 116: ...T RESET LAMP TEST The 59 N OVERVOLTAGE LED should turn off The unit should display BECKWITH ELECTRIC CO M 0420 Magnitude Accuracy Test Test Settings Magnitude 1 150 V 1 25 pu Time Delay 1 1 cycle Functions 59 59I Disable 1 Press ENTER The SELECT FUNCTION LED should turn on and the unit should display VOLTAGE RELAY VOLT freq curr powr C 2 Press ENTER The unit should display OVERVOLTAGE SETPOINTS PH...

Page 117: ...to be mea sured when the voltage steps above the setpoint The unit should display DELAY NEUTRAL OVERVOLT 1 5 Cycles 16 Press ENTER once and then EXIT until the unit displays BECKWITH ELECTRIC CO M 0420 17 Create a step increase in input voltage to 155 V ac and start timing 18 The unit should trip after 5 cycles 1 cycle time delay 19 The 59 N OVERVOLTAGE LED should turn on and the unit should rotat...

Page 118: ...e input voltage to 120 V 9 Press TARGET RESET LAMP TEST The 59 OVERVOLTAGE LED should turn off The unit should display BECKWITH ELECTRIC CO M 0420 Magnitude Accuracy Test Test Settings Magnitude 1 1 10pu 132 V rms for a sinusodial input Time Delay 1 1 cycle Function 59 Disable 1 Press ENTER The SELECT FUNCTION LED should turn on and the unit should display VOLTAGE RELAY VOLT freq curr powr C 2 Pre...

Page 119: ...nob counterclockwise to 5 cycles The unit should display DELAY PEAK OVERVOLT 1 5 Cycles 14 Press ENTER once and then EXIT until the unit displays BECKWITH ELECTRIC CO M 0420 15 Increase the input voltage on Phase A to 136 V ac and start timing The unit should trip after 5 cycles 1 cycle time delay 16 The 59 OVERVOLTAGE LED should turn on and the unit should rotate displays TRGT 06 22 93 10 19 12 T...

Page 120: ... RESET LAMP TEST The 27 UNDERVOLTAGE LED should turn off The unit should display BECKWITH ELECTRIC CO M 0420 Magnitude Accuracy Test Test Settings Magnitude 1 108 V 0 90 pu Time Delay 1 1 cycle 1 Press ENTER The SELECT FUNCTION LED should turn on and the unit should display VOLTAGE RELAY VOLT freq curr powr C 2 Press ENTER The unit should display OVERVOLTAGE SETPOINTS PHASE_OVER phase_under C 3 Tu...

Page 121: ... the setpoint by rotating the knob clockwise to 300 cycles The unit should display DELAY PHASE UNDERVOLT 1 300 Cycles 16 Press ENTER once and then EXIT until the unit displays BECKWITH ELECTRIC CO M 0420 17 Decrease the test voltage input on Phase A to 107 V ac and start timing The unit should trip after 300 cycles 1 cycle time delay 18 The 27 UNDERVOLTAGE LED should turn on and the unit should ro...

Page 122: ...Set the input voltage to 120 V 10 Press TARGET RESET LAMP TEST The 27N UNDERVOLTAGE LED should turn off The unit should display the default logo con tinuously or else briefly and then go blank in accordance with the display setup con figuration BECKWITH ELECTRIC CO M 0420 Magnitude Accuracy Test Test Settings Magnitude 1 60 V 0 50 pu Time Delay 1 1 cycle Function 27 Disable 1 Press ENTER The SELEC...

Page 123: ...30 Cycles 15 Change the setpoint by rotating the knob counterclockwise to 5 cycles The unit should display DELAY NEUTRAL UNDERVOLT 1 5 Cycles 16 Press ENTER once and then EXIT until the unit displays BECKWITH ELECTRIC CO M 0420 17 Decrease the test voltage input to 55 V ac and start timing The unit should trip after 5 cycles 1 cycle time delay 18 The 27N UNDERVOLTAGE LED should turn on and the uni...

Page 124: ...e C by following steps 9 through 15 above Having the neutral in series with Phase C will not affect the VT fuse loss function However the unit will trip on neutral under voltage when the source voltage is removed END 1 Apply three phase voltages as shown in Figure 7 1 2 Set input current to 5 00 A with phase an gles as shown in Figure 7 2 3 Press ENTER The SELECT FUNCTION LED should turn on and th...

Page 125: ...60 00 Hz 16 Press TARGET RESET LAMP TEST The 81 OVERFREQUENCY LED should turn off The unit should display BECKWITH ELECTRIC CO M 0420 END Magnitude Accuracy Test Test Settings Magnitude 1 60 50 Hz Time Delay 1 2 cycles 1 Press ENTER The SELECT FUNCTION LED should turn on and the unit should display VOLTAGE RELAY VOLT freq curr powr C 2 Turn the knob clockwise to highlight FREQ Press ENTER until th...

Page 126: ...he 81 UNDERFREQUENCY LED should turn off The unit should display BECKWITH ELECTRIC CO M 0420 END Magnitude Accuracy Test Test Settings Magnitude 1 59 50 Hz Time Delay 1 2 cycles 1 Press ENTER The SELECT FUNCTION LED should turn on and the unit should display VOLTAGE RELAY VOLT freq curr powr C 2 Turn the knob clockwise to highlight FREQ Press ENTER and then the right arrow button and then ENTER un...

Page 127: ... 00 A 13 Press TARGET RESET LAMP TEST The 50 INSTANTANEOUS OVERCURRENT LED should turn off The unit should display BECKWITH ELECTRIC CO M 0420 END Magnitude Accuracy Test TEST SETTINGS Magnitude 1 9 A Function 46 Disable Function 51 Disable 1 Press ENTER The SELECT FUNCTION LED should turn on and the unit should display VOLTAGE RELAY VOLT freq curr powr C 2 Turn the knob clockwise to highlight CUR...

Page 128: ...il the unit displays OVERCURRENT SETPOINTS phase_over NTRL_OVERC 7 Press ENTER until the unit displays NUTRL INST OVERCURRENT 10 0 Amps The ENTER SETPOINT LED should be on 8 Turn the knob counterclockwise until the unit displays NUTRL INST OVERCURRENT 9 0 Amps 9 Press ENTER once and then EXIT until the unit displays BECKWITH ELECTRIC CO M 0420 10 Slowly increase the current on Phase C and neutral ...

Page 129: ...50 A The unit should trip instantaneously 2 cycles 15 50N INSTANTANEOUS OVERCURRENT LED should turn on and the unit should rotate displays TRGT 06 22 93 10 19 12 Trip 17 TRGT 06 22 93 10 19 12 NUTRL INST OVERCURRENT 16 Reduce the current to 0 00 A 17 Press TARGET RESET LAMP TEST The 50 N INSTANTANEOUS OVERCURRENT LED should turn off The unit should display BECKWITH ELECTRIC CO M 0420 END ...

Page 130: ...unterclockwise until the unit displays TAP PHASE OVERCURRENT 1 0 Amps 6 Press ENTER once and EXIT until the unit displays BECKWITH ELECTRIC CO M 0420 7 Set the input current on Phase A to just below 1 00 A then rapidly increase it to 2 00 A and start timing NOTE Commercial test equipment may have a jump initiate function that could be used to create a step function to a specific value 8 The unit s...

Page 131: ...00 A 21 Press TARGET RESET LAMP TEST The 51 67 OVERCURRENT LED should turn off The unit should display BECKWITH ELECTRIC CO M 0420 END Time Delay Accuracy Test Phase B TEST SETTINGS Characteristic Curve Very Inverse Tapsetting 1 A Time Dial Setting 5 0 Voltage Control Disable Voltage Restraint Disable Delta Wye Transform Disable 12 Set the input current on Phase B to just below 1 00 A then rapidly...

Page 132: ...he knob counterclockwise until the unit displays TAP PHASE OVERCURRENT 1 0 Amps 6 Press ENTER once and EXIT until the unit displays VOLTAGE RELAY VOLT freq curr powr C 7 Turn the knob clockwise until the unit displays CONFIGURE RELAYS Bsetpts stat CONFIG C 8 Press ENTER The unit should display CONFIGURE RELAYS VOLTAGE_RELAY C 9 Press ENTER The unit should display PHASE OVERVOLTAGE 1 disable ENABLE...

Page 133: ... 2 00 A on all phases 20 Decrease the input voltage to 131 volts on all phases and start timing 21 The unit should trip within the range 7 14 to 7 59 seconds time delay 22 The 51 67 OVERCURRENT LED should turn on and the unit should rotate displays TRGT 06 22 93 10 19 12 Trip 23 TRGT 06 22 93 10 19 12 PHASE TIME OVERCURRENT TRGT 06 22 93 10 19 12 PHASE A X B C 23 Set the input current to 0 00 A 24...

Page 134: ...nv einv 7 Turn the knob clockwise until the unit displays TIMING PHASE OVERCURRENT def inv VINV einv 8 Press ENTER The unit should display TIME DIAL PHASE OVERCURR 5 0 9 If the display does not default to 5 0 turn the knob clockwise or counterclockwise until the display shows 5 0 10 Press ENTER once and EXIT until the unit displays BECKWITH ELECTRIC CO M 0420 11 Press ENTER The SELECT FUNCTION LED...

Page 135: ... 06 22 93 10 19 12 PHASE A X B X C X 27 Set the input current to 0 00 A 28 Press TARGET RESET LAMP TEST The 51 67 OVERCURRENT LED should turn off The unit should display BECKWITH ELECTRIC CO M 0420 29 Set the input voltage to 60 volts VA VB and VC This changes the 51 V tap set ting to 0 50 A 30 Increase the input current to 1 00 A and start timing 31 The unit should trip at 7 36 5 seconds time del...

Page 136: ...VER nutrl_overC 7 Turn the knob clockwise until the unit displays OVERCURRENT SETPOINTS phase_over NUTRL_OVERC 8 Press ENTER The unit should display TAP NEUTRAL OVERCURRENT 6 0 Amps The ENTER SETPOINT LED should be on 9 Turn the knob counterclockwise until the unit displays TAP NEUTRAL OVERCURRENT 1 0 Amps 10 Press ENTER once and EXIT until the unit displays BECKWITH ELECTRIC CO M 0420 11 Set the ...

Page 137: ...ntil the unit displays BECKWITH ELECTRIC CO M 0420 9 Timing Accuracy Calculations s n o i t a l u c l a C y c a r u c c A g n i m i T g n i t t e s p a T A 5 p u k c i P 0 5 k l a i D e m i T 5 2 m u m i x a M e t i n i f e D p i r T o t e m i T s e l c y c 0 0 0 0 1 c e s 7 6 6 6 1 I2 10 A I2 I2 Tapsetting 10 5 2 where I2 Negative Sequence Current in multiples of the tap setting K I2 2 t t k I2 2...

Page 138: ...LE nondirectionalC 7 Press ENTER once The unit should display PHASE DIRECTIONAL OVRCUR DISABLE enable high_spd 8 Turn the knob clockwise until the unit displays PHASE DIRECTIONAL OVRCUR disable ENABLE high_spd 9 Press ENTER once and EXIT until the unit displays CONFIGURE RELAYS Bsetpts stat CONFIG C 10 Turn the knob counterclockwise until the unit displays CURRENT RELAY volt freq curr powr C 11 Pr...

Page 139: ...it should display BECKWITH ELECTRIC CO M 0420 24 Set the phase angle between the voltage and current inputs to 180 VA 120Vac 0 VB 120Vac 240 VC 120Vac 120 IA 6A 180 IB 6A 60 IC 6A 300 The unit should now be in the blocking direction and should not trip 25 Set the phase angle between the voltage and current inputs to 45 and start timing The unit should trip after 30 cycles time delay 26 The 51 67 O...

Page 140: ...terclockwise until the unit displays DELAY FORWARD POWER 1 Cycle 5 Press ENTER once and then EXIT until the unit displays BECKWITH ELECTRIC CO M 0420 6 Slowly increase the input current until the relay trips The unit should trip at 15A 0 1A 7 The 32 DIRECTIONAL OVERPOWER LED should turn on and the unit should rotate displays TRGT 06 22 93 10 19 12 Trip 29 TRGT 06 22 93 10 19 12 FORWARD OVERPOWER 8...

Page 141: ...l the unit displays DELAY FORWARD POWER 30 Cycles 14 Press ENTER once and then EXIT until the unit displays BECKWITH ELECTRIC CO M 0420 15 Increase the input current to 16 00 A and start timing The unit should trip after 30 cycles time delay 16 The 32 DIRECTIONAL OVERPOWER LED should turn on and the unit should rotate displays TRGT 06 22 93 10 19 12 Trip 30 TRGT 06 22 93 10 19 12 FORWARD OVERPOWER...

Page 142: ...e knob counterclockwise until the unit displays DELAY REVERSE POWER 1 Cycle 7 Press ENTER once and then EXIT until the unit displays BECKWITH ELECTRIC CO M 0420 8 Set the phase angle between the voltage and current inputs to 180 VA 120VacI0 VB 120VacI240 VC 120VacI120 IA 2AI180 IB 2AI60 IC 2AI300 9 Slowly increase the input current until the relay trips The unit should trip at 15 00 A 0 10 A 10 Th...

Page 143: ...R until the unit displays DELAY REVERSE POWER 1 Cycle 18 Turn the knob clockwise until the unit displays DELAY REVERSE POWER 30 Cycles 19 Press ENTER once and then EXIT until the unit displays BECKWITH ELECTRIC CO M 0420 20 Increase the input current to 16 00 A and start timing The unit should trip after 30 cycles time delay 21 The 32 DIRECTIONAL OVERPOWER LED should turn on and the unit should ro...

Page 144: ... read 0 0000 Ω 2 Increase the input voltage to 132 V 3 The unit should trip after 30 cycles 1 cy cle time delay 4 The reconnect contacts should open The Digital Multimeter DMM reading should in dicate open contacts 5 Decrease the input voltage to 120 V and start timing 6 The reconnect contacts should close after 60 cycles 1 cycle time delay The ohm meter should read 0 0000 Ω END 79 RECONNECT TIME ...

Page 145: ... the case and verify that the unit assembly is secured properly to the housing 4 Connect and configure the voltage inputs VA VB VC and VN according to Figure 7 3 Hot Neutral Voltage Input VC or VC A VN 13 14 15 16 17 18 19 20 VB or VB C VA or VA B Figure 7 3 Single Phase Voltage Input Configuration for Calibration 5 Connect and configure the current inputs IA IB IC and IN according to Figure 7 4 I...

Page 146: ...ge and current and the system power 8 Pull the unit from its case 9 Set DIP switch 2 to ON down and verify that the other switches are in the correct positions for your application 10 Put the unit back in its case and make sure that the connections are seated properly 11 Apply system power and the test voltage and current 12 After the power on self test has finished verify the following readings u...

Page 147: ...by customers can obtain information concerning all design changes to our units Full documentation on each unit is kept on file by model number serial number and software version if applicable Each unit has a model number consisting of a letter and four numbers Significant enhancements are marked with a suffix letter The rule is that it must be possible to use any later version as a replacement for...

Page 148: ...V 67 and 32R functions added Auto rearming option for fault recorder added D 0020V04 01 32 ECO 955 Power factor now displayed as an absolute value no sign shown TARGET LEDs cannot be reset until all out of bound conditions are OK Review setpoints screens now scroll only forward RELAY OK LED can be programmed to flash or remain on continuously Date and time stamp of last power up added Fault record...

Page 149: ...or many analog components would not be a factor in the new relay The approach followed in this project replaces the entire analog signal processing hardware with a Digital Signal Processor DSP If the relay were designed with an analog front end it would require analog circuitry for each channel to cal culate the magnitude and phase angle and other analog circuits for the calculation of negative se...

Page 150: ...p command The voltage and current signals are scaled and isolated using voltage transformers VT and cur rent transformers CT These isolated analog sig nals must be filtered to remove unwanted harmonic content above 480 Hz to accommodate a 960 Hz sampling rate according to the Nyquist criterion to avoid aliasing or the incorrect interpretation of frequency components by the system Anti aliasing low...

Page 151: ...stem voltage can be adversely affected by harmonic distortion and noise which can shift the zero crossings or create multiple zero crossings The algorithm used in the M 0420 Multifunction Relay uses voltage phasor estimates obtained from the DFT to compute the frequency This algorithm not only provides very reliable frequency estimates but since the DFT rejects dc and harmonic components in the si...

Page 152: ...orm This operation can be used to correct sampling delays in a multi channel data acquisition system when the sequential sampling technique is used with a single sample and hold circuit When n signals are sampled sequentially with a delay of T seconds between successive channels the phasor estimated at the nth channel should be rotated by an angle n 1 θ n 1 ω0 T to correct the phase delay introduc...

Page 153: ...have been proposed in the relaying literature 4 The algorithm based on the DFT 5 is very attractive for implementation and it provides very reliable frequency estimates This algorithm uses voltage phasor estimates obtained from the DFT to compute the frequen cy Since the DFT rejects dc and harmonic com ponents in the signal the frequency estimates are not affected by these components It was noted ...

Page 154: ...ative sequence current is used to detect unbalances and open phases Let Va Vb and Vc be the estimated phasors of the three phase voltages Then the positive V1 negative V2 and zero sequence V0 components of the three phase voltages are given by v0 v1 v2 1 α α2 1 α2 α 1 1 1 1 3 va vb vc 15 where phasor V Vr jVi and α 0 5 j0 866 or 1 I120 Calculation of Power Power Factor Computation of complex power...

Page 155: ...ƒ is a weighted least squares approxima tion of ƒ and A0 A1 and A2 are the polynomial coefficients The variable in the approximating function is selected as I 2 instead of I to avoid the square root computation A 4 Acknowledgements Beckwith Electric Company is pleased to ac knowledge the financial support of the Gas Re search Institute Consolidated Edison Company of New York and Rochester Gas and ...

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Page 157: ...I l i a f t p u r r e t n i d e e p s h g i H 3 1 e d i s P S D l i a f M A R t r o p l a u D 4 1 l i a f g n i m i t D A 5 1 n o i s r e v e r a w t f o s P S D e l b i t a p m o c n I 6 1 s t u p n i e l b a t a r b i l a c n U 7 1 P S D r o f d e v r e s e r 8 1 P S D r o f d e v r e s e r 9 1 P S D r o f d e v r e s e r 0 2 0 M O R P E E d e z i l a i t i n i n U 1 2 1 M O R P E E d e z i l a ...

Page 158: ...o c e r n U 5 3 t p u r r e t n i t s o h d e t n e m e l p m i n U 6 3 t r a t s e r t s o h d e t n e m e l p m i n U 7 3 p a r t e d o c p o t s o h d e t n e m e l p m i n U 8 3 r o r r e n r u t e r g n i t u o r n i a M 9 3 o r e z y b e d i v i d r o t o o r e r a u q s r o r r e h t a M 0 4 y r e t t a b k c o l c w o l G N I N R A W 1 4 l i a f M A R k c o l c e t i r W d a e R 2 4 e d i ...

Page 159: ... o r g e s a h P 4 5 l i a f 8 n i a g e c n e r e f e r d n u o r g l a r t u e N 5 5 l i a f e c n e r e f e r y l p p u s e v i t i s o P 6 5 l i a f 1 n i a g e c n e r e f e r y l p p u s e v i t a g e N 7 5 l i a f 2 n i a g e c n e r e f e r y l p p u s e v i t a g e N 8 5 l i a f 4 n i a g e c n e r e f e r y l p p u s e v i t a g e N 9 5 l i a f 8 n i a g e c n e r e f e r y l p p u s e v...

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Page 161: ...t data Reconfiguration of relay functions C 3 Communication Ports The relay has both front and rear panel RS 232 ports The front panel connector is a 9 pin DB9S connector configured as DTE Data Terminal Equipment per the RS 232C standard The rear panel connector is a 25 pin DB25S connector also configured as DTE Signals are defined as shown in Table C 1 NOTE The RS 232C standard specifies a com bi...

Page 162: ...al Equipment some form of null modem cable is usually required Pin outs for these cables are provided in Figures C 1 and C 2 These cables are available from Beckwith Electric or can be fabricated or purchased from most computer supply houses The baud rate and parity settings must match the settings of the relay The relay always communicates with 8 data bits 1 stop bit and either even or no parity ...

Page 163: ...C 3 Communications Appendix C Figure C 1 Null Modem Cable M 0420 COM1 to PC 9 pin Figure C 2 Null Modem Cable M 0420 COM2 to PC 25 pin ...

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Page 165: ...D 1 Board Interconnections Appendix D D Board Interconnections Figure D 1 M 0420 Board Interconnections ...

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Page 167: ...uration Record forms allow you to record the specific values entered for each enabled setpoint or function Disabled func tions will have no visible setpoint configuration windows Examples of the suggested use of these forms are provided below Finally an Internal DIP Switch Configuration Record form is provided for noting the settings of the inter nal configuration DIP switches PHASE OVERVOLTAGE 1 ...

Page 168: ...able enable PHASE DIRECTIONAL OVRCUR disable enable high_spd PHASE INST OVERCURRENT disable enable NEUTRAL TIME OVERCURRENT disable enable NEUTRAL INST OVERCURRENT disable enable NEG SEQ TIME OVERCURRENT disable enable CONFIGURE RELAY B POWER_RELAY C FORWARD OVERPOWER disable enable REVERSE OVERPOWER disable enable high_spd CONFIGURE TRIP CIRCUIT B TRIP fuse TRIP CIRCUIT intertie generator CONFIGU...

Page 169: ...RAL OVERVOLTAGE 1 ________ Volts PU DELAY NEUTRL OVERVOLT 1 ________ Cycles NEUTRAL OVERVOLTAGE 2 ________ Volts PU DELAY NEUTRL UNDERVOLT 2 ________ Cycles UNDERVOLTAGE SETPOINTS B nutrl_over NUTRL_UNDER NEUTRAL UNDERVOLTAGE 1 ________ Volts PU DELAY NEUTRL UNDERVOLT 1 ________ Cycles NEUTRAL UNDERVOLTAGE 2 ________ Volts PU DELAY NUTRL UNDERVOLT 2 ________ Cycles Figure E 2 Voltage Relay Setpoin...

Page 170: ...CY 2 ________ Hz DELAY OVERFREQUENCY 2 ________ Cycles UNDERFREQUENCY SETPOINTS over UNDER UNDERFREQUENCY 1 ________ Hz DELAY UNDERFREQUENCY 1 ________ Cycles UNDERFREQUENCY 2 ________ Hz DELAY UNDERFREQUENCY ________ Cycles Figure E 3 Frequency Relay Setpoint Configuration Record FREQUENCY RELAY volt FREQ curr powr C By Date Serial Number Location ...

Page 171: ... phase_over NTRL_OVER C TAP NEUTRAL OVERCURRENT ________ Amps TIMING NUTRL OVERCURRENT def in VINV einv TIME DIAL NUTRL OVERCURR ________ NUTRL INST OVERCURRENT ________ Amps Figure E 4 Current Relay Setpoint Configuration Record CURRENT RELAY volt freq CURR powr C By Date Serial Number Location 50N See note concerning 69 3 V VT secondary ratio on Voltage Relay configuration record form Optional 5...

Page 172: ...__ Cycles REVERSE POWER SETPOINTS forward REVERSE REVERSE OVERPOWER ________ PU DELAY REVERSE POWER ________ Cycles Figure E 5 Power and Reconnect Relay Setpoint Configuration Record POWER RELAY volt freq curr POWR C By Date Serial Number Location RECONNECT SETPOINTS RECON DELAY RECONNECT ________ Cycles RECONNECT RELAY B RECON 32R ...

Page 173: ...witch 8 When 69 3 V is chosen for the VT secondary voltage 69 3 V is internally converted to 120 V 1 pu for all calculations and for setting and display purposes If line to line is chosen for the basic VT inputs DIP switch 5 is ON reverse power sensing will respond to total three phase power regardless of the setting of DIP switch 4 If the system frequency selection DIP switch 7 is changed from th...

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