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MSCDN – MP2A Applications Guide

©2010 Siemens Protection Devices Limited

Chapter 5 Page 7 of 7

3 Resistor Open Circuit Protection

3.1 Fault Setting Principles

Open circuit conditions are difficult to detect in shunt connected resistors therefore two identical resistors
are used in parallel on each phase and the resistor current is compared on a phase-by-phase basis. Under
operating conditions if either resistor develops an open circuit then the Overcurrent element operates to
either trip or alarm the situation.

The Overcurrent elements must be set to avoid operation due to resistor and CT tolerances.

The Overcurrent pickup and delay must be chosen to avoid operation under transient overload conditions
that do not threaten the resistors thermal overload characteristics.

3.2 Setting Example

Resistor Characteristics

Value of Resistance per limb

432

Ω

Maximum Tolerance

±

2.5%

Continuous Rating

12 A

CT Characteristics

Ratio 20/1

Variation of resistor secondary current due to resistor tolerance

Min Value 0.975 x 12/20 = 0.585A
Max Value 1.025 x 12/20 = 0.615A

Worst case spill under normal loading conditions = 0.03A

Open Circuit Protection Settings

50 Setting

0.1 A

50 Delay

1 second

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Summary of Contents for 7SG23 MSCDN - MP2A

Page 1: ...Reyrolle Protection Devices 7SG23 MSCDN MP2A Capacitor Unbalance Protection Answers for energy ...

Page 2: ...shall any model or article be reproduced from this document unless Siemens Protection Devices Limited consent While the information and guidance given in this document is believed to be correct no liability shall be accepted for any loss or damage caused by any error or omission whether such error or omission is the result of negligence or any other cause Any and all such liability is disclaimed 2...

Page 3: ... from this document unless Siemens Protection Devices Limited consent While the information and guidance given in this document is believed to be correct no liability shall be accepted for any loss or damage caused by any error or omission whether such error or omission is the result of negligence or any other cause Any and all such liability is disclaimed 2010 Siemens Protection Devices Limited M...

Page 4: ...me Synchronisation 7 4 3 1 IRIG B Time Synchronisation 7 4 3 2 IEC 60870 5 103 Time Synchronisation 7 4 3 3 Real Time Clock Time Synchronisation 7 4 4 Communications 7 4 5 Settings Groups 7 4 6 Password Feature 8 5 User Interface 8 5 1 Liquid Crystal Display 8 5 2 Back light Control 8 5 3 LED Indications 8 5 4 Keypad 8 5 5 Relay Identifier 8 5 6 Settings Mode 9 5 6 1 Settings Adjustment 9 5 6 2 Se...

Page 5: ... of the relay is based upon the Modular II hardware and software platform illustrated in Figure 2 where the required cards plug in from the front after opening the front fascia Modules are interconnected by means of ribbon cable The relay can be supplied in standard Epsilon case size E12 or E16 The Modular II design provides commonality between products and spare parts across a range of protection...

Page 6: ...puts can be programmed to operate as latching relays These latched outputs can be reset by either pressing the TEST RESET button or by sending an appropriate communications command The operation of the contacts can be simply checked by using the Protection Healthy setting on the Output Relay Menu to energise each relay in turn Do not forget to reset this setting back to its correct value The outpu...

Page 7: ...nal status input may also be programmed to inhibit the elements The temperature of the protected equipment is not measured directly Instead thermal overload conditions are detected by calculating the RMS of the current flowing in each phase of the resistor Should the RMS current rise above a defined level the Overload Setting for a defined time the operating time t the system will be tripped to pr...

Page 8: ...Waveform Records The waveform record feature stores analogue and digital information for the current inputs status inputs and output relays and LED s The waveforms are stored with a sampling resolution of 16 samples per cycle The waveform recorder has the ability to store records for the previous four trip operations of the relay These are labelled 1 4 with 1 being the most recent record This howe...

Page 9: ...om a dedicated substation automation system or from Reydisp Evolution Communications Support Software 4 3 3 Real Time Clock Time Synchronisation In the absence of IRIG B and IEC60870 time synchronisation the relay contains a year 2000 compatible real time clock circuit which maintains real time in the absence of DC supply See Note 4 4 Communications Two fibre optic communication ports COM 1 and CO...

Page 10: ... to provide a user friendly method of entering settings and retrieving data from the relay The relay fascia includes a 20 character by 2 line backlit liquid crystal display LCD 32 light emitting diodes LED and 5 push buttons 5 1 Liquid Crystal Display The liquid crystal display is used to present settings instrumentation and fault data in a textual format on a 2 lines by 20 character interface 5 2...

Page 11: ...displayed part of the display will flash to indicate that the setting being displayed can be modified by using the INCREMENT or Ø DECREMENT keys on the facia When the required value of the setting has been established it may be entered into the relay and acted upon by pressing the ENTER key again CANCEL This push button is used when the cover is removed to return the relay display to its initial s...

Page 12: ...f scrolling through the setting values increases If ESCAPE CANCEL is pressed during a setting change operation the original setting value is restored and the display is returned to the normal view mode If changes are made to the setting value then pressing ENTER disables the flashing character mode and displays the new setting value This is immediately stored in non volatile memory The next sectio...

Page 13: ...e screen pressing ENTER and DOWN simultaneously reveals some additional metering for calibration purposes The reference channels as well as DC offsets may be displayed along with the RMS values in raw ADC counts The relationship between current and ADC counts is 1 0 xIn 600 counts 5 8 Fault Data Mode In FAULT DATA MODE the time and date of relay operations are recorded together with a record of th...

Page 14: ...CDN MP2A Description of Operation 6 Diagrams Figure 2 Modular II Relay in E16 case with front panel open Figure 3 Modular II Relay Rear View 2010 Siemens Protection Devices Limited Chapter 1 Page 12 of 13 ...

Page 15: ... READ DOWN TEST RESET ENTER CANCEL ESCAPE MISC METERS PRESS DOWN COMMUNICATIONS MENU Ö TO VIEW LED MENU Ö TO VIEW Output Relays 1 5 1 _ _ _ _ Time Date 16 07 2001 11 49 17 Status Inputs 1 3 _ _ _ CANCEL ESCAPE OUTPUT RELAY MENU Ö TO VIEW DATA STORAGE MENU Ö TO VIEW STATUS INPUT MENU Ö TO VIEW REYLOGIC CONTROL MENU Ö TO VIEW REYLOGIC ELEMENTS MENU Ö TO VIEW THERMAL MENU Ö TO VIEW CT VT CONFIG MENU ...

Page 16: ...ited MSCDN MP2A Capacitor unbalance protection Document Release History This document is issue 2011 10 The list of revisions up to and including this issue is Pre release 2011 10 Reference to 60Hz removed 2010 02 Document reformat due to rebrand 12 10 2004 R9 AC Voltage Input ratings added VT Supervision function added Status input minimum operate current corrected Corrected operating time variati...

Page 17: ...ording 7 3 13 Communications 7 3 14 Irig B Time Synchronisation 8 4 Protection Elements 8 4 1 Common Performance 8 4 2 87 50 x x Overall Differential 8 4 3 C1 2 50 x Capacitor Unbalance 8 4 4 50N Cap Bank Phase Unbalance 8 4 5 R1 2 49 Resistor Thermal Overload 9 4 6 50 Resistor Open Circuit 9 4 7 49 Reactor Thermal Overload 9 4 8 50 Backup Overcurrent 9 4 9 50N Backup Earth Fault 10 4 10 51 Backup...

Page 18: ...ary Supply Nominal Frequency 50 Hz Ambient Temperature 20 C 3 Modular Ii Specification 3 1 Environmental Withstand Temperature IEC 60068 2 1 2 Operating range 10 C to 55 C Storage range 25 C to 70 C Humidity IEC 60068 2 3 Operational test 56 days at 40 C and 95 RH Transient Overvoltage IEC 60255 5 Between all terminals and earth or between any two independent circuits without damage or flashover 5...

Page 19: ...22 5 Variation 4KV Line Earth O C Test voltage 10 2KV Line Line 10 Vibration Sinusoidal IEC 60255 21 1 Class 1 Variation Vibration response 0 5gn 5 Vibration endurance 1 0gn 5 Shock and Bump IEC 60255 21 2 Class 1 Variation Shock response 5 gn 11ms 5 Shock withstand 15 gn 11ms 5 Bump test 10 gn 16ms 5 Seismic IEC 60255 21 3 Class 1 Variation Seismic Response 1gn 5 Mechanical Classification Durabil...

Page 20: ...most functions except Capacitor Unbalance 3 3 1 Thermal Withstand Continuous and Limited Period Overload AC Current Inputs 3 0 x In Continuous 3 5 x In for 10 minutes 4 0 x In for 5 minutes 5 0 x In for 3 minutes 6 0 x In for 2 minutes 250A for 1 second 625A peak for 1 cycle 3 3 2 A C Burden A C Burden 1A tap 0 1 VA 5A tap 0 3 VA NB Burdens are measured at nominal rating 3 4 A C Voltage Inputs The...

Page 21: ...grammable The basic I O module has 3 status inputs additional modules can be added to provide more inputs these inputs are added in groups of eight up to a maximum of 27 A pickup timer is associated with each input and each input may be individually inverted where necessary The pickup timer may be used to provide rejection at power system frequency Nominal Voltage Operating Range 30 34 18V to 37 5...

Page 22: ...stored in Flash EPROM memory 3 12 Recording Up to 5 fault records may be stored within the relay Fault records are accessible via the front panel showing the date and time of trips New faults automatically overwrite the oldest fault record when they occur Waveform records are automatically stored whenever a trip is generated Waveform recording can also be triggered by the status inputs New wavefor...

Page 23: ...ty 2 Transient Overreach 15 Operate Time 1 or 10ms Operating Time Current Applied Typical 2 x setting 1 5 cycle 4 x setting 1 cycle 4 3 C1 2 50 x Capacitor Unbalance Phase segregated Capacitor Unbalance element whose operate quantity is calculated from the ratio of capacitor load current and the measured spill current followed by three identical instantaneous Overcurrent elements with following ti...

Page 24: ...nts on each resistor on a phase by phase basis Accuracy Pickup 100 of setting 5 or 0 02 In Reset 95 of Is Repeatability 2 Operate Time 1 or 10ms Operating Time Current Applied Typical 2 x setting 2 cycles 4 x setting 1 5 cycle 4 7 49 Reactor Thermal Overload Thermal overload element applied to each phase of the reactor independently Accuracy Pickup 100 of setting 5 or 0 02 In Reset 95 of Is Repeat...

Page 25: ...th fault element Accuracy Pickup 100 of setting 5 or 0 02 In Reset 95 of Is Repeatability 2 Operate Time 1 or 10ms Frequency Range 1 st 2 nd 15 th Harmonic Operating Time Current Applied Typical 2 x setting 2 cycles 4 x setting 1 5 cycle 4 10 51 Backup Overcurrent Three phase inverse time overcurrent element Accuracy Pickup 105 of setting 5 or 0 02 In Reset 95 of Is Repeatability 2 Operate Time 5 ...

Page 26: ...ted from B A M t P Is I 1 I fault current Is current setting M time multiplier MI A 0 0515 B 0 114 P 0 02 VI A 19 61 B 0 491 P 2 0 EI A 28 2 B 0 1217 P 2 0 ANSI RESET CURVES Operate times are calculated from 1 2 Is I R M t I fault current Is current setting M time multiplier MI R 4 85 VI R 21 6 EI R 29 1 4 11 51N Derived Earth Fault Inverse time derived earth fault element Accuracy Pickup 105 of s...

Page 27: ...mes are calculated from 1 2 Is I R M t I fault current Is current setting M time multiplier MI R 4 85 VI R 21 6 EI R 29 1 4 12 27 Undervoltage Single phase definite time undervoltage element An under voltage guard element may be used to block this elements operation Accuracy Pickup 100 of setting 0 1 or 0 1 V Reset 100 5 of Vs Adjustable Repeatability 0 1 Operate Time 1 or 20ms Frequency Range 1 s...

Page 28: ...1 20000s 4 15 VT Supervision The VT supervision element operates when the 27 VTS and the 50 VTS element operate to indicate that the capacitor bank is energised but rated voltage has not been applied to the relay on a phase by phase basis 4 15 1 27 VTS Undervoltage Three phase definite time undervoltage element Accuracy Pickup 100 of setting 0 1 or 0 1 V Reset 99 5 of Vs Repeatability 0 1 Operatin...

Page 29: ...or or omission is the result of negligence or any other cause Any and all such liability is disclaimed 2010 Siemens Protection Devices Limited MSCDN MP2A Capacitor unbalance protection Document Release History This document is issue 2010 02 The list of revisions up to and including this issue is Pre release 2010 02 Document reformat due to rebrand 05 02 2003 R5 Status inputs can now reset the Ther...

Page 30: ...rol Menu 5 1 7 Reylogic Element Menu 5 1 8 Output Relay Menu 5 1 9 LED Menu 6 1 10 Data Storage Menu 7 1 11 Communications Menu 7 2 Instruments 8 3 IEC 60870 5 103 Communications Information 9 3 1 IEC 60870 5 103 Semantics in monitor direction 9 3 2 IEC 60870 5 103 Semantics in control direction 11 4 Reylogic Diagrams 12 5 Label Inserts 14 2010 Siemens Protection Devices Limited Chapter 3 Page 2 o...

Page 31: ...is attached to or the relays purpose Up to 16 characters MSCDN MP2A 1 2 CT VT Config Menu Description Range Default Setting R1 Input Selects whether 1 or 5 Amp terminals are being used for resistor 1 1 5 A 1 A R1 CT Ratio Resistor R1 CT ratio to scale primary current instruments 1 0 2 5000 7 2000 1 R2 Input Selects whether 1 or 5 Amp terminals are being used for resistor 2 1 5 A 1 A R2 CT Ratio Re...

Page 32: ...up Delay1 0 000 0 005 864000 s 0 s Aux I P 19 Pickup Delay1 0 000 0 005 864000 s 0 s Aux I P 20 Pickup Delay1 0 000 0 005 864000 s 0 s Aux I P 21 Pickup Delay1 0 000 0 005 864000 s 0 s Aux I P 22 Pickup Delay1 0 000 0 005 864000 s 0 s Aux I P 23 Pickup Delay1 0 000 0 005 864000 s 0 s Aux I P 24 Pickup Delay1 0 000 0 005 864000 s 0 s Aux I P 25 Pickup Delay1 0 000 0 005 864000 s 0 s Aux I P 26 Pick...

Page 33: ...ONE 1 291 NONE General Starter A starter element is picked up NONE 1 291 NONE General Trip An element has operated Useful when testing individual functions NONE 1 291 NONE Trip Circuit Fail A trip circuit has failed look at status input Leds to find out which one NONE 1 291 NONE New Data Stored The waveform recorder has stored new information Note this is a pulsed output NONE 1 291 NONE Aux I P 1 ...

Page 34: ...pacity alarm operated NONE 1 32 5 17 R1 49 Trip Resistor 1 Thermal capacity trip operated NONE 1 32 5 18 R2 49 Alarm Resistor 2 Thermal capacity alarm operated NONE 1 32 6 17 R2 49 Trip Resistor 2 Thermal capacity trip operated NONE 1 32 6 18 R1 50 Resistor 1 Open Circuit DTL Overcurrent operated NONE 1 32 5 19 R2 50 Resistor 1 Open Circuit DTL Overcurrent operated NONE 1 32 6 19 Phase A A phase A...

Page 35: ...54 0 IEC870 On Port Selects which port to use for IEC 60870 5 103 communications None Com1 Com2 Auto Com1 Line Switch Time When IEC870 On Port is selected to Auto the communications ports are scanned for valid IEC 60870 5 103 communications frames Once valid frames are detected the com port will remain selected Subsequently if there are no valid frames received for the Line Switch Time period then...

Page 36: ...ERS press down Start of resistor 2 meters R2 Primary Currents 0 0 0 0 0 0 kA Resistor 2 primary currents R2 Nom Currents 0 00 0 00 0 00 xIn Resistor 2 secondary nominal currents R2 Thermal Status 0 0 0 0 0 0 Resistor 2 thermal status OPEN CCT METERS press down Start of resistor open circuit meters Open Cct Currents 0 00 0 00 0 00 xIn Resistor open circuit nominal currents MISC METERS press down St...

Page 37: ...0 2 Status Input 2 x 1 1 9 70 3 Status Input 3 x 1 1 9 70 4 Status Input 4 x 1 1 9 70 5 Status Input 5 x 1 1 9 70 6 Status Input 6 x 1 1 9 70 7 Status Input 7 x 1 1 9 70 8 Status Input 8 x 1 1 9 70 9 Status Input 9 x 1 1 9 70 10 Status Input 10 x 1 1 9 70 11 Status Input 11 x 1 1 9 70 12 Status Input 12 x 1 1 9 70 13 Status Input 13 x 1 1 9 70 14 Status Input 14 x 1 1 9 70 15 Status Input 15 x 1 1...

Page 38: ...trol Relay 18 x 1 1 9 80 19 Plant Control Relay 19 x 1 1 9 80 20 Plant Control Relay 20 x 1 1 9 80 21 Plant Control Relay 21 x 1 1 9 80 22 Plant Control Relay 22 x 1 1 9 80 23 Plant Control Relay 23 x 1 1 9 80 24 Plant Control Relay 24 x 1 1 9 80 25 Plant Control Relay 25 x 1 1 9 80 26 Plant Control Relay 26 x 1 1 9 80 27 Plant Control Relay 27 x 1 1 9 80 28 Plant Control Relay 28 x 1 1 9 80 29 Pl...

Page 39: ... In 2 1 180 102 Resistor 1 Open Circuit 2 1 180 103 Resistor 2 Open Circuit 2 1 180 104 Resistor 1 Thermal Alarm 2 1 180 105 Resistor 1 Thermal Trip 2 1 180 106 Resistor 2 Thermal Alarm 2 1 180 107 Resistor 2 Thermal Trip 2 1 3 2 IEC 60870 5 103 Semantics in control direction FUN INF Description COM TYP COT 180 0 GI Initiation 7 9 180 0 Time Synchronisation 6 8 180 19 LED reset ON 20 20 ...

Page 40: ...49 Alarm R2_49_Alarm IECEvent Code 180 104 IECEvent Code 180 102 CompA_X _GT_Y CompB_X _GT_Y CompC_X _GT_Y CompA_Y_GT_X CompB_Y_GT_X CompC_Y_GT_X 1 1 R1 50 R1_50_Trip R2 50 R2_50_Trip IECEvent Code 180 103 IECEvent Code 180 105 IECEvent Code 180 106 IECEvent Code 180 107 A50_Operated1 A50_Operated2 A50_Operated3 R1 49 Inhibit A49R1_Inhibit_Input A49R1_Inhibit R2 49 Inhibit A49R2_Inhibit_Input A49R...

Page 41: ...Code 180 64 IECEvent Code 180 65 IECEvent Code 180 66 1 1 A49R1_Trip1 A49R1_Trip2 A49R1_Trip3 A49R1_Alarm1 A49R1_Alarm2 A49R1_Alarm3 A50_Operated1 A50_Operated2 A50_Operated3 A50_Starter1 A50_Starter2 A50_Starter3 1 1 1 A49R2_Alarm1 A49R2_Alarm2 A49R2_Alarm3 A49R2_Trip1 A49R2_Trip2 A49R2_Trip3 1 1 1 PhaseA_Starter PhaseB_Starter PhaseC_Starter PhaseA_Trip PhaseB_Trip PhaseC_Trip PHASESELECTIONLOGI...

Page 42: ...ARTER 49 THERMAL ALARM 17 2 PHASE A 49 THERMAL TRIP 18 3 PHASE B 50 RES OPEN CCT 19 4 PHASE C TRIP CIRCUIT FAIL 20 5 R1 21 6 R2 22 7 23 8 24 9 AUX 1 I P OPERATED AUX 9 I P OPERATED 25 10 AUX 2 I P OPERATED AUX 10 I P OPERATED 26 11 AUX 3 I P OPERATED AUX 11 I P OPERATED 27 12 AUX 4 I P OPERATED 28 13 AUX 5 I P OPERATED 29 14 AUX 6 I P OPERATED 30 15 AUX 7 I P OPERATED 31 16 AUX 8 I P OPERATED 32 ...

Page 43: ...ion Devices Limited consent While the information and guidance given in this document is believed to be correct no liability shall be accepted for any loss or damage caused by any error or omission whether such error or omission is the result of negligence or any other cause Any and all such liability is disclaimed 2010 Siemens Protection Devices Limited MSCDN MP2A Capacitor unbalance protection D...

Page 44: ... 1 Connecting a modem to the relay s 5 4 2 Setting the Remote Modem 6 4 3 Connecting to the remote modem 6 Figures Figure 1 Basic Communications Configuration 7 Figure 2 Basic Communications Configuration Remote 8 Figure 3 Star Type Configuration Using SIGMA 1 Multiplexer 9 Figure 4 Optical Ring Configuration Using SIGMA 4 Fibre RS232 Convertor 9 Figure 5 Direct Control System Data Concentrator Co...

Page 45: ...Station See primary station Modem MOdulator DEModulator device for connecting computer equipment to a telephone line Parity Method of error checking by counting the value of the bits in a sequence and adding a parity bit to make the outcome for example even Parity Bit Bit used for implementing parity checking Sent after the data bits Primary Station The device controlling the communication PSTN Pu...

Page 46: ...tings real time monitoring of measurands and remote control of plant Reydisp Evolution can be configured to connect to the relays using RS232 Fibre Optic Modem or using Ethernet When Ethernet is used the IEC 60870 5 103 protocol is transported using the TCP IP protocol suite across a Local or Wide Area Network LAN WAN 3 Connection Specification And Relay Settings This section defines the connectio...

Page 47: ...interfaces for up to 29 relays It has a fibre optic port to the control system and multiple relay connections Each of the 30 fibre optic ports can be configured for either Light ON or Light OFF operation Default for all is OFF 3 6 Parity Setting IEC60870 5 103 defines the method of transmission as using EVEN Parity However in some instances an alternative may be required This option allows the par...

Page 48: ...and parity to be the same as the settings on the relay and number of data bits to be 8 and stop bits 1 Note although it may be possible to communicate with the modem at e g 19200bps it may not be possible to transmit at this rate over the telephone system which may be limited to 14400 A baud rate setting needs to be chosen which is compatible with the telephone system As 14400 is not available in ...

Page 49: ...set to OFF In the data echo mode everything that is received on the fibre optic receiver port is automatically in hardware re transmitted from the transmitter port This is made possible because of the communications standard IEC 60870 5 103 which operates half duplex Personal Computer Classical SCADA EMS Remote Control Points Optical link Parallel hardwired connections clean contacts binary inputs...

Page 50: ...tion of Figure 1 It is necessary to make dial up connection before actual information exchange P S T N Modem Classical SCADA Personal Computer EMS Remote Control Points Optical link Parallel hardwired connections clean contacts binary inputs Personal Computer Modem Modem PSTN Public Switched Telephone Network Version of the former configuration of Figure 1 It is necessary to make dial up connectio...

Page 51: ... former configuration of Figure 2 Several relays within the substation can be accessed via one modem but only one can be communicated with at a time EMS Remote Control Points P S T N Fibre Optic Hub Multiplexer Modem Modem SIGMA 1 Figure 3 Star Type Configuration Using SIGMA 1 Multiplexer Personal Computer Personal Computer Modem PSTN Public Switched Telephone Network P S T N Modem Modem Serial op...

Page 52: ...odem Modem Serial optical links Cyclical polling Man Machine Interface Tx Rx Tx Rx Tx Rx Figure 5 Direct Control System Data Concentrator Configuration Fibre Optic Serial Loop Link Tx Tx Tx Tx Rx Rx Rx Rx Remote System Tx Rx Laptop computer Remote RS232 Local RS232 SIGMA 3 RS232 RS232 Figure 6 Automatic switchover remote to local control using the SIGMA 3 When a portable PC is plugged into the fro...

Page 53: ... UDS 10 or equiv Figure 7 LAN Network connectivity using a SIGMA 3 Lantronix UDS 10 or equivalent A SIGMA 3 unit may be used to as shown in Figure 7 to connect Argus and Modular II protection relays to a local area network via an Ethernet to RS232 convertor such as the Lantronix UDS 10 or similar device SIGMA 3 units may be used on a per bay or per substation basis They provide a single point of c...

Page 54: ...mens Protection Devices Limited consent While the information and guidance given in this document is believed to be correct no liability shall be accepted for any loss or damage caused by any error or omission whether such error or omission is the result of negligence or any other cause Any and all such liability is disclaimed 2010 Siemens Protection Devices Limited MSCDN MP2A Capacitor unbalance ...

Page 55: ...ult Setting Principles 3 2 2 Setting Example 5 3 Resistor Open Circuit Protection 7 3 1 Fault Setting Principles 7 3 2 Setting Example 7 Figures Figure 1 Exponential heating and cooling curves 3 Figure 2 IEC60255 8 cold curve tau in seconds 4 2010 Siemens Protection Devices Limited Chapter 5 Page 2 of 7 ...

Page 56: ...tor Thermal Overload Protection 2 1 Fault Setting Principles The operate time of the thermal elements is given by sec I I I ln 2 2 2 P 2 τ B I k t Eq 1 Where IP Previous steady state current level IB Basic current rating of resistor k Multiplier resulting in the overload pickup setting k IB Iθ I The measured resistor current τ Thermal time constant Thermal State Time 100 Heating Cooling Available ...

Page 57: ...ay nominal current and is equivalent to the factor k IB as defined in the IEC60255 8 thermal operating characteristics It is the value of current above which 100 of thermal capacity will be reached after a period of time and it is therefore normally set slightly above the full load current of the protected device 0 1 1 10 100 1 1 5 2 2 5 Overload Level Multiple of Setting Iθ Time secs 3 tau 100 ta...

Page 58: ...p Requirements Alarm level 105 Trip level k 110 Now IB 12 20 0 6 amps And Iθ k x IB 1 1 x IB 1 1 x 0 6 0 66 Amps At an applied current of I 16 20 0 8 amps the resistor maximum withstand time is t 20 seconds Using a safety margin of 50 then 2 2 2 66 0 8 0 8 0 ln 20 5 0 τ s Thus sec 76 8 sec 2044 0 64 0 ln 10 τ τ 9 seconds will be used to satisfy the 50 safety margin 2010 Siemens Protection Devices ...

Page 59: ... 2 F θ Re arranging equation 1 we get 100 1 ln 2 2 I I t θ θ τ Eq 5 The maximum operating time of the Thermal Alarm i e from cold will given by θ 91 τ 9 s I 1 05 Iθ 1 1 t 60 02 s To achieve steady state thermal capacity of 82 6 i e from cold will given by θ 82 6 τ 9 s I 1 05 Iθ 1 1 t 21 33 s Therefore the operating time from steady state at rated current of the Thermal Alarm would be t 60s 21 3s 3...

Page 60: ... or alarm the situation The Overcurrent elements must be set to avoid operation due to resistor and CT tolerances The Overcurrent pickup and delay must be chosen to avoid operation under transient overload conditions that do not threaten the resistors thermal overload characteristics 3 2 Setting Example Resistor Characteristics Value of Resistance per limb 432Ω Maximum Tolerance 2 5 Continuous Rat...

Page 61: ...ces Limited consent While the information and guidance given in this document is believed to be correct no liability shall be accepted for any loss or damage caused by any error or omission whether such error or omission is the result of negligence or any other cause Any and all such liability is disclaimed 2010 Siemens Protection Devices Limited MSCDN MP2A Capacitor unbalance protection Document ...

Page 62: ...lation Contents 1 Unpacking Storage And Handling 3 2 Recommended Mounting Position 3 3 Relay Dimensions 3 4 Fixings 3 5 Ancillary Equipment 4 6 Precautions 4 2010 Siemens Protection Devices Limited Chapter 6 Page 2 of 4 ...

Page 63: ...e that he is at the same potential as the relay by touching the case The module must not be handled by any of the module terminals on the rear of the chassis Modules must be packed for transport in an anti static container Ensure that anyone else handling the modules is at the same potential As there are no user serviceable parts in any module there should be no requirement to remove any component...

Page 64: ...ction to the fibre optic terminals on the rear of the relay or the RS232 port on the relay fascia For local interrogation a portable PC is required The PC must be capable of running Microsoft Windows Ver 3 1 or greater and it must have a standard RS232 port A standard data cable is required to connect from the PC to the 25 pin female D type connector on the front of the relay For remote communicat...

Page 65: ...eproduced from this document unless Siemens Protection Devices Limited consent While the information and guidance given in this document is believed to be correct no liability shall be accepted for any loss or damage caused by any error or omission whether such error or omission is the result of negligence or any other cause Any and all such liability is disclaimed 2010 Siemens Protection Devices ...

Page 66: ...ming The Relay 5 7 1 Setting by laptop 5 7 2 Setting via relay fascia 5 8 Secondary Injection Tests 5 8 1 Accuracy of Measurement 6 8 2 Checking the thermal characteristic 6 8 3 Checking the open circuit protection 7 9 Primary Injection Tests 8 10 Tripping And Intertripping Tests 8 11 Putting Into Service 8 2010 Siemens Protection Devices Limited Chapter 7 Page 2 of 9 ...

Page 67: ...ate range on a multi range instrument could lead to a dangerous flashover Fused test leads should not be used where the measurement of a current transformer C T secondary current is involved the failure or blowing of an instrument fuse or the operation of an instrument cut out could cause the secondary winding of the C T to become an open circuit Open circuit secondary windings on energised curren...

Page 68: ...o PSU and I O modules excluding power supply wiring to the PSU Module Before testing the D C wiring to earth apply test connections between suitable points to short circuit each status input and series resistor to avoid possible damage to the opto coupler should the wiring be earthed d Test the power supply wiring to module PSU separately Note that the D C ve and D C ve are each connected to earth...

Page 69: ...he communications setting can be changed in Reydisp Evolution by selecting OPTIONS COMMUNICATIONS This window displays the active part of the laptop Select OK when changes are complete Set the address on Reydisp Evolution to be the same as the relay station address Check the communications link by retrieving the relay settings Relay Settings Get Settings Reydisp Evolutions allows off line generati...

Page 70: ... for Resistor R1 Disabled Enabled Enabled Gn R2 49 Thermal Overload Selects whether the thermal overload protection element is enabled for Resistor R2 Disabled Enabled Enabled When testing the thermal characteristic the status each thermal element can be displayed on the LCD by changing to the INSTRUMENTS mode and scrolling down to either R1 METERS or to R2 METERS as required The Instruments to vi...

Page 71: ...cked by first calculating the expected value and injecting current at a multiple of pickup to cause a thermal trip It is worth using the thermal time constant to be used during this test but inject current at a high multiple of setting to speed up the test Resistor 1 A B C Current Applied Amps Final thermal state PU Test A A A Th Capacity 100 Timing Test Tau TC Calculated Time _ _ _ _ _s Current I...

Page 72: ...primary injection test set and record and verify the expected levels on the instruments on the relay RESISTOR Ia Primary Injection Ia Relay Instruments Ib Primary Injection Ib Relay Instruments Ic Primary Injection Ic Relay Instruments R1 R2 10Tripping And Intertripping Tests Re connect the auxiliary d c supplies for trip and alarm operations and insert the Trip and InterTrip links Simulate the op...

Page 73: ...et Therm State Control that allows thermal state to be manually reset NO YES Selecting YES will reset the thermal state for either R1 or R2 Operate the Cancel PUSH BUTTON Check that the LCD displays the screen below or the Relay Identifier set in the SYSTEM CONFIG MENU MSCDN MP2A Replace the cover The above reading will remain for approximately 1 hour then the screen will go blank ...

Page 74: ...this document unless Siemens Protection Devices Limited consent While the information and guidance given in this document is believed to be correct no liability shall be accepted for any loss or damage caused by any error or omission whether such error or omission is the result of negligence or any other cause Any and all such liability is disclaimed 2010 Siemens Protection Devices Limited MSCDN M...

Page 75: ...MSCDN MP2A Maintenance Contents 1 Maintenance Instructions 3 2 Defect Report Form 4 2010 Siemens Protection Devices Limited Chapter 8 Page 2 of 4 ...

Page 76: ...hould be checked for operation during the normal maintenance period for the site on which the product is installed It is recommended the following tests are carried out 1 Visual inspection of the metering display every year 2 Operation of output contacts every 2 years 3 Secondary injection of each element every 5 years 2010 Siemens Protection Devices Limited Chapter 8 Page 3 of 4 ...

Page 77: ...ice or module does not start up Mechanical problem Overload Sporadic failure Knock sensitive Transport damage Permanent failure Temperature caused failure Failure after ca hrs in use Repeated breakdown Failure after firmware update Error description Display message use separated sheet for more info Active LED messages Faulty Interface s which Wrong measured value s which Faulty input s output s wh...

Page 78: ...is document unless Siemens Protection Devices Limited consent While the information and guidance given in this document is believed to be correct no liability shall be accepted for any loss or damage caused by any error or omission whether such error or omission is the result of negligence or any other cause Any and all such liability is disclaimed 2010 Siemens Protection Devices Limited MSCDN MP2...

Page 79: ...MSCDN MP2A Diagrams Figures Figure 1 Panel Fixing 3 Figure 2 Rear Terminal View 4 2010 Siemens Protection Devices Limited Chapter 9 Page 2 of 4 ...

Page 80: ...MSCDN MP2A Diagrams Figure 1 Panel Fixing 2010 Siemens Protection Devices Limited Chapter 9 Page 3 of 4 ...

Page 81: ...MSCDN MP2A Diagrams 2010 Siemens Protection Devices Limited Chapter 9 Page 4 of 4 Figure 2 Rear Terminal View ...

Page 82: ... 180 524 24 71 Charges depending on provider E mail support energy siemens com Power Distribution Division Order No C53000 G7076 C25 1 Printed in Fürth Printed on elementary chlorine free bleached paper All rights reserved Trademarks mentioned in this document are the property of Siemens AG its affili ates or their respective owners Subject to change without prior notice The information in this do...

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