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INSTRUCTION MANUAL

FOR

TRANSFORMER DIFFERENTIAL RELAY

BE1-87T

0052-

Serial No. XXXXXXXXXXXX

Style No. D2E A1J D1S0F

PUSH TO

ENERGIZE

OUTPUT

TRANSFORMER DIFFERENTIAL

BE1-87T

Publication:

9171300990

Revision:

09/07

www

. ElectricalPartManuals

. com

Summary of Contents for BE1-87T

Page 1: ...FFERENTIAL RELAY BE1 87T P0052 22 Serial No XXXXXXXXXXXX Style No D2E A1J D1S0F R PUSH TO ENERGIZE OUTPUT R U TRANSFORMER DIFFERENTIAL BE1 87T Publication 9171300990 Revision R 09 07 w w w E l e c t r...

Page 2: ...w w w E l e c t r i c a l P a r t M a n u a l s c o m...

Page 3: ...Description Installation Test Procedures WARNING To avoid personal injury or equipment damage only qualified personnel should perform the procedures in this manual NOTE Be sure that the relay is hard...

Page 4: ...ailability and design of all features and options are subject to modification without notice Should further information be required contact Basler Electric BASLER ELECTRIC ROUTE 143 BOX 269 HIGHLAND I...

Page 5: ...between terminals 6 7 in Figure 4 11 Added a shorting bar and normally open contact and normally closed contact effecting terminals 1 2 5 in Figure 4 12 Step 13 was corrected on pages 4 31 and 4 39 t...

Page 6: ...g relay setting from Section 5 Testing and Setting to Section 4 Installation Section 5 now contains information on test procedures Combined 50 and 60 Hz Verification Tests Various editorial changes Re...

Page 7: ...7 Manual Change Information to Section 8 Manual Change Information and added new Section 7 Difference Data to support BE1 87T relays with Sensing Input Type F D 06 92 Manual was revised to include the...

Page 8: ...vi BE1 87T Introduction 9171300990 Rev R This page intentionally left blank w w w E l e c t r i c a l P a r t M a n u a l s c o m...

Page 9: ...uts 1 7 Target Indicators 1 7 Harmonic Attenuation 1 7 Timing 1 7 Isolation 1 9 Power Supply 1 9 Surge Withstand Capability 1 9 Radio Frequency Interference RFI 1 9 UL Recognition 1 9 GOST R Certifica...

Page 10: ...5 7 VERIFICATION TESTS 5 AMP CT 50 OR 60 HZ UNITS 5 9 Restrained Pickup Level Verification 5 9 Input or Tap Switch Verification 5 10 Unrestrained Pickup Verification 5 11 Second Harmonic Restraint Ve...

Page 11: ...TTING NOTE 3 A 3 SETTING NOTE 4 A 4 SETTING NOTE 5 A 4 Slope Margin A 4 SETTING NOTE 6 A 6 Inrush vs Unrestraint Tap A 6 SETTING NOT 7 A 7 CT Performance Evaluation Saturation Error A 7 Saturation Fac...

Page 12: ...x BE1 87T Introduction 9171300990 Rev R This page intentionally left blank w w w E l e c t r i c a l P a r t M a n u a l s c o m...

Page 13: ...e F There are also differences in the output connections as described in Section 6 Difference Data DESCRIPTION BE1 87T Transformer Differential Relays provide primary protection for power transformers...

Page 14: ...ground fault conditions on the wye system Three Phase BE1 87T Three Phase relays can provide zero sequence filtering and compensation for phase shifts introduced by the connections of the power transf...

Page 15: ...high harmonic content in the waveform Lack of operation can result in severe transformer damage BE1 87T relays provide an independent unrestrained tripping function When set above the possible inrush...

Page 16: ...tyle Number Identification Chart Figure 1 1 defines the electrical characteristics and operational features included in BE1 87T relays For example if the Style Number were G1E A1Y D1S0F the device wou...

Page 17: ...otary switches labeled INPUT permit scaling the sensed input current or tap setting over the range of 1 Ampere CT Units 0 4 to 1 78 in 0 02 A increments 5 Ampere CT Units 2 0 to 8 9 A in 0 1 A increme...

Page 18: ...of the operating current for single phase Units or 11 to 27 for three phase units The factory setting is 12 for single phase units and 18 for three phase units Fifth Harmonic Restraint Inhibit of the...

Page 19: ...utes and 3 A continuously Single Phase Units Either an internally operated or a current operated target is supplied as selected by the Style Number for each trip output i e the restrained and the unre...

Page 20: ...1 8 BE1 87T General Information 9171300990 Rev R Figure 1 3 Unrestrained Response Times Figure 1 4 Restrained Response Times w w w E l e c t r i c a l P a r t M a n u a l s c o m...

Page 21: ...sts for Protective Relays and Relay Systems and IEC 255 5 Impulse Test and Dielectric Test Radio Frequency Interference RFI Maintains proper operation when tested in accordance with IEEE C37 90 2 1987...

Page 22: ...F Storage Temperature 65 C 85 F to 100 C 212 F Weight 22 3 lbs 10 1 kg maximum three phase unit 19 5 lbs 8 85 kg maximum single phase unit Case Size All units are supplied in an M1 case size See Sect...

Page 23: ...d to represent the units digit 2 through 8 of tap value Each of the lower switches is calibrated to represent tenths of tap value Always add the setting of the lower switch to that of the upper switch...

Page 24: ...o close when either output occurs S1 and S2 ON When shipped from the factory the Auxiliary Relay will be configured with S1 and S2 ON NOTE The switches are located on the mother board and are only acc...

Page 25: ...TRIP LEDs Q OF TRIP Indicators Option When the OF TRIP pushbutton P is pushed eight LEDs shown in Figure 2 5 are used to indicate the approximate percentage of operating current to Minimum pickup LED...

Page 26: ...PHASE C POWER TRIP REST UNREST TRIP TRIP UNREST REST TRIP TRIP UNREST REST TRIP RESTRAINED PICKUP LEVEL U S PATENT 5 014 153 0 00 0 18 0 00 0 18 0 00 0 18 0 06 0 12 0 40 1 00 1 60 INPUT 1 INPUT 2 1 00...

Page 27: ...16 15 14 13 12 11 10 9 8 7 6 S R P N M L K J H G F E D C B A TRIP REST UNREST TRIP 0 00 0 18 0 12 0 06 0 40 INPUT 5 1 60 1 00 INPUT 4 1 60 1 00 0 40 0 06 0 12 INPUT 3 1 60 1 00 0 40 0 06 0 12 0 12 0...

Page 28: ...P R S PHASE A PHASE B PHASE C POWER TRIP REST UNREST TRIP TRIP UNREST REST TRIP TRIP UNREST REST TRIP RESTRAINED PICKUP LEVEL U S PATENT 5 014 153 0 00 0 18 0 00 0 18 0 06 0 12 0 40 1 00 1 60 INPUT 1...

Page 29: ...AUX UNRES P6 J2 D B AUX RES ON S1 CR19 CR7 42 LH EDGE OF ANALOG 2 BOARD THE 4TH BOARD DOWN COUNTING THE MAGNETIC BOARD AR J11 J2 VR2 TP 12V C1 J1 0A 0B 0C J9 J10 IN 1 IN 2 IN 3 1 2 WYE 1 2 WYE 1 2 WY...

Page 30: ...rial No XXXXXXXXXXXX Style No D3E A1J D1S0F R PUSH TO ENERGIZE OUTPUT R U TRANSFORMER DIFFERENTIAL BE1 87T Q P K M L N O Figure 2 5 Sensing Input Range 2 or 4 Option 1 1 Single Phase Five Inputs OF TR...

Page 31: ...e front panel INPUT rotary switches that introduce resistances to the internal CT secondaries The switches are calibrated in 0 02 ampere increments from 0 4 to 1 78 ampere for 1 ampere CT units Option...

Page 32: ...F 3 PHASES SEE NOTE 5 BE1 87T D741 001b 7 11 94 COM IN 1 IN 2 IN 3 COM IN 1 IN 2 IN 3 0B 0C Figure 3 2 Functional Block Diagram Phase B and Phase C S2 S1 IN 3 B SCALE IN 3 C SCALE 0 0 IN 1 B SCALE IN...

Page 33: ...o cause an inhibit as described below a Restrained Trip output is produced IOP Divided By IMAX contains eight comparators and compares IOP to the preset percentage levels of IMAX If IOP is greater tha...

Page 34: ...indicators The appropriate target is tripped when either a restrained R or unrestrained U output occurs Latched targets are reset by operating the target reset switch on the front panel If relay opera...

Page 35: ...percentages 1 LED 3 Yellow LED 2 LEDs 7 Yellow LED 3 LEDs 11 Yellow LED 4 LEDs 20 Red LED 5 LEDs 40 Red LED 6 LEDs 60 Red LED 7 LEDs 80 Red LED 8 LEDs 100 Red LED A bar chart above the LEDs shows the...

Page 36: ...3 6 BE1 87T Functional Description 9171300990 Rev R This page intentionally left blank w w w E l e c t r i c a l P a r t M a n u a l s c o m...

Page 37: ...alled it is suggested that the connection plugs or paddles of the relay be removed and the cradle withdrawn from the case so as not to produce false readings during the wiring insulation test 3 When t...

Page 38: ...4 2 BE1 87T Installation 9171300990 Rev R Inches Millimeters Figure 4 1 Outline Dimensions Front View w w w E l e c t r i c a l P a r t M a n u a l s c o m...

Page 39: ...9171300990 Rev R BE1 87T Installation 4 3 Inches Millimeters Figure 4 2 Outline Dimensions Rear View w w w E l e c t r i c a l P a r t M a n u a l s c o m...

Page 40: ...4 4 BE1 87T Installation 9171300990 Rev R Inches Millimeters Figure 4 3 Outline Dimensions Side View Semi Flush Mounting w w w E l e c t r i c a l P a r t M a n u a l s c o m...

Page 41: ...9171300990 Rev R BE1 87T Installation 4 5 Inches Millimeters Figure 4 4 Panel Drilling Diagram Semi Flush Mounting w w w E l e c t r i c a l P a r t M a n u a l s c o m...

Page 42: ...4 6 BE1 87T Installation 9171300990 Rev R Inches Millimeters Figure 4 5 Outline Dimensions Side View Projection Mounting w w w E l e c t r i c a l P a r t M a n u a l s c o m...

Page 43: ...27 12 a 01 16 98 TERMINAL NUMBERS SHOWN ARE AS VIEWED FROM REAR OF RELAY NOTES 2 1 OPTIONAL RECTANGULAR CUTOUT MAY REPLACE 10 DRILLED HOLES BOTTOM HALF OF PANEL DRILLING DIAGRAM FROM CENTERLINE 3 DOWN...

Page 44: ...4 8 BE1 87T Installation 9171300990 Rev R Inches Millimeters Figure 4 6b Panel Drilling Diagram Bottom Half Projection Mounting w w w E l e c t r i c a l P a r t M a n u a l s c o m...

Page 45: ...wire attached to the ground terminal on the rear of the relay case When the relay is configured in a system with other protective devices it is recommended to use a separate lead to the ground bus fr...

Page 46: ...MON 9 AUX N O AUX N C AUX COM BE1 87T D437 002 9 23 94 BE1 87T CONFIGURATION IS DEPENDENT ON STYLE SELECTED 1 A 0 0 C 0 A 0 0 0 1 5 20 1 2 19 10 8 Figure 4 8 Case Terminals Three Phase Two Input Sensi...

Page 47: ...9171300990 Rev R BE1 87T Installation 4 11 Figure 4 10 Case Terminals Three Phase Three Input Sensing Input Type G Output Option E w w w E l e c t r i c a l P a r t M a n u a l s c o m...

Page 48: ...4 12 BE1 87T Installation 9171300990 Rev R Figure 4 11 Internal Connections Single Phase Five Input Sensing Input Type D Output Option E w w w E l e c t r i c a l P a r t M a n u a l s c o m...

Page 49: ...9171300990 Rev R BE1 87T Installation 4 13 Figure 4 12 Internal Connections Three Phase Two Input Sensing Input Type E Output Option E w w w E l e c t r i c a l P a r t M a n u a l s c o m...

Page 50: ...5 16 17 18 19 20 1 3 2 4 5 6 7 8 9 10 UNREST COM REST REST REST D983 025 2 18 93 BE1 87T POWER SUPPL Y UNREST TRIP C2 A2 COM 1 COM2 B2 C1 0 0 0 0 B1 0 A1 0 TARGET REST TRIP C 0 REST TRIP B 0 REST TRIP...

Page 51: ...GET Figure 4 14 Internal Connections Three Phase Three Input Sensing Input Type G Output Option E 87T 87T 87T 87T 87T 87T 87T 87T 87T 87T 87T 87T 86 86 9 8 10 RESTRAINED UNREST 3 4 5 6 7 19 20 POWER S...

Page 52: ...OPTION FOR 2 Figure 4 16 Control Circuits Three Phase Two Input Sensing Input E Output Option E 87T UNRESTRAINED 87T RESTRAINED PHASE A 87T RESTRAINED PHASE B 87T RESTRAINED PHASE C 86 87T 20 87T 19...

Page 53: ...your hand on the metal surface before handling the boards 3 Never hand a printed circuit board to another person whose static body charge has not been neutralized 4 Testing or troubleshooting should...

Page 54: ...C Figure 4 19 Side View of Cradle Assembly DISABLING UNUSED INPUTS To eliminate the possibility of a spurious input from induced currents within the relay special internal jumpers have been provided...

Page 55: ...CR14 CR15 C45 R48 R29 R21 R28 R54 R3 R49 C21 C34 C18 R58 U10 22 3 J3 J2 J1 EN OIS NOTE D641 001 9 21 94 BE1 87T Figure 4 20 Unused Input Disabling Jumpers Analog 1 Board Option 1 0 DISABLE INPUT 3 ENA...

Page 56: ...lly used which must be Inputs 1 and 2 it is important to disable the unused input of each phase by means of the internal Input Disabling jumpers provided on each of the three Analog Boards 1 as shown...

Page 57: ...BREAKER BREAKER Figure 4 22 Typical Single Phase Sensing Connections 13 11 C 1 2 12 12 11 13 13 11 12 03 12 98 D1186 02 C B A C B A X3 X2 X1 H3 H2 H1 X0 SWITCH BOARD TERMINAL BLOCKS BE1 87T 1 BE1 87T...

Page 58: ...2 04 16 99 D1186 20 vsd C B A C B A X3 X2 X1 H3 H2 H1 X0 SWITCH BOARD TERMINAL BLOCKS BE1 87T 1 BE1 87T 2 BE1 87T 3 C 1 2 C 1 2 H0 B C A H3 H2 H1 X1 X2 X3 H0 X0 Figure 4 24 Single Phase Connections Wy...

Page 59: ...X1 X2 X3 C B A X0 BE1 87T 1 13 12 14 C 2 3 1 11 BE1 87T 2 13 12 14 C 2 3 1 11 BE1 87T 3 13 12 14 C 2 3 1 11 SWICH BOARD TERMINAL BLOCKS B C A H3 H2 H1 X1 X2 X3 Y3 Y2 Y1 Figure 4 25 Single Phase Conne...

Page 60: ...f three phase BE1 87T relays Advantages of Internal Phase Compensation Three phase units provide for internal phase angle compensation Among the advantages of this method is the ability to connect all...

Page 61: ...ng access to the circuit board then adjust the jumpers shown in Figure 4 27 as follows In cases where no phase shift is wanted all three jumpers A B and C shown in Figure 4 27 are in the WYE WYE posit...

Page 62: ...e A B and C respectively as reflected from the wye connected secondary winding The delta connection of the transformer windings causes the current flowing in the phase leads connected to the delta win...

Page 63: ...the ground to a lead connected to terminal 18 D2751 21 03 12 98 B C A H3 H2 H1 X1 X2 X3 Figure 4 28a Three Phase Connections Delta Wye Configuration CT Compensation H2 H1 H3 C B A X2 X1 X0 X3 C B A 1...

Page 64: ...delta connection on the secondary winding The currents in each winding of the delta are A B and C respectively as reflected from the wye connected primary winding The delta connection of the transform...

Page 65: ...17 18 15 16 14 13 11 12 WYE BE1 87T Switch board terminal blocks D2751 24 03 12 98 X2 X3 X1 WYE B C A H3 H2 H1 Phase shift jumper position on analog board 2 Figure 4 30 Three Phase Connections Delta D...

Page 66: ...R IF THE WYE WINDING IS UNGROUNDED IT IS UNNECESSARY TO DELTA SHIFT THE CURRENTS FOR ZERO SEQUENCE BLOCKING NOTES X2 Phase shift jumper position on analog board 2 B C A Figure 4 31a Three Phase Connec...

Page 67: ...A 16 17 18 15 12 14 13 11 1 OR 2 BE1 87T C B A N B C N A THE BE1 87T MUST USE THE SAME PHASE COMPENSATION JUMPER POSITION ON ALL INPUTS NOTES 1 OR 2 Phase shift jumper position on analog board 2 Figu...

Page 68: ...ents in each winding of the delta are A B and C respectively as reflected from the wye or auto connected winding The delta connection of the transformer windings causes the current flowing in the phas...

Page 69: ...ere zero balance current is assumed in each pair of windings successively NOTE The dc component of the input current is effectively blocked by the gapped cores of the input CTs Therefore for offset fa...

Page 70: ...ondary current in amperes IT Rated self cooled current of the power transformer in multiples of tap MN Current mismatch with power transformer on its neutral tap MR Multiple rating CT i e a tapped CT...

Page 71: ...NOTE Three phase is the most common application of the BE1 87T Using single phase relays requires a Delta connection for the High side and Low side CTs IA IB to match the tertiary connection in the e...

Page 72: ...7 55 Step 5 Determine the spread ratio of the relay currents largest smallest Spread 18 22 6 04 3 0 Step 6 Determine the Driving InputError Bookmark not defined DP which we define as the input assign...

Page 73: ...T 0 6 10 10 6 Verify CT Performance NOTE This procedure uses the ANSI accuracy class method See Appendix A Setting Note 7 for more information Step 12 Determine the maximum CT secondary fault current...

Page 74: ...itive sequence to zero sequence currents but may be approximated by the same equation Neglecting RR use RW and RL from Figure 4 33 HIGH TERTIARY LOW 7 0 2 28 BG V 2 39 NONE 7 0 2 38 BG V 2 53 Step 15...

Page 75: ...X TAP I Max E HIGH TERTIARY LOW IE not maximum IE not maximum X TAP 0 7 24 16 8 Note The restrained element will not operate due to the large 2nd harmonic component present in the highly distorted cur...

Page 76: ...L T I P L E S O F T A P I op I N Figure 4 34 Slope Needed to Accommodate Total Mismatch with Adequate Margin Specifically if the maximum saturation factor SF from Step 16 exceeds 0 5 set the RESTRAINE...

Page 77: ...slope settings see Table 4 2 Table 4 2 Examples of Suitable Slope Settings Maximum Mismatch in MT Current Rating of Power Transformer in Multiples of TAP IT Recommended Minimum RESTRAINED PICKUP LEVE...

Page 78: ...ap 300 800 CT Accuracy Class 400 800 CT Resistance ohms 0 18 0 48 One Way Lead Burden ohms 0 7 0 7 XFMR Connection DELTA WYE CT Connection WYE WYE Input 1 2 Fault Current Three Phase 1 916 10 603 Faul...

Page 79: ...e zero sequence currents must be canceled by connecting the low side CTs in delta Step 4 Determine the relay current IR IR IS x Conversion Factor Three Phase Units Only When using either 1 or 2 jumper...

Page 80: ...9 7 18 Step 9 Select taps by rounding TD to the nearest tenth T1 2 0 T2 7 2 Step 10 Determine the CT mismatch MN MN 100 Current Ratio Tap Ratio the smaller of the above I I T T Smaller R2 R1 1 2 100 0...

Page 81: ...three phase fault VB3 IF3 RW 3RL 3RR Note that the wye connection produces a lower burden on the CTs see Appendix A Note 2 Where IF3 determined in Step 12 RL one way lead resistance in ohms RW windin...

Page 82: ...0 300 600 200 VCE 800 800 2000 5333 Step 16 Determine the saturation factor SF VB is the largest of the burden voltages calculated in steps 13 and 14 SF VB VCE HIGH LOW 11 0 200 4 22 F S 18 0 3 533 0...

Page 83: ...r than the result obtained in Step 18 Therefore for this example select SET position G 12 X TAP which is higher than the above result of 11 17 X TAP If this value exceeds 21 max setting raise the tap...

Page 84: ...et the RESTRAINED PICKUP LEVEL to setting K which is equal to 60 as shown in the table on the front panel For all other cases including this example use the following equation S M I T T 3 35 3 23 4 Wh...

Page 85: ...each current input testing two inputs at a time Begin with Inputs 1 and 2 CAUTION When more than two inputs are present all inputs not being tested must be shorted to ground Single Phase Units Relay m...

Page 86: ...s for reference only and applies to three phase units with Input 3 at zero amperes 2 For A B C rotation MAINTENANCE BE1 87T relays require no preventative maintenance other than a periodic operational...

Page 87: ...fingers on the red side of the test plug are connected to the outer binding posts red thumbnuts and also connect to the relay case terminals When testing circuits connected to the bottom set of case...

Page 88: ...4 52 BE1 87T Installation 9171300990 Rev R This page intentionally left blank w w w E l e c t r i c a l P a r t M a n u a l s c o m...

Page 89: ...are provided for clarification For routine assurance that the BE1 87T is operating correctly the simplified OPERATIONAL TESTS may be performed Before starting a test program check the Style Number of...

Page 90: ...the restrained trip occurs is unbalance maximum restraint or 0 35 pu whichever is greater slope 100 Where unbalance absolute value of I1 I2 in per unit pu i e I T I T 1 1 2 2 slope the RESTRAINED PIC...

Page 91: ...1 0 35 in pu Equation 2 OR I T I T trip 1 1 2 2 0 35 min in Amps Equation 2a Example One Assume tap tap slope 1 2 2 38 15 Inputs I A pu I T pu I A pu I T pu 1 1 1 2 2 2 2 1 2 2 1 38 1 38 38 1 Check I...

Page 92: ...2 3 114 3 114 38 3 Check I balance slope slope 1 0 35 100 1 100 in pu 3 1 983 3 0 35 0 15 1 0 15 Therefore Use Equation 1 or 1a From Figure 1 2 the percentage restraint characteristic of the BE1 87T...

Page 93: ...easing the I2 input current from balance The balance current is I I T T 2 1 2 1 1 When I slope balance 2 0 35 100 in pu OR I T slope 1 1 0 35 100 the value of I2 trip max is defined as I I slope trip...

Page 94: ...Tap 0 65 3 8 2 47 A 6 100 mA Using Equation 4a I trip 2 38 2 2 0 35 2 47 A Example Four Assume tap 2 tap 3 8 slope 15 1 2 Inputs 6 A 3 pu 11 4 A 3 pu I I 1 2 Check I balance slope 2 0 35 100 in pu 3...

Page 95: ...ducing the current of one input the published trip non trip regions are as defined by Figure 1 2 TEST SETUP DIAGRAMS Refer to the appropriate test setup diagram under Related Topics Figure 5 2 Test Se...

Page 96: ...cedures 9171300990 Rev R Figure 5 4 Test Setup Three Phase Sensing Input Type E Output Option F Figure 5 5 Test Setup Three Phase Sensing Input Type G Output Option E w w w E l e c t r i c a l P a r t...

Page 97: ...jumpers Step 4 Three Phase Units Only Check that all of the 30 Phase Shift Compensation jumpers on the Analog Board 2 shown in Figure 4 27 are in the WYE position If not reposition these jumpers accor...

Page 98: ...1 2 86 0 27 2 47 0 25 30 6 0 3 11 4 3 8 57 0 61 7 98 0 58 35 2 0 1 3 8 1 3 08 0 28 2 47 0 25 35 6 0 3 11 4 3 9 23 0 65 7 41 0 54 40 2 0 1 3 8 1 3 33 0 30 2 28 0 24 40 6 0 3 11 4 3 10 00 0 70 6 84 0 5...

Page 99: ...hes to the 2 0 A position Connect the relay as appropriate refer to Figures 5 2 through 5 5 using terminals 11 13 Input 1 for both single phase and three phase units Step 2 Set the UNRESTRAINED PICKUP...

Page 100: ...hree phase units Step 6 Three Phase Units Only Repeat Steps 1 through 5 for phase B terminals 12 13 and phase C terminals 14 13 Step 7 Three Phase Units Only Upon completion of above testing return th...

Page 101: ...through 5 for Phases B and C Step 7 Place the UNRESTRAINED PICKUP LEVEL switch to the A setting 6 X TAP Place all of the INPUT switches to the 2 0 A tap position Step 8 With 0 0 A at Input 1 terminals...

Page 102: ...tep 4 Three Phase Units Only Check that all of the 30 Phase Shift Compensation jumpers on the Analog Board 2 shown in Figure 4 27 are in the WYE position If not reposition these jumpers accordingly NO...

Page 103: ...3 2 28 3 1 714 0 123 1 596 0 116 35 0 4 1 0 76 1 0 615 0 057 0 494 0 050 35 1 2 3 2 28 3 1 846 0 131 1 482 0 109 40 0 4 1 0 76 1 0 667 0 060 0 456 0 047 40 1 2 3 2 28 3 2 000 0 140 1 368 0 102 55 0 4...

Page 104: ...e and three phase units Step 2 Set the UNRESTRAINED PICKUP LEVEL switch to position A 6 X TAP Increase the input current until the UNREST TRIP LED lights disregard the REST TRIP LED This should occur...

Page 105: ...12 13 and phase C terminals 14 13 Step 7 Three Phase Units Only Upon completion of above testing return the three calibrate toggle switches S2 letter D of Figure 2 4 to the NORM position Fifth Harmon...

Page 106: ...its Only Repeat Steps 1 through 5 for Phases B and C Step 7 Place the UNRESTRAINED PICKUP LEVEL switch to the A setting 6 X TAP Place all of the INPUT switches to the 0 4 A tap position Step 8 With 0...

Page 107: ...Pickup NOTE When making restrained pickup tests always decrease one current starting from a balanced input Since percentage restraint is derived from the maximum current at any one input an increase o...

Page 108: ...extinguishes The inhibit percentage is 100 250 50 I I at the point where the LED extinguishes Expected Values 35 3 for single phase or three phase units For 60 Hz Units Holding the 60 Hz current const...

Page 109: ...oes not respond Step 2 Connect Input 1 current to terminals A and C Connect Input 2 current to terminals A and C This verifies the A and C phase differential circuits which respond together as provide...

Page 110: ...phase differential circuits which respond together as provided earlier in the Verification Tests 5 Amp CT or Verification Tests 1 Amp CT in this section The B phase differential circuit sees no curre...

Page 111: ...this section The C phase differential circuit sees no current and does not respond Step 3 Connect Input 1 current to terminals C and N Connect Input 2 current to terminals C and N This verifies the B...

Page 112: ...ase differential circuits which respond together as provided earlier in the Verification Tests 5 Amp CT or Verification Tests 1 Amp CT in this section The A phase differential circuit sees no current...

Page 113: ...ed PSS output at terminals 9 and 19 and have NO shorting bars across the PSS terminals refer to Figure 4 7 Sensing input type G relays have terminal 20 for the common terminal on restrained and unrest...

Page 114: ...6 2 BE1 87T Difference Data 9171300990 Rev R Figure 6 1 Style Number Identification Chart w w w E l e c t r i c a l P a r t M a n u a l s c o m...

Page 115: ...9171300990 Rev R BE1 87T Difference Data 6 3 Figure 6 2 Typical Internal Connections Three Phase Sensing Input Type F Output Option E w w w E l e c t r i c a l P a r t M a n u a l s c o m...

Page 116: ...T Difference Data 9171300990 Rev R Figure 6 3 Case Terminals Sensing Input Type F Output Option E Figure 6 4 Test Setup Sensing Input Type F Output Option E w w w E l e c t r i c a l P a r t M a n u a...

Page 117: ...the relay taps are determined by the windings turn ratios The use of the MVA rating is only a convenient way of calculating the currents i e taps in proportion to their voltage rating It does not mean...

Page 118: ...RR IA IB IC 0 IA IB IC V IARW IA IC RL RR IB IA RL RR IA RW RL RR RL RR IB RL RR IC RL RR IA RW 2RL 2RR IB IC RL RR Since IA IB IC V IA RW 3RL 3RR Where IA 3 Phase fault current RR Relay burden RL Le...

Page 119: ...IA D2779 01 04 16 99 Assuming Z1 Z2 3 2 3 I I Phase 2 carries twice the fault current returning from the relay to the CTs Therefore the maximum current is 3 3 3 2 3 2 2 I I I I I MAX MAX Figure A 3 Ph...

Page 120: ...g current in one winding The magnetizing current is assumed to be 4 of the OA rating Step 20 is used to scale this magnetizing ratio to the corresponding ratio of relay operate current 4 x IT The form...

Page 121: ...5 10 0 5 10 15 20 0 10 20 30 MT SLOPE D2751 28 02 12 98 Figure A 5 BE1 87T Slope vs MT and IT 0 5 10 0 5 10 15 20 0 5 10 15 IT MT MARGIN D2751 29 02 12 98 Figure A 6 BE1 87T Margin vs MT and IT w w w...

Page 122: ...mer OA base For a XT 6 I PU F 1 06 16 7 The unrestraint tap MPU would be set for 0 7 16 7 117 pu Note that 11 7 pu value is different from the relay UR tap setting The inrush current is generally assu...

Page 123: ...ractice requires that the ratio error remain below 10 during the initial transient offset period if possible particularly when fast tripping is in effect It has been generally accepted that a design f...

Page 124: ...he excitation curve as Where Ve is the internal excitation voltage VT Rs IF at the maximum fault current IF and V10 is the voltage of the curve passing through point Q where the exciting is 10A This v...

Page 125: ...greater than the burden value Zc the two saturation factor equations are nearly identical The ANSI Accuracy Class method yields the larger more conservative result For low values of ZB and large value...

Page 126: ...shows that the easy to apply SF based on the ANSI Accuracy Class may yield optimistic results in cases where the CT internal resistance is significant The Excitation curve method requiring more data...

Page 127: ...ROUTE 143 BOX 269 HIGHLAND IL 62249 USA http www basler com info basler com PHONE 1 618 654 2341 FAX 1 618 654 2351 w w w E l e c t r i c a l P a r t M a n u a l s c o m...

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