GE DGP Series - Page 8

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DGP Digital Generator Protection System
GE Power Management
TABLE OF CONTENTS
4.7.7 T10: ANTI-MOTORING & SEQUENTIAL TRIP SUPERVISION 32-1 ..... 4-23
4.7.8 T11: ANTI-MOTORING 32-2 ................................................................... 4-24
4.7.9 T12: TIME OVERCURRENT WITH VOLTAGE RESTRAINT 51V .......... 4-24
4.7.10 T13: ACCIDENTAL ENERGIZATION AE ................................................ 4-25
4.7.11 T14: STATOR GROUND ZONE 1 64G1 ................................................. 4-27
4.7.12 T15: STATOR GROUND ZONE 2 64G2 ................................................. 4-28
4.7.13 T16: VOLTS/HERTZ OVEREXCITATION ALARM 24A .......................... 4-30
TEST RESULTS:.......................................................................................... 4-30
4.7.14 T17: VOLTS/HERTZ OVEREXCITATION TRIP 24T............................... 4-31
4.7.15 T18: POSITIVE-SEQUENCE OVERVOLTAGE 59.................................. 4-32
TEST RESULTS........................................................................................... 4-32
4.7.16 T19: UNDERFREQUENCY UNIT #1 81-1U ............................................ 4-33
4.7.17 T20: UNDERFREQUENCY UNIT #2 81-2U ............................................ 4-33
4.7.18 T21: UNDERFREQUENCY UNIT #3 81-3U ............................................ 4-34
4.7.19 T22: UNDERFREQUENCY UNIT #4 81-4U ............................................ 4-34
4.7.20 T23: OVERFREQUENCY UNIT #1 81-1O............................................... 4-35
4.7.21 T24: OVERFREQUENCY UNIT #2 81-2O............................................... 4-35
4.7.22 T25: OVERFREQUENCY UNIT #3 81-3O............................................... 4-36
4.7.23 T26: OVERFREQUENCY UNIT #4 81-4O............................................... 4-36
4.7.24 T27: VOLTAGE TRANSFORMER FUSE FAILURE VTFF ...................... 4-37
4.7.25 T28: TOC GROUND OVERCURRENT 51GN......................................... 4-37
4.7.26 T29: UNDERVOLTAGE 27...................................................................... 4-38
4.7.27 T30: THIRD HARMONIC NEUTRAL UNDERVOLTAGE 27TN............... 4-38
4.8 END OF ACCEPTANCE TESTING
4.8.1 DESCRIPTION ........................................................................................ 4-40
5. PERIODIC TESTS
5.1 INTRODUCTION
5.1.1 DESCRIPTION .......................................................................................... 5-1
5.1.2 GENERAL TESTS ..................................................................................... 5-1
5.1.3 PROTECTION FUNCTION TESTS ........................................................... 5-1
5.1.4 GENERAL INSTRUCTIONS...................................................................... 5-1
5.2 RELAY TESTS
5.2.1 T1: RELAY STATUS & MMI ...................................................................... 5-2
a STATUS CHECK ....................................................................................... 5-2
b DISPLAY TEST.......................................................................................... 5-2
5.2.2 T2: DIGITAL OUTPUT TEST..................................................................... 5-3
5.2.3 T3: DIGITAL INPUT TEST......................................................................... 5-4
5.2.4 T4: AC SYSTEM INPUT TEST.................................................................. 5-5
5.3 MEASURING UNIT TESTS
5.3.1 DESCRIPTION .......................................................................................... 5-6
5.3.2 T5: GENERATOR DIFFERENTIAL TEST 87G ......................................... 5-6
5.3.3 T6: CURRENT UNBALANCE ALARM 46A ............................................... 5-6
5.3.4 T7: CURRENT UNBALANCE TRIP 46T.................................................... 5-7
5.3.5 T8: LOSS OF EXCITATION 40-1 .............................................................. 5-8
5.3.6 T9 ANTI-MOTORING TEST 32-1 ..............................................................5-9
5.3.7 T10: TIME OVERCURRENT WITH VOLTAGE RESTRAINT 51V .......... 5-10
5.3.8 T11: STATOR GROUND ZONE 1 64G1 ................................................. 5-11
5.3.9 T12: STATOR GROUND ZONE 2 64G2 ................................................. 5-11
5.3.10 T13: VOLTS/HERTZ OVEREXCITATION ALARM 24A .......................... 5-12
5.3.11 T14: VOLTS/HERTZ EXCITATION TRIP 24T.........................................5-13
5.3.12 T15: POSITIVE-SEQUENCE OVERVOLTAGE 59.................................. 5-14
5.3.13 T16: UNDERFREQUENCY UNIT #1 81-1U ............................................ 5-14
5.3.14 T17: OVERFREQUENCY UNIT #1 81-1O............................................... 5-15
5.3.15 T18: VOLTAGE TRANSFORMER FUSE FAILURE VTFF ...................... 5-15
5.3.16 T19: TOC GROUND OVERCURRENT 51GN......................................... 5-16