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4 ACCEPTANCE TESTS
4 ACCEPTANCE TESTS 4.1 INTRODUCTION
POWER DOWN THE RELAY BEFORE REMOVING OR INSERTING MODULES. FAILURE TO DO
SO CAN PERMANENTLY DAMAGE THE RELAY!
CAUTION
This section is a guide for testing the relay. It is not necessary that these tests be performed for incoming
inspection. The relay has been tested at the factory with automated test equipment. The DGP is a digital relay
controlled by self-checking software. If a system failure is detected, it will be reported through the MMI and
remote communications.
The following tests include: Relay status self test and display and MMI self test. Tests of the protection func-
tions and measuring accuracy are also included and can be performed at the user's discretion. Protection func-
tions that end with an asterisk (*) are available on certain models only – see the DGP model list in Section
1.1.2: ORDER CODES & SELECTION GUIDE on page 1–2.
a) GENERAL TESTS
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T1: MMI Status and Display Tests (Self-tests)
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T2: Digital Output Tests
b) PROTECTION TESTS
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T5: Generator Differential, 87G
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T6: Current Unbalance Alarm, 46A
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T7: Current Unbalance Trip, 46T
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T8: Loss of Excitation, 40-1
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T9: Loss of Excitation, 40-2
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T10: Anti-Motoring, 32-1
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T11: Anti-Motoring, 32-2 *
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T12: Time Overcurrent with Voltage Restraint,
51V
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T13: Accidental Energization, AE
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T14: Stator Ground Zone1, 64G1
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T15: Stator Ground Zone2, 64G2 *
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T16: Overexcitation (Volts/Hz) Alarm, 24A
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T17: Overexcitation (Volts/Hz) Trip, 24T
* Functions available in some models only.
GE Power Management
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DGP Digital Generator Protection System
4.1 INTRODUCTION
T3: Digital Input Tests
T4: AC System Input Test
T18: Overvoltage, 59
T19: Underfrequency, 81-1U
T20: Underfrequency, 81-2U
T21: Underfrequency, 81-3U *
T22: Underfrequency, 81-4U *
T23: Overfrequency, 81-1O
T24: Overfrequency, 81-2O
T25: Overfrequency, 81-3O *
T26: Overfrequency, 81-4O *
T27: Voltage Transformer Fuse Failure, VTFF
T28: TOC Ground Overcurrent, 51GN *
T29: Undervoltage, 27 *
T30: 3rd Harmonic Neutral Undervoltage, 27TN *
4.1.1 WARNING
4.1.2 GENERAL
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