T5: Generator Differential Test 87G - GE DGP Series Instruction Manual

4.7 PROTECTION TESTS
1. Settings:
87G
(203) K1 = 5
(204) PICKUP = 0.3 (0.06) A
2. Connect the relay as shown in Figure 4–6: GENERATOR DIFFERENTIAL TEST CONNECTIONS.
3. Set up relay in test mode for the 87G function; 87G ON will be displayed on the MMI.
4. Set the current of IAR to 5 A (1 A) rms and IAS to 5 A (1 A) rms in phase. The test pickup and test trip con-
tacts should not operate. Increase IAS to 7 A (1.3 A) rms and test pickup and test trip should operate.
5. Set IAS to 5 A (1 A) rms and test pickup and test trip should not operate.
6. Decrease IAS to 3 A (0.75 A) rms and test pickup and test trip should operate.
7. Repeat the above test for phases B (IBR, IBS) and C (ICR, ICS).
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4.7.2 T5: GENERATOR DIFFERENTIAL TEST 87G

DGP Digital Generator Protection System
4 ACCEPTANCE TESTS
GE Power Management