GE DGP Series Instruction Manual page 138

4.7 PROTECTION TESTS
Skip this test if your DGP model does not include this function. This function is not available
on DGP***ABA model relays.
NOTE
1. Make the following Settings changes:
81-3U
(1903) SET PNT = 60
(1904) TL10 = 2
2. Connect relay as shown in Figure 4–8: STANDARD FUNCTIONAL TEST CONNECTIONS on page 4–26.
3. Set up relay in test mode for the 81-3U function; 81-3U ON will be displayed on the MMI.
4. Set all current inputs to 0. Using a 61 Hz source, set the voltage inputs to:
VA = 70 V rms ∠0°,
VB = 70 V rms ∠–120°,
VC = 70 V rms ∠–240°.
4
5. Verify that test pickup and test trip do not operate.
6. Change the frequency of the voltage inputs to 59 Hz.
7. Verify that test pickup operates immediately and test trip operates in 2.0 to 2.1 seconds.
Skip this test if your DGP model does not include this function. This function is not available
on DGP***ABA model relays.
NOTE
1. Make the following Settings changes:
81-4U
(2003) SET PNT = 60
(2004) TL11 = 2
2. Connect relay as shown in Figure 4–8: STANDARD FUNCTIONAL TEST CONNECTIONS on page 4–26.
3. Set up relay in test mode for the 81-4U function; 81-4U ON will be displayed on the MMI.
4. Set all current inputs to 0. Using a 61 Hz source, set the voltage inputs to:
VA = 70 V rms ∠0°,
VB = 70 V rms ∠–120°,
VC = 70 V rms ∠–240°.
5. Verify that test pickup and test trip do not operate.
6. Change the frequency of the voltage inputs to 59 Hz.
7. Verify that test pickup operates immediately and test trip operates in 2.0 to 2.1 seconds.
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DGP Digital Generator Protection System
4 ACCEPTANCE TESTS
4.7.18 T21: UNDERFREQUENCY UNIT #3 81-3U
4.7.19 T22: UNDERFREQUENCY UNIT #4 81-4U
GE Power Management