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4.7 PROTECTION TESTS
1. Make the following Settings changes:
40
(501) SELV2SUP = DISABLE (0)
40-1
(603) CENTER = 11 (55)
(604) RADIUS = 8.5 (42.5)
(605) TL12 = 0.06
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 40-1 function; 40-1 ON will be displayed on the MMI. Using the MMI and
the INFORMATION–VALUES command, verify that DIG IN 6 (EXT VTFF) = OPEN.
4. Using a 60 Hz source set the voltage inputs to:
VA = 35 V rms ∠0°,
4
VB = 35 V rms ∠–120°,
VC = 35 V rms ∠–240°.
Set the current inputs according to the Table below.
Table 4–2: CURRENT INPUTS FOR TESTS T8 & T9
TEST
A
14.5 (2.9) A
B
12.5 (2.5) A
C
1.7 (0.34) A
D
1.9 (0.38) A
5. The following results should be obtained:
Tests A & C : Test pickup and test trip do not operate.
Tests B & D : Test pickup operates immediately and test trip operates in 65 to 85 ms.
6. Apply DC voltage across DI6 (BE2—BE1). Using the MMI and the INFORMATION–VALUES command,
verify that DIG IN 6 (EXT VTFF) = CLOSE.
7. Repeat Test D from the above table and verify that the test pickup and test trip do not operate.
8. Remove DC from DI6 (BE2—BE1). Using the MMI and the INFORMATION–VALUES command, verify that
DIG IN 6 (EXT VTFF) = OPEN.
9. Change the following setting:
(501) SELV2SUP = ENABLE (1)
10. Set VA = 50 V rms ∠0°, IA = 2.7 (0.54) A rms ∠90°, and all other AC sources to 0 V. Verify that the test
pickup and test trip do not operate.
4-
22
PHASE A
MAG.
PHASE
90°
90°
90°
90°
DGP Digital Generator Protection System
4.7.5 T8: LOSS OF FIELD PROTECTION ZONE 1 40-1
PHASE B
MAG.
PHASE
14.5 (2.9) A
–30°
12.5 (2.5) A
–30°
1.7 (0.34) A
–30°
1.9 (0.38) A
–30°
4 ACCEPTANCE TESTS
PHASE C
MAG.
PHASE
14.5 (2.9) A
–150°
12.5 (2.5) A
–150°
1.7 (0.34)A
–150°
1.9 (0.38) A
–150°
GE Power Management
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