GE Power Management
DGP Digital Generator Protection System
4-
25
4 ACCEPTANCE TESTS
4.7 PROTECTION TESTS
4
5.
The following results should be obtained:
Test A
: Test pickup and test trip do not operate.
Test B
: Test pickup operates immediately and test trip operates in 1.00 to 1.04 sec.
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 B from the table above. Verify that the test pickup operates but the test trip does not operate.
8.
Remove DC from DI6 and all phase currents. Re-apply each phase current separately and verify that both
test contacts operate for each phase, as in step 5.
4.7.10 T13: ACCIDENTAL ENERGIZATION AE
1.
Make the following settings:
AE
(2703) AE ARM = AND (0)
51V
(1002) ALARM = 1000 (enable 51V function)
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 AE function; AE ON will be displayed.
4.
Using a 60 Hz source set the voltage inputs to:
VA = 29 V rms
∠
0°
VB = 29 V rms
∠
–120°
VC = 29 V rms
∠
–240°.
Set the current inputs according to the table below:
5.
Apply DC voltage across DI1 (BG8—BG7). Using the MMI and the INFORMATION–VALUES command,
verify that GEN = OFF LINE.
6.
Reduce the three-phase voltage to 29 V rms and verify that test pickup and test trip operate in 5 to 5.05
seconds (see the NOTE below).
7.
Remove DC from DI1 (BG8—BG7). Using the MMI and the INFORMATION–VALUES command, verify
that GEN = ON LINE. Notice that the test trip and test pickup drop out in 0.25 to 0.30 seconds.
8.
Change the voltage of all three phases to 29 V rms and change the following setting:
(2703) AE - ARM = OR (1)
9.
Verify that the test pickup and test trip operates in 5.00 to 5.05 seconds.
VA, VB, and VC must change from 70 V rms to 29 V rms with the source voltage continuously
on.
Table 4–4: CURRENT INPUTS FOR TEST T13
PHASE A
PHASE B
PHASE C
MAG.
PHASE
MAG.
PHASE
MAG.
PHASE
0.45 (0.09) A
0°
0.45 (0.09) A
–120°
0.45 (0.09) A
–240°
NOTE
Содержание DGP Series
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