GE DGP Series, Instruction Manual

Page: 148 / 278

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DGP Digital Generator Protection System GE Power Management
5.2 RELAY TESTS 5 PERIODIC TESTS
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5.2.3 T3: DIGITAL INPUT TEST
This test is used to check all digital inputs of the relay. It is a convenient way to determine proper system con-
nections and verify the operation of all dual optically isolated digital inputs. All digital inputs should be between
35 and 300 V DC.
Protection can be enabled or disabled, as deemed necessary by the user.
1. Connect the relay as shown in Figure 4–4: DIGITAL INPUT TEST CONNECTIONS on page 4–14.
2. Apply DC across digital input DI1 (BG8—BG7). Using the MMI and the INFORMATION–VALUES com-
mand, verify that GEN = OFF-LINE.
3. Remove DC from digital input DI1 (BG8—BG7). Using the MMI and the INFORMATION–VALUES com-
mand, verify that GEN = ON-LINE.
4. Apply DC across digital input DI2 (BG6—BG5). Using the MMI and the INFORMATION–VALUES com-
mand, verify that INLET VLV=CLOSED.
5. Remove DC from digital input DI2 (BG6—BG5). Using the MMI and the INFORMATION–VALUES com-
mand, verify that INLET VLV=OPEN.
6. Apply DC across digital input DI3 (BG4—BG3). Using the MMI and the INFORMATION–VALUES com-
mand, verify that DIG IN 3 = CLOSE.
7. Remove DC from digital input DI3 (BG4—BG3). Using the MMI and the INFORMATION–VALUES com-
mand, verify that DIG IN 3 = OPEN.
8. Apply DC across digital input DI4 (BG2—BG1). Using the MMI and the INFORMATION–VALUES com-
mand, verify that DIG IN 4 = CLOSE.
9. Remove DC from digital input DI4 (BG2—BG1). Using the MMI and the INFORMATION–VALUES com-
mand, verify that DIG IN 4 = OPEN.
10. Apply DC across digital input DI5 (BE4—BE3). Using the MMI and the INFORMATION–VALUES com-
mand, verify that OSC TRIG = CLOSE.
NOTE: This input is not active on some DGP models.
11. Remove DC from digital input DI5 (BE4—BE3). Using the MMI and the INFORMATION–VALUES com-
mand, verify that OSC TRIG = OPEN.
NOTE: This input is not active on some DGP models.
12. Apply DC across digital input DI6 (BE2—BE1). Using the MMI and the INFORMATION–VALUES com-
mand, verify that DIG IN 6 = CLOSE.
13. Remove DC from digital input DI6 (BE2—BE1). Using the MMI and the INFORMATION–VALUES com-
mand, verify that DIG IN 6 = OPEN.