GE DGP Series, Instruction Manual

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GE Power Management DGP Digital Generator Protection System C-
1
APPENDIX C C.1 DGP FAQ
C
APPENDIX C DGP FAQC.1 DGP FAQ C.1.1 FREQUENTLY ASKED QUESTIONS
1. Why does my DGP display a "351" error code?
The current inputs INS and INR are derived from the residual connections of the respective phase CTs and do
not require dedicated neutral CTs. Zero-sequence current at system and/or neutral side of the generator stator
windings is calculated and compared with the measured INS and/or INR values by the DGP as part of a back-
round self-test. If they do not match, a 351 error code is generated.
2. Why can't I get the 27 function (undervoltage) to operate?
The 27 element operates when the generator is considered on-line. The DGP recognizes the on-line status DI1
"Generator Off-Line". An Auxiliary b contact will allow the DGP to interpret the correct generator status.
3. How do I order replacement parts for my DGPs?
The following table shows the replacement part numbers and their availability for the DGP:
4. I have an older version of DGPxxxAAA firmware. What upgrade kit do I order to upgrade my
DGPxxxAAA to the latest firmware revision?
Use kit 0355A3489G0001.
MODULES DGPxxxAAA DGPxxxABA DGPxxxACA
SSP301
4 4 4
ANI301
4 4 4
DAP201
4 4 4
DSP401
4 4 4
MGM781 - specify 1A or 5A
4 4 4
MMI301
4 4 4
0215B8070G0004
4
48 V DC
4
48 V DC
4
48 V DC
0215B8070G0004
4
125 V DC
4
125 V DC
4
125 V DC
0215B8070G0004
4
250 V DC
4
250 V DC
4
250 V DC
DIT 103
4
DIT 101
4
DIT 102
4
UNDERVOLTAGE (1)
GEN.
OFF-LINE
+
DI1
A N D
27