One of our gas turbine generator unit "1st stage rotor
ground fault" alarm was occured several times. we tried to
measure some voltage vulue ground fault protection relay
(UNS3020a made by ABB and we measured the value of:
Ground: 0.9VDC
5V: 5.8VDC
24V: 23VDC
u+: 300 – 350mVAC
Rf1: 17.5mVAC
Rf2: 17.6mVAC
The unit still running and the alarm was reset. As of 6pm
yesterday and unitl now no alarm happened again. I our
protection relay was defective?
Answer / yvb
Stage 1 Alarm is only Alarm...Stage II is trip..so your
system working Ok...
Is This Answer Correct ? | 0 Yes | 0 No |
ADVANTAGES OF DIGITAL COMMUNICATION OVER ANALOG.?
What is the difference between Busbar Chambar, MCCB board and MCB Board? How to choose to use which one in the system?
what is the diff. b/w restricted earth fault relay & standby earthfault relay and where they are used?
4 Answers KSK Energy, Reliance,
how to select electronic timer(Star-Delta) setting for diff. rating motors
0 Answers Getrag Ford Transmissions,
what is the meaning of x,m,k in the relays?
Which colour of earthing wire
If 11 KV breaker on the primary side of a 11 KV/3.3 KV 12.5 MVA transformer can be installed at a distance of 1000 mtrs through a 11 KV cable. If no what are the probable reasons.
Define maximum demand?
why does the magnetic balance tests at transformers? how to provide earthing in flight?
how to calculate mf when meter and cTPT detail are given
1.differance between onload ups and off line ups.
what are the energy savings methods that are existing in coal based power plant?