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ljessop
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Joined: 26-December 08
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Last Seen: 27th December 2008 - 01:10 AM
Local Time: Mar 16 2010, 02:22 PM
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26 Dec 2008
Good morning/ evening all.
I have just recieved a call in regards to an asymmetry fault on an 11kV motor. We have low resistance tested the rotor {wound rotor with liquid resistance starter with power factor correction banks}. Checked all brush connections, inspected the 11kV circuit breaker and even tested the relay for the starter. The only thing that has not been done, is the star point on the HV motor lifted and tested the individual windings. My suspicion is that we have a shorted turn/s in the windings. We do not have the gear to turns/ratio test the windings available, but we have a spare motor. The power factor bank has been checked as well and is okay. Background: Suspected direct lightening strike during storm..... The assymetry fault has not been seen before, but I would suspect that the current is pulling back the voltage in one phase giving an imbalance. Need some input.............rapidly ! |
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Lo-Fi Version | Time is now: 16th March 2010 - 02:22 PM |
