locating a shorted turn in field winding
locating a shorted turn in field winding
(OP)
Dear all,
Are you aware of a method of locating a shorted turn in the field winding of a turbogenerator? I don't mean to tell whether there is a shorted turn or not, but to physically locate it so you know which retaining ring you shold dismantle in order to fix it.
I remember an old timer from ABB claiming to be able to do so using an RSO test and a schematic of the field winding. It sounds feasible to me that, looking at the RSO curve and taking into account the speed of the wave, one could tell where the short is, but I've been asking around and it can't find anybody that can do it.
Also I've been google-ing a bit and found a description of a method which consisted of injecting and monitoring a current in the field winding, and then tapping all over the winding and watch for some change in the current. I don't really have more details on it.
Any experiences, opinions, suggestions, etc appreciated.
Thanks
Are you aware of a method of locating a shorted turn in the field winding of a turbogenerator? I don't mean to tell whether there is a shorted turn or not, but to physically locate it so you know which retaining ring you shold dismantle in order to fix it.
I remember an old timer from ABB claiming to be able to do so using an RSO test and a schematic of the field winding. It sounds feasible to me that, looking at the RSO curve and taking into account the speed of the wave, one could tell where the short is, but I've been asking around and it can't find anybody that can do it.
Also I've been google-ing a bit and found a description of a method which consisted of injecting and monitoring a current in the field winding, and then tapping all over the winding and watch for some change in the current. I don't really have more details on it.
Any experiences, opinions, suggestions, etc appreciated.
Thanks





RE: locating a shorted turn in field winding
RE: locating a shorted turn in field winding
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If we learn from our mistakes I'm getting a great education!
RE: locating a shorted turn in field winding
Is the RSO test similar to a TDR test? Would a TDR test give any useful information?
Thanks.
Bill
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"Why not the best?"
Jimmy Carter
RE: locating a shorted turn in field winding
Your idea makes sense although it is the first time I hear about using TDR for this. Maybe it would give some good information if we had first the signature of the 'healthy' field winding, and then repeat the test now that I'm sure that there is a short, and compare both results. But I'm just guessing...
Thanks, I will propose it to the manufacturer