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Attached is a sketch of the plan view with some rough lengths. the spikes are because the tension feedback is via a comms link and not hardwired. We have verified that the spikes are not actually occuring. We are hardwiring the feedbacks next...

Hello All, We have several conveyors onsite which have a takeup winch to keep the belt tension is a specific band. We get the feedback from a strain guage at the fixed end of the rope and a load pin on the pully closest to the take up winch drum. These two tension feedbacks are averaged which...

starting of such a big motor, even with a soft starter would drop your bus voltage abit. your other transformer might experience greater current depending on its load, which might contribute to the fault. seems like a transient voltage or sheer luck would be the more probable causes

They are outdoor transformers but degradation over time has lead to the water ingress. Its definately water ingress as we can see the water trails. Regular maintenance of our transformers is whats letting us down most, we are on a mite site and our HV maintenance is only reciently starting to...

Hello all, On my site we are looking at installing silica breathers at the bottom of our transformer HV terminal boxes. We have had a few failures where water has ingresed into the terminal box and caused a flashover. The concept is that the breather at the bottom will let any water/moisture...

The motor was tested after the first two failed started but before the last one we had a few days ago. The plant was installed around 2002, this motor was changed out around 2 years ago. We have had three failed starts, but other than that we havent had any other problems with this motor. Im...

I agree with david and your comment, i would set your CB up to protect your cable and load, and not worry about co-ordination. Co-ordination is meant to help you, you wont be helped if you have to go and find fuses every time it trips! I would definately leave the fuse there in case it is...

Thanks for your posting electricpete, you have obioulsy put alot of time and effort into your above postings its a 6-pole machine. 20% does seem exsessive to me also. I just did a quick simulation through PTW and at 5 times FLA it predicts 21% voltage drop for our system. For a normal start...

The rotor connections have been tested with the results attached, there is some small variences but we believe they are within tolerance. We havent done an internal tank inspection as yet. I have attached the multilin waveform capture which captues the end of the last event, it shows stator...

We have a 11kV, GEC, 6.5MW motor which is connected via a gearbox and pinion to a ball mill. The motor is soft started by a LRS. About a year and a half ago, April and again now yesterday the mill has gone for a start and has sat there not turning. It has sat there pulling 1800A until the...