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Greetings, We have GE frame five gas turbines and we are suffering from intermittent 125 VDC ground. The DC ground is existed as long as the turbine is running, as soon as soon the turbine is down the ground disappeared. Sometimes the ground is going on and off while the turbine is running...

Greetings, We have GE frame five gas turbines and we are suffering from intermittent 125 VDC ground. The DC ground is existed as long as the turbine is running, as soon as soon the turbine is down the ground disappeared. Sometimes the ground is going on and off while the turbine is running...

Thank you all for your valuble inputs.

Thank you all, The reason I asked the question is that I'm working in an Oil Refinery and all of our motors are TEFC. Yet, we've noticed that during heavey rain water passed into the motor. This is was happened mostly to the motors that have re-winded motors or motors that their casings were...

Hi Motorsdirect, Thanks for your inputs. What I meant is that, in case you have to re-winde a Totally Enclosed Fan Cooled motor, then after the repair, how could you make sure that the motor is still TEFC???

Greetings, In our plants there are a lot of TEFC motors. Whenever one of those motors get shorted, we used to send over to a local shop for re-windings. The re-windings are OK but I was thinking would the motor be as it was before the re-windings as TFEC??? Is there any test or procedures to...

Thank you all for your inputs. The reason I was looking for the Vecotr Groups is that I'm facing a proplem in my work. We have built a new Centeral Control Room that shall be feed through new substation. The new substation (S/S M) is a duble ended, with two feeders from two different sources and...

Guys, I've been searching the net for a full description of all vector groups for power transformer without success. I've got one site with some of the group and a daigram showing the difference but not all of them. Dose any body aware fo such site?? Thanks

The power system in the refinery I work in is 50Hz system, while the system in the country is 60Hz. This is due to the fact that we generate our own power without any contribution from the utility company. My question is that, due to the diffecalities in finding a small 50 Hz motors, a...