Hi All:
I saw some exciter Manu.s have some document show their static exciters have +/-0.2% voltage regulation accuracy - regulate the generator terminal voltage. Let's say typically, 13.8kV, so 0.2% will be +/-27.6V. Can any brand of exciters regulate the generator terminal voltage within...
Hi All:
I am not a field service engineers or testing engineers so I have no ideas how long it will take a typical distribution LTC transformer (230/138/66 down to 12/25kV level) tap move from neutral position to the maximum boost tap position assuming 5 taps up and 5 taps down.
I read some...
Hi:
I am not a protection guy. I know if the line series compensations go beyond 50% the distance relay may mis-operate due to the possible negative impedance (Or out of the cycle).
Differential relay is preferred. However, our 500kV system uses microwave not fiber. So one of my friends told me...
I know there are some threads talking about circuit switchers. But what the problems is that our Chief engineer said CS is not designed to interrupt fault currents therefore, can not be used to clear a fault which I believe it is B.S.
Since we have a 66kV line from a system substation A...
In the company I work, we used to have a case that in a weak system (138kV extising and 230kV ultimate) with fault level only 110MVA we plan to install two 120MVA auto transformers 230/138/25kV. I had a concern for transformer inrush current and teh impact to the distribution loads along the...
I open this thread is to get any fresh ideas. It is not necessary professional ones.
I always seek what the future power system look like. After 50 years or 100 years when we all gone.
Power system engineers stop working on UEHV long time ago and personally I don't think UEHV will be ultimate...
Does anybody know if possible by only looking at the number of the insulators on the transmission tower can roughly tell the voltage level. for example, based on the number of the insulator we can tell the transmission tower is for 66kV,138kV or 230kV. 500kV is easy to tell with the bundled...
Hi All:
I am not sure my last post got through or not so I write it again.
I would like to know that will it be a big jump on the cost if we require a 500MW generator has a 0.9lagging power factor instead of 0.95lagging one? Will the improved the cooling system or field winding /rotor winding...
