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Participant

Join Date: Jul 2012
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Capacitor Problem in Case of Service Restoration?

07/10/2012 7:39 AM

Hi everyone,

I have a question regarding capacitor banks.

Suppose you place a capacitor on a 10 KV meshed network, that is being radially operated. Now, when there is some kind of disturbance/failure that leads to service restoration. Is your bank gonna overcompensate or cause any harm to customers?

Hope you understand the problem.

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Guru
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#1

Re: Capacitor Problem in Case of Service Restoration?

07/10/2012 8:01 AM

If the capacitor is there to tune-out the reactive currents in the feeder upstram of it, then it shouldn't have much effect elsewhere unless it remains in-circuit with the fed equipment on that feeder out-of-circuit on power-up. Even then, it won't do any harm.

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Participant

Join Date: Jul 2012
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#2
In reply to #1

Re: Capacitor Problem in Case of Service Restoration?

07/10/2012 8:17 AM

thank you ....that is exactly what i concluded from a few simulations. However, how can you prove it mathematically?....another question , suppose you use the "1/2KVar rule" suggested by grainger/lee which states that the capacitor must be placed optimally on a point where the var are equal to half the capacitor rating. With the intention to produce half of Kvar requirement upstream and half downstream. If i understood this , you will always overcompensate with this rule?or am i looking at this the wrong way.........

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Participant

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#3
In reply to #2

Re: Capacitor Problem in Case of Service Restoration?

07/12/2012 11:44 AM

simpler question: At what extent does a fixed capacitor cause overvoltages?are overvoltages a direct result of overcompensation?

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