how to check the capacitor value

[mannumss]

WE HAVE CAPACITOR BANKS FOR SVC ( STATIC VAR COMPENSATOR )AND USING THE CAPACITORS BANK IN 100HZ,150HZ,200 HZ, 250 HZ FILTER. CAPACITORS ARE SERIES PARALLEL CONNECTED.. ALL CAPACITORS CONNECTED TO 33 KV NETWORK, BUT HOW TO CHECK THE CAPACITORS IF ANY FILTER UNBALANCE WHILE CAPACITOR CONNECTING, IS THERE ANY METHOD TO CHECK CAPACITANCE VALUE OF TOTAL CAPACITORS OF INDIVIDUAL PHASE CONNECTED, BECAUSE IT IS VERY DIFFICULT TO CHECK EACH AND EVERY CAPACITOR OF BANK AND TIME TAKING JOB. THANK U

 

[Skogsgurra]

Try to avoid all capital letters. That will make your posts more readable. It might even increase the possibility to get an answer.

Gunnar Englund

http://www.gke.org

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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...

 

[Skogsgurra]

Do you want to check the banks in operation? I think that you shall forget about that if you don't have separate CTs and VTs installed for each filter and capacitor bank.

If you can deenergise the filters, then it will be a lot easier. You can check the capacitance values easily by applying a suitable voltage, 400 or 480 V at 50 or 60 Hz and measure voltage across and current through every capacitor section. Then calculate C=I/(6.28*f*U)

You do not need to separate the different filter sections from each other, which I have seen people doing, because you measure U and I for each capacitor section and can ignore what is going on in other parts of the filter.

One thing that you may have to be careful with is if you have a harmonics-rich voltage. Then it may be necessary to measure the fundamental U and I using a spectrum analyser or selective voltmeter and current meter. Otherwise you may get the wrong values.

Gunnar Englund

http://www.gke.org

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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...