CCVT/CVT Testing

[scottxclark]

Can any of you tell me what test set or method you are using for testing turns ratio on CCVTs? Are you guys applying a high voltage to the high voltage terminal, and measuring the secondary, or are you using a test set? My understanding is a standard TTR test set will record too high of an error due to the voltage decay in the capacitor stack. Vanguard's CTV-765 seems like a simple and fast test set. Any feedback is appreciated. Thanks!

[Sanjayo]

Most simple method I think is using a power factor test set as a power supply to the HV terminal and measure the secondary voltage.

[lester mcmanaway]

Most simple method I think is using a power factor test set as a power supply to the HV terminal and measure the secondary voltage.

totally agree with Sanjayo, just did some a few months back, 80kv-120v I believe. we put 10kv on the high side with our omicron cpc100/td1 and measured 15v on the low side

[randywright]

Could you use an AC hipot if you don't have a power factor set?

[lester mcmanaway]

Could you use an AC hipot if you don't have a power factor set?

Never tried that... not sure honestly. I don't see why not.

[randywright]

Hipots usually trip out on very low levels of current.

Never tried that... not sure honestly. I don't see why not.

[lester mcmanaway]

Hipots usually trip out on very low levels of current.

Very true. Yep, not likely you would be able to use a hipot. Good call. Depending on the ratio, I've used just a small power source.

[trn8ochaser]

I personally use an M4100 to apply 10kV to the top and measuring at the bottom with a voltmeter. However, this will either be at 57 or 63 Hz, which I've recently been concerned about effecting the accuracy.

[NWILLJR1020]

Can any of you tell me what test set or method you are using for testing turns ratio on CCVTs? Are you guys applying a high voltage to the high voltage terminal, and measuring the secondary, or are you using a test set? My understanding is a standard TTR test set will record too high of an error due to the voltage decay in the capacitor stack. Vanguard's CTV-765 seems like a simple and fast test set. Any feedback is appreciated. Thanks!

We use a DOBLE M4000 power factor test set

[wooddy]

I personally use an M4100 to apply 10kV to the top and measuring at the bottom with a voltmeter. However, this will either be at 57 or 63 Hz, which I've recently been concerned about effecting the accuracy.