Self-consumption of voltage transformer
Self-consumption of voltage transformer
(OP)
One of site tests of voltage transformers required here is transformer ratio. For MV transformers it is not a problem, but starting with 110 kV and up it is hard to perform this test using 220 V for supply of primary winding. Transformed voltage on secondary side is too low to be measured with enough precision.
We are going to order step-up transformer 220 to 1500 V, but I wonder about the necessary power. Actually I have no idea how much would be self-consumption for example of a typical 110000/100 V voltage transformer. For capacitive VT's it is easy to calculate, because data of the capacitive voltage divider are available, but I have no idea about inductive ones.
Also typical data for 220 and 400 kV VT's will be helpful.
We are going to order step-up transformer 220 to 1500 V, but I wonder about the necessary power. Actually I have no idea how much would be self-consumption for example of a typical 110000/100 V voltage transformer. For capacitive VT's it is easy to calculate, because data of the capacitive voltage divider are available, but I have no idea about inductive ones.
Also typical data for 220 and 400 kV VT's will be helpful.
------------------------
It may be like this in theory and practice, but in real life it is completely different.
The favourite sentence of my army sergeant






RE: Self-consumption of voltage transformer
RE: Self-consumption of voltage transformer
RE: Self-consumption of voltage transformer
------------------------
It may be like this in theory and practice, but in real life it is completely different.
The favourite sentence of my army sergeant
RE: Self-consumption of voltage transformer
Have a testing company that does transformer testing for a living come test it for you, dosent cost much. You can find one near you at www.netaworld.org
RE: Self-consumption of voltage transformer
RE: Self-consumption of voltage transformer
RE: Self-consumption of voltage transformer
Actually I cannot see much sense in field checking of TTR of voltage transformers. The possibility for wrong ratio is very small if we have factory test sheets at hand. But it is required by the authorities in our country.
Site check of TTR for current transformers is necessary, specially for these with several primary taps. It helped me several times to find wrong primary re-connection before to energize the bay and find zero sequence current in secondary circuits.
------------------------
It may be like this in theory and practice, but in real life it is completely different.
The favourite sentence of my army sergeant
RE: Self-consumption of voltage transformer
I agree. However, as a manufacturer of VTs, you wouldn't believe how many calls we field from people that think they have problems with high voltage VTs because the ratio measured with a TTR is slightly off from nameplate. I finally had to write a technical bulletin on the subject just so people would believe me. It's amazing...I can tell someone something over the phone and they won't believe me. I can write it on a piece of paper and they'll not question it :)
RE: Self-consumption of voltage transformer
Im fully agree with you!!!!!
Best Regards.
Slava
RE: Self-consumption of voltage transformer
------------------------
It may be like this in theory and practice, but in real life it is completely different.
The favourite sentence of my army sergeant