Power Transformer Bucholz operation
Power Transformer Bucholz operation
(OP)
We have recently repaired(rewound)a 1 MVA,22kV to 6.6Kv,3 phase power transformer. After energising it, it came out on bucholz three times within a space of a month.A DGA test proved that everything is normal.
What could be wrong or what am I missing?
Govender1






RE: Power Transformer Bucholz operation
1)Release of air trapped inside the transformer.
2)Sudden drop in atmospheric tmperature or sudden drop in
tmperture with a choked breather.
3) Vibration of b'relay.
After operation,if thereis gas found in b'relay points to a faulty circuit.
RE: Power Transformer Bucholz operation
RE: Power Transformer Bucholz operation
Reference:
A. R. van C. Warrington "Protective Relays Their Theory and Practice," Volume I, Chapman & Hall Ltd., 1971,
Section: 10.3.1. Buchholz Relays on page 382 addresses subtleties of Buchholz relays. There might be pinhole leaks in the relay.