What is Buchholz relay?
Buchholz relays are generally used to sense abnormal conditions occurring inside a transformer. It is a type of oil and gas actuated protection relay. It can be seen in all oil immersed transformers having a rating more than 500 kVA. In order to reduce the manufacturing cost, Buchholz relays are not provided in transformers having a rating below 500 kVA.
Why is Buchholz relay used in transformers?
