Electrical Engineering XYZ MCQs
Which one of the following relays has the capability of anticipating the possible major fault in a transformer:
- Differential relay
- Buchholz relay
- Over fluxing relay
- Over current relay
Correct answer: 2. Buchholz relay
Explanation: The Buchholz relay is specifically designed to protect oil-filled transformers. It detects faults such as internal short circuits or arcing within the transformer by monitoring the gas and oil levels within the transformer’s oil tank. It can anticipate major faults by detecting abnormal conditions such as gas accumulation caused by internal arcing or overheating. When such conditions are detected, the Buchholz relay can trip the transformer offline to prevent further damage.
In summary, among the options provided, the Buchholz relay is the one with the capability to anticipate possible major faults in a transformer by detecting abnormal conditions within the transformer’s oil tank.