JBS Enterprises Electrical Shift Engineer Interview Questions and Answers

Differential protection is a type of transformer protection that compares the currents entering and leaving the transformer.

• Differential protection is based on Kirchhoff's current law.

• If the difference between the currents is greater than a set threshold, the protection system will trip.

• This type of protection is used to detect internal faults in the transformer.

• Differential protection can be applied to both power and

Buchholz relay is a protective device used in oil-filled transformers to detect and prevent faults.

• It is installed in the oil-filled transformer tank.

• It detects the presence of gas or oil flow in the transformer oil.

• It trips the transformer if any fault is detected.

• It is a type of gas actuated relay.

• It is named after its inventor Max Buchholz.