What is the purpose of a DMCR protection relay for an oil transformer?

The purpose of a DMCR protection relay for an oil transformer is to monitor and protect the transformer from internal faults. DMCR stands for Differential, Magnetic, Current, and Resistance, which are critical parameters assessed by the relay. It detects discrepancies in current between the transformer’s windings, ensuring rapid response to faults, thereby preventing damage and maintaining operational integrity of the oil transformer.