A transformer protection relay is a device used to monitor and protect power transformers from various faults and abnormal conditions. Its primary function is to detect faults promptly and isolate the transformer from the power system to prevent damage and ensure the safety of personnel and equipment.
![]() |
| Fig. Basic Idea of a Differential Relay |
Transformer Protection Relay and Its Working Principle
The protection relay works by monitoring various electrical parameters of the transformer and initiating appropriate actions when predefined thresholds or abnormal conditions are detected.


