What is the Transformer Temperature Rise Test according to IEC 60076-2:2011?
The Temperature Rise Test specified in IEC 60076-2:2011 is a routine type test used to verify that a power transformer can operate safely under rated load without exceeding the permissible temperature limits.
The test evaluates the heating performance of the transformer windings and insulating materials under normal operating conditions.
Purpose of the Test
The primary objective of the temperature rise test is to confirm that the transformer’s top-oil temperature rise and winding temperature rise remain within the limits specified by IEC 60076-2:2011. This ensures reliable operation, prevents insulation deterioration, and extends the transformer’s service life.
Test Procedure
During the test, the transformer is energized and loaded at its rated current until thermal equilibrium is achieved.
The top-oil temperature is measured directly, while the winding temperature is determined using the resistance method immediately after the load is removed.
The measured values are then compared with the allowable temperature rise limits defined in the standard.
Importance
Conducting the Temperature Rise Test helps manufacturers and users verify the thermal performance of the transformer ensuring compliance with IEC standards, improving operational reliability, and reducing the risk of overheating-related failures in service.