What is Transformer Testing ?
What is Transformer Testing ?
Transformer test definition
Transformer testing involves various procedures to confirm the specifications and performance of the transformer before and after installation.
Transformer test type
Type test
Routine inspection
Special test
Transformer type test
In order to prove that the transformer meets the customer's specifications and design expectations, the transformer must undergo different test procedures at the manufacturer's site. Some transformer tests are performed to confirm the basic design expectations of the transformer. These tests are carried out primarily in prototype units rather than in batches across all manufacturing units. The type test of the transformer confirmed the main and basic design criteria of the production lot.
Transformer type test type
Transformer winding resistance test
Transformer ratio test
Transformer vector group test
Measurement of impedance voltage/short-circuit impedance (main tap) and load loss (short-circuit test)
Measurement of no-load loss and current (open circuit test)
Measurement of insulation resistance
Dielectric testing of transformers
Transformer temperature rise test
Test of on-load tap-changer
Vacuum testing of tanks and radiators
Routine testing of transformers
Routine testing of transformers is mainly used to confirm the operational performance of individual units in a production batch. Routine testing is performed on each unit manufactured.
Conventional test types for transformers
Transformer winding resistance test
Transformer ratio test
Transformer vector group test
Impedance voltage/short-circuit impedance (main tap) and load loss measurement (short-circuit test)
Measurement of no-load loss and current (open circuit test)
Measurement of insulation resistance
Dielectric testing of transformers
Test on an on-load tap-changer.
Perform an oil pressure test on the transformer to check for leaks in joints and gaskets
Special testing of transformers
Perform special tests on transformers according to customer requirements, providing valuable information for operation and maintenance.
Special test types for transformers
Dielectric test
Measurement of zero sequence impedance of three-phase transformer
Short-circuit test
Acoustic Measurement of noise levels
Measurement of no-load current harmonics
Measure the power consumed by the fan and oil pump
Test purchased components/accessories such as buchhloz relays, temperature indicators, pressure relief devices, oil retention systems, etc
Sum up
Transformer testing is an important means to ensure the safe operation of transformers, including type test, routine test and special test. The specific test items include variable ratio test, winding resistance test, short circuit impedance test, on-load tap-changer test, no-load test, dielectric loss test, sweep frequency response analysis, etc. In addition, there are insulation testing, coil on-off detection, no-load current and voltage detection, temperature rise test. Through these tests, the performance and status of the transformer can be comprehensively understood, potential problems can be discovered and dealt with in time, and the safe and stable operation of the transformer can be ensured.
