How does the load test run of the transformer work?

When conducting a load test for transformers, the transformer can proceed to the load test phase only if there are no abnormalities during 24 hours of no-load operation. The specific operational steps are outlined below:

(1) Gradual Load Increase: Initiate the operation with a 25% load, gradually increasing it to 50%, 75%, and finally reaching full-load testing. Throughout this process, it is essential to ensure that there is no leakage of oil from the seals and weld seams.

(2) Cooling System Activation: As the transformer temperature rises during load testing, a certain number of cooling systems should be gradually activated.

(3) Test Duration: The load test duration should commence from reaching full load and last for 2 hours.

(4) Inspection under Normal Conditions: In the course of load testing, especially during full-load testing, the load test work can be concluded only when the transformer body, various components, and accessories are all confirmed to be in normal condition.

(5) Considerations for New Transformers: For newly loaded transformers, inspection frequency should be increased, with simultaneous attention to oil temperature. If the temperature exceeds 45K, an immediate signal should be issued.

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