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Ten key points for daily maintenance of transformers in operation
Published on.
2023-09-20
Transformers require regular maintenance during operation. We adhere to the "look, listen, smell, touch, and measure" five-point principle for meticulous inspection. What specific inspection items are involved?
I. External Surface Cleanliness: The transformer surface should be free of dirt accumulation.
II. External Insulator Bushings: The external insulator bushings should be clean, free of significant oil stains, intact without damage, cracks, corona discharge, or flashover phenomena.
III. Listening for Sounds: During normal operation, transformers typically produce a uniform "humming" sound due to core vibration caused by alternating magnetic flux. There should be no crackling discharge sounds or irregular noises.
IV. Oil Color and Level in the Conservator Tank: All parts should be free of oil leaks or holes; the oil in a normal transformer should be transparent and slightly yellowish. A reddish-brown color may indicate oil degradation or contamination of the oil level gauge itself.
V. Upper Oil Temperature: The upper oil temperature should generally be below 85℃. A sudden increase in oil temperature may indicate a cooling system malfunction or an internal transformer fault. For oil-immersed self-cooled transformers, a significant temperature difference in the heat dissipation device may indicate a blockage in the pipes.
VI. Lead Connection and Contact Condition: All lead connections should show no discoloration or overheating. The temperature indicator wax on the connection should not be melted. Using a non-contact infrared thermometer, the temperature at the connection point should not exceed 70 degrees Celsius.
VII. Explosion-Proof Device: The safety vent and explosion-proof membrane should be intact without cracks or oil accumulation. The indicator rod of the pressure relief valve should not be protruding, and there should be no oil spray marks.
VIII. Gas Relay: The gas relay should be completely filled with oil and free of gas. The connecting valve between the relay and the oil cushion should be open.
IX. Grounding Wire Reliability: Using a clamp-type ammeter to measure the current of the core grounding wire, the value should not exceed 0.5A.
X. Tap Changer Position: The positions of all tap changers should be consistent.
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