Ultra-high voltage autotransformers are the key to power transmission systems.
When the transformer is running for several years, its internal coils may be loose, which increases the sensitivity of the transformer to accidents in the event of a system failure. This large area (large part) failure can cause catastrophic losses to the transformer. Each transformer will cost $1 million and take weeks or months or even a year to repair or redo a new transformer. Therefore, pre-maintaining transformer maintenance is the key to maintaining its normal operation.
Regular internal maintenance, including opening the transformer, extracting the transformer oil, and sending people to check the coil. This is a costly repair that shuts down the transformer for a few weeks. In the past, repairs were carried out based on the presumed faulty parts of the transformer, so it is impossible to carry out an all-round inspection of the transformer, which inevitably leaves a potential danger.
External diagnostics can be very helpful in detecting potential problems with transformers. It makes it easier to determine the operation of the transformer and to repeatedly monitor changes in various parts. The information provided by this monitoring also helps to increase reliability.
New low-cost external detection technology can determine whether the internal condition of a transformer is good. The test contents include frequency response analysis, recovery voltmeter measurement, vibration test, partial discharge test of acoustic wave, oil test and infrared phase inspection.
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