A transformer is an extremely important electrical equipment in the transmission and distribution system, but due to various reasons, it sometimes fails during operation. According to the nature of the maintenance work, transformer maintenance is divided into major repair and minor repair.
It is customary to overhaul the oil-immersed transformer where it needs to drain the oil core (or hang the bell cover) for maintenance, if there is no need to drain the oil, do not hang the core (hang the bell cover), only overhaul or oil replenishment externally, and carry out oil treatment is called minor repair.
1. Conventional transformer overhaul process
When the results of the electrical test and oil test show that the results are unqualified, it is necessary to carry out overhaul, and judge whether the transformer has the conditions for core inspection according to the on-site conditions, and then carry out relevant maintenance operations.
In addition to this reason, a hanging cover inspection is required in the following three situations:
1. The transformer is generally inspected within 5 years after it is put into operation.
2. When the main transformer running in the power system is subjected to the outlet short circuit, it can be considered to be overhauled in advance after comprehensive diagnosis and analysis.
3. When the transformer in operation is found to be in abnormal condition or has internal faults after testing, it should be overhauled in advance.
Second, the transformer overhaul project
Third, the overhaul site conditions
Fourth, the overhaul process
Remove the lead → electrical, oil backup test, insulation judgment→ part of the oil drain, disassemble the accessories and overhaul→ drain the oil and deal with it, remove the tap changer connector→ the hanging bell (body) body inspection, overhaul and test the insulation → if it is damp, dry it→ fill the oil according to the specified oil injection method→ install the casing, cooler and other accessories→ seal test→ oil level adjustment→ electrical and oil test → end
5. Transformer overhaul overhauls all components
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