Abstract
The production principle of characteristic gas in transformer oil and its corresponding transformer fault type are discussed in this paper. Aiming at the fault of multiple characteristic gases exceeding the standard in a 110 kV transformer oil, this paper analyzed the fault reasons according to the characteristic gas method and the three-ratio method, and combined with relevant tests, it was judged that the transformer core multiple grounding fault caused the fault. The on-site inspection verifies the correctness of the failure analysis results and the corresponding measures were adopted to eliminate the transformer faults.
Highlights
Transformer oil is widely used in electric equipments such as transformers, reactors and transformers
The characteristic gas components of different transformer faults are different, and the fault type can be judged by table 1
The types and concentrations of various characteristic gases in transformer oil are closely related to the internal faults of the transformer
Summary
Transformer oil is widely used in electric equipments such as transformers, reactors and transformers. Transformer oil is the main insulation of oil-immersed transformer. The latent fault of transformer can be found by chromatographic analysis of dissolved gas in transformer oil. Partial overheat and partial discharge will cause the breakdown of transformer oil and solid insulation, which will produce gas. When the content of the characteristic gas in the transformer oil exceeds the specified attention value, Follow-up analysis should be performed. The character and type of fault can be determined by the method of characteristic gas judgment. Guide for analysis and determination of dissolved gases in transformer oil.[1] When the concentration of some characteristic component gases in the running transformer oil reaches a certain value, for example, φ(C1+C2)>150μL/L or φ(C2 H2)>5μL/L or φ(H2)>150μL/L, attention should be paid to the transformer. We need to combine the historical data to synthetically judge the running state of the transformer. [2]
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