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| Analysis of typical transformer fault cases based on three ratio method |
| LIN Beimin |
| Guangxi Liuzhou Guiliu Hydropower Co., Ltd, Liuzhou, Guangxi 545200 |
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Abstract Preventing transformer failures is an important technical challenge, especially to prevent heavy gas faults in transformers. Internal faults in transformers can be determined by analyzing the dissolved gas components in transformer oil. This paper uses the three ratio method to analyze the fault of a 110kV transformer, accurately determines the cause of the malfunction and proposes relevant counter measures, avoiding fault escalation. The cause of a heavy gas fault in a 220kV transformer is analyzed, and the safety hazards left by insufficient insulation design margin and incomplete major repairs are revealed. It can be used as a reference case for fault diagnosis of oil immersed transformers.
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Received: 04 September 2023
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2023, Vol. 24 
