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Zhao J.-B.,Henan Pingdingshan Power Supply Company | Xiao C.-Q.,Henan Pingdingshan Power Supply Company | Wang Y.-S.,Henan Pingdingshan Power Supply Company | Zhao Z.-Y.,Henan Pingdingshan Power Supply Company
Gaoya Dianqi/High Voltage Apparatus

This paper described the check, analysis and process for a complete shutdown accident of air-cooling unit of a forced oil circulation air-cooled 220 kV transformer, and analyzed the reason why the air-cooling unit with complete shutdown status failed to alarm. Moreover, the control circuit for automatic restart of the air-cooling unit and the circuit of delay tripping and start when the complete shutdown happens were modified, leading to the elimination of maloperation and misoperation of the secondary circuit in the transformer's air-cooling unit, and to the safe operation of the main transformer. Source

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