Analysis of Reasons for Multiple Abnormal Opening and Closing of Transformer During Power Transmission
This paper analyzes the repeated opening and closing events of the circuit breaker after the relay protection action when the high-voltage side of the transformer in a power plant is closed due to a three-phase short circuit fault.According to the on-site monitoring and recording data,the high-voltage side circuit breaker of the transformer did not stop the closing operation after causing the protection action to trip due to closing,and then continued to close,resulting in the above phenomenon occurring four times in a row,ultimately causing serious equipment damage.Analyzed and summarized the electrical quantity and temporal characteristics of overcurrent during the accident,providing support for quickly locating the nature of faults.Provide reasonable handling measures based on this incident,effectively avoiding the recurrence of this type of accident.
transformerrelay protectionabnormal opening and closing action
NETL
NSTL
万方数据
