110 kV内桥接线变电站进线单相断线时主变故障特性分析

Analysis of Fault Characteristics of Main Transformer in 110 kV Substation with Internal Bridge Connection Induced by Single-phase Inlet Break

对一起110 kV内桥接线变电站进线发生单相断线故障造成主变跳闸案例进行分析,通过理论计算和波形分析相结合的方式,总结出单相断线时主变高、中、低压侧电压、电流幅值和相位的特征,为处理类似故障提供经验,同时还针对地区主变保护配置提出了改进建议。

This paper analyzes a case of main transformer tripping caused by single-phase break fault at the inlet line of 110 kV internal bridge connecting substation,and extracts the characteristics of voltage,current amplitude and phase at high,medium and low voltage sides of main transformer during single-phase break by combining theoretical calculation and waveform analysis.On the one hand,it provides experience accumulation for dealing with similar faults in the future,and on the other hand,it puts forward suggestions for improving the protection configuration of regional main transformer.