变压器5次谐波的产生及其对负序电压继电器的影响

The Fifth Harmonic in Power Transformer and Its Influence on Negative - Sequence Voltage Relay

文章针对长春榆树变电站、五棵树变电站负序电压继电器频繁误动的现象进行了测试分析,同时结合时空载电力变压器的升压试验及负序电压继电器的谐波干扰测试分析,得出了造成榆树变电站、五棵树变电站负序电压继电器误动的原因是变压器因运行电压偏高,致使变压器铁心过饱和产生的5次谐波,最后提出了措施与建议。

This piper analyzes the frequent maloperations of negative - sequence voltage relay in Yushu and Wukeshu substations in Changchun. At the same time, combined with the analysis of step - up test for no load power transformer and the harmonic disturbing test for negative - sequence voltage relay, the reasons for the maloperations of negative - sequence voltage relay are found that the operation voltage of transformer is higher to make the transformer core over - saturated to produce the fifth harmonic. Finally, the suggestions and measures are put forward.