某电厂电流互感器二次反接致误跳闸分析
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摘要
通过对电流互感器二次回路反接导致线路差动保护误动作的异常现象进行详细的分析,并经过数据计算模拟故障发生的情况,查清了相序反接后,厂用变投运不跳闸而引风机启动瞬间跳闸的原因,并得出电流互感器二次回路改动的注意事项,一是保护装置要接在测量仪表之前;二是差动保护投运前要进行负荷试验。
A case of line differential protection malfunction caused by reverse connection of secondary circuit was analyzed in this paper. It was simulated the occurrence of the fault. When the phase sequence was reversed, the reasons for instantaneous tripping of the induced draft fan was identified. The precautions for the change of the secondary circuit of the current transformer are obtained.Firstly, the protection device should be connected prior to the measuring instrument; secondly, the load test should be carried out before the differential protection is put into operation.
A case of line differential protection malfunction caused by reverse connection of secondary circuit was analyzed in this paper. It was simulated the occurrence of the fault. When the phase sequence was reversed, the reasons for instantaneous tripping of the induced draft fan was identified. The precautions for the change of the secondary circuit of the current transformer are obtained.Firstly, the protection device should be connected prior to the measuring instrument; secondly, the load test should be carried out before the differential protection is put into operation.
引文
[1]卓乐友,董柏林.电力工程电气设计手册电气二次部分[M].北京:中国电力出版社,1991:63-64.
[2]国家能源局.火力发电厂、变电站二次接线设计技术规程:DL/T5136—2012[S].北京:中国计划出版社,2013:19.
[3]国家能源局.厂用电继电保护整定计算导则:DL/T1502—2016[S].北京:中国电力出版社,2016:24.
[4]胡冬良,艾飞,章立新.一起变电站35 kV母线电压互感器高压熔丝异常熔断故障分析[J].浙江电力,2017, 36(1):5-10.
[2]国家能源局.火力发电厂、变电站二次接线设计技术规程:DL/T5136—2012[S].北京:中国计划出版社,2013:19.
[3]国家能源局.厂用电继电保护整定计算导则:DL/T1502—2016[S].北京:中国电力出版社,2016:24.
[4]胡冬良,艾飞,章立新.一起变电站35 kV母线电压互感器高压熔丝异常熔断故障分析[J].浙江电力,2017, 36(1):5-10.