电磁式/光电式电流互感器混用对线路差动保护分析  

Analysis of line differential protection with electromagnetic/photoelectric current transformer

作　　者：郭剑峰 张利 计海明 Guo Jianfeng;Zhang Li;Ji Haiming(State Grid Hebei Chengde Power Supply Company Hebei Chengde 067000,China)

机构地区：[1]国网冀北承德供电公司

出　　处：《电子测量技术》2019年第22期51-54,共4页Electronic Measurement Technology

摘　　要：为了降低电流互感器的在信号传输过程中出现保护误动作的概率,针对电磁式/光电式电流互感器混用对线路差动保护进行分析。仿真分析得到:为两侧配备相同的电流互感器时,所有重合闸操作都无法控制差动继电器完成动作。分别为两侧配备光电式电流互感器和电磁式电流互感器的情况下,如果出现区内故障,则保护依然能够完成正常动作;出现区外故障与断路器重合闸操作时,差动保护都可以进行动作。出现继电器跳闸现象时,电流将表现出显著的饱和特点。由于整定值提高后容易引起差动保护的拒动现象,因此需要通过其它方法来处理外部故障差动保护的误动作。In order to reduce the probability of protection misoperation in the signal transmission process of current transformer, the mixed use of electromagnetic/photoelectric current transformer is analyzed for line differential protection.Simulation analysis shows that when the same current transformers are equipped on both sides, all reclosure operations cannot control the differential relay to complete the action.In the case that both sides are equipped with photoelectric current transformers and electromagnetic current transformers, if there is a fault in the area, the protection can still complete the normal operation.In case of out-of-zone fault and circuit breaker recloser operation, differential protection can be operated.When the relay trip occurs, the current will show significant saturation characteristics.Because the increase of setting value can easily cause the misoperation of differential protection, it is necessary to use other methods to deal with the misoperation of external fault differential protection.

关 键 词：电流互感器 差动保护 继电器 仿真分析 

分 类 号：TP2[自动化与计算机技术—检测技术与自动化装置]