摘要
矿井电网属于小电流接地系统,其中最常见的故障是漏电故障。目前对于小电流接地系统的漏电保护方法主要基于稳态特征或者暂态特征,但这两类方法都不能很好地适用于消弧线圈接地系统。因此提出一种零序导纳增量选择法,只需求得线路故障前和故障后的零序导纳差值,即可准确选择出故障线路和非故障线路,这样就可以据此跳闸断开故障线路,减小故障造成的影响。依据提出的方法设计漏电保护装置,并在实验台上搭建模拟线路进行漏电保护实验,实验结果证明了提出的漏电保护方法是有效的。
Mine power system belongs to small current grounding system,in which the most common fault is leakage fault.At present,the leakage fault protection of small current grounding system is mainly based on steady-state characteristics or transient characteristics,but these two kinds of methods are not well suitable for arc suppression coil grounding system.Therefore,this paper proposes a zero-sequence admittance increment selection method,which only needs to obtain the zero sequence admittance difference between the pre-fault and after-fault of the line.So as to accurately select the fault line and non-fault line,so that the fault line can be tripped and disconnected to reduce the impact of the fault.According to the method proposed in this paper,the leakage protection device is designed,and an circuit is built on the experimental platform for leakage protection experiment.The experimental results show that the leakage protection method proposed in this paper is effective.
出处
《工业控制计算机》
2022年第11期139-140,143,共3页
Industrial Control Computer
关键词
零序导纳增量选择法
小电流接地系统
漏电保护
故障线路
消弧线圈
zero-sequence admittance increment selection method
small current grounding system
leakage fault protection
fault line
arc suppression coil grounding system
