摘要
当前处理电力线路单相断线故障时,主要依靠电流信号进行故障识别,而电流信号中包含的故障特征不明显,最终导致保护动作时间较长。为此,以110 kV电力线路为研究对象,展开单相断线故障分析,并提出对应的保护方法。运用对称相量法,针对电力线路故障后的电压、电流等多方面数据分别进行分析,获取线路故障特征,再基于此识别单相断线故障。深入分析三相电压的相序关系,并确定故障后的电压相序突变信息,从而判断故障方向。最后,在电力线路中安装自动重合闸,并结合零序电流保护原理快速切除单相断线故障,实现电力线路保护。实验结果表明将所提方法应用在110 kV电力线路中,面对单相断线故障时保护动作时间为0.4 s,满足了故障处理实时性要求。
At present,when dealing with single-phase broken line fault of power lines,fault identification mainly depends on current signals,but the fault characteristics contained in current signals are not obvious,which ultimately leads to a longer protection action time.Therefore,taking 110 kV power line as the research object,the single-phase break fault analysis is carried out and the corresponding protection method is proposed.By adopting the symmetrical phasor method,the voltage,current and other data generated after the occurrence of power line fault are analyzed respectively to obtain the line fault characteristics,based on which the single-phase broken line fault is identified.The phase sequence relationship of three-phase voltage is deeply analyzed,and the post-fault sudden change information of voltage phase sequence is determined to judge the fault direction.Finally,automatic reclosure is installed in the power line,and combined with the principle of zero sequence current protection,the single-phase break fault is quickly removed to achieve power line protection.The experimental results show that by applying the proposed method to 110 kV power lines,the protection action for treating the single-phase broken line fault costs only 0.4 s,which meets the real-time requirements of fault processing.
作者
曾佳福
ZENG Jiafu(Water Resources Allocation Center of the Quanzhou Shanmei Reservoir,Quanzhou 362000,China)
出处
《电工技术》
2023年第18期207-209,215,共4页
Electric Engineering
关键词
电力线路
单相断线
零序保护
故障分析
故障方向
零序电流
power line
single phase disconnection
zero sequence protection
fault analysis
fault direction
zero sequence current
