基于暂态量主频特征的高压线路继电保护研究  

Research on HV line protection relay based on characteristic of main transient frequencies

作　　者：高效海[1] 张雪松[2] 张波[1] 王慧芳[1] 何奔腾[1] 

机构地区：[1]浙江大学电气工程学院,浙江杭州310027 [2]浙江省电力试验研究院,浙江杭州310014

出　　处：《机电工程》2013年第1期98-101,128,共5页Journal of Mechanical & Electrical Engineering

基　　金：国家电网公司科技资助项目(ZDK077-2011)

摘　　要：超高压输电线路故障暂态分量在频域上表现为一系列暂态主频率的形式,针对能否利用这些暂态主频率构成单端暂态保护以及构成单端暂态保护的可行性与可靠性的问题,进行了理论和仿真研究。首先对超高压线路故障暂态特征进行了分析,确定了影响暂态主频率的因素,通过合理简化,给出了这些暂态主频率与故障距离之间的关系;提出了"通过提取某一暂态主频率值,计算出故障距离,构成单端暂态保护"的方法;分析了影响保护可靠性的各种因素,并给出了减少这些影响因素的方法;最后通过ATP仿真,验证了理论的正确性和保护方案的可行性。研究结果表明,基于暂态量主频特征的保护是可行的,且在满足快速性要求的同时,其可靠性与主频率提取的精度、故障距离和选择的暂态主频率次数大小有关。The transient component on the high voltage（HV） transmission line is represented as a series of main transient frequencies in the frequency domain. Aiming at studying the feasibility and reliability of a protection scheme based on those frequencies, the transient characteristic of the fault HV transmission line was firstly analyzed, a relationship between fault distance and main frequencies was put forward, which indicating the size of those series of main transient frequencies can determine the size of the fault distance. Thus the distance by getting the size of a certain main transient frequency was calculated. Then the factors that influence the reliability of the protection scheme were studied and some measures to reduce the influence were advised. A simulation of ATP was carried out to prove the feasibility of this method. The results indicate that the method referred meets the demand of fast speed quality and the fault distance measurement error is related to factors like the precision of the transient frequency, the distance of the fault and the size of the main transient frequency.

关 键 词：高压线路 暂态量 继电保护 故障测距 暂态主频率 傅里叶变换 

分 类 号：TM723[电气工程—电力系统及自动化] TM77