带并联电抗器的超/特高压输电线路单相故障特性研究  

Study on Characteristics of Single-phase Faults in EHV and UHV Transmission Lines with Shunt Reactors

作　　者：邵文权[1] 王建波[2] 刘毅力[1] 李彦斌[1] 

机构地区：[1]西安工程大学电气工程系,陕西西安710048 [2]陕西电力科学研究院,陕西西安710054

出　　处：《陕西电力》2010年第9期14-17,共4页Shanxi Electric Power

基　　金：陕西省教育厅自然科学专项基金(09JK455);陕西省自然基金(2010JM7013);西安工程大学校管基金(2008XG14)

摘　　要：采用单相重合闸技术有利于提高输电系统的可靠性和安全性,避免重合于永久性故障以减小二次短路冲击具有现实意义。文中对带并联补偿电抗器线路在恢复电压阶段的端电压和电抗器电流特性进行了理论分析,端电压和电抗器电流由于存在工频和自由分量而存在明显的拍频特性。仿真结果表明,瞬时性故障时故障相端电压和电抗器电流包含幅值较大的工频和自由分量,而永久性故障时仅有工频分量;且并联电抗器电流在相间电容高补偿时相对于端电压仍具有较高的测量精度。Single-phase auto-reclosure technique has been an effective method to improve the reliability and safety of power system and unsuccessful relosure in permanent fault is helpful to avoid second short shock. In the voltage-restoring period of a transient fault, theoretical analysis shows that the tripped phase voltage and reactor current are of power frequency and free frequency components, which produces notable beat-frequency. Simulation results indicated that the voltage and current are of power frequency and free frequency components in transient fauhs, but only power frequency in permanent faults. Moreover, it is promised that the current is measured with higher accuracy than the voltage.

关 键 词：输电线路 单相重合闸 并联电抗器 恢复电压 并联电抗器电流 

分 类 号：TM732[电气工程—电力系统及自动化] TM762.2