我国紧凑型输电线路的电气参数特性分析

我国紧凑型输电线路的三相导线采用了具有中国特色的同塔窗内倒三角布置形式，这种特殊的导线布置形式决定了它具有特殊的电气参数特性。分析了紧凑型输电线路的电气参数的工频特性和频变特性，并研究了地线与接地方式、大地电阻率变化对线路电气参数的影响。最后结合计算结果评价了这些特性对线路潜供电流和恢复电压、继电保护、无功调节、过电压限制、电磁暂态分析等方面的影响。研究结果将对未来紧凑型输电线路的设计和运行起到积极作用。

Analysis on Electric Parameter Characteristics of Compact Transmission Lines in China

A special conductor configuration mode,i.e., three phase conductors are arranged in inverted-delta mode within the same tower window,is adopted in compact transmission lines in China.Such a special arrangement of phase conductors leads to special electric parameter characteristics.The authors systematically analyse power frequency characteristics and frequency-dependent characteristics of electric parameters of these compact transmission lines,and research the influences of ground wires,ground modes and ground resistivity variation on electric parameters of these compact transmission lines.On the basis of calculation results the authors evaluate the influences of these characteristics on secondary arc current and recovery voltage,protective relaying,reactive power regulation,overvoltage limitation and electromagnetic transient.The research conclusion will be useful for the design and operation of compact transmission lines in the future.