方向高频保护的动作行为分析──第一部分 : 复杂系统的复故障计算

Performance Analysis of power Line carrier protection far Transmission Lines

方向高频保护为高压和超高压输电线路的主要保护方式，其动作性能对电力系统的安全运行影响甚大。目前国内外广泛应用的方向高频保护的方向元件种类很多。有方向阻抗元件，负序方向元件，正序故障分量方向元件，工频变化量方向元件，相电压补偿式方向元件，行波方向元件等。这些方向元件中除了行波方向元件外，其他各种方向元件在区内、外故障时，其动作行为都与网络结构、运行方式、故障类型、故障位置、过渡电阻大小有很大关系。对于这些关系尚未见彻底的研究分析。在本文第一部分中，对复杂电网中各种简单故障和复故障的故障电流、电压全量以及故障分量的计算方法进行了研究，研制了大型的计算程序和绘图程序，以便于进行大规模的计算。在本文第二部分中研制了分析比较程序。利用这些大量计算结果，对各种方向元件进行各种区内、外故障情况下动作行为的分析。

The power line carrier Pratection with directional comparison is the most important mode of Hv and EHV transmission line protection.Their performance directly affect the securify of power system operation. At present there are many types of directional relay used in such protection devices. such as MHO type impedance relay. directional relay based on negative is sequences. on positive sequences fault components. on variation comporents of industrial frequency phase compensator tyre directional relay etc. The performances of all these types of directional relays in time of internol and external faults greatly depend on the elecrtic power system configuration,state of operation,fault distance ,fault resistances.fault phases etc.How these factans affect the performances of these relays and in what extent?this problem have not been thoroughly studied yet In the finst part of this paper the calculation method of phase currents,voltages and their fault components of complex electric net work,under various types of simple and complex faults inside and outside of protected zone are studied. A Large program of calculation and drawing are studied and established.In the second part of this paper The program of an alysis and comparison by using the great quantity of these calculation results,which help analysing the different types of directional relays in different fault locatins and foult types