基于阻抗法和行波法组合的输电线距离保护

Distance protection of transmission line based on combining the traveling wave method and the impedance method

为了在某些特殊情况下,使用组合继电器提高保护的可靠性和速度,提出了一种基于阻抗法和行波法组合的距离保护方案。对于死区故障,采用了不受故障初始角及反射波等影响的阻抗法定位;对于一般性故障,采用了不受过渡电阻影响的行波法进行定位;将两种测量方法的优缺点互补组合,并进行了相应仿真试验。仿真试验结果表明:该保护方案能使继电器可靠、灵敏、高速地动作。

For improving the reliability and speed of protection in special condition, a distance protection scheme based on combing the traveling wave method and the impedance method was presented. For locating the dead zone fault , impedance protection method was adapted, the method was not affected by low inception angles and reflective traveling waves, etc. For locating the common fault , traveling wave method was used, which was not affected by the transition resistance at the faulty position. Advantages of two method were utilized and their disadvantages were avoided, simulation tests show that the protection scheme can make the relay to response reliable, sensitive and at high-speed.