极化电流行波方向继电器在带并联电抗器输电线上的特性

Characteristics of Polarized Current Travelling Wave-based Directional Relay in Transmission Lines with Shunt Reactors

由于传统的光纤电流差动保护无法直接应用于带并联电抗器的输电线路,均需要进行补偿。基于极化电流行波方向继电器应用于带并联电抗器的线路,文中深入分析了并联电抗器上的行波过程、传输频域分析以及对基于小波变换的极化电流行波方向继电器的影响。结果表明,带并联电抗器的线路不会影响暂态行波波头的方向,同时也不会影响工频行波波头的提取。因此,基于极化电流行波方向继电器的保护能够直接适用于带有并联电抗器的线路。电磁暂态程序(EMTP)的仿真和实际装置的测试结果均表明了该保护在带并联电抗器线路上的优良特性。

It＇s known that traditional fiber current differential protection cannot be directly applied to transmission lines with shunt reactors without compensation. In view of polarized current travelling wave-based directional relay used in lines with shunt reactors, an in-depth analysis is made of the process of travelling wave through shunt reactors, the transmission frequency domain with shunt reactors and the impact on polarized current travelling wave-based directional relay based on wavelet transform. The results show that lines with shunt reactors will not affect the direction of the transient traveling wave head nor the extraction of the wave-frequency line. Therefore, polarized current travelling wave-based directional relay can be directly applied to transmission lines with a shunt reactor. Both EMTP simulation and actual device test results show the excellent characteristics of the protection in lines with shunt reactors.