谐振型电网单相接地故障消弧及选线研究

Research on arc-suppression and fault line selection of single-phase-to-ground fault in resonant grounded systems

传统的零序电流有功分量法在线路及消弧线圈电阻较小的情况下易造成误选。本文通过理论分析,研究了造成误选的原因,并在此基础上,将谐振型电网消弧线圈的调谐控制与单相接地选线相结合,通过消弧线圈串联阻尼电阻,合理控制故障时阻尼电阻的投切,大大提高了有功分量法的选线准确度。通过仿真,验证了该方法的可行性,并且开发了消弧线圈调谐控制及选线装置,介绍了装置的硬件设计与软件框图。

The traditional algorithm based on active component of zero-sequence current fails to select the fault line frequently. The paper analyzes the causes to the fail of the fault line selection through theoretical analysis, and combines the control of arc-suppression and the fault line selection of single-phase-to-ground fault in resonant grounded systems by optimizing the switching of the damping resistor. The simulation results show that the improved algorithm is more accurate on fault line selection. The hardware and software design of the device of arc-suppression and fault line selection is introduced.