摘要
该文提出一种基于故障测距的单相自动重合闸永久故障电压自适应补偿判据。该判据以故障点瞬时故障电压理论值为定值,由故障测距结果求出故障点实际电压,当故障点实际电压小于定值时为永久性故障,反之为瞬时性故障;考虑了由过渡电阻引起的故障测距误差对该判据的影响,给出了一种在高阻状况下测距不可靠时的解决方法。讨论了当线路侧无PT时,通过线路CT获取判据所需线路电压的原理。仿真结果表明:该判据可以准确地区分永久性和瞬时性故障,适用于110kV-220kV线路和不带并联电抗器的330kV-500kV线路。
A novel approach of distinguishing between temporary and permanent fault in single pole autoreclosing based on fault location is proposed. This criterion uses the fault location result to get the fault point voltage and take the fault point voltage in theory as the setting value to distinguish the “permanent” fault from “temporary” fault. When the fault voltage is less than the setting value, the fault is permanent. Otherwise, a temporary fault is proved. Also resolutions have been discussed in high impedance and how to get the line-side voltage when no line-side voltage transformers have been installed. A lot of simulations show that it can identify the “temporary” and “permanent” faults correctly and be easily applied in a practical system such as 110kV^220kV transmission lines as well as 330kV^500kV transmission lines without shunt reactors.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2004年第4期80-84,共5页
Proceedings of the CSEE
关键词
电力系统
故障测距
单相自动重合闸
电压自适应补偿判据
仿真
Power system
Fault Location
Single-pole autoreclosing
Adaptive voltage compensation criterion
EMTP simulation
