CAJ | 학술논문

纵联零序方向保护已成功应用于特高压输电线路的继电保护中.零序方向元件作为纵联零序方向保护的核心器件,其基本原理决定了其只能反应接地故障而不能反应相间故障和对称故障,针对这一问题提出了改进方法.改进的零序方向元件是利用数据窗的延迟和三选二的逻辑配合来实现对相间故障和对称故障的正确判断.改进后的零序方向元件,不仅能正确反应接地故障,而且对于三相故障和相间故障也可以很好地反应.理论分析和大量仿真对改进的零序方向元件的工作正确性进行了验证,证明了其可以在特高压输电线路上很好地应用,满足特高压交流输电继电保护的要求.
종련령서방향보호이성공응용우특고압수전선로적계전보호중.령서방향원건작위종련령서방향보호적핵심기건,기기본원리결정료기지능반응접지고장이불능반응상간고장화대칭고장,침대저일문제제출료개진방법.개진적령서방향원건시이용수거창적연지화삼선이적라집배합래실현대상간고장화대칭고장적정학판단.개진후적령서방향원건,불부능정학반응접지고장,이차대우삼상고장화상간고장야가이흔호지반응.이론분석화대량방진대개진적령서방향원건적공작정학성진행료험증,증명료기가이재특고압수전선로상흔호지응용,만족특고압교류수전계전보호적요구.
Pilot zero-sequence directional protection has been applied successfully to the relay protection in UHV transmission line. The basic principle of zero-sequence directional element determines that it can only react to the grounding fault but can't react phase to phase fault and symmetrical fault, this paper takes out a way to solve this question. Zero-sequence directional element improvement is that using the data window delay and logic choice together to give the correct judgment of the phase to phase fault and symmetrical fault. The improved zero-sequence directional element not only can correctly reflect the grounding fault, but also can take a very good reaction for the three phase fault and phase to phase fault. And a lot of theoretical analysis and simulation on the improved zero-sequence direction element proved that it can work correctly and its application in UHV transmission lines is very good.