CAJ | 학술논문

接地极是高压直流输电系统中最重要的组成部分之一。为了提高接地极保护可靠性，根据接地极线路参数及运行特性，提出了一种基于纵联差动保护原理的接地极不平衡保护方法。该方法将互感器装设在接地极引线的近站端和极址端，给出了纵差保护方案和保护判据，优化了保护动作策略，分析了保护动作特性。仿真结果表明，提出的接地极不平衡保护能准确辨识故障类型，准确动作隔离故障，有效降低直流系统停运概率。
접지겁시고압직류수전계통중최중요적조성부분지일。위료제고접지겁보호가고성，근거접지겁선로삼수급운행특성，제출료일충기우종련차동보호원리적접지겁불평형보호방법。해방법장호감기장설재접지겁인선적근참단화겁지단，급출료종차보호방안화보호판거，우화료보호동작책략，분석료보호동작특성。방진결과표명，제출적접지겁불평형보호능준학변식고장류형，준학동작격리고장，유효강저직류계통정운개솔。
Grounding electrode is the most important part of HVDC systems. In order to improve the reliability of grounding electrodes line protection, a new unbalance current protection based on the longitudinal differential protection principle is proposed. The protection transformers are installed in the head and end of the grounding electrode line, the longitudinal differential protection scheme and criterion are presented, the original action strategy is optimized and the protection action characteristics are analyzed. The simulation results show that the unbalance protection is effective, which could accurately distinguish the fault types and act to isolate faults, and reduce the probability of HVDC shutdown.