CAJ | 학술논문

直流输电系统接地极故障保护配置的不平衡保护动作触发条件和保护策略都存在一定的缺陷。针对存在的问题，介绍单极大地回线运行方式下接地极引线故障的运行实例。然后借鉴输电线路的纵联保护原理，在原保护基础上提出了基于纵联保护原理的不平衡保护改进方案。应用结果表明：改进的方案可根据接地极引线发生接地故障和断线故障时各电流值的变化规律来判断故障类型。
직류수전계통접지겁고장보호배치적불평형보호동작촉발조건화보호책략도존재일정적결함。침대존재적문제，개소단겁대지회선운행방식하접지겁인선고장적운행실례。연후차감수전선로적종련보호원리，재원보호기출상제출료기우종련보호원리적불평형보호개진방안。응용결과표명：개진적방안가근거접지겁인선발생접지고장화단선고장시각전류치적변화규률래판단고장류형。
The DC power system’s grounding electrode fault protection doesn’t work perfectly at home and some defects can be found in trigger conditions of unbalance protection and protection strategies.Taking the grounding electrode’s wire fault as an example and basing on the principle of pilot protection,an improved un-balance protection scheme was proposed.The application results show that this method can determine the fault types according to the current variation of the grounding electrode while any failure occurs to the electrode wire.