云南电力技术
雲南電力技術
운남전력기술
Yunnan Electric Power
2015年
4期
19-21
,共3页
蒋彪%杨波%冯文昕%李文涛%徐军
蔣彪%楊波%馮文昕%李文濤%徐軍
장표%양파%풍문흔%리문도%서군
接地极线路%高阻%突变率%PSCAD仿真
接地極線路%高阻%突變率%PSCAD倣真
접지겁선로%고조%돌변솔%PSCAD방진
ground electrode line%high resistance%process variables%quantities%PSCAD simulation
由于直流系统接地极线路电压较低, 当发生高阻接地故障, 尤其故障点在极址附近时, 传统保护方式动作灵敏性较低, 导致保护拒动率较大. 因高阻接地时, 差流变化率和能量突变率明显, 故本文提出一种基于差流变化率和能量突变率的接地极线路高阻接地故障识别方法, 并通过PSCAD进行验证.
由于直流繫統接地極線路電壓較低, 噹髮生高阻接地故障, 尤其故障點在極阯附近時, 傳統保護方式動作靈敏性較低, 導緻保護拒動率較大. 因高阻接地時, 差流變化率和能量突變率明顯, 故本文提齣一種基于差流變化率和能量突變率的接地極線路高阻接地故障識彆方法, 併通過PSCAD進行驗證.
유우직류계통접지겁선로전압교저, 당발생고조접지고장, 우기고장점재겁지부근시, 전통보호방식동작령민성교저, 도치보호거동솔교대. 인고조접지시, 차류변화솔화능량돌변솔명현, 고본문제출일충기우차류변화솔화능량돌변솔적접지겁선로고조접지고장식별방법, 병통과PSCAD진행험증.
Voltage on DC system ground electrode Line is low, when high resistance grounding fault, especially the fault point in very near the ground site, the traditional ways of protection action sensitivity is low, resulting in the rejection rate greater protection. Because of the high resistance grounding, differential flow rate of change and the energy mutation rate obviously, therefore this arti-cle proposed one kind based on the differential current change rate and energy mutation identification method of high resistance grounding fault line is connected with the rate of the ends of the earth, and is verified by PSCAD.