电力系统自动化
電力繫統自動化
전력계통자동화
AUTOMATION OF ELECTRIC POWER SYSTEMS
2012年
1期
86-89,95
,共5页
线路保护%行波差动保护%分布电容电流%差动判据
線路保護%行波差動保護%分佈電容電流%差動判據
선로보호%행파차동보호%분포전용전류%차동판거
line protection%traveling-wave differential protection%distributed capacitive current%differential criterion
纵联电流差动保护用于长距离输电线路时,会受到分布电容电流的影响。基于输电线路的分布参数模型,分析了分布电容电流与方向电流行波传输延时的等价性,研究了传统行波差动保护的实现方式,提出一种基于行波差动原理的实用保护方案。该方案利用同侧电流的实测值和计算值构成差动判据,在获取电流计算值时,无需进行插值计算,也不需要对侧电压信息,从而减小了计算量,降低了对采样率和通信速率的要求。ATP仿真表明,该方案能够有效地消除分布电容电流的影响。
縱聯電流差動保護用于長距離輸電線路時,會受到分佈電容電流的影響。基于輸電線路的分佈參數模型,分析瞭分佈電容電流與方嚮電流行波傳輸延時的等價性,研究瞭傳統行波差動保護的實現方式,提齣一種基于行波差動原理的實用保護方案。該方案利用同側電流的實測值和計算值構成差動判據,在穫取電流計算值時,無需進行插值計算,也不需要對側電壓信息,從而減小瞭計算量,降低瞭對採樣率和通信速率的要求。ATP倣真錶明,該方案能夠有效地消除分佈電容電流的影響。
종련전류차동보호용우장거리수전선로시,회수도분포전용전류적영향。기우수전선로적분포삼수모형,분석료분포전용전류여방향전류행파전수연시적등개성,연구료전통행파차동보호적실현방식,제출일충기우행파차동원리적실용보호방안。해방안이용동측전류적실측치화계산치구성차동판거,재획취전류계산치시,무수진행삽치계산,야불수요대측전압신식,종이감소료계산량,강저료대채양솔화통신속솔적요구。ATP방진표명,해방안능구유효지소제분포전용전류적영향。
When using for long distance transmission lines,the current differential protection suffers from influence of the distributed capacitive current.Based on distributed parameter line model,equivalence of the distributed capacitive current and the directional current traveling-wave transmission delay is analyzed and implementation mode of the traditional traveling-wave differential current protection is discussed.Furthermore,an applied protection scheme based on traveling-wave differential principle is proposed.The new scheme forms a differential criterion with the measured and the calculated current values of the same side of the line.When calculating the current,it needs not to use interpolation or voltage of the opposite side,which results in less computation and lower demand of sampling and communication rate.Simulation with ATP shows that the new scheme can eliminate the impact of distributed capacitive current effectively.
