电力系统保护与控制
電力繫統保護與控製
전력계통보호여공제
POWER SYSTM PROTECTION AND CONTROL
2013年
13期
76-81
,共6页
架空线路%行波%故障定位%单端测距原理%双端测距原理
架空線路%行波%故障定位%單耑測距原理%雙耑測距原理
가공선로%행파%고장정위%단단측거원리%쌍단측거원리
overhead lines%traveling wave%fault location%single-ended ranging principle%double-ended ranging principle
分析了架空线路发生故障后行波的传播过程以及行波折、反射原理。针对双端测距的不足提出了一种基于分析单端行波前三个波头的故障测距新方法。首先，在线路两端安装实时通信装置，根据两端的第一个波头的到达时间先后识别故障点离两端母线哪一端更近，然后利用单端行波测距方法记录M端母线接收到的前三个波头到达的绝对时间，确定故障点类型，经过数学变形消去会对测距结果产生误差的主要影响因素行波传播速度v,求出故障点位置。所提方法避开了单端行波测距中区分第二个波头性质的难题，消除了双端原理测距中线路两侧准确时间同步问题对测距精度的影响，消除了会对测距结果产生误差的主要影响因素波速v ，进而提高了故障定位准确性。ATP-EMTP 仿真验证表明，所提出的不受波速影响的单端行波测距方法是可行的，故障定位精确度更高。
分析瞭架空線路髮生故障後行波的傳播過程以及行波摺、反射原理。針對雙耑測距的不足提齣瞭一種基于分析單耑行波前三箇波頭的故障測距新方法。首先，在線路兩耑安裝實時通信裝置，根據兩耑的第一箇波頭的到達時間先後識彆故障點離兩耑母線哪一耑更近，然後利用單耑行波測距方法記錄M耑母線接收到的前三箇波頭到達的絕對時間，確定故障點類型，經過數學變形消去會對測距結果產生誤差的主要影響因素行波傳播速度v,求齣故障點位置。所提方法避開瞭單耑行波測距中區分第二箇波頭性質的難題，消除瞭雙耑原理測距中線路兩側準確時間同步問題對測距精度的影響，消除瞭會對測距結果產生誤差的主要影響因素波速v ，進而提高瞭故障定位準確性。ATP-EMTP 倣真驗證錶明，所提齣的不受波速影響的單耑行波測距方法是可行的，故障定位精確度更高。
분석료가공선로발생고장후행파적전파과정이급행파절、반사원리。침대쌍단측거적불족제출료일충기우분석단단행파전삼개파두적고장측거신방법。수선，재선로량단안장실시통신장치，근거량단적제일개파두적도체시간선후식별고장점리량단모선나일단경근，연후이용단단행파측거방법기록M단모선접수도적전삼개파두도체적절대시간，학정고장점류형，경과수학변형소거회대측거결과산생오차적주요영향인소행파전파속도v,구출고장점위치。소제방법피개료단단행파측거중구분제이개파두성질적난제，소제료쌍단원리측거중선로량측준학시간동보문제대측거정도적영향，소제료회대측거결과산생오차적주요영향인소파속v ，진이제고료고장정위준학성。ATP-EMTP 방진험증표명，소제출적불수파속영향적단단행파측거방법시가행적，고장정위정학도경고。
The propagation and the principle of refraction and reflection of traveling waves after fault at overhead lines are analyzed. In respect to the lack of double-ended ranging, this paper proposes a new fault location method based on the analysis of the first three waves’ head of the single-ended traveling wave. First, the real-time communication device is installed at both ends of the line, according to the arrival time of the first wave’s head to determine which end of the bus the fault point approaches to. Then the absolute time of the first three waves’ head arrival received by M-end bus is recorded by using single-ended traveling wave ranging method and the types of fault point are determined. Mathematical deformation is used to eliminate wave velocity v which will produce errors to fault location results and fault point location is obtained. The method proposed avoids the problem of distinguishing the nature of the second wave head in single-ended traveling wave ranging, eliminates the influence of accurate time synchronization at both sides of line on ranging accuracy of double-ended ranging principle, and eliminates the wave velocity v, thus improving the accuracy of fault location. ATP-EMTP simulation results show that the proposed method is feasible, and its fault location accuracy is higher.
