CAJ | 학술논문

　　针对线-缆混合线路中线-缆接头处波阻抗不连续、电缆波速度难以确定的行波测距难点，本文分析了线-缆混合线路不同区段单相接地故障时的行波特征，提出了一种综合利用单、双端测距原理，不受电缆波速度影响的故障测距新方法。对确定的混合线路，根据电流线模与零模分量模极大值的极性规律确定故障点反射波，实现单端测距；同时，根据双端初始行波到达时刻进行双端测距。然后联立以上单、双端测距，即可在线计算得到电缆的实时波速度，测距结果更加准确。大量Matlab仿真表明，单相接地故障时，该方法简单有效，解决了混合线路测距难点问题，测距精度大幅提高。
　　침대선-람혼합선로중선-람접두처파조항불련속、전람파속도난이학정적행파측거난점，본문분석료선-람혼합선로불동구단단상접지고장시적행파특정，제출료일충종합이용단、쌍단측거원리，불수전람파속도영향적고장측거신방법。대학정적혼합선로，근거전류선모여령모분량모겁대치적겁성규률학정고장점반사파，실현단단측거；동시，근거쌍단초시행파도체시각진행쌍단측거。연후련립이상단、쌍단측거，즉가재선계산득도전람적실시파속도，측거결과경가준학。대량Matlab방진표명，단상접지고장시，해방법간단유효，해결료혼합선로측거난점문제，측거정도대폭제고。
Aiming at the line fault location difficulties of the wave impedence on cables and overhead lines being discontinuous and the confirm of wave speed being difficult, this paper analyzes the characters of current traveling waves at joints for single-phase grounded faults in different sections and presents a new fault locating method for hybrid lines. The method synthesizes single-terminal and two-terminals distance measurement theory which is unacted on the wave speed in the cable. For the identified hybrid line, the fault point reflecting wave is detected by the polar of aerial and ground modal maximums, then single-terminal distance measurement on the hybrid line is realized; at the same time, two-terminals distance measurement proceed on the basis of the moments of traveling wave arriving at both terminals. Finally it synthesizes the two parts aforesaid to figure up wave speed on the cable online for improving range accuracy. Many a Matlab simulation proves that the method presented is brief and effective, and it solves the difficulties of fault location for hybrid line, thus the accuracy of fault location improves considerably.