CAJ | 학술논문

由双侧同杆4回线与1条单回线构成的T型线路故障类型繁多,精确的故障测距成为重要研究课题.通过深入研究此类T型线路的特点以及反序分量的特点,提出首先利用同杆4回线反序正序电流量进行故障侧的判断,然后利用由不同支路计算到支接点T处所得的各正序电压之间的关系进行同杆4回线故障支路的判定,最后根据故障发生在不同支路时的反序正序电流公式列出方程来进行准确的故障测距.通过大量的ATP仿真,可以证明该测距算法适用于这种结构的输电线路,并且可以从原理上完全消除过渡电阻、系统运行方式、系统阻抗参数变化等因素对测距精度的影响.
유쌍측동간4회선여1조단회선구성적T형선로고장류형번다,정학적고장측거성위중요연구과제.통과심입연구차류T형선로적특점이급반서분량적특점,제출수선이용동간4회선반서정서전류량진행고장측적판단,연후이용유불동지로계산도지접점T처소득적각정서전압지간적관계진행동간4회선고장지로적판정,최후근거고장발생재불동지로시적반서정서전류공식렬출방정래진행준학적고장측거.통과대량적ATP방진,가이증명해측거산법괄용우저충결구적수전선로,병차가이종원리상완전소제과도전조、계통운행방식、계통조항삼수변화등인소대측거정도적영향.
Because of the various fault types,it is difficult to precisely locate the fault of T-type transmission line consisting of single-line and four-parallel-line. Based on the characteristics of this T-type line and its inverted-sequence components,the faulty line selection and fault locating method are proposed. Firstly,the faulty side can be found by the inverted positive-sequence current of four-parallel-line on same tower. Then the relationship among the positive-sequence voltages of four parallel lines at T point is used to detect its faulty branch. Finally,the inverted positive-sequence current formulas listed according to the particular faulty line are used to precisely locate the fault. Results of ATP simulation prove it is suitable for this transmission line structure and immune to the effect of transition resistance,system operating mode and system impedance change on locating precision.