一种3/2接线方式下的开关设备回路电阻评估方法研究  

Research on Evaluation of Switchgear Circuit Resistance for 3/2 Wiring Connection

作　　者：吴仁泽 江海涛[1] 卜京[1] 

机构地区：[1]南京理工大学自动化学院,江苏南京210094

出　　处：《电工电气》2015年第2期5-8,46,共5页Electrotechnics Electric

基　　金：中央高校基本科研业务费专项资金资助(30920130121010)

摘　　要：针对3/2接线方式开关设备回路电阻的在线评估问题,提出了一种基于电流测量的在线评估方法。利用基尔霍夫定律和欧姆定律建立3/2接线方式开关站开关设备的数学模型,将求解开关设备电阻的问题转化为求解非齐次线性方程组的问题。在求解过程中,对于存在相关性的方程组系数矩阵,利用条件数的大小作为选取方程组系数矩阵组合的判断依据对数学模型进行优化可有效提高求解精度,从而提高评估的质量。以某500 k V开关站的实测电流数据进行仿真计算,验证了本方法的有效性。Aiming at the online evaluation problem of 3/2 wiring connection switchgear circuit resistance, this paper proposed a kind of online evaluation method based on current measurements. This method used Kirchhoff＇s and Ohm＇s laws to establish the mathematical mod- el of switchgear substations which used 3/2 wiring connection. The switchgear resistance problems were converted into non-homogeneous linear equations. To make the calculation for the value of the resistance more accurate, some equations were selected from the correlation coefficient matrix of the equations by comparing matrix condition number, so as to improve the evaluation quality. Simulation studies on the current data obtained from 500 kV switchgear substations verify the effectiveness of the proposed method.

关 键 词：3/2接线 回路电阻 评估 

分 类 号：TM645[电气工程—电力系统及自动化] TM564