一種3/2接線方式下的開關設備回路電阻評估方法研究
吳仁澤,江海濤,卜京
南京理工大學 自動化學院,江蘇 南京 210094
摘 要:針對3/2接線方式開關設備回路電阻的在線評估問題,提出了一種基于電流測量的在線評估方法。利用基爾霍夫定律和歐姆定律建立3/2接線方式開關站開關設備的數學模型,將求解開關設備電阻的問題轉化為求解非齊次線性方程組的問題。在求解過程中,對于存在相關性的方程組系數矩陣,利用條件數的大小作為選取方程組系數矩陣組合的判斷依據對數學模型進行優化可有效提高求解精度,從而提高評估的質量。以某500 kV開關站的實測電流數據進行仿真計算,驗證了本方法的有效性。
關鍵詞:3/2接線;回路電阻;評估
中圖分類號:TM643;TM645 文獻標識碼:A 文章編號:1007-3175(2015)02-0005-04
Research on Evaluation of Switchgear Circuit Resistance for 3/2 Wiring Connection
WU Ren-ze, JIANG Hai-tao, BU Jing
School of Automation, Nanjing University of Science and Technology, Nanjing 210094, China
Abstract: 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 model 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.
Key words: 3/2 wiring connection; circuit resistance; evaluation
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