基于微量法的發(fā)變電站接地網(wǎng)腐蝕故障診斷
徐文文1，李石磊2，屈亞軍1，劉航2，劉崇新2
（1 陜西省地方電力設(shè)計研究院，陜西 西安 710065；2 西安交通大學 電氣工程學院，陜西 西安 710049）
摘 要：腐蝕故障的出現(xiàn)會使接地網(wǎng)的可靠性降低。介紹了接地網(wǎng)腐蝕故障診斷的基本思路和方法，構(gòu)造了基于特勒根定理的腐蝕故障診斷方程，并采用雙激勵源和多電流值輸出的方法增加方程中獨立方程的個數(shù)。針對腐蝕前后支路電阻值變化很大和方程的非線性問題，采用微量線性處理法和迭代計算進行處理，同時使用端口電壓測量值確保迭代逼近的正確方向。針對一個接地網(wǎng)仿真模型進行模擬故障診斷，結(jié)果表明，該方法能準確判斷故障支路位置，且可大概估計腐蝕后故障支路的電阻變化倍數(shù)。
關(guān)鍵詞：接地網(wǎng)；故障診斷；微量法；線性規(guī)劃
中圖分類號：TM862 文獻標識碼：A 文章編號：1007-3175(2017)12-0013-05
Corrosion Fault Diagnosis for Power Station and Substation’s Grounding Grid Based on Micro Method
XU Wen-wen1, LI Shi-lei2, QU Ya-jun1, LIU Hang2, LIU Chong-xin2
（1 Shaanxi Provincial Electric Power Design and Research Institute, Xi’an 710065, China;
2 School of Electric Engineering, Xi’an Jiaotong University, Xi’an 710049, China）
Abstract: The appearing corrosion faults will lower the reliability of grounding grid. Introduction was made to the basic idea and method of corrosion fault diagnosis for grounding grid. This paper constructed the corrosion fault diagnosis equation based on Tellegen's theorem and adopted the dual-excitation source and multi-current value output method to increase the independent equation numbers in equations. In allusion to the problems that the circuit branch resistance value fluctuated greatly before and after corrosions, as well as the nonlinearity problem, the iterative algorithm based on micro linear processing was adopted and the port voltage observed value was used to guarantee the right direction toward the iteration. A model of grounding grid was carried out the simulated fault diagnosis. The results show that this method can judge the fault circuit branch’s position accurately, to roughly estimate the resistance variation multiple of corrosion fault circuit branches.
Key words: grounding grid; fault diagnosis; micro method; linear programming
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