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帶并聯電抗器的雙回輸電線路故障測距新方法

來源：電工電氣發(fā)布時間：2023-03-31 13:31 瀏覽次數：376

帶并聯電抗器的雙回輸電線路故障測距新方法

張帥，李澄，嚴棟

(國網江蘇省電力有限公司無錫供電分公司, 江蘇無錫 214000)

摘要：為解決帶并聯電抗器輸電線路兩側電流變化和線路參數不固定產生的故障測距誤差問題，提出了一種雙回輸電線路故障測距新方法。采用集中參數線路模型分析正序、負序、零序故障網絡，推導出與線路單位長度阻抗、導納以及并聯電抗器電抗值均無關的故障距離表達式。由線路分相電流差動保護裝置縱向通道和橫向通道獲取四側同步的模擬量數據，通過調整保護裝置的插件功能模塊研制出故障測距裝置。裝置試驗結果表明，新方法的測距精度高于裝置原有的方法，能解決線路兩側帶并聯電抗器和線路參數變化引起的測距誤差問題，且經過渡電阻故障時仍具有較高的測距精度。

關鍵詞： 并聯電抗器；線路參數；橫向通道；故障測距

中圖分類號：TM472 ；TM773 文獻標識碼：A 文章編號：1007-3175(2023)03-0047-08

A New Fault Location Method of Double-Circuit Transmission

Lines with Parallel Reactors

ZHANG Shuai, LI Cheng, YAN Dong

（Wuxi Power Supply Company of State Grid Jiangsu Electric Power Co., Ltd, Wuxi 214000, China）

Abstract: In order to deal with fault location caused by current changes occurring to both sides of transmission lines with parallel reactors and unfixed line parameters, a new fault location method of double-circuit transmission lines is put forward. The paper adopts the lump parameter circuit model to analyze positive sequence, negative sequence and zero sequence fault networks, and generates the fault location expression which is irrelevant to line impedance and admittance per unit and the reactance value of parallel reactors. Then, after achieving four-side synchronized analog data from longitudinal and horizontal channels of the phase segregated current differential protection device,the authors invent the fault location device through adjusting the plug-in function module of this protection device. Test results show that this new method of fault location is more accurate than the old one. It not only can solve the problem of location error caused by changes of parallel reactors and line parameters, but also can have higher ranging accuracy when passing transition resistance faults.

Key words: parallel reactor; line parameter; horizontal channel; fault location device

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帶并聯電抗器的雙回輸電線路故障測距新方法