變壓器電容隔直裝置關(guān)鍵技術(shù)及應(yīng)用分析
李游1,郭超1,卿俊杰1,黃學(xué)海1,趙政2,周波1
(1 國網(wǎng)成都供電公司,四川 成都 610041;2 西安交通大學(xué) 電氣工程學(xué)院,陜西 西安 710049)
摘 要:為保證變壓器安全穩(wěn)定運(yùn)行,需要利用變壓器直流偏磁抑制裝置控制流過變壓器中性點(diǎn)的直流。介紹了變壓器電容隔直裝置的基本原理、裝置組成和不同類型隔直裝置的對比,闡述了正常運(yùn)行狀態(tài)和系統(tǒng)故障時(shí)電容的投切控制邏輯與運(yùn)行模式,結(jié)合實(shí)際采集數(shù)據(jù)分析了電容投切后的電氣量變化,解釋了電容充電回路的振蕩過程,并對隔直電容應(yīng)用對電網(wǎng)保護(hù)的影響進(jìn)行了研究。
關(guān)鍵詞:變壓器;直流偏磁;電容隔直;控制邏輯
中圖分類號:TM403.5 文獻(xiàn)標(biāo)識碼:A 文章編號:1007-3175(2019)09-0012-06
Key Technology and Application Analysis of Capacitive DC Blocking Device for Transformer
LI You1, GUO Chao1, QING Jun-jie1, HUANG Xue-hai1, ZHAO Zheng2, ZHOU Bo1
(1 State Grid Chengdu Power Supply Company, Chengdu 610041, China;
2 School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China)
Abstract: In order to ensure the safe and stable operation of the transformer, it is necessary to control the DC flowing through the neutral point of the transformer with the DC bias suppression device. Introduction was made to the basic principle, the device composition and the comparison of different types of capacitive DC blocking devices. This paper described the control logic and operation mode of the capacitive DC blocking device in normal operation state and the system fault. The change of electric quantity after the capacitor switching was analyzed according to the actual acquisition data, and the oscillation process of the capacitor charging circuit was explained. This paper studied on the influence of the blocking capacitor application on the grid production.
Key words: transformer; DC bias, capacitive DC blocking; control logic
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