低圧連系用三相パワーコンディショナへの適用を想定した低圧配電線側からの高低圧混触地絡事故の直接検出手法

カテゴリ: 論文誌(論文単位)

グループ名: 【B】電力・エネルギー部門

発行日: 2018/02/01

タイトル(英語): Direct Detection Method of Ground Fault by the Contact between High and Low Voltage Lines from Low Voltage Distribution Line Side for Three Phase Power Conditioners

著者名: 吉田　義昭（広島工業大学 工学部 電気システム工学科），佐伯　颯太（広島工業大学 工学部 電気システム工学科），布村　直人（広島工業大学 工学部 電気システム工学科）

著者名(英語): Yoshiaki Yoshida (Department of Electrical Systems Engineering, Hiroshima Institute of Technology), Souta Saiki (Department of Electrical Systems Engineering, Hiroshima Institute of Technology), Naoto Nunomura (Department of Electrical Systems Engineering

キーワード: 地絡事故，直接検出，地絡電流，線間電圧変化，B種接地抵抗　　ground fault，direct detection，ground current，line voltage change，B type earth resistance

要約(英語): When the ground fault by the contact between high and low voltage lines occurs, the line ground current flows into the earth resistance in the secondary side of the pole transformer. So the ground voltage rises from 300 to 600V, it is necessary to open the electric circuit within 1 second for safety. The methods to detect the ground fault are classified into “direct detection” and “indirect detection”. Previously, the direct detection is to detect the zero phase voltage by the over voltage ground relay from high voltage distribution line side. In this paper, we propose a new method to detect the ground fault directly from low voltage distribution line side for three phase power conditioners. During the ground fault, line currents are three phase unbalanced currents, and make the unbalance of the line voltage changes through the line impedance. Proposed method detects the unbalance of the line voltage changes from the view point of both the scalar change and the vector change. Firstly, we describe the detection principle by using the simple high voltage distribution line model. Next, we have developed the analysis model for three phase unbalanced power flow in considering the influence of various power system conditions, and clarified the detection setting values for the proposed method.

本誌: 電気学会論文誌B（電力・エネルギー部門誌） Vol.138 No.2 （2018） 特集：平成29 年電力・エネルギー部門大会

本誌掲載ページ: 69-81 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejpes/138/2/138_69/_article/-char/ja/