JPS58180478U

JPS58180478U - Low-voltage line-to-ground capacitance compensator

Info

Publication number: JPS58180478U
Application number: JP7697782U
Authority: JP
Inventors: 井上　一男
Original assignee: ミドリ安全工業株式会社
Priority date: 1982-05-27
Filing date: 1982-05-27
Publication date: 1983-12-02
Also published as: JPH0428065Y2

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は変圧器の二次側一端子の第二種接地及びこの接
地線を流れる電流より対地漏洩電流を検出する方法の説
明図、第２図は単相電路において補償用コンデンサを使
用して対地静電容量による地絡電流分を変流器の二次出
力側において打ち消す回路図、第３゛図は対地漏れ抵抗
と、対地漏れ静電容量による合成電流のベクトル図、第
４図は第２図の検出器の構成を概略的に示す図、第５図
は補償用コンデンサを使用した場合の電流値の変化の説
明図、第６図ａは三相一端接地の電圧関係ベクトル図、
第６図すは三相一端接地の電圧和の一相に地絡が発生し
た場合のベクトル図、第７図は三相一端接地の場合に１
相ごとに測定する場合の回路図、第８図は中性点接地方
式の電路において各線の対地静電容量が平衡している場
合は静電容量による地絡電流の総和が０になる説明図で
ある。８・・・第２種接地線、９・・・変流器、１０・・・他
の電線、１３・・・補償用コンデンサ、１′４・・・別
の電線、１５・・・ベクトル和検出用電流測定器。第６図 −Ｃ第７図　　　　−９スFigure 1 is an explanatory diagram of the type 2 grounding of one terminal on the secondary side of a transformer and a method for detecting earth leakage current from the current flowing through this grounding wire. Figure 3 is a vector diagram of the combined current due to earth leakage resistance and earth leakage capacitance, and Figure 4 is a circuit diagram for canceling the earth fault current due to earth capacitance on the secondary output side of the current transformer. Figure 2 is a diagram schematically showing the configuration of the detector, Figure 5 is an explanatory diagram of changes in current value when a compensation capacitor is used, Figure 6a is a voltage relationship vector diagram of three phases with one end grounded,
Figure 6 is a vector diagram when a ground fault occurs in one phase of the voltage sum of three phases with one end grounded, and Figure 7 is a vector diagram when a ground fault occurs in one phase of the voltage sum of three phases with one end grounded.
A circuit diagram when measuring each phase, and Figure 8 is an explanatory diagram where the sum of ground fault currents due to capacitance is 0 if the ground capacitance of each wire is balanced in a neutral point grounded circuit. It is. 8... Second class grounding wire, 9... Current transformer, 10... Other electric wire, 13... Compensation capacitor, 1'4... Another electric wire, 15... Vector sum Current measuring device for detection. Figure 6-C Figure 7-9

Claims

[Scope of utility model registration request]

(1) Measure the leakage current in the current transformer by passing it through the second class grounding wire of the transformer connected to the low-voltage power line. Pass another wire through the current transformer, and one end of this wire is connected to the secondary side of the transformer. The other end is connected to one end of the variable capacitor,
The other end of this variable capacitor and the remaining terminal on the secondary side of the transformer are connected by another electric wire, and a current measuring device for vector sum detection is connected to the output terminal of the current transformer. Ground capacitance compensator.

(2) The low-voltage line-to-ground capacitance compensator according to claim 1, which separates the variable capacitor box and the vector sum detection current measuring device so that only one can be used as needed.