JPS5822822U

JPS5822822U - Neutral point potential moving signal wave superimposition type insulation monitoring device

Info

Publication number: JPS5822822U
Application number: JP11445781U
Authority: JP
Inventors: 肇鈴木; 健介富永
Original assignee: ミドリ安全工業株式会社
Priority date: 1981-08-03
Filing date: 1981-08-03
Publication date: 1983-02-12

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図は本考案に係る中性点電位移動式信号波重畳型絶
縁監視装置の構成を示すブロックダイアグラム、第２図
は本考案装置で監視される単相３線式電路の結線図、第
３図は本考案装置で監視される三相３線式電路の結線図
、第４図は本考案装置の等価回路図、第５図はｉＲ酸成
分！。成分のベクトル和を示す図である。ＺＣＴ・・・零相変流器、Ｌ・・・インダクタンス、１
゜３・・・変圧器、２．４・・・第２種接地接地線、５
・・・インダクタンス駆動用電源、６・・・フィルター
回路、７・・・位相弁別回路、８・・・増巾器、９・・
・Ｉｏメーター、１０・・・増巾器、１１・・・■□メ
ーター、１２・・・比較器、１３・・・感度設定器。Fig. 1 is a block diagram showing the configuration of the neutral point potential moving signal wave superimposition type insulation monitoring device according to the present invention, Fig. 2 is a wiring diagram of a single-phase three-wire electric circuit monitored by the device of the present invention, Figure 3 is a wiring diagram of the three-phase, three-wire electric circuit monitored by the device of the present invention, Figure 4 is an equivalent circuit diagram of the device of the present invention, and Figure 5 is the iR acid component! . FIG. 3 is a diagram showing a vector sum of components. ZCT...Zero phase current transformer, L...Inductance, 1
゜3...Transformer, 2.4...Class 2 grounding wire, 5
... Inductance drive power supply, 6... Filter circuit, 7... Phase discrimination circuit, 8... Amplifier, 9...
- Io meter, 10... amplifier, 11... ■□ meter, 12... comparator, 13... sensitivity setting device.

Claims

[Scope of utility model registration request]

A zero-phase current transformer and inductance installed on the second type grounding wire in an electrical circuit, an inductance drive power source that excites the primary side of the inductance at a frequency other than the commercial frequency, and a current component detected by the zero-phase current transformer. A filter circuit extracts the current component due to the secondary output voltage of the inductance from the inductance, a phase discrimination circuit separates the current component due to the resistance component from the current component extracted by the filter circuit, and the current component separated by the phase discrimination circuit is displayed. Neutral point potential moving signal wave superimposition type insulation monitoring device consisting of a meter or other indicator.