JPS59103533U

JPS59103533U - overcurrent relay

Info

Publication number: JPS59103533U
Application number: JP20191882U
Authority: JP
Inventors: 井下　正法; 宮津　多佑
Original assignee: オムロン株式会社
Priority date: 1982-12-27
Filing date: 1982-12-27
Publication date: 1984-07-12

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図は過電流継電器の構成の概略を示すブロック図、
第２図は従来の過電流継電器の要部（最大値検出回路）
を示す回路図、第３図は本考案の過電流継電器の要部（
最大値検出回路）の一実施例を示す回路図である。１・・・・・・配電線、４．５・・・・・・整流回路、
６・・・・・・最大値検出回路、７・・・・・・レベル
検出回路、８・・・・・・タイマ回路、９・・・・・・
補助継電器、１０．１１・・・・・・ＯＰアンプ、１４
・・・・・・可変抵抗回路、Ｒｆ、　Ｒｓ、　Ｒ１へ１
□・・・・・・抵抗、ＳＷ１〜ＳＷ３・・・・・・レベ
ル切替スイッチ。Figure 1 is a block diagram schematically showing the configuration of an overcurrent relay.
Figure 2 shows the main parts of a conventional overcurrent relay (maximum value detection circuit)
The circuit diagram shown in Figure 3 shows the main parts of the overcurrent relay of the present invention (
FIG. 2 is a circuit diagram showing an example of a maximum value detection circuit. 1... Distribution line, 4.5... Rectifier circuit,
6... Maximum value detection circuit, 7... Level detection circuit, 8... Timer circuit, 9...
Auxiliary relay, 10.11...OP amplifier, 14
・・・・・・Variable resistance circuit, Rf, Rs, 1 to R1
□・・・Resistance, SW1~SW3・・・Level changeover switch.

Claims

[Claims for Utility Model Registration] A plurality of rectifier circuits that rectify the outputs from current transformers installed in each of the plurality of phases of a distribution line; Only the output with the maximum level is selected from among the outputs of these rectifier circuits. a maximum value detection circuit that outputs a maximum value; a level detection circuit that detects that the output level of this maximum value detection circuit exceeds a predetermined level value; and a level detection circuit that turns on after a predetermined time in response to the output of this level detection circuit. and a timer circuit for driving an auxiliary relay; the maximum value detection circuits are provided in correspondence with the number of rectifier circuits, and each amplifies the output of the rectifier circuit. . An overcurrent relay comprising: a p-amp; and a variable resistance circuit for varying the amplification degree of the OP-amp, which is commonly connected to the outputs of these OP-amps.