JPS5997536U

JPS5997536U - negative sequence current relay

Info

Publication number: JPS5997536U
Application number: JP19323582U
Authority: JP
Inventors: 秋沢　安郎
Original assignee: 株式会社日立製作所
Priority date: 1982-12-22
Filing date: 1982-12-22
Publication date: 1984-07-02

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 the drawing]

第１図は従来の逆相電流継電器の動作原理を説明する回
路図、第２図は逆相フィルタの動作を説明するベクトル
図、第３図は本考案の実施例を示、　す回路図、第４図
は本考案の動作を説明するタイ１．２・・・・・・入カ
ドランス、ｉ・・・・・・コンデンサ、４、　５．　６
．　７・・・・・・抵抗器、８・・・・・・整流器、９
゜１２．１３・・・・・・レベル検出器、１０．１１・
・・・・・出力リレー及びその接点、１４・・・・・・
位相検出器。＼−、Ｉ７１　／（ニー−より）　　　　ｊ −−−（Ｉａ−ＩＣ）＝ＶＺ＋Ａ、。− ＼ −ゴエＡ−ＩＣ）−ＶｚFIG. 1 is a circuit diagram explaining the operating principle of a conventional negative phase current relay, FIG. 2 is a vector diagram explaining the operation of a negative phase filter, and FIG. 3 is a circuit diagram showing an embodiment of the present invention. Figure 4 explains the operation of the present invention.Tie 1.2... Input transformer, i... Capacitor, 4, 5. 6
．． 7... Resistor, 8... Rectifier, 9
゜12.13・・・Level detector, 10.11・
...Output relay and its contacts, 14...
Phase detector. \-, I71 / (from knee) j --- (Ia-IC) = VZ +A,. - \ -Goe A-IC) -Vz

Claims

[Scope of utility model registration request]

' When the phase order of the power supply voltage of a three-phase motor is incorrectly connected in reverse, a negative sequence current flows in the input current of the motor, so
In a negative-sequence current relay whose purpose is to detect abnormalities and protect the motor, a first current transformer extracts the difference between the A-phase current and the B-phase current, and a A second current transformer that takes out the difference, an impedance for deriving a voltage V1 that is 60 degrees behind the secondary current of the first current transformer, and a second current transformer that outputs the secondary current of the second current transformer. an impedance for deriving the voltage 2 in the opposite direction, and a phase comparator circuit that converts V1 and V2 into rectangular waves, compares the phases of the two, and outputs an operating output when the phase difference is within a predetermined angle. A negative sequence current relay characterized by comprising:
−