CN2162022Y

CN2162022Y - Induction phase-failure relay

Info

Publication number: CN2162022Y
Application number: CN 93228656
Authority: CN
Inventors: 李钟成
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-07-05
Filing date: 1993-07-05
Publication date: 1994-04-13
Anticipated expiration: 2003-07-05

Abstract

The utility model discloses an induction type open-phase relay, it comprises induction type current detector and current relay. The inductive current detector is a magnetic ring transformer with a group of coils wound on an annular magnetizer, a current relay is in a release state in a normal state, and a normally closed contact of the current relay is in a closed state. Two ends of the coil of the inductive current detector are respectively connected with two ends of the coil of the current relay. The open-phase relay can be combined with an AC contactor to be used as open-phase protection of three-phase electric appliances, when the open-phase relay is used, a three-phase electric wire passes through a ring of the annular magnetizer, and a contact of the current relay is connected in series to a branch of an auxiliary contact of the AC contactor related to the starting button.

Description

Induction phase interruption relay

The utility model relates to electrical relay, particularly three-phase electrical appliance protection relay.

In the prior art; in 1985 the 10th phases " CYBERSPACE " magazine, once disclosed " a kind of motor open-phase protection circuit of novelty "; this open-phase protection circuit is made up of three magnet ring current detectors and transistor circuit; have one to open circuit mutually in three-phase electricity, the current detector output current will change, the conducting of going oxide-semiconductor control transistors with end; again by transistorized on-off principle; remove trigger relay, make actuator's action, cut off motor power.This open-phase protection circuit has following shortcoming:

1, complex structure is made trouble,

2, the work of electronic circuit is the powered operation mode, and element and circuit easy break-down cause protective circuit malfunctioning.

The purpose of this utility model provides a kind of induction type open phase relay that does not have the powered operation mode.

The utility model is realized with the following method.

Allow three-phase wire from the ring of the annular magnetizer that is wound with coil, pass, when passing through three-phase current in the three-phase wire, can produce induced current in the coil, because the phase difference of three-phase electricity, the electric current that three-phase electricity produces in same coil is cancelled each other, making the induced current that produces in the above-mentioned coil is zero, when one opens circuit mutually, induced current in the above-mentioned coil just no longer is zero, can the trigger current relay with this induced current, output switching signal if go to trigger the A.C. contactor action with this switch, then can cut off three phase mains.By above-mentioned principle,, just can make the induction type open phase relay with magnetic ring transformer that is wound with one group of coil on the annular magnetizer and current relay.

The utility model has the advantages that:

1, circuit is simple, uses element few, makes easily, and is cheap,

2, the work of protective circuit is no powered operation mode, element long service life, reliable operation.

The utility model is described in further detail below in conjunction with accompanying drawing.

Fig. 1 is an induction type phase failure relay element floor plan,

Fig. 2 is the A-A face end view of Fig. 1,

Fig. 3 is the induction type open phase relay combines the open phase protection of making the three-phase electrical appliance with A.C. contactor a circuit diagram.

Among Fig. 1, Fig. 2, the induction type open phase relay is made up of induction type current detector 1 and current relay 2.They are fixed on the same base plate 3, and there is binding post 5 outside with shell 4 cappings on the shell 4.

Induction type current detector 1 is the magnetic ring transformer that is wound with one group of coil 12 on annular magnetizer 11, can adopt the common straight-through current transformer of 380V to serve as, current relay 2 in its coil, do not have electric current by the time be that release condition, normally closed interlock are closure state.

Current detector/the two ends of coil 12 link to each other with the coil two ends of current relay 2 respectively, the contact of current relay is received on the binding post 5.

Among Fig. 3; when doing the protection of three-phase electrical appliance in conjunction with A.C. contactor with the induction type open phase relay; allow three-phase wire from the ring of magnetic ring transformer, pass; the mode of connection of A.C. contactor is to similar as the connection of three-phase electrical appliance switch, different is make the contact of current relay be connected on the branch road that starts the auxiliary contact that connect button A.C. contactor in parallel on.

Claims

1, a kind of induction type open phase relay, it has induction type current detector and the current relay that is wound with one group of coil on the annular magnetizer, it is characterized in that: the coil two ends of induction type current detector are connected with the coil two ends of current relay respectively.

2,, it is characterized in that by the described open phase relay of claim 1: described current relay be in its coil, do not have electric current by the time be release condition, its normally closed interlock is the relay of closure state.