CN2239673Y

CN2239673Y - Phase sequence relay having automatic phase changing

Info

Publication number: CN2239673Y
Application number: CN 95243901
Authority: CN
Inventors: 傅勋
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-05-02
Filing date: 1995-05-02
Publication date: 1996-11-06
Anticipated expiration: 2005-05-02

Abstract

The utility model relates to a phase sequence relay having automatic phase changing. The loops of a positive and a negative sequence relays and the loop of an open-phase relay are connected with the position between the C phase and the B phase in an A, power supply, a B power supply and a C power supply. The contact points of the positive and the negative sequence relays and the open-phase relay are assembled into two groups of combination contact points. One end of the first group of combination contact points is connected with the A phase, and the other end is connected with the B phase after additionally connected with a phase converter. The utility model can make the three-phase electricity reversed automatically when the error appears. When the phase is broken, a motor is stopped and protected. One end of the second group of combination contact points is connected with the B phase, and the other end is connected with the C phase after additionally connected with a control circuit. The utility model can perform the function of monitoring phases and changing phases by the manual operation. Because the relay has the function of changing phases automatically, the utility model prolongs the service life of the equipment, and the utility model increases work efficiency.

Description

The phase sequence relay of automatic commutation

The utility model relates to a kind of phase sequence relay, suitable do automatic commutation when misphase is appearred in phase order of 3-phase AC and uses.

The patent that the applicant has now had " the phase sequence relay " (patent No.: cut off electrical system in the time of 93225811.5) and backward, the phase failure occurring and use as the positive backward of differentiating phase order of 3-phase AC and phase failure indication, but can not make backward change positive sequence into automatically, can only move phase by armrest, thereby influence the operating efficiency and the useful life of motor.

The purpose of this utility model is that design a kind ofly can be declared just, backward can automatically switch into positive sequence again with the phase failure when backward occurring, thereby makes electric system keep the phase sequence relay of the automatic commutation that normally moves.

The purpose of this utility model is achieved in that and places the electric line structure of the phase sequence relay in the box body to be: A, B, C in the C three phase mains is through being connected to a rectifier with B between mutually after the phase shift of RC phase shifter, the output of rectifier also connects a filtering load circuit and a positive backward relay, be connected to a step-down rectifier loop at B and C between mutually, the output in step-down rectifier loop is connected to an open phase relay, the combination contact that the contact of said positive backward relay and open phase relay is formed has two groups, first group is that the normally opened contact of open phase relay and a transfer contact of positive backward relay are connected into a combination contact, one termination A phase of this first group combination contact, the other end is that two transfer contact ends are as output, second group is that the normally opened contact of open phase relay and the normally opened contact of positive backward relay are connected into a combination contact, one termination B phase of this second group combination contact, the other end is as output.The outputs of these two groups combination contacts can be differentiated commutation automatically again after connecting external electric wiring when misphase, phase shortage appear in three phase mains.

The phase sequence relay that uses this automatic commutation is to using the motor and the work mechanism of three-phase alternating current work; before starting this; when taking place, misphase, phase shortage can shield; and can automatic commutation when misphase; the irreversible equipment of three-phase (water pump, fan, elevator etc.) is played prison reach protective effect mutually, prolong service life of equipment and guarantee equipment safety operation.

Details are as follows to structure of the present utility model below in conjunction with the accompanying drawing of an embodiment:

Fig. 1: outline drawing.

Fig. 2: the electronic circuit schematic diagram of this relay and first group of combination contact user mode figure thereof.

Fig. 3: second group of combination contact user mode figure of this relay.

The utility model is by box body 1, panel 2, place the electric line structure of the phase sequence relay in the box body to form, wherein the electric line structure of phase sequence relay is: A, B, C in the C three phase mains is via resistance R 1, be connected to a rectifier V who forms by diode V1-V4 with B between mutually after the RC phase shifter phase shift that capacitor C 3 is formed, the output of rectifier V also connects one by capacitor C 1, filtering load circuit and a positive backward relay K 1 that resistance R 3 is formed, B and C mutually between, be connected to one by resistance R 4, the step-down rectifier that diode V5 and capacitor C 2 are formed adds the road, and the output in step-down rectifier loop is connected to an open phase relay K2.Positive backward relay K 1 has two groups with the combination contact that the contact of open phase relay K2 is formed; first group is that the normally opened contact K21 of open phase relay and a transfer contact K11 of positive backward relay are connected into a combination contact; one termination A phase of this first group combination contact; the other end is that two transfer contact ends are as output; output can an external as shown in Figure 2 phase changer; the structure of phase changer is: normally-closed contact ZC1 and an antikinesis contactor FC of a forward operation of the normal-closed end serial connection contactor of the transfer contact K11 of positive backward relay; the normally-closed contact FC1 of an antikinesis contactor of its Chang Kaiduan serial connection and a forward operation contactor ZC; after moving contactor ZC and the common junction of antikinesis contactor FC is drawn, forward receives B mutually; three phase mains A; B; meet the normally opened contact ZC2-ZC4 of a pair of forward operation contactor between C inlet wire and the motor 1M respectively; and A is alternate with C; C and A are alternate; B moves the normally opened contact FC2-FC4 of a pair of antikinesis contactor of two terminations of contactor normally opened contact ZC2-ZC4 mutually respectively at forward between itself; when power supply place positive sequence; positive backward relay K 1 and the equal adhesive of open phase relay K2; the forward operation contactor ZC loop of first group of combination contact is connected; the motor place normally moves; when backward occurring; then positive backward relay K 1 not adhesive; and open phase relay K2 adhesive; the antikinesis contactor FC loop of first group of combination contact is connected; normally opened contact FC2-FC4 closure; reach the purpose of automatic commutation; if during the phase failure; then first group of combination contact becomes off state; or combination contact output outage; forward operation contactor ZC and the equal no power of antikinesis contactor FC; the normally opened contact ZC2-ZC4 of these two contactors then; all not adhesives of FC2-FC4; motor is failure to actuate, and reaches protection motor purpose.Figure 3 shows that the user mode figure that uses second group of combination contact, connected and form with backward relay normally open contact K12 just by open phase relay normally opened contact K22 in second group of combination contact, one termination B phase, receive the C phase behind the external control circuit of the other end, S1 is a start button in the control circuit, S2 is a stop button, K3 is a contactor, K4 is a thermal relay, K31 is the contactor normally opened contact, K41 is a thermal relay normally closed contact, F is a fuse, and second group of combination contact is connected on the JX base, all can cause motor not rotate when the phase failure or misphase occurring, as will recovering normally manually commutation, so this relay also maintains the manual reverse of direction function after second group of combination contact arranged.

Claims

A kind of phase sequence relay of automatic commutation, by box body, panel and place the electric line structure of the phase sequence relay in the box body to form, the electric line structure that it is characterized in that phase sequence relay is: A, B, C in the C three phase mains is through being connected to a rectifier with B between mutually after the phase shift of RC phase shifter, the output of rectifier also connects a filtering load circuit and a positive backward relay, be connected to a step-down rectifier loop at B and C between mutually, the output in step-down rectifier loop is connected to an open phase relay, the combination contact that the contact of said positive backward relay and open phase relay is formed has two groups, first group is that the normally opened contact of open phase relay and a transfer contact of positive backward relay are connected into a combination contact, one termination A phase of this first group combination contact, the other end is that two transfer contact ends are as output, second group is that the normally opened contact of open phase relay and the normally opened contact of positive backward relay are connected into a combination contact, one termination B phase of this second group combination contact, the other end is as output.