CN2438220Y

CN2438220Y - Loss-of-phase relay protector

Info

Publication number: CN2438220Y
Application number: CN 00228675
Authority: CN
Inventors: 张卫
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-06-27
Filing date: 2000-06-27
Publication date: 2001-07-04
Anticipated expiration: 2010-06-27

Abstract

The utility model relates to a phase loss relay protecting device and comprises a contacting device a for controlling the switching on and off processes of a power switch, a relay b for controlling the switching on and off processes of the contacting device, a rectifying circuit c for providing the working power of the relay and a sensing circuit d for sensing the phase position change of the power. The phase loss relay protecting device has the advantages of simple structure and stable and reliable work and can be used for the phase loss protecting device of the power.

Description

The phase shortage relay protector

The utility model belongs to a kind of phase shortage relay protector that is applicable to the three-phase electricity protection.

The present three-phase electricity open phase protector that uses; for example the patent No. is " the power supply open phase protector " of ZL9822212.7; with the patent No. be ZL97246418 " three-phase mains voltage formula open phase protector "; because (reliability or) complexity of circuit structure, have influence on the stability of its work and apply.

The purpose of this utility model provides the simple and direct phase shortage relay protector of a kind of circuit structure.

The utility model comprises a, and contactor is used to control the break-make of mains switch; B, relay is used for the break-make of control contactor; C, rectification circuit is used to provide the working power of relay; D, sensor circuit is used for the phase change of induction power supply.

Wherein, contactor links to each other with the normally-closed contact of relay, and place the relay normally open contact place, the normally opened contact of relay places respectively on A, B, the C phase line of three phase mains, motor is connected to A, B, the C phase line C of three phase mains, sensor circuit one end links to each other with the normally opened contact of relay, and the other end is connected with rectification circuit, and rectification circuit links to each other with relay again.

The utility model circuit structure is simple, and working stability is reliable, can be widely used in the open phase protector of power supply.

Accompanying drawing 1 is the utility model structural representation;

Accompanying drawing 2 is the utility model example structure schematic diagram.

As shown in Figure 1, the utility model comprises a, and contactor is used to control the break-make of mains switch; The b relay is used for the break-make of control contactor; C, rectification circuit is used to provide the working power of relay; D, sensor circuit is used for the phase change of induction power supply, contactor K selects for use coil to make, and rectification circuit is formed in parallel with capacitor C 4, diode D2 by bridge rectifier (D1), and sensor circuit is by three capacitor (C1, C2 C3) constitutes electric capacity (C1, C2, C3) (K1-3, K1-2's end K1-1) link to each other with the normally opened contact of relay respectively, be connected with rectification circuit after the other end parallel connection, relay J, diode D2, filter capacitor C4 also receive the output of bridge rectifier D 1.

Supply voltage just often, the T of contactor K, R end adds operating voltage, and the T terminal voltage makes coil K energising by the end that the J1-1 normally-closed contact is added to contactor coil K, and contactor K starts working, normally opened contact K1-1, K1-2, K1-3 closure, the motor D work of switching on, three-phase electricity is added in capacitor C1, C2, C3 one end simultaneously, capacitor low-pressure end F is approximately equal to zero to place N, relay J can not be worked because of no operating voltage, and contact J1-1 maintains the original state constant, and motor runs well.Appoint a scarce phase time at three-phase electricity A, B, C, or three-phase electricity height Voltage unbalance was greater than 30% o'clock, capacitor (C1, C2, C3) low-pressure end F and will rise to 10V to the voltage between the N of place, through rectifier D1, be added in filter capacitor C4 end charging time-delay after the rectification, delay time 0.5-1 second, filter capacitor C4 both end voltage will be raised to relay J work required voltage, relay J is started working, normally-closed contact J1-1 disconnects, contactor K dead electricity, and normally opened contact K1-1, K1-2, K1-3 reset, cut off three phase mains, motor D dead electricity and quitting work.Relay J is discharged time-delay after 0.5 second because of capacitor C4, and its both end voltage is lower than the operating voltage of relay J, and the relay J dead electricity quits work, and normally-closed contact J1-1 resets, for task is ready down.

As shown in Figure 2, output at rectifier D1, the automatic switching circuit, diode D2 and the relay J that are parallel with filter capacitor C4, constitute by voltage-stabiliser tube D3, one-way SCR D4, resistance R 2, between filter capacitor C4 one end and rectifier D1, can be connected in series current-limiting resistance R1, between diode D2 one end and automatic switching circuit, the circuit that serial connection is formed in parallel by divider resistance R3, boost capacitor C5, the circuit structure of remainder is identical with Fig. 1.

Claims

1, a kind of phase shortage relay protector is characterized in that comprising a, and contactor is used to control the break-make of mains switch; B, relay is used for the break-make of control contactor; C, rectification circuit is used to provide the working power of relay; D, sensor circuit is used for the phase change of induction power supply.

2, phase shortage relay protector according to claim 1; it is characterized in that contactor links to each other with the normally-closed contact of relay; and place the relay normally open contact place; the normally opened contact of relay places respectively on A, B, the C phase line of three phase mains; motor is connected to A, B, the C phase line C of three phase mains; sensor circuit one end links to each other with the normally opened contact of relay, and the other end is connected with rectification circuit, and rectification circuit links to each other with relay again.

3, phase shortage relay protector according to claim 1; it is characterized in that contactor K selects for use coil to make; rectification circuit is formed in parallel with capacitor C 4, diode D2 by bridge rectifier (D1); sensor circuit is by three capacitor (C1; C2; C3) constitute; electric capacity (C1; C2; C3) (K1-3, K1-2's end K1-1) link to each other with the normally opened contact of relay respectively; be connected with rectification circuit after the other end parallel connection, relay J, diode D2, filter capacitor C4 also receive the output of bridge rectifier D 1.

4, phase shortage relay protector according to claim 1; it is characterized in that output at rectifier D1; the automatic switching circuit, diode D2 and the relay J that are parallel with filter capacitor C4, constitute by voltage-stabiliser tube D3, one-way SCR D4, resistance R 2; between filter capacitor C4 one end and rectifier D1; can be connected in series current-limiting resistance R1; between diode D2 one end and automatic switching circuit; the circuit that serial connection is formed in parallel by divider resistance R3, boost capacitor C5, the circuit structure of remainder is identical with Fig. 1.