CN2347293Y

CN2347293Y - Loss of phase breaker

Info

Publication number: CN2347293Y
Application number: CN 98240534
Authority: CN
Inventors: 胡理想
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-09-14
Filing date: 1998-09-14
Publication date: 1999-11-03
Anticipated expiration: 2008-09-14

Abstract

The utility model a phase interruption breaker, which is mainly composed of a three-phase rectifying circuit, a phase interruption control circuit and a delay tripping circuit. The utility model is characterized in that the phase interruption control circuit is composed of three controlled silicon and one relay which are connected in series, and the trigger electrode of each controlled silicon is respectively connected with a current mutual inductor which is sheathed on each electrode conducting wire of a three-phase main power supply; the delay tripping circuit is composed of one controlled silicon and one relay which are connected in series, three current mutual inductors which are connected in parallel are connected in a loop, and the three current mutual inductors are connected in parallel with a delay capacitor and the contact switch JK1 of a relay J1. Therefore, the utility model has the characteristics of simple structure, small volume, general purpose for large and small currents, etc., and the utility model can perform favorably protecting action on motors.

Description

Phase failure circuit breaker

The utility model relates to a kind of automatic air phase failure circuit breaker that is derived from by automatic air circuit breaker, it is the protection component of low voltage motor, belongs to industrial low-voltage electrical apparatus class.

At present automatic air circuit breaker is mainly leaned in the protection of motor; because of it has reliably instantaneous and deferred action protection curve characteristic and contact have higher breaking capacity and good arc-control device; its every technical indicator all meets country and the design of international related standards; therefore it is rational at present motor protection element; but it lacks a kind of phase failure protection function to motor; in case circuit generation phase failure accident, motor can not get its protection at short notice and damages.Various open phase relays and integrated protector for electric motor are arranged on the market in addition; it all will with the supporting use of A.C. contactor; perhaps can only be installed in the A.C. contactor below; therefore breaking capacity is low; do not meet as power circuit open circuit protection element; it does not consider the operating characteristic of motor, merely increases the kinds of protect function at design aspect, does not consider product performance and relevant technologies standard.All only considered their defencive function as disclosed technical scheme in Chinese invention patent application (application number 94118377.7) and Chinese utility model patent (94219169.2), and do not understand the motor genuine property in when work, they do not meet relative national standards and JB/DQ4284-87 motor protection with stipulating in the circuit breaker; Operating characteristics 1:1.2 moved in 2 hours.The characteristic rice that this index does not also have electronic circuit to produce rice at present replaces bimetallic hot protective feature curve; therefore utilize integrated protector for electric motor regular meeting in the protection motor procedure of electronic circuit and integrated circuit to bring misoperation at present, directly influence the ordinary production of enterprise.In addition, motor is to be in the overburden state when running into phase failure accident, it has only a two-phase and a power supply mutually, the electric current that passes through increases, at this moment contact is in the high breaking state, the contact and the arc-control device of high breaking energy should be arranged, otherwise contact will be burnt out, hence one can see that, above-mentioned 94118377.7 applications for a patent for invention and 94219169.2 they all do not accomplish.

The purpose of this utility model is to overcome the deficiency of above-mentioned existence, and a kind of volume is little, the scope of application is wide, big or small electric current is general and provide, and can carry out the phase failure circuit breaker of reliable open phase protection to motor.

The purpose of this utility model is finished by following technical solution, it mainly is made of rectified three-phase circuit, phase failure control circuit and delayed tripping circuit, rectified three-phase circuit is connected on the three-phase main power circuit, be connected to the phase failure control circuit that is connected in series mutually by three controllable silicons and relay J 1 thereafter, be serially connected with an instrument transformer that is inserted in respectively on each polar conductor of three-phase main power source on every silicon controlled trigger electrode, and relay contact switch JK1 is access in the delayed tripping circuit.

Delayed tripping circuit described in the utility model is composed in series by a controllable silicon and a relay J 2, in another loop of silicon controlled, be connected to three instrument transformers that are connected in parallel and are inserted in respectively on each polar conductor of three-phase main power source, and on this loop, go back and be connected to delay electric capacity and relay switch JK1.

In addition, the utility model also is connected to piezo-resistance in rectified three-phase circuit, and it can play anti-lightning strike effect.

Accompanying drawing is circuit theory diagrams of the present utility model.

To be described in detail the utility model by accompanying drawing below: the utility model mainly is made of rectified three-phase circuit, phase failure control circuit and delay control circuit.A on the rectified three-phase circuit, B, C three places are connected to respectively on the three-phase main power circuit, and every commutating phase circuit is formed by bridge rectifier D 1, is connected to piezo-resistance RV1, RV2 between the phase, so that play anti-lightning strike effect.Also be connected to resistance R 1 and capacitor C 1 parallelled circuit on rectified three-phase circuit, they can reduce direct voltage to offer the work of phase failure control circuit.

Phase failure control circuit is in series by three controllable silicon SCR1, SCR2, SCR3 and relay J 1, on every silicon controlled trigger electrode, be connected to a bridge rectifier D 2, D3, D4 and corresponding current transformer L1, L3, L5, and above-mentioned three current transformer L1, L3, L5 are inserted in respectively on each polar conductor of three-phase main power source.On three silicon controlled trigger electrodes, also respectively be connected to filter capacitor C2, a C3, C4 in addition.Go back and be connected to capacitor C 5 with relay J 1, this capacitor C 5 can improve the reliability of phase failure control, closes controllable silicon smoothly.

The delayed tripping circuit mainly is in series by controllable silicon SCR 4 and relay J 2, and in series loop, also be connected in parallel three bridge rectifier D 5, D6, D7 and damping capacitor R2, respectively be connected to current transformer L2, L4, the L6 that is inserted on each polar conductor of three-phase main power source at the two ends of three rectifiers, be parallel with shunt resistance R3 respectively and postpone electric capacity C6 with bridge rectifier and resistance R 2.

During motor work, three current transformer L1, L3 in the phase failure control circuit, L5 will go out the above voltage of 0.8V by tens mA inductions by current, will induce about the highest saturation voltage 2V if any peace electric currents up to a hundred, these induced voltages are through each group bridge rectifier D 2, D3, D4 rectification and capacitor C 2, C3, C4 filtering voltage regulation, simultaneously trigger corresponding controllable silicon turn-on power separately, make relay J 1 work.In case any phase phase failure accident takes place in main power source, its current transformer does not just have electric current and flows through, there is not induced current, this moment, bridge rectifier D 1 has moment to fall voltage, capacitor C 5 is in high voltage and returns discharge to controllable silicon, makes controllable silicon close gate circuit smoothly, and relay J 1 is quit work.It is normal that the delayed tripping circuit recovers, at this moment one that needs only among current transformer L2, L4, the L6 does not have electric current can not induce outside the electric current, all the other two all have the above induced voltage of 0.8v, wherein be connected in parallel on after the rectification of two bridge rectifiers outside R2 damping and R3 shunt resistance stop through D7, D6, D5, come time of delay by C6 large bulk capacitance charging mainly that (time length is that the amount of capacity by capacitor C 6 decides, generally in 1 to 4S time.It can recover normal automatically in delay time if during misoperation; if the phase failure exceeds time of delay; C6 charging has just reached controllable silicon SCR 4 trigger voltages makes SCR4 conducting tripping relay J2 action, and main contact tripping operation (phase failure circuit breaker trip) is played protection to motor.

The utility model compared with prior art has simple in structurely, and volume is little, and the scope of application is wide, the size electricity Circulation usefulness with just deriving from into loss of phase breaker in it automatic air circuit breaker of directly packing into, need not and it during installation Supporting and the debugging of its element has been satisfied the functions such as overload to motor, short circuit, disconnected phase, under-voltage, overvoltage and has been wanted Ask, can be to characteristics such as motor play a good protection.

Claims

1, a kind of phase failure circuit breaker, it is characterized in that it is made of rectified three-phase circuit, phase failure control circuit and delayed tripping circuit, rectified three-phase circuit is connected on the three-phase main power circuit, be connected to the phase failure control circuit that is in series and forms by three controllable silicon SCR1, SCR2, SCR3 and relay J 1 thereafter, be serially connected with instrument transformer L1, L3, a L5 who is inserted in respectively on each polar conductor of three-phase main power source on every silicon controlled trigger electrode, and the contact switch JK1 of relay J 1 inserts in the delayed tripping circuit.

2, phase failure circuit breaker as claimed in claim 1, it is characterized in that described delayed tripping circuit is composed in series by controllable silicon SCR 4 and relay J 2, in the series loop of controllable silicon SCR 4, be connected to three current transformer L2, L4, L6 that are connected in parallel and are inserted in respectively on each polar conductor of three-phase main power source, and trigger the contact switch JK1 that is connected to delay electric capacity C6 and relay J 1 on the loop at silicon controlled.

3, phase failure circuit breaker as claimed in claim 1 or 2 is characterized in that being connected in the described rectified three-phase circuit piezo-resistance RV1 and RV2.