CN87210736U

CN87210736U - Ac contactor for phase-breaking protection

Info

Publication number: CN87210736U
Application number: CN 87210736
Authority: CN
Inventors: 孙祖桐; 宋墨兰
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-11-13
Filing date: 1987-11-13
Publication date: 1988-09-21

Abstract

The utility model discloses an alternating current contactor for phase-breaking protection, comprising two control loops. A contact point ZJ-[1] of a sucking coil Q and an alternating current relay ZJ is connected in one loop, and an auxiliary contact Q1 of the alternating current relay ZJ and an alternating current contactor is connected in the other loop, so that the two loops can be controlled each other; accordingly, when phase is broken, a power source can be cut off in time to guarantee the safety of electric appliances. The utility model has the advantages of simple structure, low cost, convenient operation and safe reliability.

Description

AC contactor for phase-breaking protection

The utility model belongs to the improvement invention to A.C. contactor, makes A.C. contactor have the open phase protection effect, is suitable for connecting or the disjunction power supply, and guarantees the safe operation of electrical appliance equipment.

Present widely used A.C. contactor has only a control loop, and sucking coil and auxiliary contact are housed in this loop.When using A.C. contactor, and three phase mains has two kinds of connecting modes: a kind of is that sucking coil, auxiliary contact and start button, stop button with A.C. contactor is connected in the loop between wantonly two phase voltages of three phase mains; Another kind is that the sucking coil of A.C. contactor and auxiliary contact and start button, stop button are connected in a certain phase voltage and the loop between the zero line of power supply; but because A.C. contactor has only a control loop; connect howsoever all and can only shield one or two phase voltages; still can cause the phase-deficient operation of electric equipments such as motor, burn electric equipment.For the three-phase voltage to power supply all shields; just must in above-mentioned two kinds of control loops, respectively insert the open phase protection RJ of bimetal thermal relay and so on; because this open phase protection is an independent device; so cost is than higher; trouble is installed; reliability is also relatively poor, though applied, desirable not to the utmost.

The objective of the invention is to design a kind of simple in structure, cost is low, the three phase mains open phase protection A.C. contactor and the operating circuit thereof of dependable performance.

Fig. 1, Fig. 2 are the working circuit diagrams of existing A.C. contactor.Be the line map of A.C. contactor in the frame of broken lines among the figure;

Fig. 3, Fig. 4, Fig. 5, Fig. 6 are the operating circuit schematic diagrams of the different connecting modes of open phase protection A.C. contactor.Be the line map of open phase protection A.C. contactor in the frame of broken lines among the figure, D is an electric equipment, and N is a zero line.

A.C. contactor is by main contact Z, auxiliary contact Q ₁, last electromagnet, lower electromagnet, sucking coil Q, arc-extinguish chamber and base are formed.Characteristics of the present invention are that two control loops are housed in this contactor, and the auxiliary contact Q1 of an AC relay ZJ and A.C. contactor is housed in loop, are connected to the sucking coil Q of A.C. contactor and the contact ZJ of AC relay ZJ in another loop ₁, one of them loop is earlier the contact ZJ of button QA and relay ZJ ₁(or contactor auxiliary contact Q ₁) parallel connection, again with button TA, contactor sucking coil Q(or relay ZJ) be composed in series.Two control loops of open phase protection A.C. contactor are connected on respectively between any two voltages of three phase mains, and between another phase voltage and zero line of three phase mains.The sucking coil Q that so just makes AC relay ZJ and A.C. contactor respectively in two loops, AC relay ZJ and its contact ZJ ₁, sucking coil Q and auxiliary contact Q ₁Also respectively in two loops, just form two loops function of control mutually.Fig. 3 to Fig. 6 is two control loops of open phase protection A.C. contactor and the different connecting modes of three phase mains.Its operating principle is expressed as f _Q=ZJ ₁f _ZJ=TA(QA+Q ₁) or f _Q=TA(QA+ZJ ₁), f _ZJ=Q ₁At f _Q=ZJ ₁In the formula, f _QExpression contactor operate condition, ZJ ₁Expression action of relay contact state is worked as ZJ ₁=0, when promptly relay tip disconnects, f then _Q=0 contactor disconnects; Work as ZJ ₁=1, when promptly relay tip is closed, f then _Q=1, relay closes.At f _ZJ=TA(QA+Q1) in the formula, f _ZJExpression actuating of relay state, f _ZJ=1 o'clock, relay adhesive, f _ZJ=0 o'clock, not adhesive of relay.TA represents button TA operate condition, during TA=0, and button actions, button disconnects; During TA=1, button is failure to actuate, the button closure.QA represents button QA operate condition, during the QA action, is closure state QA=1; When being failure to actuate, for disconnecting QA=0.Q ₁Expression contactor auxiliary contact operate condition, closed Q during action ₁Be 1, disconnect Q when being failure to actuate ₁Be 0.

By f _ZJ=TA(QA+Q ₁) formula as can be known, as QA, Q ₁, TA is failure to actuate, or QA, Q ₁In an action is arranged, when TA also moves, f _ZJBe 0; As QA, Q ₁An action is arranged, when TA is failure to actuate, f _ZJBe 1, f _Q=TA(QA+ZJ ₁), f _ZJ=Q ₁, move in former the same.

When sucking coil Q or AC relay ZJ are installed between two phase voltages in the loop, its coil voltage is for exchanging 380V, when being installed in the loop between a phase voltage and the zero line, its coil voltage is an alternating current 220V, start button QA, stop button TA can be installed in arbitrary loop.

Used AC relay ZJ is a small high-power relay in the control loop, can adopt JTX series general-purpose relay, and this relay ZJ can be installed in the suitable clear position of A.C. contactor, can be placed on below the base, also can be placed on above the base.

Be the operation principle of example explanation open phase protection A.C. contactor now with Fig. 3: start QA, electric current flows to zero line from the B phase voltage by ZJ, QA, TA, meanwhile ZJ ₁Closure has electric current in the sucking coil Q, electromagnetic actuation, main contact Z, auxiliary contact Q ₁All closed, ensure to the three phase supply of electric equipment such as motor, equipment normally moves.When A mutually or C when cutting off the power supply mutually, no current among the sucking coil Q, electromagnet discharges, and makes the auxiliary contact disjunction in another loop, no current in the AC relay ZJ, its contact ZJ ₁Disjunction, like this, two equal no currents in loop of open phase protection A.C. contactor pass through, and main contact is disconnected, and stop to same electric power supply.Equally, during the phase failure of B phase, no current in the AC relay ZJ makes its contact ZJ in another loop ₁Disjunction, no current in the sucking coil Q.Electromagnet discharges, and main contact Z, the equal disjunction of auxiliary contact Q stop to power to electrical appliance.The mode of this two loops intersection control as long as a phase power supply phase failure is arranged, just can be cut off three phase mains rapidly reliably, guarantees the safety of electrical appliance.

In like manner press the electric current that TA can cut off two loops of open phase protection A.C. contactor, electromagnet is discharged, the main contact disjunction stops to power devices.

The operation principle of Fig. 4 to Fig. 6 circuit is also the same with Fig. 3 substantially, no longer one by one narration.

The utility model is compared with open phase protections such as bimetal thermal relays, has simple in structure, cheap, dependable performance, the advantage such as easy to use.

Utilize technique scheme at existing homemade CJ _10-60-AC380VThe base of A.C. contactor below; the open phase protection A.C. contactor that the AC relay of a JTX-AC220V type of installation is made; two control loops are arranged; be connected to AC relay and auxiliary contact in the loop; be connected to a contact of sucking coil and AC relay in another control loop; through using, safe and reliable, effect is fine.

Claims

1, a kind of by main contact Z, auxiliary contact Q ₁, base, go up the open phase protection A.C. contactor that electromagnet, lower electromagnet, sucking coil Q, arc-extinguish chamber are formed, it is characterized in that:

A) two control loops are arranged in this contactor, be connected to the auxiliary contact Q of AC relay ZJ and A.C. contactor in loop ₁, be connected to the sucking coil Q of A.C. contactor and the contact ZJ of AC relay ZJ in another loop ₁

B) in two control loops, one of them loop is earlier the contact ZJ of button QA and relay ZJ ₁(or contactor auxiliary contact Q ₁) parallel connection, be composed in series with button TA, contactor sucking coil Q (or relay ZJ) again,

C) two of this contactor loops are connected between any two phase voltages of three phase mains respectively and between another phase voltage and zero line of three phase mains.