CN2285022Y - AC three-phase balance protecting controller - Google Patents

Abstract

The utility model relates to an AC three-phase balance protecting controller which is used for the phase failure protection, loss and under voltage protection, etc. of the three-phase electric appliances, such as three-phase motors, etc. The utility model is composed of three sets of protecting control mechanisms with the same structure, and each set of mechanisms is mainly composed of a main and a secondary contacts, a contact supporting frame, an iron core magnet coil, and a moving and a static iron cores. The wire outlet end of the first set of normally open contacts is connected with the wire inlet end of the second set of iron core magnet coils, and the wire outlet end of the second set of normally open contacts is connected with the wire inlet end of the third set of iron core magnet coils; the wire outlet end of the third set of normally open contacts is connected with the wire inlet end of the first set of iron core magnet coils, and the wire outlet ends of the three sets of iron core magnet coils are connected mutually to form a three-phase balance protecting system.

Description

Exchange three-phase equilibrium protection controller

The utility model relates to a kind of protection controller that exchanges the three-phase power consumption equipment.

Exchange three-phase electrical appliance such as threephase motor in running, usually because of short circuit, overload, decompression, under-voltage, all kinds of faults such as the phase failure and can not safe operation.Wherein open phase fault causes the three-phase power supply system disequilibrium, makes power consumption equipment move at the situation continued of phase shortage, causes overload, overcurrent, overheat condition to take place then, causes the damage of equipment.And electrical equipment such as present employed A.C. contactor, relay, air circuit all do not possess the open-phase protection function.At present, though can realize open-phase protection indirectly by being used of A.C. contactor and thermal relay, owing to can not directly solve the phase-deficient operation problem, and its protective effect is very limited.

The purpose of this utility model is to provide a kind of three-phase equilibrium protection controller that possesses the open-phase protection function, can be when the three phase mains generation phase failure situation instantaneous trip power supply, with the safety of protection three-phase electrical appliance.

The utility model is achieved in that this three-phase equilibrium protection controller is with reference to the structure and the operating principle of prior art three-phase ac contactor; be by A; B; the protection controlling organization that three groups of structures of C are identical (is organized hereinafter to be referred as A; the B group; the C group) forms; by this A group; the B group; C organizes three groups of protection controlling organizations and constitutes three-phase equilibrium protection control system; every group of protection controlling organization is mainly by the main contact that is used for the break-make single phase poaer supply; the attached contact normally open contact that helps of control loop; normally closed interlock; contact supporting; the iron core solenoid; moving; static iron core is formed; the main contact end of incoming cables connects with the end of incoming cables of normally open contact; between three groups of protection controlling organizations; the leading-out terminal of A group normally open contact connects with the end of incoming cables of B group iron core solenoid; the leading-out terminal of B group normally open contact connects with the end of incoming cables of C group iron core solenoid; the leading-out terminal of C group normally open contact connects the A group with the end of incoming cables of A group iron core solenoid; the B group; the leading-out terminal of C group iron core solenoid is coupled to each other.Through adopting said structure, with the corresponding the utility model A group that inserts of three-phase power line, the B group, the main contact loop of C group, its control loop then forms the closed protection loop that three phase mains is gone forward one by one between phase and phase and controls: if make A, B, any one group (first group) iron core solenoid energising (finishing) among three groups of the C by outside connected switch, then should organize main contact and normally open contact adhesive, the closure of this group normally open contact makes next group (second group) the iron core solenoid energising that connects with it, and make the main contact and the normally open contact adhesive of this group, the closure of this group normally open contact makes the energising of joining with it next group (the 3rd group) iron core solenoid, and make the main contact and the normally open contact adhesive of this group, the closure of this group normally open contact makes joining with it next group (promptly first group) iron core solenoid keep energising and this group main contact and normally open contact is remained closed, and makes the three-phase circuit normal operation input; If arbitrary phase phase failure appears in three phase mains; then with this joining one group of main contact and normally open contact dead electricity of protecting controlling organization; the dead electricity of this group normally open contact makes next group (first group) the iron core electromagnetic coil dead electricity that connects with it; this group main contact and normally open contact disconnect; the disconnection of this group normally open contact makes next group (second group) the iron core solenoid dead electricity that connects with it; this group main contact and normally open contact disconnect; it is one group of iron core solenoid dead electricity of the above-mentioned phase failure that the disconnection of this group normally open contact makes next group (the 3rd group) that connects with it; this group main contact and normally open contact disconnect; thereby disconnect three phase mains in moment, finish protection.

The utility model has the advantages that simple in structurely, dependable performance is not subjected to the influence of ambient temperature, can move under various complex situations and air-proof condition.Be used with suitable switch and fuse, can finish the start-stop operation under the normal condition, not only energy auto power off when the phase failure; protection equipment and circuit; and can play short circuit, overload, decompression, under-voltage protective effect realize the omnibearing protection to power consumption equipment.The utility model is applicable in three-phase three-wire system and the three-phase four-wire system circuit protection and the control to three-phase electrical appliances such as threephase motors.

Below in conjunction with accompanying drawing the utility model is further specified.

Fig. 1 is the utility model structural representation.

Fig. 2 is the threephase motor protection control circuit figure that the utility model and Electromagnetic push-button are formed.

According to Fig. 1, the utlity model has shell 1, be provided with A, B, protection controlling organization 2 that three groups of structures of C are identical in the shell 1, this mechanism is mainly by main contact 3, the attached contact 4 that helps, contact supporting 5, iron core solenoid 6, moving iron core 7, static iron core 8 is formed.

According to Fig. 2; the A phase line of phase three-wire three power supply connects with motor D via fuse 9 and first group of protection of the utility model controlling organization (A group) main contact 13; the B phase line connects with motor D via fuse 10 and second group of protection of the utility model controlling organization (B group) main contact 15, and the C phase line connects with motor D via fuse 11 and the 3rd group of protection of the utility model controlling organization (C group) main contact 17.Its protection Control work process is as follows: deciliter switch 20 closes; B phase power supply then constitutes path through the coil C4 and the A group normally closed interlock 12 of Electromagnetic push-button; Electromagnetic push-button coil C4 gets; make Electromagnetic push-button normally open contact 19 closures; thereby the A of series connection group iron core solenoid C1 gets with it; normally open contact 14 closures also get B group iron core solenoid C2; normally open contact 16 closures also get C group iron core solenoid C3; normally open contact 18 closures also make A group iron core solenoid C1 keep "on" position; this moment, normally closed interlock 12 was opened; Electromagnetic push-button coil C4 dead electricity quits work; at this moment; main contact 13; 15; 17 closed work, (this process was finished in moment), thus make the main circuit normal operation input.Need stop motor D when work, disconnect deciliter switch 20, this moment, normally open contact 16 dead electricity and make iron core solenoid C3 dead electricity made C1 and C2 dead electricity in succession, and the threephase motor circuit disconnects also and quitting work.If in the phase failure of motor emerged in operation, as the phase failure of A phase, then normally open contact 14 dead electricity and make the C2 dead electricity make C3, C1 dead electricity then, and three phase mains is cut off, and finish automatic protection.When the normal emerged in operation decompression of motor, undervoltage condition, also can when three phase mains is in poised state, resume operation automatically at the instantaneous trip power supply.

Claims (1)

1; a kind of interchange three-phase equilibrium protection controller; it is characterized in that: be by A; B; the protection controlling organization that three groups of structures of C are identical is formed; each group protection controlling organization is mainly by the main contact that is used for the break-make single phase poaer supply; the attached contact that helps of the normally-open normally-close of control loop; contact supporting; the iron core solenoid; moving; static iron core is formed; its main contact end of incoming cables and normally open contact end of incoming cables link; between three groups of protection controlling organizations; the leading-out terminal of A group normally open contact connects with the end of incoming cables of B group iron core solenoid; the leading-out terminal of B group normally open contact connects with the end of incoming cables of C group iron core electromagnetic coil; the leading-out terminal of C group normally open contact connects the A group with the end of incoming cables of A group iron core solenoid; the B group; the leading-out terminal of C group iron core solenoid is coupled to each other.

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