DD268569A1 - SWITCHING DEVICE FOR A STAR TRIANGLE SHOE - Google Patents

Abstract

The invention relates to a switching device for a star-triangle Schuetz. The aim of the invention is to provide a switching device that reduces the cost of material, space and time. According to the invention, this is achieved by constructing a contactor with three contact planes, wherein the power contactor, the star contactor, the delta contactor and the time relay are integrated in one assembly.

Description

For this 3 pages drawings

Field of application of the invention

The invention relates to a switching device for a star-delta contactor, which can be used for starting higher-speed orehstrom squirrel-cage motors.

Characteristic of the known technical solution

There are known Stern-Dreieck contactors, which are realized on the basis of the TGL 28-9612 as an automatic star Dreiejk circuit.

This circuit consists of a new contactor, star contactor. Triangular contactor and a time relay.

The known circuits are too material-consuming and require a lot of space. Wiring this circuit also takes a lot of Zeil.

The existing in the patent literature writings DD 135551, DE 2363409 combine the delta contactor and the star contactor to a contactor. By this solution, a slight space saving is achieved, but the disadvantages mentioned are not eliminated.

Object of the invention

I iel the invention is to provide a switching device for a star-delta contactor, which reduces the cost of material, space and the time to build the circuit.

Explanation of the essence of the invention

According to the invention the object is to provide a Schaltvoi direction for a star-delta contactor, which reduces the Aurwand of material, space and time by the fact that a contactor with three levels of contact is constructed, Netzschüt-, star contactor, Triangle contactor and time relay in an assembly are integrated.

At rest, the plane, mesh and triangle are open and star closed. In the case of sliver operation, the mains contact pairs close, in delta operation the star contact pairs close and the triangle contact pairs close. The mains contact pairs are closed in their position. Temporal switching is determined by a bimetal, which is a mechanical »! Unlocks the lock and forces the contactor from star to delta operation when the network level contacts are closed.

embodiment

The invention will be explained below with reference to a Ausführungslieispiel. In the drawings show

Fig. 1: Principle representation of the contactor in O-Stellunn

Fig. 2: Schematic representation of the contactor in star position

Fig. 3: Schematic representation of the contactor in the triangle position

Fig.4: internal circuit for direct switching

Fig. 5: Control of the contactor

Fig.6: Main power supply for currentless switching

Fig.7: internal circuit for currentless switching

Fig. 1-3: are executed in unipolar representation.

Fig. 1 zoigt the O position in which the power contact pair in the triangle contact pair opened and closed the star contact pair

Fiji. 2 shows the star circuit in which the mains contact pair and the star contact pair are closed.

To achieve this circuit, a force must be exerted on the plunger 1. This force is generated by the magnetic field of the contactor coil. The direction of movement is shown by arrow 2. The opening of the star contact pairs is prevented by the lock 5. At the same time the spring 4 is biased. If the F '"netall has buckled 3, the lock 5 is released and the sleeve 6 by the prestressed spring 4 in the printing direction 2 ack / Vegt, woht> i H ₂₂ Konidkipaar star opened and diis contact pair triangle is closed. The achieved Dreiecksrheij-jny shows Fig.3.

When the magnetic field of the contactor coil drops, the pairs of contacts spring back into their initial position through the spring 7 and the driver 8 in FIG. 1, and springs 9 never serve to reliably make contact between the movable and stationary contacts.

Fig. 4 shows the internal! Contactor circuit for direct switching from star operation to triangular operation with closed network contacts.

If a voltage is present at the connection points A1 and A2, the contactor coil Q1 picks up and closes the self-holding contact. At the same time, the bimetal B, whose heating time can be adjusted with the resistor R, heats up. By heating the bimetal via a heating coil, it bends and triggers a mechanical switching process, interrupting its heating circuit via its own opener. A subsequent connection is only possible.

when the bimetal has cooled down to prevent the motor starting in a triangle.

Fig. 5 shows the control of the star-delta contactor, which may be a normal Solbsthalteschaltung.

Fig. 6 and 7 show the currentless switching with l.ichtbogenschutz. When a voltage is applied to A1 and A2 in Fig. 7, Q1 attracts via the bimetallic contact in the current path 1 and switches the auxiliary relay K1 through the contact Q1 in the current path 2. K1 holds itself. This closes the auxiliary circuit for the bimetal. In the main circuit, the mains contact pairs and the pairs of circuits are closed. The leading bimetal contact in current path 1 switches off Q1 after the heating time has been reached, thus opening the mains contact pairs in the main circuit.

The lagging bimetallic contact in the current path 2 switches over and thus interrupts the heating circuit. When the arc at the mains contact pairs has extinguished, auxiliary relay K2 drops in FIG. 6 and switches Q1 in FIG. Since the mechanical lock was unlocked when the Heizstromkieises interrupted, the contactor switches to delta operation.

A repeated connection is also possible here only with cooled bimetal, which is achieved by the Hilfsrelaic K1.

Fig. 7 is up to contact KI! in rung 2 to the internal circuit to meet the set goal. The arc protection is required for motors with a power of 10KW or more.

Claims (3)

1. switching device for a star-delta contactor, characterized in that the star-delta contactor is equipped with three Schaltebonon such that the main contact pairs net, star and triangle are combined to form a contactor, wherein the circuit, which after the set trip time the contactor in the operational delta operation also switches internally with the module is combined. 2. switching device for a star-delta contactor according to item 1, characterized in that the time relay, which determines the Umschalivorgänge, is integrated in the contactor with. 3. Switching device for a star-delta contactor according to item 1 and?. <·! & Uroh marked that only one SDiile is needed.