Improved Star-Delta Starter with Current Limiting Reactor

Abstract

The invention relates to a star delta starter and discloses an improved type star delta starter with current-limiting reactors. The improved type star delta starter comprises a three-phase four-wire wiring terminal L1, a three-phase four-wire wiring terminal L2, a three-phase four-wire wiring terminal L3, a three-phase four-wire wiring terminal N, a motor M armature wiring terminal U1, a motor M armature wiring terminal V1, a motor M armature wiring terminal W1, a motor M armature wiring terminal U2, a motor M armature wiring terminal V2, a motor M armature wiring terminal W2, an alternating-current contactor K1, an alternating-current contactor K2, an alternating-current contactor K3 and an alternating-current contactor K4, and further comprises the current-limiting reactor TR1; and the current-limiting reactor TR1 is in bridge joint between the whole of the motor M armature wiring terminal U1, the motor M armature wiring terminal V1 and the motor M armature wiring terminal W1, and the whole of the motor M armature wiring terminal U2, the motor M armature wiring terminal V2 and the motor M armature wiring terminal W2. According to the improved type star delta starter disclosed by the invention, the current-limiting reactor TR1 is in bridge joint between the whole of the motor M armature wiring terminal U1, the motor M armature wiring terminal V1 and the motor M armature wiring terminal W1, and the whole of the motor M armature wiring terminal U2, the motor M armature wiring terminal V2 and the motor M armature wiring terminal W2, so that the current-limiting reactor TR1 can reduce impact current in a transient conversion process from star starting to delta operation, and stable starting of closed type switching is realized; and the structure is high in reliability, the operation is convenient, the whole structure is simple, and the safety is high.

Description

technical field [0001] The invention relates to a star-delta starter, in particular to an improved star-delta starter with a current-limiting reactor. Background technique [0002] Asynchronous motors are widely used because of their simple structure, low price, and high reliability. However, the starting current is relatively large during the starting process, so the motor with large capacity must be started in a certain way. Star-delta starting is a simple and convenient way to reduce Press start mode. When the star-delta starting method is adopted, the current characteristic is very good, but the torque characteristic is poor, so objectively, it is only suitable for no-load or light-load starting occasions. In other words, due to the small starting torque, the advantages of star-delta starting are still very significant, because the star-delta starter based on this starting principle has the simplest structure and the cheapest price compared with any other decompression ...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the shortcoming of the inrush current caused by switching from star to triangle in the prior art, which easily leads to start-up failure, and provides an improvement of a reactor with current limiting that can greatly reduce the switching inrush current and realize smooth closed switching Type star delta starter

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