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Low/medium voltage and high voltage motor soft starter composed by three-phase commutation bridge

A soft starter, high-voltage motor technology, used in motor generator/starter, single multi-phase induction motor starter, motor starter and other directions, can solve problems such as capacity expansion limit, achieve commutation safety, dead zone "The effect of short time and low harmonic content

Inactive Publication Date: 2009-04-08
刘群 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the AC voltage regulation still uses the thyristor anti-parallel circuit, the expansion is still limited by the "multi-parallel multi-series" of thyristors and the inherent shortcomings of the anti-parallel circuit.

Method used

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  • Low/medium voltage and high voltage motor soft starter composed by three-phase commutation bridge
  • Low/medium voltage and high voltage motor soft starter composed by three-phase commutation bridge
  • Low/medium voltage and high voltage motor soft starter composed by three-phase commutation bridge

Examples

Experimental program
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Effect test

Embodiment Construction

[0076] Since the "thyristor three-phase fully-controlled rectifier bridge with DC side short-circuit operation" AC voltage regulator and its phase-shifting control software are common parts of the soft starter products for medium and high voltage motors in this invention, the AC voltage regulation unit should be Listed as the basic components of this product development for implementation. The "voltage regulation unit" referred to in the present invention refers to a Hall current sensor that includes six SCR elements, a bridge circuit, a trigger, a resistance-capacity absorption circuit, and a Hall current sensor installed on a short-circuit line on the DC side (the short-circuit line passes through the sensor to detect Hole), three AC busbars, two DC busbars, control circuit leads, switching power supply and phase-shift control system, etc., they are assembled in a closed box with air-cooled or water-cooled channels (hereinafter referred to as "black box"). Touch switch / accid...

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Abstract

The invention discloses a soft starter for mesolow and high voltage motors, which consists of three phase bridges. The invention relates to starting control without impact of middle, low and high voltage alternating current motors. The soft starter takes a thyristor three-phase full-control rectifier bridge which works based on short circuit at the direct current side as an AC voltage regulator, the stator winding of a motor is connected in the AC loop of the rectifier bridge, and the mesolow (220-380-660V) motor can achieve 'one drives N' soft starting by phase control; the low-voltage coil of an isolation transformer is connected in the AC loop of the rectifier bridge, the stator of the motor is connected with the high-voltage coil in series, and the high voltage (3-6-10KV) motor can achieve 'one drive N' soft starting by phase control. A plurality of groups of low-voltage coils are arranged and a plurality of sets of rectifier bridges are adopted, thus forming a high voltage 'multiplex' soft starter, so that the problem that the high-power mechanical and electrical transmission system can be started under control.

Description

(1) Technical field [0001] The invention relates to a controllable starting device using a thyristor three-phase fully-controlled rectifier bridge as an AC voltage regulator, which is used to control and drive an AC motor to achieve a smooth and soft start, thereby reducing current impact, reducing mechanical transmission stress, and extending Electromechanical Equipment Life and Suppression Impacts on the Grid. (2) Background technology [0002] AC squirrel-cage induction motors are simple in structure, sturdy and durable, high in power conversion efficiency, convenient in maintenance, and widely used in a wide range of applications. The additional loss also affects the normal operation of other power users. Since the advent of the thyristor (SCR) solid-state soft starter in the 1980s, it has satisfactorily solved the starting problem of the AC motor. However, since the existing solid-state soft starter products (both at home and abroad) all use thyristor (SCR) three-phas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P1/28H02P1/54H02P1/32
Inventor 刘群
Owner 刘群
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