Internal bypass type soft starter

Abstract

The invention discloses an internal bypass type soft starter. The internal bypass type soft starter comprises a power source, a soft starter and a motor, wherein the power source is connected with the soft starter, the soft starter is connected with the motor, the soft starter comprises a main loop, a current transformer and a circuit board, the current transformer is arranged on the main loop and connected with the circuit board, the circuit board is connected with a silicon controlled module in the main loop in drive mode, the main loop is formed by connecting the internal bypass contactor with the silicon controlled module in parallel, the silicon controlled module comprises a first silicon controlled rectifier and a second silicon controlled rectifier, and the first silicon controlled rectifier and the second silicon controlled rectifier are connected in parallel. By adopting the technical scheme, the internal bypass type soft starter is convenient to use, and can not cause arc discharge. The internal bypass contactor is integrated into the internal bypass type soft starter, and therefore the number of components is decreased, the size of the internal bypass type soft starter is reduced, and the internal bypass type soft starter is convenient and practical, and greatly reduces costs. The internal bypass type soft starter guarantees complete achievement of electronic arc extinction by using the silicon controlled module, the circuit board and the internal bypass contactor cooperatively. The internal bypass type soft starter is safe and reliable in overall work, and can stably run for a long time.

Description

technical field [0001] The invention relates to the field of soft starters, in particular to a built-in bypass type soft starter. Background technique [0002] In the 1980s, soft starters became ideal products for motor starting control, filling the gap between star-delta starters and frequency converters in terms of functionality and price. Its working process is to use thyristor to start and contactor to bypass work. When starting, the motor voltage can be effectively controlled so that it increases gradually during the starting process, and the starting current is naturally controlled to minimize mechanical and electrical stress. Therefore, soft starters are widely used in the market. However, bypass contactors often need to be configured separately, and breaking under the condition of high voltage and high current will cause arcing. [0003] Arc is a gas discharge phenomenon, the instantaneous spark generated by the current passing through some insulating medium (such...

AI Technical Summary

Problems solved by technology

Moreover, this kind of external bypass soft starter requires the user to configure a bypass contactor of a certain specification and the necessary peripheral boxes and circuits to work normally, which is very inconvenient and increases the user's cost. When it is low, it will often be damaged and affect normal production operations

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