INDUCTION MOTOR STARTING USING SOFT STARTER
Author(s):
AKHIL T S
Keywords:
Di/dt, Silicon Controlled rectifier (SCR), soft starter, switching transients
Abstract
An induction motor has the ability to self start but its starting create many issues to motor as well as power system. The characteristics and performance of induction motor can be changed. This is mainly because of high starting current than rated current. Mechanical and thermal stress can be occur in the motor and load due to high starting current. Many different starters such as Star-Delta Starter, Auto-Transformer Starter, DOL Starters are use for safe starting of induction motor. But these methods cannot rectify the starting problem of induction motor. A soft starter is a new device and is used for smooth starting of induction motor. Soft starter reduces the starting current and torque of the induction motor. Soft starters are particularly used for medium voltage motors. Soft starter uses solid state devices like thyristors to control the supply voltage. Transients during ON and OFF processes of switching are a major concern for the SCR. During transient , the current rise rate di/dt can pass through the thyristor can damage them. The aim of this paper is focused on protection of induction motor during starting, and limiting di/dt to safe level by adding an inductor in to the soft starter circuit.
Article Details
Unique Paper ID: 147252

Publication Volume & Issue: Volume 5, Issue 6

Page(s): 153 - 157
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