If your home's motor is used less than others, have you ever thought about why? Today, Sinol tells you that it may be that your home's motor needs a soft starter. Generally, the motor should use the motor soft starter when the power is more than 30KW. Otherwise, it will seriously affect the operation and operation of other equipment in the power grid. Its own damage. Sinol tells you why you should use a motor soft starter. What good is it?
The hazard of direct full-voltage starting of the motor and the benefits of the motor soft start cabinet
1. Cause grid voltage fluctuations, affecting the operation of other equipment in the grid
When the AC motor is directly started at full voltage, the starting current will reach 4~7 times of the rated current. When the capacity of the motor is relatively large, the starting current will cause a sharp drop in the grid voltage, which will affect the normal operation of other equipment in the grid.
When the motor uses a soft start cabinet, the starting current is generally 2~3 times of the rated current, and the grid voltage fluctuation rate is generally within 10%, which has little impact on other equipment.
2. Impact on the grid
The impact on the grid is mainly reflected in two aspects:
The impact of a large current directly driven by a super large motor on the power grid is almost similar to the impact of a three-phase short circuit on the power grid, which often causes power oscillations and makes the power grid unstable.
2 The starting current contains a large number of high-order harmonics, which will cause high-frequency resonance with the grid circuit parameters, causing malfunctions such as relay protection malfunction and automatic control failure.
When the motor starts with a soft starter, the starting current is greatly reduced, and the above effects can be completely eliminated.
3. Damage motor insulation and reduce motor life
The Joule heat generated by a large current repeatedly acts on the outer insulation of the wire to accelerate the aging of the insulation and reduce the life.
The mechanical force generated by the 2 large currents causes the wires to rub against each other and reduces the insulation life.
3 When the high-voltage switch is closed, the jitter of the contact will generate an operating over-voltage on the stator winding of the motor, sometimes reaching more than 5 times the applied voltage. Such a high over-voltage will cause great damage to the motor insulation.
When the motor uses a soft starter cabinet, the large current of Zui is reduced by about half. The instantaneous heat generation is only about 1/4 of the straight-up, and the insulation life will be greatly extended. When the soft start, the motor terminal voltage can be adjusted from zero, and the over-voltage injury can be completely eliminated. .
4. Electric power damage to the motor
The large current generates a large impact force on the stator coil of the motor and the squirrel cage of the rotor, which may cause failures such as loose clamping, deformation of the coil, and breakage of the squirrel cage.
When the motor uses a soft starter cabinet, the impact force is greatly reduced due to the small current of the Zui.
5. Damage to mechanical equipment
The starting torque at full pressure direct start is about twice the rated torque. Such a large moment is suddenly added to the stationary mechanical equipment, which will accelerate gear wear and even toothing, accelerate belt wear and even break the belt and accelerate the blade. Fatigue or even breaking the blades and so on.
The torque of the motor starting with the soft starter cabinet will not exceed the rated torque, and the above drawbacks can be completely overcome.
Sinol focuses on the power electronics industry for 13 years, has a wealth of industry experience, factory direct sales, low prices, mainly high and low voltage soft starters, inverters and so on.
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