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Starting mode of the starter
Starting mode of three-phase asynchronous motor
1, direct start. However, when the three-phase asynchronous motor starts directly, the current can reach 6-7 times the rated current, which has a large impact on the power grid, especially the high-power motor.
2, reduced voltage start. The buck start mainly includes hot autoroot buck start and star triangle buck start.
Hot autobuck starting means that the motor voltage is reduced and the starting current is reduced at the same time when the autotransformer is started. It is generally reduced to about 55%-75% of the rated voltage. The advantage is that the starting voltage can be easily changed by changing the number of taps of the autotransformer. The disadvantage is the need to use the autotransformer, the cost is larger.
Star triangle step-down starting refers to a method of changing the starting voltage by changing the connection mode of the motor, so as to reduce the starting current, which can only be applied to the normal connection mode of the triangle connection of the motor. When starting, the relay method is used to make the motor wiring mode star-shaped, at this time, the voltage of each phase of the motor is reduced to one-third of the original root sign, the motor speed reaches about 80% of the rated speed, and the control relay changes the motor wiring mode to triangle, and the motor starts to operate normally. The advantage is that it can save the autotransformer, reduce the cost, and the wiring method is simple and the reliability is greater. The disadvantage is that the ratio of starting voltage cannot be changed, and the motor cannot be used in the star connection.
3, frequency resistor start. Frequency sensitive resistance starting means that the frequency sensitive resistance is connected in series in the main circuit when the motor is started, thereby reducing the starting current. Frequency sensitive resistor can change the starting current smoothly and has less impact on the power grid, so it is an ideal starting mode. However, high-power frequency-sensitive resistors are in the form of inductors, so they will produce a large electromagnetic eddy current in use, which will reduce the power factor of the grid.