The rated voltage of the three-phase asynchronous motor is 380 V. According to the regulations and requirements of the working conditions of the asynchronous motor, the terminal voltage at the motor outlet shall not be higher than 10% of the rated voltage, that is, 380 *1.1= 418V.

Your 430 volts is on the high side. In order to illustrate the influence of high voltage on the motor, I will give you a set of test data:

When the rated voltage exceeds 10%:

1, and the maximum starting torque is increased by 21%;

2. The slip rate is reduced17%;

3, the power factor is reduced by 3-6%;

4. The starting current is increased by 10- 12%.

It can be seen that long-term operation will greatly reduce the life of the motor! By the way, doesn't your company have its own transformer? Judging from the current situation, the voltage is very high no matter day or night. You can adjust the gear of the transformer. What gear is it now? Because you have to adjust the voltage without excitation, the fifth and third gears in centimeters are basic gears, and the voltage will be adjusted by 2.5% for each gear. Now, if you shift to the third gear, the voltage will be reduced by 5%, so the voltage during the day is 4 12*( 1-5%)=390V, and at night it is 430 * (630).