The advantages and disadvantages of high-voltage motors compared with low-voltage motors

(1) advantages

① can do a lot of power, the maximum can reach thousands or even tens of thousands of kilowatts. This is because, at the same output power, the high-voltage motor current can be much smaller than the low-voltage motor (basically inversely proportional to the voltage), for example 500kW, the rated current of a 4-pole motor, about 900A when the rated voltage is 380V, The rated voltage of 10kV only about 30A. Therefore, high-voltage motor windings available smaller diameter. As a result, stator copper losses in high-voltage motors are also lower than in low-voltage motors. For higher power motors, the use of low-voltage, due to the need for thicker wires and the need for a large area of stator slots, the stator core diameter is very large, the entire volume of the motor will be great.

② For larger capacity motors, high-voltage motors used in power supply and distribution equipment than the low-voltage motor overall investment less, and the line loss is small, can save some power consumption. Especially the 10kV high-voltage motor can directly use the network power (China's high-voltage power supply to the user are generally 10kV), so that the power equipment (mainly transformers) will be less investment, the use is relatively simple, the failure rate Will be less.

(2) Disadvantages

The cost of the windings is relatively high (mainly caused by the insulation) and the associated insulation material costs are also higher.

② insulation process more difficult, more time and labor costs.

The requirements of the use of the environment than the low-voltage motor to be strictly a lot.