Analysis of the Causes of Excessive Power Consumption of High Voltage Motors

The high voltage motor is generated because the motor power is positively related to the doubling of the voltage and current, so the power of the low voltage motor increases to a certain level
1. Low load rate of high voltage motor
Due to the unreasonable selection of the motor and the change of the production process, the load of the motor in the specific work is much lower than the rated load, and the motor which accounts for about 30%-40% of the annual power generation, the operating efficiency is too high at 30%-50% of the rated load. Low, the cause of high-voltage motors The motor power is positively related to the multiplication of voltage and current, so the power of low-voltage motors is at a certain level (for example, high-power output must be completed according to the increase in voltage. Maintenance of high-voltage motors.
2. The switching power supply voltage is different or the voltage is too low
Due to the imbalance of the single-phase electrical load of the three-phase four-wire power supply and distribution system, the three-phase voltage of the motor is different, and the high-voltage motor generates negative sequence torque. The three-phase voltage of the larger motor is different, and the motor generates negative sequence during operation. Torque increases losses in engine operation. In addition, the long-term voltage of the grid is slightly lower, which promotes the large current of the Sigma motor during normal operation, so the loss is larger; the greater the non-parallelism of the three-phase voltage, the lower the voltage and the greater the loss.
3. The replacement of the high-voltage motor is still in use
This high-voltage motor adopts E-class insulation, which is large in size, poor in operating characteristics and low in efficiency. Although it has been updated and remodeled over the years, it is still in use in many areas.
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