Several principles on how much energy a frequency converter can save or how high the power saving rate is

Several principles for energy saving or power saving rate

1) There are certain conditions for frequency converter to save power. Under the condition that it does not affect the use, after changing the working parameters appropriately, the power consumed by unreasonable operating parameters can be saved, and the general operation can be changed to economic operation.

2) To save energy, the frequency must be reduced. The greater the reduction value, the more power can be saved. If the frequency is not reduced, the frequency converter cannot save power in principle.

3) It is related to the load rate of the motor. When the load rate is 10% to 90%, the power saving rate is about 8% to 10% at most. The corresponding power saving rate is higher when the load rate is low. However, the reactive power saving rate is about 40% to 50%, which does not include electricity charges.

4) It is related to the rationality of the original operating parameters. For example, it is related to the adjustable values ​​of pressure, flow, speed, etc. The larger the adjustable value, the higher the power saving rate, otherwise the opposite.

5) It is related to the original adjustment method. It is very uneconomical to adjust the operating parameters by using the inlet or outlet valve method. If it is changed to frequency converter speed regulation, it is economical and reasonable. After using the frequency converter to adjust the speed, it can save 20% to 30% more electricity than the manual valve adjustment operation method.

6) It is related to the original speed regulation method. For example, the original slip motor speed regulation was very uneconomical due to its low speed regulation efficiency, especially at medium and low speeds, the efficiency was only less than 50%. After changing to the frequency converter speed regulation, this part of the electricity can be saved. At present, most of the light industry, textile, papermaking, printing and dyeing, plastic, rubber and other industries are still using slip motors, so the use of frequency converters to achieve energy saving is an urgent matter of technical transformation.

7) It is related to the working mode of the motor. For example, the power saving of continuous operation, short-term operation and intermittent operation is different.

8) It is related to the length of time the motor is turned on. For example, if the machine is turned on for 24 hours a day and 365 days a year, the power saving is large, and vice versa.

9) It is related to the power of the motor itself. Under the same power saving rate, the power saving value of a large power is large, and the economic benefit is large. Even if the power saving rate is lower than that of a small power motor, the actual benefit is large.

10) It is related to the importance of the production process equipment of the unit. First of all, we should select the equipment with high power consumption, high product cost, and the current speed regulation method is not economical and reasonable, and transform it. After using the inverter, we can get an immediate effect and get twice the result with half the effort.

When choosing the inverter for speed regulation or energy saving, we should abide by the above 10 principles as the premise of deciding the plan. If the local electricity price is high, the economic benefits will be greater when the same amount of electricity is saved, which is also something that must be considered.