China's motor power consumption accounts for 60% to 70% of the national power generation, fan, pump equipment annual electricity consumption accounts for 1/3 of the national electricity consumption. The main reasons for this situation are as follows: The traditional speed regulation method of fans, pumps and other equipment is to adjust the air supply and water supply by adjusting the baffle and valve opening of the inlet or outlet, and the output power consumes a large amount of energy in the baffle , The valve closure process. Because the fans and pumps mostly are square torque loads, the relationship between shaft power and speed is square, so when the fan and pump speed drop, the power consumption is also greatly reduced, so the energy saving potential is very large. The most effective energy saving measure is to use frequency conversion Governor to regulate the flow, air volume, frequency converter energy saving rate of 20% to 50%, and usually in the design, the user pump motor design capacity is much higher than the actual need, there is the phenomenon of "big car" , Inefficient, resulting in a lot of waste of electricity. Therefore, the promotion of exchange frequency control device is significant.

Driven by a drive with a high energy-saving space. At present, many countries have designated the flow pressure control must use the frequency control device to replace the traditional way, China's State Energy Law Article 29, paragraph 2 also clearly stipulates that the fan pump load should adopt power electronic speed control.

Energy-saving principle of energy-saving inverter

1, energy-saving inverter

From the fluid mechanics we can see, P (power) = Q (flow)? H (pressure), the flow Q and speed N is proportional to the first power, pressure H and the square of the rotational speed N is proportional to the power P and the rotational speed of the cube is proportional to N , If the efficiency of the pump is constant, when the demand for adjusting the flow rate decreases, the rotational speed N can be decreased proportionally, while the axial output power P has a cubic relationship decreasing. That is, the power consumption of the pump motor and the rotational speed of the approximate square ratio relationship. For example: a pump motor power 55KW, when the speed dropped to 4/5 of the original speed, the power consumption of 28.16KW, saving 48.8%, when the speed dropped to the original speed of 1/2, the power consumption The amount is 6.875KW, saving 87.5%.

2, power factor compensation energy saving

Reactive power not only increases the line loss and the heating of the equipment, but more importantly, the reduction of the power factor leads to the reduction of the active power of the power grid. A large amount of reactive energy is consumed in the circuit, and the use efficiency of the equipment is low and the waste is serious. The formula P = S COS,, S = SIN, SIN,, where S-apparent power, P-active power, Q-reactive power, and COS--power factor. It can be seen that the larger the COS Φ and the larger the active power P, the ordinary pump motor has a power factor of 0.6-0.7, the use of frequency control device, due to the role of inverter internal filter capacitor, COSФ ≈ 1, thus reducing the reactive power loss and increase the active power grid.

3, soft start energy saving

Since the motor is started directly or Y / D is on, the starting current is equal to (4-7) times the rated current, which can have a serious impact on the electromechanical equipment and the supply network, but also on the grid capacity too much, Large current and vibration damage to the baffle and valve great, the equipment, the life of the pipeline is extremely unfavorable. The use of inverter energy-saving device, the use of inverter soft-start function will start the current from zero, the maximum does not exceed the rated current, reducing the impact on the power grid and the power supply requirements, extending the use of equipment and valves life. Save the equipment maintenance costs.

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