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Energy Saving Theory and Effects of Inverter
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Energy Saving Theory and Effects of Inverter

Views:137     Author:Eric     Publish Time: 2021-08-27      Origin:Site

From the fluid mechanics P(power) = Q(flow) ╳ H(pressure), it can be deduced that the power consumption of the pump motor and the rotational speed is approximated by the relationship of cubed ratio. For example a pump motor power is 55KW:

When the speed drops to 4/5 of the original speed, its power consumption is 28.16KW, saving 48.8%. (4/5)3*100%*55kw=28.16kw

When the speed drops to 1/2 of the original speed, its power consumption is 6.875KW, saving 87.5%. (1/2)3*100%*55kw=6.875kw

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As the motor is started directly or Y/D, the starting current is equal to (4-7) times the rated current. That will cause a serious impact on the electromechanical equipment and power supply grid. And will also require too much power grid capacity. The large current and vibration generated during the start-up will cause great damage to the baffle and valve. That will also be extremely unfavorable to the service life of the equipment and pipeline. 

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After using the frequency conversion energy-saving device. The soft-start function of the frequency converter will make the starting current start from zero, and the maximum value will not exceed the rated current. Which will reduce the impact on the power grid and the requirement of power supply capacity. And prolong the service life of the equipment and valves. It saves the maintenance cost of the equipment.

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