UPS instantly switching Y-△ starting circuit

Published:2011/7/10 20:20:00 Author:John | Keyword: KM4, Y-△ starting | From:SeekIC

As for conventional Y-△ starting motors, when the motor shifts from a Y-shaped to △ running, phase short circuit often occur. In order to prevent phase short circuit, motor winding generator usually occur with power outages, thus inevitably for the formation of a strong secondary impact of current for the grid and the motor itself. The circuit is shown, which can achieve the uninterruptible power supply during the operation of shifting from Y-shaped to △ running. Besides, the voltage of the motor winding is not the line voltage which is directly from the Y-phase voltage to start operation of the △-shape. Actually, it has gone through a transition to an intermediate voltage level.



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