Fengwen Yang

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If a no-load transformer is switch on or switch off, or in the period of voltage recovery when suffered from an external fault, a big excitation inrush current will appear in transformer windings, this may lead to the damage of the device, and bring impact to power grid, sometimes it will make the differential protection of the transformer misoperation.(More)
Nowadays, as the development of economy and technology, more and more electric devices need a DC voltage power source to supply a constant current. The Magnetic controllable transformer is also use a DC control module to provide a stable and reliable DC current. By a TMS320F2812 DSP chip as controller, this paper presents a design of DC constant current(More)
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