DC de-icing device without special rectifier transformer and protection method thereof

The invention relates to a DC de-icing device without a special rectifier transformer and a protection method thereof. The DC de-icing device without the special rectifier transformer comprises a AC-side power supply circuit breaker QF, an isolator K, valve-side current mutual inductors Iva, Ivb and Ivc, a current converter, DC-side voltage mutual inductors Udp and Udn, DC-side current mutual inductors Idp and Idn and DC-side disconnecting links S1, S2, S3 and S4. The DC de-icing device has reasonable design, less investment and low cost. The protection method of the DC de-icing device without the special rectifier transformer can ensure that the DC de-icing device satisfy the safe and rapid de-icing requirements of different roads and can reduce the investment of the DC de-icing device. The DC de-icing device has ingenuous design, excellent performance, low investment, complete protection functions, convenience and practicability.