DC superconducting fault current limiter

Abstract

The invention supplies a DC superconduction fault current limiter, whose structure is: two superconduction coupling coil w1 and w2, has the same inductance wrapped on ring shaped core and one superconduction coil w1 is current limiting inductor whose two ends are connected to load loop, and another superconduction coil w2 as bias winding is connected to DC power source E2 and resistor R2 in series, w1 and w2 cooled by cooling device current limiting effect. The invention has advantages is: notable current limiting effect and low loss; short response time and high reliability, when the system operates normally, superconduction coil has very small stored energy and won't create overvoltage after accident protection; detecting, triggering and current limiting are integrated without need of adding control circuit, simple structure and small volume. The invention can satisfy DC fault protective device of individual system such as ship, plane, oil platform, mobile communication station and electric automobile.

Description

technical field [0001] The invention is a DC power system fault protection device. Background technique [0002] In order to limit the short-circuit current, the usual method is to install a DC circuit breaker. When the system fails, the circuit breaker cuts off the short-circuit current to achieve the purpose of fault protection. At present, the DC circuit breaker mainly includes a conversion circuit and an AC circuit breaker. After a fault short circuit, an artificial current zero point is generated through the conversion circuit, and then the AC circuit breaker is used to break the short-circuit current. Since the conversion circuit of the circuit breaker needs to detect the short-circuit signal and then act, the reaction time of the circuit breaker is relatively long, which is not conducive to the rapid protection of the power system; because the energy stored in the circuit breaker is large during normal operation, so in the fault protection , an overvoltage occurs. ...

AI Technical Summary

Problems solved by technology

Since the conversion circuit of the circuit breaker needs to detect the short-circuit signal and then act, the reaction time of the circuit breaker is relatively long, which is not conducive to the rapid protection of the power system; because the energy stored in the circuit breaker is large during normal operation, so in the fault protection When the overvoltage occurs

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