DC superconducting fault current limiter

A fault current limiter and superconducting technology, applied in protection switch operation/release mechanisms, electrical components, emergency protection circuit devices, etc., can solve problems such as long response time of circuit breakers, unfavorable power system rapid protection, overvoltage, etc. Achieve the effect of simple structure, high reliability and short response time

Inactive Publication Date: 2005-03-16
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 conduc

Method used

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  • DC superconducting fault current limiter
  • DC superconducting fault current limiter
  • DC superconducting fault current limiter

Examples

Experimental program
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Effect test

Embodiment Construction

[0017] Depend on figure 1 , figure 2 As shown, the DC power supply of the load circuit is E 1 , the load resistance is R 1 , on the toroidal core 1, two superconducting coupling coils W with equal inductance are wound 1 , W 2 , one of the superconducting coils W 1 As a current-limiting coil, both ends are connected to the load circuit, and the other superconducting coil W 2 As a bias coil, with a DC power supply E 2 and resistor R 2 Phase series, superconducting coupled coil W 1 , W 2 Cool with a cooling device.

[0018] Coupling coil W 1 , W 2 It can be wound with superconducting materials (such as low-temperature superconductor NbTi, high-temperature superconductor Bi2223 / Ag, etc.). The cooling device can be cooled by a cryogenic container filled with a coolant, and the coolant and cooling temperature are determined according to the superconducting material used.

[0019] Such as image 3 as shown, image 3 It is an existing cooling device, wherein: 2 is the ...

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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. ...

Claims

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Application Information

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IPC IPC(8): H01H71/10H02H3/087
Inventor 唐跃进王晨
Owner HUAZHONG UNIV OF SCI & TECH
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