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A Resistive DC Superconducting Current Limiter

A superconducting current limiter, resistance type technology, applied in the usage of superconductor elements, electrical components, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., can solve the problem of low resistivity, high cost, weakening resistance, etc. The application advantages of the type current limiter and other issues, to achieve the effect of increasing resistance, fast current limiting speed, and increasing critical current

Inactive Publication Date: 2019-01-15
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the resistivity of superconducting strips after quenching is relatively low. As the number increases, the resistance per unit length is further reduced, so a large amount of superconducting materials are required, resulting in high cost and weakening the application advantages of resistive current limiters in DC power grids

Method used

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  • A Resistive DC Superconducting Current Limiter
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  • A Resistive DC Superconducting Current Limiter

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Experimental program
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Embodiment 1

[0016] The invention proposes a resistance type DC superconducting current limiter, which includes two parts: a superconducting coil and an iron yoke. Based on the anisotropy of the critical current of the superconducting material, by installing iron yokes on the upper and lower parts of the superconducting coil of the current limiter, the critical current of the current limiter can be increased, and the amount of superconducting material can be effectively reduced, which can be used as a DC microgrid , DC power distribution, DC transmission, and ship power system fault current limiting device, with the advantages of fast current limiting speed, high current density, high mechanical strength, and high utilization efficiency of superconducting materials. The specific plan is as follows:

[0017] The superconducting coil is the main body of the DC superconducting current limiter. When the current limiter flows through the current, according to Ampere's law, the superconducting c...

Embodiment 2

[0021] The purpose of the present invention is to provide a resistance-type current limiter to meet the engineering requirements of the superconducting current limiter when limiting fault current in the fields of ship power system, DC micro-grid, DC power distribution, and DC transmission, etc., as described in the background technology. DC superconducting current limiter, the technical solution is:

[0022] The resistive DC superconducting current limiter consists of a superconducting coil (3), an upper iron yoke (1) and a lower iron yoke (2), such as figure 2 As shown, the superconducting coil (3) is the main body of the current limiter, and the function of the upper iron yoke (1) and the lower iron yoke (2) is to reduce the magnetic field component perpendicular to the surface of the superconducting strip.

[0023] The superconducting coil (3) is formed by closely arranging superconducting strands (9) on the cylinder wall and winding them layer by layer. The superconducti...

Embodiment 3

[0033] Attached below image 3 The present invention is further described.

[0034] Current limiter current limiting resistance R = 10Ω, current limiter critical current Ic = 1400A, strip resistance per unit length after quenching R0 = 70Ω / km, strip critical current Ic0 = 500A, superconducting strand resistance per unit length RR = 9.61Ω / km, the number of strips in the superconducting strands is n=7, and the number of layers of superconducting coils is c=2. Geometric parameters such as image 3 , as shown in the sectional view of the resistive DC superconducting current limiter: superconducting coil section (7) inner diameter a1=0.45m, outer diameter a2=0.4550m, coil height 2b=2.22m; superconducting strand section (9) wide kk=0.0122m, thickness hh=0.0025m; iron yoke section (6), (8) inner diameter r1=0.001m, outer diameter r2=0.5m, thickness h=0.1m; gap between iron yoke and coil s= 0.002m. The design size of the iron yoke should meet the condition: during operation, the i...

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Abstract

The present invention belongs to the field of superconducting electric technologies, and particularly relates to a resistance type DC superconducting current limiter. The current limiter comprises a superconducting coil and iron yokes. The superconducting coil forms a body of the current limiter. The iron yokes comprise an upper iron yoke and a lower iron yoke. The upper iron yoke and the lower iron yoke are used for lowering magnetic field component perpendicular to a surface of a superconducting strip material. The current limiter can effectively suppress fault current of DC, can meet the current density demand of large engineering, and has advantages of high use ratio of the superconducting material, reduction of manufacture cost and so on.

Description

technical field [0001] The invention belongs to the technical field of superconducting power, in particular to a resistance type DC superconducting current limiter. Background technique [0002] After a DC power grid fault occurs, serious overcurrent phenomena will occur on the DC side, AC side, and converter devices. In order to ensure the safe and reliable operation of the system, the DC fault current must be cut off quickly. Superconducting current limiter is an effective measure to limit fault current. It can be divided into resistive type and inductive type according to the impedance properties of current-passing / current-limiting components. In DC grids, resistive current limiters are superior to inductive current limiters. First of all, the resistive current limiter will not weaken the current limiting effect because the fault current is DC, while the inductive current limiter is more suitable for limiting the fault current of the AC grid. Secondly, after the resisti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/02
CPCH02H9/023Y02E40/60
Inventor 姜喆王银顺皮伟张瀚阚常涛付瑜
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)