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Method for protecting superconductive cable

A technology for superconducting cables and three-phase cables, applied in emergency protection circuit devices, emergency protection devices for automatic disconnection, electrical components, etc. Sudden quenching of cables and other problems to achieve the effect of ensuring safety, improving power supply reliability, and strong practicability

Inactive Publication Date: 2008-08-27
北京云电英纳超导电力技术有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The non-electric quantity detection method requires a large number of sensors, and it is difficult to timely reflect the sudden quench of the superconducting cable caused by the short-circuit current in the power grid. If the quench lasts for too long, it will seriously endanger the safe operation of the superconducting cable.

Method used

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  • Method for protecting superconductive cable
  • Method for protecting superconductive cable
  • Method for protecting superconductive cable

Examples

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Embodiment Construction

[0030] The present invention adopts three different protection strategies according to the magnitude of the superconducting cable current, that is, when the cable current is less than the quench current, the temperature, pressure and flow signals of the superconducting cable are mainly used to realize protection; when the current is greater than the quench current but less than the limit When the current is high, the inverse time overload protection is realized according to the heat accumulation inside the superconducting cable; when the cable current is greater than the limit current, the protection trips without delay.

[0031] The present invention involves two key setting value calculations: limiting current setting value I set and heat accumulation setting value θ set . There may be different calculation and setting methods according to the specific structure and cooling conditions of the superconducting cable. An example is given below to illustrate.

[0032] (1) Limiti...

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Abstract

The method uses three protective strategies. When the current in the cable is less than minimum quench current, the protection is made by monitoring temperature rise, flow rate and pressure at the both ends of cable. When the current in the cable is between the minimum quench current and limited failure current, the protection is made by calculating the heat accumulation in superconducting cable. When the current in cable is more than the limiting current, no time delay trip is made.

Description

technical field [0001] The invention belongs to the technical field of electric engineering, and in particular relates to a superconducting cable protection method, which is especially suitable for superconducting cable quench protection under short circuit conditions. Background technique [0002] After the superconducting cable is quenched, it will change from the superconducting state to the normal state, which will have an adverse effect on the superconducting cable body. Quench detection and protection of superconducting cables is one of the key technical issues that need to be solved in the practical application of superconducting cables. At present, the detection of superconducting cable quenching is mainly based on non-electrical quantities, including temperature, pressure, flow velocity, and ultrasonic detection (see Yu Xiaoyan, Li Jingdong, Tang Yuejin. Basic Research on Quench Detection of Superconducting Power Devices. Chinese Engineering Science, 2003, Vol. 5, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H5/00H02H5/04H02H5/08
Inventor 张哲唐跃进曹昆南李敬东尹项根杨军任安林张勇刚
Owner 北京云电英纳超导电力技术有限公司
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