Self-cooling type superconducting direct-current combined switch
A combined switch and DC switch technology, which is applied in the direction of electric switches, superconducting magnets/coils, superconducting elements, etc., can solve problems affecting equipment performance and other issues
Active Publication Date: 2021-04-30
EASTERN SUPERCONDUCTOR SCI & TECH SUZHOU CO LTD
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Problems solved by technology
In addition, the circuits in the DC transmission grid generate a lot of heat during the working process, which easily affects the performance of equipment
Method used
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Embodiment
[0026] Embodiment: Based on the reason that the flexible DC transmission current has no zero crossing point, the fault current is difficult to cut off, and the DC circuit breaker is not yet mature, this application combines the current limiter and the switch together to complete the rapid isolation and removal of the DC fault, and adopts the superconducting combination The switch firstly limits the initial rising rate of the fault current and the falling rate of the DC voltage, and secondly limits the peak value of the fault current. After limiting the fault current to a certain level, the DC switch is disconnected, the fault is cleared and the DC fault is cleared. If it is a temporary fault, the reclosing operation can be performed, and if it is a permanent fault, disconnect the AC circuit breaker to completely clear the fault. The outstanding advantage of the superconducting current limiter in the superconducting combination switch is that it is close to zero resistance when ...
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The invention discloses a self-cooling type superconducting direct-current combined switch, which comprises a superconducting current limiter and a direct-current switch which are connected in series; wherein the superconducting current limiter and the direct-current switch are arranged in independent isolation cavities respectively, a low-temperature container is arranged in the isolation cavity of the superconducting current limiter, a liquid inlet pipe of the low-temperature container is communicated to the outside of the cavity, an exhaust pipe of the low-temperature container penetrates through the isolation cavity of the direct-current switch to be communicated to the outside of the cavity, and a cooling medium enters the low-temperature container through the liquid inlet pipe. The cooling medium volatilizes to reduce the temperature of the isolation chamber and is exhausted through the exhaust pipe; and an air outlet and an air inlet are arranged at the upper part and the lower part of an isolation chamber of the direct-current switch respectively. The superconducting current limiter and the direct-current switch are combined for use, so that direct-current faults can be quickly isolated and eliminated; in addition, heat in the direct-current switch is taken away through natural circulation of the cooling medium in the cavity of the superconducting current limiter, and the effect of natural cooling is achieved. Therefore, the device not only saves space and connecting cables, but also meets the compact requirement of power distribution equipment of a power grid.
Description
technical field [0001] The invention belongs to the field of DC switches and relates to a self-cooling superconducting DC combination switch. Background technique [0002] With the support of national energy policies, the construction of distributed new energy sources such as photovoltaics, wind power, and hydropower is developing rapidly, and many regions in China will face the urgent need for large-scale distributed power grid connection. Active management and control of distributed power through active distribution network technology can realize distributed power from passive consumption to active guidance and active utilization. Compared with AC distribution network, DC distribution network is more suitable for distributed power and Load access. [0003] Due to its unique characteristics of flexible control and powerful technical functions, flexible direct current transmission has broad application prospects in urban power distribution networks. In recent years, more a...
Claims
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Login to View More IPC IPC(8): H02H9/02H02H7/26H01H9/52H01F6/00H01F6/04
CPCH02H9/023H02H7/268H01H9/52H01F6/00H01F6/04H01F2006/001Y02E60/60
Inventor 牛潇晔龙翔沈玉军包颖袁文程鹏蔡渊
Owner EASTERN SUPERCONDUCTOR SCI & TECH SUZHOU CO LTD