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A breaking method of a high-voltage superconducting current-limiting DC circuit breaker

A DC circuit breaker, superconducting current limiting technology

Inactive Publication Date: 2016-09-28
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is undoubtedly a great progress, but there are still some defects; such as the large number of power electronic components required, and many standby backup components are required from the perspective of safety and reliability; the volume is large, the control system is complicated, the price is expensive, and the protection and control coordination is not yet available. It needs to be considered; the type test items need to be further discussed and determined; especially the reliability and operation of power grids with different topological structures need to be tested.

Method used

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  • A breaking method of a high-voltage superconducting current-limiting DC circuit breaker
  • A breaking method of a high-voltage superconducting current-limiting DC circuit breaker

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Embodiment Construction

[0031] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0032] The purpose of the invention is to use existing commercialized superconducting materials to explore new superconducting switch technology and develop the application of superconducting in the field of direct current transmission. The goal is to invent a new high-voltage DC superconducting current-limiting circuit breaker that combines superconductivity with other advanced technologies, which can not only meet the basic requirements of DC circuit breakers, but also have the ability It is limited to minimize the impact and damage of the short-circuit current on the system; at the same time, it simplifies the control and integrates the functions of detection, triggering, current limiting, breaking, and isolation. It is expected that the cost can be comparable to that of ABB's hybrid DC circuit breaker, but its short-circuit breaking capacity can be larger...

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Abstract

The invention provides a method for breaking a high-voltage (HV) superconducting current-limiting direct current (DC) circuit breaker. The method comprises the following steps: when a HVDC side is in short-circuit fault and current / current rising steepness rises rapidly and reaches a critical value of a current limiter, a superconducting material quenches immediately, impedance rises steeply, short-circuit current is limited within set values, and meanwhile, an instruction is sent to an ultra-quick mechanical switch; the ultra-quick mechanical switch acts immediately, enables contacts to separate at an ultrahigh rigid separating speed so as to form a physical gap and generate electric arcs, and immediately sends a breaking instruction to a power electronic switch; the power electronic switch quickly breaks the short-circuit current and enables the electric arcs between the contacts to be extinguished, so as to form an isolated fracture; when the contacts are separated to final open positions and current in a lightning arrester is attenuated to zero, the HV superconducting current-limiting DC circuit breaker completes a whole breaking process, and a HVDC transmission power grid is isolated from a faulty line. The method has the advantages that the cost performances of different components are taken into account comprehensively, so that the cooperation is optimized; the number of components and devices is reduced as much as possible, so that the size is reduced, the weight is reduced, and the reliability is improved.

Description

technical field [0001] The invention relates to a circuit breaker, in particular to a high-voltage superconducting current-limiting DC circuit breaker and a breaking method thereof. Background technique [0002] Reliable and efficient power supply and the exploitation and utilization of renewable resources pose great challenges to improve power transmission modes. Based on the advantages of low loss, long-distance, high-power transmission, more efficient connection of renewable energy into the grid, and flexible operation, high-voltage direct current transmission has received new attention. In particular, the emergence of flexible DC transmission technology based on voltage source converters makes the preparation and development of multi-terminal HVDC grids possible and more and more attractive. A DC circuit breaker with the functions of quickly breaking DC fault current and isolating faults is an essential and crucial component for realizing a multi-terminal high-voltage D...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/28
CPCY02E40/60
Inventor 马钊安婷邱宇峰
Owner STATE GRID CORP OF CHINA
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