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A liquid metal current limiting device and method

A technology of liquid metal and current limiting device, applied in emergency protection circuit devices, circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc. Short service life and other problems, to achieve the effect of small on-state loss, good electrical conductivity, and accelerated current limiting speed

Inactive Publication Date: 2019-01-04
STATE GRID SHAANXI ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, when a fault occurs, the resistance of the thermistor will increase sharply, and a voltage limiting device must be connected in parallel. In addition, there are problems such as long recovery time and short service life.

Method used

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  • A liquid metal current limiting device and method
  • A liquid metal current limiting device and method
  • A liquid metal current limiting device and method

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Embodiment Construction

[0034] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments, but not as a limitation of the present invention.

[0035] Such as figure 1 , figure 2 , image 3 As shown, a liquid metal current limiter includes a first anode electrode 1a, a first cathode electrode 1b, a second anode electrode 2a, a second cathode electrode 2b, an insulating partition 3, a movable insulating barrier 4, and an insulating shell 5. Insulation top cover6.

[0036] The first anode electrode 1a and the second anode electrode 2a are arranged on one end side wall of the insulating shell 5, and the first cathode electrode 1b and the second cathode electrode 2b are arranged on the other end side wall of the insulating shell 5; The top cover 6 forms a closed cavity with the first anode electrode 1a, the first cathode electrode 1b, the second anode electrode 2a and the second cathode electrode 2b. Two insulating partitions 3 are arranged i...

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Abstract

The invention provides a novel liquid metal current limiting device and method. The device comprises a current detection device, a circuit breaker and a liquid metal current limiter, wherein a first anode electrode, a first cathode electrode and a liquid metal flowing through a first rectangular through hole and a second rectangular through hole in the liquid metal current limiter form a first current main loop under a normal working condition; and a second anode electrode, a second cathode electrode and a liquid metal flowing through a first round through hole and a second round through hole form a second current branch during a short circuit fault. The novel liquid metal current limiting device provided by the invention is simple in structure, and especially suitable for limiting fault currents of AC and DC systems in a medium and low voltage field, and can trigger arcing in time when detecting the fault currents, so as to realize high efficiency current limiting, and help to reduce the burden of circuit breakers and various electrical equipment.

Description

technical field [0001] The invention belongs to the technical field of circuit control, in particular to the technical field of limiting fault current in high-voltage, medium-voltage or low-voltage switchgear, and more particularly relates to a liquid metal current limiting device and method. Background technique [0002] At present, my country's power system is moving towards higher voltage levels and larger capacity transmission. The increasing short-circuit current and short-circuit capacity have brought a great threat to the safety and reliability of the system. How to quickly and effectively limit short-circuit Current has become a hotspot of current research. Installing current-limiting equipment in the line does not need to change the existing operation mode of the system, and has the characteristics of flexible protection. It is an ideal measure to limit the fault current. So far, the technologies applied to short-circuit current limiting mainly include: solid-state ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/02
CPCH02H9/02
Inventor 郭安祥刘子瑞吴翊何海龙纽春萍吕思雨杨倬
Owner STATE GRID SHAANXI ELECTRIC POWER RES INST
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