Liquid metal current limiting device based on insulating baffle plate and liquid metal current limiting method thereof

A technology of liquid metal and insulating baffles, which is applied to the fault current in medium-voltage or low-voltage switchgear, limits the high-voltage field, and can solve problems such as long arcing time, application restrictions, and unavoidable power consumption, so as to reduce the burden, Effect of suppressing short-circuit fault current

CN106026059AActive Publication Date: 2016-10-12XI AN JIAOTONG UNIV +2
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2016-10-12

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Abstract

The invention provides a liquid metal current limiting device based on an insulating baffle plate and a liquid metal current limiting method thereof. According to the device, a fast transfer switch and a liquid metal current limiting unit are combined through a mechanical connecting rod so as to enhance the rated current and the current limiting efficiency of a current limiter. The rated current flows through the fast transfer switch and almost has no loss of conduction under the normal working condition; when a short circuit fault occurs, the fast transfer switch is driven to be fast turned on by a metal repulsion plate so that fault current is enabled to be completely transferred to the liquid metal current limiting unit, the metal repulsion plate drives the insulating baffle plate in the current limiting device to move and thus the throughflow hole fluid column in the current limiting unit is enabled to rapidly reduce and contract and strike arc. The arc column in the current limiting unit can be rapidly extruded by the method through mutual staggering of the baffle plate and insulating separating plates so that high-efficiency current limiting can be realized. The liquid metal current limiting device based on the insulating baffle plate is simple in structure and particularly suitable for limiting fault current of the AC / DC system of the field of median and low voltage so as to reduce the burden of circuit breakers and other electrical equipment.
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Description

technical field

[0001] The invention belongs to the technical field of limiting fault current in high-voltage, medium-voltage or low-voltage switchgear, and in particular relates to a liquid metal current limiting device and method based on an insulating baffle. Background technique

[0002] With the increase of power system capacity year by year, the short-circuit capacity and short-circuit current level of the power grid are also increasing, which has become an important problem restricting the operation and development of the power grid. Therefore, research on effective short-circuit current limiting devices to limit the short-circuit capacity of the power system and improve the reliability of the power system has become an urgent issue for the safe and stable operation of the power system and the construction and development of power systems in my country. So far, the technologies applied to short-circuit current limiting mainly include: series current-limiting reactance...

Examples

Embodiment Construction

[0023] Below in conjunction with accompanying drawing and specific embodiment the present invention is further described;

[0024] In one embodiment, the present invention discloses a liquid metal current limiting device based on an insulating baffle, and the device includes: a fast transfer switch, a liquid metal current limiting unit and a circuit breaker;

[0025] The quick transfer switch and the liquid metal current limiting unit are connected through an insulating connecting rod, and the quick transfer switch and the liquid metal current limiting unit are connected in parallel;

[0026] The fast transfer switch and the liquid metal current limiting unit are connected in parallel and connected in series with the circuit breaker;

[0027] The quick transfer switch includes a main connecting rod, and the liquid metal current limiting unit includes a pull rod;

[0028] The main connecting rod is connected with the pull rod through an insulating connecting rod.

[0029] In ...