A liquid metal fault current limiter and its current limiting method
A fault current, liquid metal technology, applied in the field of electric power, can solve the problems of inability to carry rated current, short current limiting response time, small aperture of the current limiting main through hole, etc., achieving novel structure, fast current limiting response, limited The effect of high flow efficiency
Active Publication Date: 2020-01-31
XI AN JIAOTONG UNIV
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Problems solved by technology
[0003] However, both of the above two current-limiting technologies have certain rated current problems: in order to ensure a short current-limiting response time, the aperture of the main current-limiting orifice is kept small, resulting in the inability to carry the rated current.
Therefore, the existing current limiter can only use a parallel high-speed mechanism to carry the current, and limit the fault current through current transfer when the fault current occurs
Method used
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[0034] The following will be combined with Figure 1 to Figure 3(c) , clearly and completely describe the technical solutions in the embodiments of the present invention, obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0035] see figure 1 , figure 2 , a liquid metal fault current limiter, comprising: a liquid metal 1, an upper copper electrode 2-1, a lower copper electrode 2-2, an upper insulating partition 3-1, a lower insulating partition 3-2, and an arc starting hole 4. The main flow hole 5 and the current limiter body 6; wherein, the liquid metal 1 is placed in the current limiter body 6; one side of the upper insulating partition 3-1 is fixed to the current limiter The top of the main body 6 of the...
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Abstract
The invention discloses a liquid metal fault current limiter comprising liquid metal, an upper copper electrode, a lower copper electrode, an upper insulating baffle, a lower insulating baffle, an auxiliary arc starting hole, a main flow through hole and a current limiter body. The invention also discloses a fault current limiting method which comprises the following steps: 1, arc starting of thesmall arc starting hole; 2, arc starting of the main flow through hole; and 3, arc quenching of the mall arc starting hole and continuous arcing of the main flow through hole. The rated flow through capacity is ensured by selecting the main flow through hole with a larger diameter; and arcing of the main flow through hole is induced by arcing of the small hole and thus fast current limiting response is realized.
Description
technical field [0001] The disclosure belongs to the field of electric power technology, and in particular relates to a liquid metal fault current limiter and a current limiting method thereof. Background technique [0002] With the rapid development of my country's economy, the requirements for the capacity of the DC power supply system are getting higher and higher, and the short-circuit capacity and short-circuit current level of the DC power grid are also increasing. At present, the breaking capacity of medium-voltage DC circuit breakers still cannot meet the short-circuit capacity requirements of medium-voltage DC power grids. Therefore, it is necessary to study an effective DC fault current limiter to limit the short-circuit capacity of the DC power system, thereby reducing the design requirements of the DC circuit breaker and improving the operational reliability of the power system. So far, the self-restoring liquid metal current limiting technologies applied to DC ...
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IPC IPC(8): H02H9/02
CPCH02H9/02
Inventor 何海龙赵鹏吴翊杨飞杨倬李佳泽
Owner XI AN JIAOTONG UNIV