Vacuum lightning protection gap device based on hollow cathode effect

A hollow cathode effect and vacuum technology, which is applied in the direction of spark gap overvoltage arresters, spark gaps, electrical components, etc., can solve the problems of endangering the safety of the power system, high use and maintenance costs, and short service life, so as to reduce lightning strikes Trip rate, low maintenance cost, and long service life

Active Publication Date: 2016-07-20
XI AN JIAOTONG UNIV +2
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Problems solved by technology

[0003] 1. Most of the existing lightning protection gap devices with air jets are complex in structure, large in size, high in use and maintenance costs, and prone to damage and failure
Moreover, the service life is short, limited by the number of gas pills used for arc extinguishing, it can only work several times or even once, and needs to be replaced frequently
[0004] 2. Although the existing line arrester is cheap and has a strong ability to suppress overvoltage, it may not be able to disengage automatically when a fault occurs, endangering the safety of the power system. Disposable

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  • Vacuum lightning protection gap device based on hollow cathode effect

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Embodiment Construction

[0013] combined with figure 1 And specific embodiment, the present invention is further described, but this embodiment does not limit the protection scope of the present invention.

[0014] In one embodiment, the present invention provides a novel vacuum lightning protection gap device based on the hollow cathode effect;

[0015] The device comprises a vacuum gap unit (1) and a pressure dividing circuit unit (2);

[0016] The vacuum gap unit (1) is connected in parallel with the voltage dividing circuit unit (2), after the parallel connection, the upper end is connected with the high-voltage transmission line (11), and the lower end is grounded.

[0017] The device described in this embodiment has simple structure, convenient installation, extremely long service life, high reliability, and can quickly and reliably extinguish arcs. It can reduce the lightning trip rate and accident rate of the power system, protect the safety of lines and power equipment, and improve the stab...

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Abstract

The invention discloses a vacuum lightning protection gap device based on a hollow cathode effect, comprising a vacuum gap unit and a voltage division loop unit. The vacuum gap unit is of a three-electrode structure, wherein the anode and the cathode of a main gap are of a cavity structure with a hole in the center, a pre-ionization electrode is of a needle structure, and the pre-ionization electrode is arranged inside the cathode and forms a pre-ionization gap with the cathode. The voltage division loop unit is composed of a resistor and a capacitor which are connected in parallel between the main gap and the pre-ionization electrode. Compared with the existing air jet arcing lightning protection gap technology, the advantages of the device are that power-frequency follow current can be cut off in a timely and reliable manner, the device can be reused and has a long service life, and the device is convenient to produce and low in cost of maintenance. Moreover, the device is externally provided with external insulation protection, and can work safely and reliably.

Description

technical field [0001] The invention relates to the technical field of lightning protection devices for power systems, in particular to a novel vacuum lightning protection gap device based on the hollow cathode effect. Background technique [0002] At present, lightning protection of transmission lines is one of the important guarantees for the stable operation of power systems. The overvoltage generated during lightning strikes may cause flashover of power equipment, and then generate power frequency freewheeling, seriously endangering the safety of power equipment and the stable operation of the power grid. Therefore, the power sector generally adopts parallel lightning protection gaps on transmission lines or power equipment to achieve protection effects. The existing lightning arresters adopt a variety of different technical routes. Although the commonly used lightning protection gaps and line arresters with airflow injection are widely used, there are still many obviou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01T4/02H01T4/10
CPCH01T4/02H01T4/10
Inventor 丁卫东闫家启苟杨王亚楠钱凯洋韩若愚吴佳玮刘少波龙兆芝李文婷
Owner XI AN JIAOTONG UNIV
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