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Closed discharge gap triggered by plasma jet and application thereof

A plasma and discharge gap technology, which is applied in the direction of plasma, spark gap overvoltage arresters, circuits, etc., can solve the problems of too small gap current, arc extinguishing, etc., achieve small leakage current, prevent gap current interruption, increase Effect of large working range and lifetime

Pending Publication Date: 2019-11-08
西安西交瑞力电气研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can also inject plasma jets multiple times in sequence to solve the problem of arc extinguishment caused by too small gap current, prevent gap current interruption, and replace complex and high-cost energy storage freewheeling devices

Method used

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  • Closed discharge gap triggered by plasma jet and application thereof
  • Closed discharge gap triggered by plasma jet and application thereof
  • Closed discharge gap triggered by plasma jet and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] see figure 2 , the closed discharge gap triggered by the plasma jet is externally connected to the high-voltage isolated power supply P, the fixed part of the controllable arrester OA, the short-circuit part of the controllable arrester OB, the high-voltage bus M and the neutral line G; among them, the isolated power supply P i with plasma trigger T i Connected to the power supply terminal, P 1 The main insulation to the ground should have the same voltage level as the high-voltage bus M, P 2 Due to the possible overvoltage of the neutral line, the main insulation to the ground should also have the same voltage level as the high-voltage bus M; the high-voltage bus M is connected to the high-voltage end of the fixed part of the controllable arrester OA; the low-voltage end of the fixed part of the controllable arrester OA is connected to the The high-voltage end of the short-circuit part OB of the controllable arrester is connected with the high-voltage contact CA;

...

Embodiment 2

[0057] see image 3 The high-voltage contact CA and the low-voltage contact CB are made of copper-tungsten alloy, and two sets of independent plasma injection units are respectively installed; the high-voltage electrode DAi, the low-voltage electrode DBi and the pulse electrode DCi are made of copper-tungsten alloy; the erosion material Bi is made of high-density polymer. Ethylene; the pipe diameter of the erosion chamber Qi is 5mm, and the pipe length is 80mm; the nozzle Ni is an expanded cone angle, and the full angle of the cone angle is 8°; the plasma trigger Ti can output a pulse voltage of 100kV first, and then output a peak value of 20kA, pulse Pulse current with a width of 100us; plasma trigger T 1 and T 3 Connect in parallel to the isolated power supply P 1 , the plasma trigger T 2 and T 4 Connect in parallel to the isolated power supply P 2 , isolated power supply P i It has the same voltage level as the high-voltage busbar M; the fully enclosed shell E is comp...

Embodiment 3

[0061] see Figure 4 , the high-voltage contact CA and the low-voltage contact CB are made of copper-tungsten alloy, the low-voltage contact CB is equipped with 4 sets of independent plasma injection units, and the high-voltage contact CA is not installed. The advantage of this is that only one isolated power supply P is needed in total. The high-voltage electrode DAi, the low-voltage electrode DBi and the pulse electrode DCi are made of copper-tungsten alloy; the erosion material Bi is made of polycarbonate; the diameter of the erosion chamber Qi is 3mm, and the length of the pipe is 50mm; The full angle is 15°; the plasma trigger Ti can output a pulse voltage of 50kV first, and then output a pulse current with a peak value of 10kA and a pulse width of 50us; the plasma trigger T i Parallel connection to the isolated power supply P, the isolated power supply P has the same voltage level as the high-voltage bus M; the fully enclosed shell E is composed of a metal shell EG and a...

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Abstract

The invention discloses a closed discharge gap triggered by a plasma jet and an application thereof. The closed discharge gap comprises a plasma spraying unit comprising an injection device and a plasma trigger T, wherein the injection device is arranged in a contact unit, generates plasmas and ablate the ablation materials through pulse voltages and currents and generates a plasma jet by adoptinga capillary action of an elongated cavity, the injection device is connected with a plasma trigger T through the high voltage wire LA, the contact unit is arranged in the cavity unit for tolerance ofarc ablation, the cavity unit is used for providing a closed high-pressure gaseous medium environment. The closed discharge gap can ensure the reliable operation in the low work parameters, improvesthe control performances of the discharge gap, increases the work range and service life of the discharge gap, solves the problems that the arc is extinguished due to the small gap current, avoids thegap breaking, and replaces the complex and high-cost energy storage and freewheeling device.

Description

technical field [0001] The invention belongs to the technical field of controllable lightning arresters, and in particular relates to a closed discharge gap triggered by plasma jets and its application. Background technique [0002] Surge arresters are often used in overvoltage protection of DC power transmission and transformation equipment to limit lightning overvoltage and operating overvoltage. For surge arresters, charging rate and residual voltage are two important technical parameters, but there is an inherent contradiction between them. The lower the charge rate of the arrester means that the current flowing through the arrester is smaller when it is working normally, and the corresponding arrester has low energy consumption, low heat generation, and slow aging speed; in order to achieve a low charge rate, it is necessary to connect more The arrester valve plate. The low residual voltage of the arrester means that when the surge current arrives, the overvoltage at ...

Claims

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Application Information

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IPC IPC(8): H05H1/32H01T1/20H01T4/12
CPCH05H1/32H01T1/20H01T4/12
Inventor 黄易之杨兰均黄涛
Owner 西安西交瑞力电气研究院有限公司
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