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System and method for measuring lightning discharge electron density in long air gap

A technology of air gap and electron density, applied in the field of power system, can solve the problems of poor lightning protection ability of power system, inability to study, low precision of electronic density, etc., and achieve the effect of improving depth, high numerical precision and improving lightning protection ability.

Active Publication Date: 2016-07-27
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Application Information

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Problems solved by technology

However, in the prior art, the accuracy of the electron density of the streamer, leader, and final jump conversion processes obtained by using the discharge characteristic test is low, which makes it impossible for the prior art to deeply study the physical mechanism of the discharge under long air gap lightning strikes. research, which leads to the inability to set reasonable protection measures in the power system, and ultimately leads to poor lightning protection capabilities of the power system

Method used

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  • System and method for measuring lightning discharge electron density in long air gap
  • System and method for measuring lightning discharge electron density in long air gap

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Embodiment 1

[0036] see figure 1 , the embodiment of the present invention provides a long air gap lightning discharge electron density measurement system, including an impulse voltage generator 10, a capacitive voltage divider 11, a measuring resistor 12, a rod electrode 22, a plate electrode 21, a spectrometer 30, and an ICCD camera 34 and oscilloscope 40.

[0037] Impulse voltage generator 10 is a voltage generating device capable of simulating lightning strike discharge, and is usually used for electrical equipment and other test products to conduct impulse voltage tests of full-wave lightning impulse voltage, cut-wave lightning impulse voltage and operating impulse voltage wave to test insulation performance . In this embodiment, the impulse voltage generator 10 has a rated voltage of at least 2000kv, has an output terminal and an input terminal, the output terminal is connected to the rod electrode 22, and the input terminal is grounded.

[0038] The capacitive voltage divider 11 i...

Embodiment 2

[0048] see figure 2 , in this embodiment, a kind of long air gap lightning discharge electron density measurement method is provided, this measurement method adopts the measurement system of long air gap lightning discharge electron density recorded in embodiment 1, is used for During the discharge process, the electron density of the streamer, the leader and the last transition process are measured.

[0049] Specifically, the method for measuring the electron density of a lightning discharge with a long air gap provided in this embodiment includes:

[0050] Step S10, calculating the 50% breakdown discharge voltage U of the long air gap lightning discharge 50％ . The breakdown discharge voltage in this step is a voltage at which a half of impulse voltages are applied between the rod electrode and the plate electrode a plurality of times to cause breakdown.

[0051] Step S20, applying a pulse voltage between the rod electrode and the plate electrode, the waveform of the puls...

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Abstract

The invention discloses a system and a method for measuring lightning discharge electron density in a long air gap and relates to the technical field of an electric power system. The measuring system and method are used for acquiring the electron density of a high-precision pouring, guidance and tail-jump conversion process, promoting the degree of research on a discharge physical mechanism under long air gap lightning surge and finally increasing the lightning protection capacity of the electric power system. The measuring system comprises an impulse voltage generator, a capacitive voltage divider, a measuring resistor, a plate electrode, a rod electrode, a spectrograph, an ICCD camera and an oscilloscope, wherein the rod electrode is located above the plate electrode. The measuring method is applied to the measuring system provided by the technical scheme. The measuring system and method provided by the invention are applied to the research on lightening prevention of the electric power system.

Description

technical field [0001] The invention relates to the technical field of electric power systems, in particular to a measurement system and method for the electron density of long air gap lightning discharge. Background technique [0002] Lightning strike is one of the main causes of transmission line tripping. Therefore, the study of discharge physical mechanism, protective measures and numerical simulation methods under long air gap lightning strike is the focus and difficulty of power system lightning protection research. [0003] In the prior art, in the study of the physical mechanism of discharge under long air gap lightning impact, the discharge characteristic test is mainly used to obtain the electron density in the process of streamer, leader and last jump conversion, and then make the streamer, leader In order to analyze the physical mechanism of discharge under long air gap lightning impact, the spatiotemporal change image of electron density during the conversion pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/25G01N21/27
CPCG01N21/25G01N21/27
Inventor 贾磊蔡汉生刘刚胡上茂施健张义韩永霞阮耀萱
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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