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System and method for measuring intensity of long air gap lightning stroke discharging electric field

A technology of air gap and electric field strength, which is applied in the field of power system, can solve the problems of poor lightning protection ability of power system, inability to study, low accuracy of electric field strength, etc., achieve high numerical accuracy and improve lightning protection ability

Active Publication Date: 2016-08-17
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 electric field intensity obtained by using the discharge characteristic test is low, which prevents the in-depth understanding of 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 intensity of long air gap lightning stroke discharging electric field
  • System and method for measuring intensity of long air gap lightning stroke discharging electric field
  • System and method for measuring intensity of long air gap lightning stroke discharging electric field

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Embodiment 1

[0036] see figure 1 , the embodiment of the present invention provides a long air gap lightning discharge electric field intensity measurement system, including an impulse voltage generator 10, a capacitor 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 divid...

Embodiment 2

[0048] see figure 2 , in this embodiment, a kind of long air gap lightning discharge electric field intensity measurement method is provided, this measurement method adopts the measurement system of long air gap lightning discharge electric field intensity recorded in embodiment 1, is used in long air gap lightning strike During the discharge process, measure the electric field strength of the streamer, leader and final jump transition process.

[0049] Specifically, the method for measuring the electric field intensity of a lightning strike 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...

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Abstract

The invention discloses a system and method for measuring the intensity of a long air gap lightning stroke discharging electric field, and relates to the technical field of electric systems. The system and method are used for acquiring high-precision electric field intensity of the streamer, guidance and tail leap conversion processes, improving the deep degree of discharging physical mechanism research under long air gap lightning impulses, and finally improving the lightning preventing capacity of the electric systems. The system for measuring the intensity of the long air gap lightning stroke discharging electric field comprises an impulse voltage generator, a capacitive voltage divider, a measuring resistor, a plate electrode, a bar electrode located above the plate electrode, a spectrograph, an ICCD camera and an oscilloscope. The measuring system in the technical scheme is applied to the method for measuring the intensity of the long air gap lightning stroke discharging electric field. The system and method for measuring the intensity of the long air gap lightning stroke discharging electric field are used for study of lightning defense of the electric systems.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a measurement system and method for electric field intensity of lightning discharge with long air gap. 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 electric field strength in the process of streamer, pilot and last jump transition, and then make the streamer, pilot and The temporal and spatial variation images of the electric field intensity during the conversion process of the last jump are used to analyze the physical mechan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R29/08
Inventor 贾磊蔡汉生刘刚胡上茂廖民传冯宾韩永霞杨杰阮耀萱
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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