CN106370938A - Long-gap discharge leader development speed measurement method based on radiated electromagnetic wave detection - Google Patents

Long-gap discharge leader development speed measurement method based on radiated electromagnetic wave detection Download PDF

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Publication number
CN106370938A
CN106370938A CN201610742483.1A CN201610742483A CN106370938A CN 106370938 A CN106370938 A CN 106370938A CN 201610742483 A CN201610742483 A CN 201610742483A CN 106370938 A CN106370938 A CN 106370938A
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CN
China
Prior art keywords
antenna
development speed
electromagnetic wave
guide
gap discharge
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CN201610742483.1A
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Chinese (zh)
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CN106370938B (en
Inventor
李涵
夏学智
周文俊
喻剑辉
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Wuhan University WHU
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Wuhan University WHU
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Priority to CN201610742483.1A priority Critical patent/CN106370938B/en
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Publication of CN106370938B publication Critical patent/CN106370938B/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/08—Measuring electromagnetic field characteristics
    • G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
    • G01R29/0892—Details related to signal analysis or treatment; presenting results, e.g. displays; measuring specific signal features other than field strength, e.g. polarisation, field modes, phase, envelope, maximum value
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/08—Measuring electromagnetic field characteristics
    • G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
    • G01R29/0871—Complete apparatus or systems; circuits, e.g. receivers or amplifiers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing

Abstract

The invention relates to a long-gap discharge leader development speed measurement method based on radiated electromagnetic wave detection. The method comprises a set of high-frequency antennas and a high-speed oscilloscope and a long-gap discharge leader development speed calculating method. The method adopts a certain antenna arrangement form; long-gap discharge radiated electromagnetic wave pulse time is detected simultaneously through the plurality of antennas; leader head position is positioned according to time difference of a signal arriving at different antennas; and furthermore, the long-gap discharge leader development speed can be calculated. The method can effectively improve the measurement precision of the discharge leader development speed, and resolution reaches the level of 0.1 ns.

Description

A kind of large air gap discharge guide's development speed measurement based on radiated electromagnetic wave detection Method
Technical field
The present invention relates to a kind of large air gap discharge guide's development speed measuring method based on radiated electromagnetic wave detection.
Background technology
The persistent period that long gap (more than 50cm) discharges is very short (1～10 μ s).Electric discharge guide development speed quickly, mesh Front use high-speed camera instrument catches the two-phonon process of large air gap discharge guide development although maximum time resolution is up to 1 μ s, but Still it is difficult to evolution and the speed of accurate measurement electric discharge guide.
Now with the development of UHV transmission, the observation of large air gap discharge and study mechanism highlight important practical valency Value, in the urgent need to the discharge parameter measuring method of higher longitude.When electromagnetic wave detecting method proposed by the present invention has 0.1ns level Between resolution, can effectively improve electric discharge guide's development speed certainty of measurement.
Content of the invention
The purpose of the present invention is: for the problems referred to above, provides and a kind of is sent out based on the large air gap discharge guide of radiated electromagnetic wave Exhibition speed measurement method, improves certainty of measurement.
The present invention to achieve these goals, adopts the following technical scheme that
The present invention is directed to the problems referred to above, provides a kind of measurement of large air gap discharge guide's development speed based on radiated electromagnetic wave Method, the method can measure guide's development speed of large air gap discharge, improves certainty of measurement.
Present invention provide the technical scheme that
A kind of large air gap discharge guide's development speed measuring method based on radiated electromagnetic wave detection, its characteristic is, bag Include following steps:
Step 1, a set of high frequency antenna and high-speed oscilloscope are arranged near electrode to be measured, specifically will at least two Individual measurement antenna is arranged in the place away from electrode, and positioned at the far-field range of large air gap discharge, antenna parameter is consistent, plans direction Identical with discharge channel direction；
Step 2, is obtained the time difference δ t of two signals, concrete grammar is by high-speed oscilloscope: channel oscilloscope number is more than sky Line number amount, bandwidth is mated with the beamwidth of antenna, and sample rate is not less than 5ghz, and impedance is 50 ω, and two antennas collect due to electric discharge first Lead radiation electromagnetic wave reach two antennas the waveform that causes of time difference is identical, two signals that the time has minute differences
Step 3, calculates large air gap discharge guide's development speed.
In above-mentioned large air gap discharge guide's development speed measuring method based on radiated electromagnetic wave detection, described step 3 Defined in high-field electrode be h to ground level, definition discharge channel is straight line, and perpendicular to ground, t electric discharge leader length For l, the distance of guide's head to antenna a is a, and the distance to antenna b is b, and propagation velocity of electromagnetic wave is light velocity c, the height of antenna a Spend for ha, the height of antenna b is ha, the ground distance of discharge channel to two antennas is d,
a = ( h - l - h a ) 2 + d 2 , b = ( h - l - h b ) 2 + d 2 ,
ta=t+a/c, tb=t+b/c, δ t=ta-tb=(a-b)/c,
According to above formula it is known that two aerial signal time differences are δ t, leader length l can be tried to achieve, then guide's development speed For δ l/ δ t.
In above-mentioned large air gap discharge guide's development speed measuring method based on radiated electromagnetic wave detection, described step 1 In it is only necessary to during the one-dimensional development speed of measurement guide, using two vertically arranged electromagnetic horns, antenna height and spacing with Discharge channel is consistent, and two horn mouths are generally aligned in the same plane, and antenna and its feed line impedance parameter are consistent.
The present invention has the advantage that the large air gap discharge guide's development speed based on radiated electromagnetic wave that the present invention provides Measuring method can effectively improve the certainty of measurement of electric discharge guide's development speed, and resolution reaches 0.1ns level.
Brief description
Fig. 1 is test arrangement schematic diagram according to the present invention.
Fig. 2 is large air gap discharge radiated electromagnetic wave waveform diagram in the embodiment of the present invention.
Fig. 3 is large air gap discharge guide development speed schematic diagram calculation in inventive embodiments.
Specific embodiment
Below in conjunction with the accompanying drawings and embodiment, the present invention is described in further detail.
Referring to Fig. 1, the test arrangement requirement of the present invention measures antenna away from electrode, positioned at the far field model of large air gap discharge Enclose, antenna parameter is consistent, and polarised direction is identical with discharge channel direction, channel oscilloscope number should be greater than, equal to antenna amount, carrying Width is mated with the beamwidth of antenna, and sample rate is not less than 5ghz.When the one-dimensional development speed only needing to measure guide, can be hung down using two The electromagnetic horn (a1, a2 as in Fig. 1) of straight arrangement, antenna height and spacing are consistent substantially with discharge channel, two loudspeaker Mouth is generally aligned in the same plane, and antenna and its feeder line parameter are consistent, and channel oscilloscope input impedance is 50 ω.
Referring to Fig. 2, in use, two antennas collect that waveform is identical, the time has the two of minute differences to the present invention Signal, is mainly caused by the time difference that the electromagnetic wave of electric discharge guide's radiation reaches two antennas.This time difference is with guide's Develop and change, different time corresponding guide head position can be asked for by plane geometry algorithm, and then it is one-dimensional to obtain guide Development speed.
Referring to Fig. 3, the present invention in calculating process it is known that high-field electrode to ground level be h it is assumed that discharge channel is straight Line, and perpendicular to ground；
T electric discharge leader length is l；
The distance of guide's head to antenna a is a, and the distance to antenna b is b, and propagation velocity of electromagnetic wave is light velocity c；
The height of antenna a is ha, the height of antenna b is ha, the ground distance of discharge channel to two antennas is d；
a = ( h - l - h a ) 2 + d 2
b = ( h - l - h b ) 2 + d 2
ta=t+a/c
tb=t+b/c
δ t=ta-tb=(a-b)/c
According to above formula it is known that two aerial signal time differences are δ t, leader length l can be tried to achieve, then guide's development speed For δ l/ δ t.

Claims (3)

1. a kind of large air gap discharge guide's development speed measuring method based on radiated electromagnetic wave detection, its characteristic is, including Following steps:
Step 1, a set of high frequency antenna and high-speed oscilloscope are arranged near electrode to be measured, specifically survey at least two Amount antenna is arranged in the place away from electrode, and positioned at the far-field range of large air gap discharge, antenna parameter is consistent, plans direction and puts Electric channel direction is identical；
Step 2, is obtained the time difference δ t of two signals, concrete grammar is by high-speed oscilloscope: channel oscilloscope number is more than antenna number Amount, bandwidth is mated with the beamwidth of antenna, and sample rate is not less than 5ghz, and impedance is 50 ω, and two antennas collect due to the guide's spoke that discharges Two signals that the waveform that the time difference of electromagnetic wave arrival two antennas penetrated causes is identical, the time has minute differences
Step 3, calculates large air gap discharge guide's development speed.
2. the large air gap discharge guide's development speed measuring method based on radiated electromagnetic wave detection according to claim 1, It is characterized in that: defined in described step 3, high-field electrode is h to ground level, and definition discharge channel is straight line, and perpendicular to ground Face, t electric discharge leader length is l, and the distance of guide's head to antenna a is a, and the distance to antenna b is b, electromagnetic wave propagation Speed is light velocity c, and the height of antenna a is ha, the height of antenna b is ha, the ground distance of discharge channel to two antennas is d,
a = ( h - l - h a ) 2 + d 2 , b = ( h - l - h b ) 2 + d 2 ,
ta=t+a/c, tb=t+b/c, δ t=ta-tb=(a-b)/c,
According to above formula it is known that two aerial signal time differences are δ t, leader length l can be tried to achieve, then guide's development speed is δ l/δt.
3. the large air gap discharge guide's development speed measuring method based on radiated electromagnetic wave detection according to claim 1, It is characterized in that: in described step 1 it is only necessary to measurement guide one-dimensional development speed when, using two vertically arranged loudspeaker Antenna, antenna height and spacing and discharge channel are consistent, and two horn mouths are generally aligned in the same plane, and antenna and its feed line impedance are joined Number is consistent.
CN201610742483.1A 2016-08-26 2016-08-26 Long-gap discharge lead development speed measuring method based on radiation electromagnetic wave detection Expired - Fee Related CN106370938B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115061015A (en) * 2022-05-18 2022-09-16 云南电网有限责任公司玉溪供电局 Speed-current curve experimental method for transmission line uplink pilot development model

Citations (5)

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JP4217728B2 (en) * 2006-05-25 2009-02-04 中国電力株式会社 Lightning strike advanced evaluation apparatus and method, lightning charge evaluation apparatus and method, lightning charge advanced evaluation program
CN102681034A (en) * 2011-03-14 2012-09-19 株式会社日立工业设备技术 Lightning position calibration device and lightning area conjecture method
CN103336206A (en) * 2013-06-27 2013-10-02 清华大学 Insulator flashover simulation method based on pilot development model and applicable to lightning counterattack
CN104569749A (en) * 2014-12-10 2015-04-29 华南理工大学 Distinguishing method of high-altitude long-air-gap lightning stroke flashover

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001004731A (en) * 1999-06-17 2001-01-12 Japan Science & Technology Corp Broad-band interferometer
JP4217728B2 (en) * 2006-05-25 2009-02-04 中国電力株式会社 Lightning strike advanced evaluation apparatus and method, lightning charge evaluation apparatus and method, lightning charge advanced evaluation program
CN102681034A (en) * 2011-03-14 2012-09-19 株式会社日立工业设备技术 Lightning position calibration device and lightning area conjecture method
CN103336206A (en) * 2013-06-27 2013-10-02 清华大学 Insulator flashover simulation method based on pilot development model and applicable to lightning counterattack
CN104569749A (en) * 2014-12-10 2015-04-29 华南理工大学 Distinguishing method of high-altitude long-air-gap lightning stroke flashover

Non-Patent Citations (1)

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Title
耿屹楠 等: "利用先导通道三维空间结构研究的先导发展速度", 《高电压技术》 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115061015A (en) * 2022-05-18 2022-09-16 云南电网有限责任公司玉溪供电局 Speed-current curve experimental method for transmission line uplink pilot development model

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