CN104698297B - A kind of modification method of large scale coaxial cable insulation cable space charge measurement - Google Patents
A kind of modification method of large scale coaxial cable insulation cable space charge measurement Download PDFInfo
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- CN104698297B CN104698297B CN201510069075.XA CN201510069075A CN104698297B CN 104698297 B CN104698297 B CN 104698297B CN 201510069075 A CN201510069075 A CN 201510069075A CN 104698297 B CN104698297 B CN 104698297B
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Abstract
The present invention relates to a kind of modification method of large scale coaxial cable insulation cable space charge measurement, specifically includes and obtains driving pulse field strength penalty coefficient；Obtain the close intensity compensation coefficient of sound wave；Measuring signal geometrical factor amendment and etc..This method is suitable for processing procedure of the large scale coaxial cable test specimens with the signal of pulse radio-acoustic method space charge measurement, quantitative scoring counts stating the correction factor of each geometrical factor in, geometrical factor amendment is carried out to space charge measurement signal, to eliminate the influence brought due to being tested the coaxial columnar structure of sample of cable to space charge measurement signal, so as to obtain high-precision space charge measurement result.
Description
Technical field
The present invention relates to a kind of modification method of large scale coaxial cable insulation cable space charge measurement, more particularly to one kind are big
In size coaxial cable insulation cable structure, space charge measurement calibration and during acoustic signals radial propagation, because of test product geometry
The modification method that caused intensity of acoustic wave weakens.
Background technology
With the continuous development of electric system, high voltage direct current cable transmission system is lost and easy to control because of its low transmission
The advantages of fault current, not only in power transmission engineering over strait, also more and more applied in the transmission system of inland.Crosslinking
Predominating insulation of the polyethylene (XLPE) as high-voltage alternating cable, possesses excellent machinery, electric property, has obtained extensively
Application.If as direct current cables insulation under DC voltage effect, material internal can form the accumulation of space charge and move
Move, so as to cause insulating inner field strength distribution to be distorted, if local field strength is excessive will to cause cable insulation accelerated deterioration
Even final breakdown failure.Therefore, the space charge inside high-voltage DC cable insulating is measured and insulated to direct current cables
The progress and safe operation of technology have great significance.
At present, pulse radio-acoustic method (PEA) measurement space electric charge is because of its relatively low cost and good sensitivity and space
Resolution ratio, which becomes, applies most common space charge measurement method, is obtained in the measurement especially in sheet metal specimens satisfactory
Effect, be used in also of increasing concern on the space charge measurement in large scale coaxial cable test specimens.Tried with thin slice
More uniform driving pulse electric field and intensity of acoustic wave distribution situation are different in sample, in large scale coaxial cable test specimens, by
In the coaxial columnar structure of cable cause driving pulse electric field strength non-uniform Distribution and intensity of acoustic wave in radial propagation with
The increase for penetrating area and gradually weaken, so that the space charge signal not only electric charge with insulating inner of measurement gained
Density is related, also related in the position of insulating inner to it, therefore it is required that to coaxial cable in the processing procedure of measuring signal
The geometrical factor that column structure size is brought influences row compensation deals to ensure enough determining charge density precision.
The content of the invention
The technical problems to be solved by the invention, are to provide a kind of space charge based on large scale coaxial cable structure and survey
The modification method that test product geometry influences measuring signal in amount.
The method of the present invention is used for the signal of the pulse radio-acoustic method measurement space electric charge of large scale high voltage direct current cable sample
In processing procedure, the influence that the physical dimension factor of sample of cable brings space charge measurement signal can be eliminated, is obtained accurate
It is really reliable, high-precision measuring signal.
In order to solve the above technical problems, the present invention adopts the following technical scheme that method：
Step 1：Obtain driving pulse field strength penalty coefficient：Pulse voltage v is applied to sample of cablep(t), due to cable
Coaxial columnar structure so that impulse electric field is not equally distributed in cable insulation, any radial direction in cable insulation
Pulse field strength e at the r of positionp(t, r) distribution can be expressed as：
A and b is respectively the internal diameter and outside diameter of cable insulation in formula, and direction of the pulse field strength along internal diameter to outside diameter reduces,
Take at outside diameter b that as reference, then the pulse field strength penalty coefficient at r is r/b to field strength；
Step 2：Obtain sound wave density compensation factor：In sample of cable, due to the influence of its coaxial columnar structure, sound wave
Signal density is not equally distributed when propagating from inside to outside, the sound wave p at radial position r on unit area in a insulating layer
(t, r) intensity distribution can be expressed as：
In formulaω is the angular frequency of sound wave, and A is cable insulation material for constant, μ determined by boundary condition
Density, direction of the sound wave density along internal diameter to outside diameter reduce, then density compensation factor when the acoustic signals at r are detected
For
Step 3：Measuring signal geometrical factor amendment：Density exists during due to driving pulse field strength and sound wave radial propagation
The non-uniform Distribution of the layer diverse location of cable insulation radially, the pressure wave that driving pulse electric field is formed with charge interaction
It is not only related to charge density, it is same but also related to its Charge sites, for full-scale sample of cable, at the r that measures
It is (r/b) that space charge signal, which should be multiplied by geometrical factor correction factor,1/2To compensate due to space charge the present position in insulation
Difference in the measuring signal brought.
This method is suitable for processing of the large scale coaxial cable test specimens with the signal of pulse radio-acoustic method space charge measurement
Process, quantitative scoring count stating the correction factor of each geometrical factor in, geometrical factor amendment are carried out to space charge measurement signal, to disappear
Except the influence brought due to being tested the coaxial columnar structure of sample of cable to space charge measurement signal, so as to obtain high-precision
Space charge measurement result.
Brief description of the drawings
Fig. 1 is driving pulse field strength and sound wave density decay schematic diagram in coaxial columnar structure；
Fig. 2 is the FB(flow block) that geometry influences measuring signal modification method.
Embodiment
The present invention is related in the involved space charge measurement based on large scale coaxial cable insulation cable because several with reference to attached drawing
The makeover process what structure influences measuring signal illustrates.
As shown in Fig. 2, test is divided into three big steps；
Step 11, according to coaxial cable geometry, the penalty coefficient of the driving pulse field strength in cable insulation at r is determined
R/b, obtains revised driving pulse field strength；
Step 12, according to coaxial cable geometry, the penalty coefficient of the sound wave density in cable insulation at r is determinedObtain revised sound wave density；
Step 13, according to the penalty coefficient of driving pulse field strength and sound wave density, the space electricity at r in cable insulation is determined
The correction factor (r/b) of lotus signal1/2, obtain influences revised space charge measurement signal to coaxial cable geometry.
Concrete analysis is as follows：
1. driving pulse field strength compensates
Pulse voltage v is applied to sample of cablep(t), due to the coaxial columnar structure of cable so that impulse electric field is in cable
It is not equally distributed in insulating layer, the pulse field strength e in cable insulation at any radial position rp(t, r) distribution can be with table
It is shown as：
As shown in Figure 1, abscissa represents the radial position of sample of cable, ordinate represents pulse field strength, and a and b are respectively
The internal diameter and outside diameter of cable insulation, direction of the pulse field strength along internal diameter to outside diameter reduces it can be seen from field strength distribution formula,
The principle of pulse radio-acoustic method space charge measurement is the acoustic signals that the effect based on detection pulse field strength and space charge produces,
Therefore in full-scale sample of cable, due to the radial distribution feature of pulse field strength, identical charges density is in different radial positions
The acoustic signals intensity of upper generation is different, therefore in full-scale sample of cable, the acoustic signals detected depend not only on sky
Between charge density, additionally depend on its position in cable insulation, therefore needed in the processing procedure of space charge measurement signal
It is compensated, taking at outside diameter b pulsed field, then the pulse field strength penalty coefficient at r is r/b by force as reference；
2. intensity of acoustic wave compensates
Due to the structure of coaxial columnar cable, intensity of acoustic wave, can be right in the non-uniform Distribution in the radial direction of cable insulation
Input signal at last piezoelectric transducer has an impact.As shown in Figure 1, it is assumed that the distribution of space charge in cable insulation only exists
It radially changes, then the acoustic signals for containing space charge information are just only determined by its radial position, sound wave letter
Number it is represented by under cylindrical coordinate
In formulaFor the velocity potential function vibrated in medium, usaFor the spread speed of sound wave；The solution of the equation is
Pressure wave p (t, r) at r on unit area is
In formulaω is the angular frequency of sound wave, and A is Media density for constant, μ determined by boundary condition；
The pressure formed due to non-uniform Distribution of the close intensity of sound wave in cable insulation radially, pulse with charge interaction
Reeb is not only related to charge density, equally related to its Charge sites, and the acoustic signals p (t, r) produced at r is radially propagated
Acoustic wave signal decays to external electrode b into piezoelectric transducer are p (t+ Δs t, b), are had
Its sound wave density have passed through attenuation process when then the generation acoustic signals at r are detected at external electrode b, reply
The signal detected is multiplied by penalty coefficient
3. measuring signal geometrical factor amendment
The influence of comprehensive foregoing two kinds of cable geometry factors, since pulse field strength and sound wave density are in cable insulation
Non-uniform Distribution radially, pulse and the pressure wave that charge interaction is formed are not only related with charge density, equally and its
Charge sites are related, and for full-scale sample of cable, space charge signal should be multiplied by geometrical factor amendment system at the r that measures
Number (r/b)1/2To compensate the error in the measuring signal that present position is brought in insulation due to space charge.
The above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (1)
- A kind of 1. modification method of large scale coaxial cable insulation cable space charge measurement, it is characterised in that the modification method bag Include following steps：Step 1, obtains driving pulse field strength penalty coefficient；Driving pulse voltage v is applied to sample of cablep(t), it is exhausted to set cable Pulse field strength in edge at any radial position r is distributed as ep(t, r), sets the pulse field strength penalty coefficient at r as r/b；Step 2, obtains the close intensity compensation coefficient of sound wave；Sound wave point in cable insulation at any radial position r on unit area Cloth is p (t, r), set penalty coefficient when the acoustic signals at r are detected asStep 3, measuring signal geometrical factor amendment；Geometrical factor correction factor is set as (r/b)1/2, at actually measured r Space charge signal, it is (r/b) to be multiplied by the geometrical factor correction factor1/2, the space charge measurement letter after finally being compensated Number；Due to the coaxial columnar structure of cable so that driving pulse electric field is not equally distributed, institute in cable insulation State the pulse field strength e at any radial position rp(t, r) distribution is expressed as：<mrow> <msub> <mi>e</mi> <mi>p</mi> </msub> <mrow> <mo>(</mo> <mi>t</mi> <mo>,</mo> <mi>r</mi> <mo>)</mo> </mrow> <mo>=</mo> <mfrac> <mrow> <msub> <mi>v</mi> <mi>p</mi> </msub> <mrow> <mo>(</mo> <mi>t</mi> <mo>)</mo> </mrow> </mrow> <mrow> <mi>r</mi> <mi>ln</mi> <mrow> <mo>(</mo> <mi>b</mi> <mo>/</mo> <mi>a</mi> <mo>)</mo> </mrow> </mrow> </mfrac> </mrow>A and b is respectively the internal diameter and outside diameter of cable insulation in formula, and direction of the pulse field strength along internal diameter to outside diameter reduces, and takes outer As reference, then the pulse field strength penalty coefficient at r is r/b to field strength at the b of footpath；In sample of cable, due to the influence of its coaxial columnar structure, acoustic signals its intensity when along insulating layer radial propagation exists It is not equally distributed in insulating layer, sound wave p (t, the r) distributions at radial position r on unit area are expressed as：In formulaω is the angular frequency of sound wave, and A is the constant determined by boundary condition, and μ is the close of cable insulation material Degree, direction of the sound wave density along internal diameter to outside diameter reduce, and penalty coefficient is when the acoustic signals at r are detectedDue to the non-uniform Distribution of driving pulse field strength and the close intensity of sound wave in cable insulation radially, driving pulse electric field pressure The pressure wave to be formed that interacts to space charge is not only related with charge density, equally related to its electric charge position, right For full large scale coaxial cable test specimens, space charge signal is multiplied by geometrical factor correction factor (r/b) at the r that measures1/2Come Error in the compensation measuring signal result that present position is brought in insulation due to space charge.
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| US11054457B2 (en) | 2017-05-24 | 2021-07-06 | Cisco Technology, Inc. | Safety monitoring for cables transmitting data and power |
| US10809134B2 (en) | 2017-05-24 | 2020-10-20 | Cisco Technology, Inc. | Thermal modeling for cables transmitting data and power |
| CN113158383B (en) * | 2021-02-24 | 2022-10-28 | 西安交通大学 | Method for evaluating actual field intensity of direct-current cable joint by using coaxial simplified model |
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| CN1218555A (en) * | 1996-03-15 | 1999-06-02 | Abb研究有限公司 | Method and apparatus for space-charge measurement in cables using pulsed electroacoustic method |
| CN103543339A (en) * | 2013-10-31 | 2014-01-29 | 国家电网公司 | Method and device for analyzing alternating current-and-direct current space charge test data of dielectric sample |
| CN103592529A (en) * | 2013-09-11 | 2014-02-19 | 天津学子电力设备科技有限公司 | Method for evaluating insulation aging of XLPE (cross linked polyethylene) cable based on low-temperature pulse |
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| JP2006329859A (en) * | 2005-05-27 | 2006-12-07 | Hugle Electronics Inc | Ion control sensor |
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| CN1218555A (en) * | 1996-03-15 | 1999-06-02 | Abb研究有限公司 | Method and apparatus for space-charge measurement in cables using pulsed electroacoustic method |
| EP1007985A1 (en) * | 1996-03-15 | 2000-06-14 | ABB Research Ltd. | A method and a device for space-charge measurement in cables using a pulsed electroacoustic method |
| CN103592529A (en) * | 2013-09-11 | 2014-02-19 | 天津学子电力设备科技有限公司 | Method for evaluating insulation aging of XLPE (cross linked polyethylene) cable based on low-temperature pulse |
| CN103543339A (en) * | 2013-10-31 | 2014-01-29 | 国家电网公司 | Method and device for analyzing alternating current-and-direct current space charge test data of dielectric sample |
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| Space charge measurement in polymer insulated power cables using fiat ground electrode PEA system;M.Fu,G.Chen;《IEE Proc.-SciMeas.Technol》;20030331;第150卷(第2期);第91页第3.2.2小节 * |
| 塑料绝缘直流高压电缆中空间电荷测量技术的研究;吴琼,朱永华,顾金,王俏华,尹毅;《电线电缆》;20110625;第54卷(第3期);23页左栏第16行-右栏倒数第15行 * |
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Effective date of registration: 20210601 Address after: 510670 3rd, 4th and 5th floors of building J1 and 3rd floor of building J3, No.11 Kexiang Road, Science City, Luogang District, Guangzhou City, Guangdong Province Patentee after: China Southern Power Grid Research Institute Co.,Ltd. Address before: 510080 West Tower 13-20 Floor, Shui Jungang 6 and 8 Dongfeng East Road, Yuexiu District, Guangzhou City, Guangdong Province Patentee before: China Southern Power Grid Research Institute Co.,Ltd. Patentee before: CSG POWER GRID TECHNOLOGY RESEARCH CENTER |