CN105259486A - Aging site rapid diagnosis method for 10 kV XLPE cable based on polarization current measurement - Google Patents
Aging site rapid diagnosis method for 10 kV XLPE cable based on polarization current measurement Download PDFInfo
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- CN105259486A CN105259486A CN201510788033.1A CN201510788033A CN105259486A CN 105259486 A CN105259486 A CN 105259486A CN 201510788033 A CN201510788033 A CN 201510788033A CN 105259486 A CN105259486 A CN 105259486A
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Abstract
The invention discloses an aging site rapid diagnosis method for a 10 kV XLPE cable based on the polarization current measurement. According to the technical scheme of the invention, the Harmon approximation algorithm is improved when the fitting parameter n of the relaxation current is larger than or equal to 0 and smaller than or equal to 0.3, or is larger than or equal to 1.2 and smaller than or equal to 2. In this way, the application range of the Harmon approximation algorithm is expanded and the measurement time of the polarization current is greatly shortened according to the frequency range of a dielectric loss factor tan Delta determined based on the field actual need. Moreover, based on the improved Harmon approximation algorithm, the dielectric loss factor tan Delta at a corresponding frequency can be quickly and intuitively obtained, so that the cable aging condition can be judged based on the value of the dielectric loss factor tan Delta at the corresponding frequency. Therefore, by adopting the aging site rapid diagnosis method for the 10 kV XLPE cable based on the polarization current measurement, the aging condition of a field cable can be rapidly diagnosed. At the same time, the method is wider in application range and can reflect the cable aging condition more accurately. The requirement of the field time measurement can be met.
Description
Technical field
The present invention relates to insulating material aging assessment field, more specifically, relate to a kind of utilize polarization current method at the scene rapid evaluation crosslinked polyethylene midium voltage cable insulation method.
Background technology
Crosslinked polyethylene (CrosslinkedPolyethylene, XLPE) cable, due to its excellent mechanical property and electric property, is widely used in transmission line of electricity.Cable insulation aging performance and residual life directly have influence on the stability of electric system, so development XLPE cable insulation diagnosis technology is significant for raising stability of power system.
The domestic and international isolation diagnostic method about cable has carried out large quantifier elimination at present, wherein PDC (PolarizationandDepolarizationCurrent, PDC) method is as the aging method of testing of a kind of effective detection electrical equipment, there is the advantages such as measuring circuit is simple, power supply capacity is little, Non-Destructive Testing, and the ageing information of equipment can be reflected from the aspect of agine mechaism deeply.
But the Measuring Time of current PDC method is generally thousands of second, even reaches ten thousand seconds levels, be not suitable for field diagnostic cable status.And classical Harmon approximate data is only just suitable for when lax electric current fitting parameter n is positioned at 0.3<n<1.2, and the lax electric current fitting n value of actual motion cable within the scope of this, may not have limitation.
Summary of the invention
For above defect or the Improvement requirement of prior art, the invention provides a kind of aging on-the-spot fast diagnosis method of 10kVXLPE cable measured based on polarization current, its object is to the Measuring Time shortening polarization current according to the frequency range of the dielectric dissipation factor tan δ of on-the-spot actual needs, and convert polarization current quicklook to dielectric dissipation factor tan δ under respective frequencies by the Harmon approximate data improved, to judge the insulation status of cable according to the size of the dielectric dissipation factor tan δ under required frequency, be intended to solve in prior art because polarization current Measuring Time is long, the process that polarization current converts dielectric dissipation factor tan δ under respective frequencies to is complicated, PDC method is caused to be difficult to carry out cable at the scene the technical matters of quick diagnosis.
The invention provides a kind of aging on-the-spot fast diagnosis method of 10kVXLPE cable measured based on polarization current, comprise the steps:
(1) according to the frequency range determination polarization current Measuring Time of the dielectric dissipation factor tan δ of on-the-spot actual needs, and polarization current is measured in described polarization current Measuring Time;
(2) polarization current to be converted into the dielectric dissipation factor tan δ under respective frequencies by the Harmon approximate data by improving;
(3) cable aging performance is judged according to the size of the dielectric dissipation factor tan δ under respective frequencies.
Polarization current rapid translating by measuring the polarization current of short period, and according to the Harmon approximation theory improved, is the dielectric dissipation factor tan δ under respective frequencies by the present invention.The aging on-the-spot fast diagnosis method of 10kVXLPE cable measured based on polarization current provided by the invention, range of application is wider, and can greatly shorten polarization current Measuring Time, can carry out quick diagnosis at the scene to cable.Accurately can reflect the ageing state of cable, the requirement of in-site measurement time can be met again.
Further, it is characterized in that, the method for the frequency range determination polarization current Measuring Time according to the dielectric dissipation factor tan δ of on-the-spot actual needs described in step (1) is:
If polarization current Measuring Time is T, the sample frequency of current measurement module is f
sam, then the scope that can obtain the frequency f of dielectric dissipation factor tan δ is in theory:
According to the frequency range determination polarization current Measuring Time T of the dielectric dissipation factor tan δ of on-the-spot actual needs.
Further, it is characterized in that, the pass between the dielectric dissipation factor tan δ under polarization current described in step (2) and respective frequencies is:
As 0.3<n<1.2, the corresponding relation of the frequency f of polarization current moment point t and dielectric dissipation factor tan δ is: t=0.1/f, and the pass of time domain polarization current and frequency domain dielectric dissipation factor tan δ is:
When 0<n≤0.3 or 1.2≤n<2, the corresponding relation of the frequency f of polarization current moment point t and dielectric dissipation factor tan δ is: t=A/2 π f; The pass of time domain polarization current and frequency domain dielectric dissipation factor tan δ is:
Wherein, n is lax electric current fitting parameter, and f is the frequency of dielectric dissipation factor tan δ, i (t) for flowing through the total current of cable, C
0for the body capacitance of cable, U is the amplitude to the step wave voltage that sample applies,
In the present invention, according to the Harmon approximation theory improved, time domain polarization current is converted to the dielectric dissipation factor tan δ under respective frequencies, polarization current quicklook can be converted to dielectric dissipation factor tan δ under respective frequencies, and compare classical Harmon approximate data, its scope of application is wider.Electric current will be relaxed through experimental formula Φ (t)=β C
0t
-n(C
0for dielectric body capacitance, β and n is fitting parameter) carry out matching, the polarization current under any time can be converted to dielectric loss under respective frequencies because of tan δ according to the value of fitting parameter n.Intuitively the polarization current under any time can be converted to the dielectric dissipation factor tan δ under respective frequencies according to the Harmon approximate data improved.
Further, in step (3), the pass between the size of dielectric dissipation factor tan δ and cable aging performance is: described dielectric dissipation factor tan δ is larger, and cable degree of aging is more serious.
The present invention, by shortening polarization current Measuring Time, can carry out quick diagnosis to cable at the scene, accurately can reflect the ageing state of cable, can meet again the requirement of in-site measurement time.The frequency range of the dielectric dissipation factor tan δ chosen needed for on-the-spot reality, shorten polarization current Measuring Time, according to the Harmon approximation theory improved, be the medium consumption factor tan δ under respective frequencies by polarization current rapid translating, the state of insulation of assessment XLPE cable.The frequency range of the dielectric dissipation factor tan δ that polarization current Measuring Time is chosen needed for on-the-spot reality determines.If the dielectric dissipation factor tan δ choosing higher-frequency judges cable situation, then Measuring Time can shorten.If polarization current Measuring Time is T, the sample frequency of current measurement module is f
sam, then the scope that can obtain the frequency f of dielectric dissipation factor tan δ is in theory:
therefore Measuring Time is shorter, and the frequency range of the selectable dielectric dissipation factor tan δ as cable Ageing Diagnosis criterion is less.According to the frequency range of the dielectric dissipation factor tan δ of on-the-spot actual needs, polarization current Measuring Time can be shortened.
Meanwhile, the present invention is by arranging DC high-voltage power supply, cable sample, a current measurement module and anti-leak ring.The high-voltage output end of DC high-voltage power supply is connected with the conductor thread core of cable sample, creates polarization current.Two ends anti-leak ring is interconnected and makes directly to flow back to mains side along face leakage current without current measurement module, avoids the impact of measuring polarization current along face leakage current.Current measurement module measures polarization current.
Therefore, the aging on-the-spot fast diagnosis method of 10kVXLPE cable measured based on polarization current provided by the invention, by improving the Harmon approximate data when lax electric current fitting parameter n is positioned at 0<n≤0.3 or 1.2≤n<2, extend the range of application of Harmon approximate data, and can greatly shorten polarization current Measuring Time according to the frequency range of the dielectric dissipation factor tan δ of on-the-spot actual needs, and obtain dielectric dissipation factor tan δ under respective frequencies by the Harmon approximate data quicklook that improves, thus judge cable aging performance according to the size of dielectric dissipation factor tan δ under respective frequencies.Thus the invention provides, a kind of based on polarization current measure the aging on-the-spot fast diagnosis method of 10kVXLPE cable can carry out quick diagnosis to cable ageing state at the scene, and range of application is wider, accurately can reflect the ageing state of cable, can meet again the requirement of in-site measurement time.
Accompanying drawing explanation
Fig. 1 is the polarization current instrumentation plan of the twisted polyethylene cable that the embodiment of the present invention provides;
Fig. 2 is the realization flow figure of the aging on-the-spot fast diagnosis method of 10kVXLPE cable based on polarization current measurement that the embodiment of the present invention provides;
Fig. 3 is the polarization current figure of the different degree of aging cables that the embodiment of the present invention provides;
Fig. 4 is the dielectric dissipation factor tan δ frequency spectrum of the different degree of aging twisted polyethylene cable samples that the embodiment of the present invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.In addition, if below in described each embodiment of the present invention involved technical characteristic do not form conflict each other and just can mutually combine.
The invention provides a kind of aging on-the-spot fast diagnosis method of 10kVXLPE cable measured based on polarization current, basis is approximately with classical Harmon, Harmon approximate data when being positioned at 0<n≤0.3 or 1.2≤n<2 to fitting parameter n is improved, and expands the scope of application of Harmon approximate data.On this basis, polarization current Measuring Time can be shortened according to the frequency range of the dielectric dissipation factor tan δ of on-the-spot actual needs, measure polarization current, and the dielectric dissipation factor tan δ by the Harmon approximate data improved polarization current is converted under respective frequencies, to judge cable aging performance.
Therefore, a kind of aging on-the-spot fast diagnosis method of 10kVXLPE cable measured based on polarization current provided by the invention, improve the Harmon approximate data when lax electric current fitting parameter n is positioned at 0<n≤0.3 or 1.2≤n<2, extend the range of application of Harmon approximate data, and can greatly shorten polarization current Measuring Time according to the frequency range of the dielectric dissipation factor tan δ of on-the-spot actual needs, and obtain dielectric dissipation factor tan δ under respective frequencies by the Harmon approximate data quicklook that improves, thus judge cable aging performance according to the size of dielectric dissipation factor tan δ under respective frequencies.
Thus a kind of aging on-the-spot fast diagnosis method of 10kVXLPE cable measured based on polarization current provided by the invention can carry out quick diagnosis to cable ageing state at the scene, and range of application is wider, accurately can reflect the ageing state of cable, the requirement of in-site measurement time can be met again.
From classical Harmon approximation theory, the electric current that will relax is through experimental formula Φ (t)=β C
0t
-n(C
0for dielectric body capacitance, β and n is fitting parameter) carry out matching, the polarization current under any time can be converted to the tan δ under respective frequencies according to the value of fitting parameter n.Wherein, as 0.3<n<1.2, polarization current moment point t and angular frequency have following relation:
Then the corresponding relation of the frequency f of polarization current moment point t and dielectric dissipation factor tan δ is:
The pass of time domain polarization current and frequency domain dielectric dissipation factor tan δ is:
Classical Harmon approximate data is only just suitable for when lax electric current fitting parameter n is positioned at 0.3<n<1.2, and the lax electric current fitting n value of actual motion cable within the scope of this, may not have obvious limitation.The present invention, on classical Harmon approximate basic, improves the Harmon approximate data when lax electric current fitting parameter is positioned at 0<n≤0.3 or 1.2≤n<2.Namely as 0<n≤0.3 or 1.2≤n<2, if 0.63 will be taken as by A, then comparatively big error can be caused.Now, desirable actual A value, calculation medium loss factor tan δ, then the corresponding relation of the frequency f of polarization current moment point t and dielectric dissipation factor tan δ is:
The pass of t=A/2 π f (9) time domain polarization current and frequency domain dielectric dissipation factor tan δ is:
Therefore, intuitively the polarization current under any time can be converted to the tan δ under respective frequencies according to the Harmon approximate data improved.
The frequency range of the dielectric dissipation factor tan δ that polarization current Measuring Time is chosen needed for on-the-spot reality determines.If the dielectric dissipation factor tan δ choosing higher-frequency judges cable situation, then Measuring Time can shorten greatly.If polarization current Measuring Time is T, the sample frequency of current measurement module is f
sam, then the scope of the frequency f of available dielectric dissipation factor tan δ is in theory:
Measuring Time is shorter, and the frequency range of the selectable dielectric dissipation factor tan δ as cable Ageing Diagnosis criterion is less.Therefore, according to the frequency range of the dielectric dissipation factor tan δ of on-the-spot actual needs, polarization current Measuring Time can be shortened,
Adopt the polarization current measuring principle circuit measuring cable polarization current shown in Fig. 1.The high-voltage output end of DC high-voltage power supply is connected with the conductor thread core of cable sample, produces polarization current.Two ends anti-leak ring is interconnected and makes directly to flow back to mains side along face leakage current without current measurement module, avoids the impact of measuring polarization current along face leakage current.Current measurement module measures polarization current.
Therefore, a kind of aging on-the-spot fast diagnosis method of 10kVXLPE cable measured based on polarization current provided by the invention, improve the Harmon approximate data when lax electric current fitting parameter n is positioned at 0<n≤0.3 or 1.2≤n<2, extend the range of application of Harmon approximate data, and can greatly shorten polarization current Measuring Time according to the frequency range of the dielectric dissipation factor tan δ of on-the-spot actual needs, and obtain dielectric dissipation factor tan δ under respective frequencies by the Harmon approximate data quicklook that improves, thus judge cable aging performance according to the size of dielectric dissipation factor tan δ under respective frequencies.Thus a kind of aging on-the-spot fast diagnosis method of 10kVXLPE cable measured based on polarization current provided by the invention can carry out quick diagnosis to cable ageing state at the scene, and range of application is wider, accurately can reflect the ageing state of cable, the requirement of in-site measurement time can be met again.
The aging on-the-spot fast diagnosis method of 10kVXLPE cable measured based on polarization current provided by the invention, implementation step comprises: according to the frequency range determination polarization current Measuring Time of the dielectric dissipation factor tan δ of on-the-spot actual needs, measure polarization current, by the Harmon approximate data improved polarization current is converted into the dielectric dissipation factor tan δ under respective frequencies, and judges cable aging performance according to the size of dielectric dissipation factor tan δ under respective frequencies.This method can carry out quick diagnosis to cable at the scene, accurately can reflect the ageing state of cable, can meet again the requirement of in-site measurement time.
If polarization current Measuring Time is T, the sample frequency of current measurement module is f
sam, then the scope of the frequency f of available dielectric dissipation factor tan δ is in theory:
Therefore, Measuring Time is shorter, and the optional frequency range be taken as the dielectric dissipation factor tan δ of cable Ageing Diagnosis criterion is less.According to the frequency range of the dielectric dissipation factor tan δ of on-the-spot actual needs, polarization current Measuring Time can be shortened.
In embodiments of the present invention, Fig. 1 shows the schematic diagram aging cable sample of difference being carried out to polarization current measurement; The high-voltage output end of DC high-voltage power supply is connected with the conductor thread core of cable sample, creates polarization current.Two ends anti-leak ring is interconnected and makes directly to flow back to mains side along face leakage current without current measurement module, avoids the impact of measuring polarization current along face leakage current.Current measurement module measures polarization current.
In embodiments of the present invention, Fig. 2 shows the realization flow figure of the aging on-the-spot fast diagnosis method of 10kVXLPE cable based on polarization current measurement provided by the invention.
In embodiments of the present invention, Fig. 3 shows the schematic diagram of the polarization current of different degree of aging cable; The actual degree of aging of cable: P1<P2.As shown in Figure 3 along with the increase of cable degree of aging, polarization current obviously increases, and curve upwards offsets along with the increase entirety of degree of aging.
In embodiments of the present invention, the frequency domain loss factor being different degree of aging cable sample as Fig. 4 is composed.The lax electric current of cable is isolated, by experimental formula Φ (t)=β C from the polarization current of Fig. 3
0t
-n(C
0for dielectric body capacitance, β and n is fitting parameter) carry out matching, the polarization current under any time can be converted to the tan δ under respective frequencies according to the value of fitting parameter n.
Wherein, as 0.3<n<1.2, the corresponding relation of the frequency f of polarization current moment point t and dielectric dissipation factor tan δ is: t=0.1/f, and the pass of time domain polarization current and frequency domain dielectric dissipation factor tan δ is:
when 0<n≤0.3 or 1.2≤n<2, the corresponding relation of the frequency f of polarization current moment point t and dielectric dissipation factor tan δ is: t=A/2 π f, and the pass of time domain polarization current and frequency domain dielectric dissipation factor tan δ is:
therefore, intuitively the polarization current under any time can be converted to the dielectric dissipation factor tan δ under respective frequencies according to the Harmon approximate data improved, thus cable aging performance can be judged according to the size of dielectric dissipation factor tan δ under respective frequencies.As can be seen from Figure 4, along with the increase of cable degree of aging, the integrated curved of loss factor spectrum obviously rises, and the loss factor spectrum therefore obtained by the Harmon approximate data improved can be used for characterizing the degree of aging of twisted polyethylene cable.
A kind of aging on-the-spot fast diagnosis method of 10kVXLPE cable measured based on polarization current that example of the present invention provides, improve the Harmon approximate data when lax electric current fitting parameter n is positioned at 0<n≤0.3 or 1.2≤n<2, extend the range of application of Harmon approximate data, and can greatly shorten polarization current Measuring Time according to the frequency range of the dielectric dissipation factor tan δ of on-the-spot actual needs, and obtain dielectric dissipation factor tan δ under respective frequencies by the Harmon approximate data quicklook that improves, thus judge cable aging performance according to the size of dielectric dissipation factor tan δ under respective frequencies.Thus a kind of aging on-the-spot fast diagnosis method of 10kVXLPE cable measured based on polarization current provided by the invention can carry out quick diagnosis to cable ageing state at the scene, and range of application is wider, accurately can reflect the ageing state of cable, the requirement of in-site measurement time can be met again.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1., based on the aging on-the-spot fast diagnosis method of 10kVXLPE cable that polarization current is measured, it is characterized in that, comprise the steps:
(1) according to the frequency range determination polarization current Measuring Time of the dielectric dissipation factor tan δ of on-the-spot actual needs, and polarization current is measured in described polarization current Measuring Time;
(2) polarization current to be converted into the dielectric dissipation factor tan δ under respective frequencies by the Harmon approximate data by improving;
(3) cable aging performance is judged according to the size of the dielectric dissipation factor tan δ under respective frequencies.
2. the aging on-the-spot fast diagnosis method of cable as claimed in claim 1, is characterized in that, the pass between the dielectric dissipation factor tan δ under polarization current described in step (2) and respective frequencies is:
As 0.3<n<1.2, the corresponding relation of the frequency f of polarization current moment point t and dielectric dissipation factor tan δ is: t=0.1/f, and the pass of time domain polarization current and frequency domain dielectric dissipation factor tan δ is:
When 0<n≤0.3 or 1.2≤n<2, the corresponding relation of the frequency f of polarization current moment point t and dielectric dissipation factor tan δ is: t=A/2 π f; The pass of time domain polarization current and frequency domain dielectric dissipation factor tan δ is:
Wherein, n is lax electric current fitting parameter, and f is the frequency of dielectric dissipation factor tan δ, i (t) for flowing through the total current of cable, C
0for the body capacitance of cable, U is the amplitude to the step wave voltage that sample applies,
3. the aging fast diagnosis method of cable as claimed in claim 1, it is characterized in that, in step (1), the method according to the frequency range determination polarization current Measuring Time of the dielectric dissipation factor tan δ of on-the-spot actual needs is:
If polarization current Measuring Time is T, the sample frequency of current measurement module is f
sam, then the scope that can obtain the frequency f of dielectric dissipation factor tan δ is in theory:
According to the frequency range determination polarization current Measuring Time T of the dielectric dissipation factor tan δ of on-the-spot actual needs.
4. the aging on-the-spot fast diagnosis method of cable as claimed in claim 1 or 2, it is characterized in that, in step (3), the pass between the size of dielectric dissipation factor tan δ and cable aging performance is: described dielectric dissipation factor tan δ is larger, and cable degree of aging is more serious.
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| CN108051712A (en) * | 2017-12-14 | 2018-05-18 | 四川大学 | 10kV XLPE power cable insulations aging assessments and system |
| CN109374980A (en) * | 2018-08-24 | 2019-02-22 | 国网天津市电力公司电力科学研究院 | A kind of stray electrical current suppressing method in split-phase power cable dielectric |
| CN110618364A (en) * | 2019-11-03 | 2019-12-27 | 西南交通大学 | Method for evaluating insulation reliability of XLPE cable terminal of power distribution network |
| CN111025096A (en) * | 2019-11-19 | 2020-04-17 | 云南电网有限责任公司临沧供电局 | XLPE cable aging state evaluation method based on leakage current characteristic factor |
| CN111579879A (en) * | 2020-05-27 | 2020-08-25 | 哈尔滨理工大学 | Dielectric infinite high-frequency relative dielectric constant measuring principle based on polarization current and surface potential time domain spectrum |
| CN111736043A (en) * | 2020-06-19 | 2020-10-02 | 西安交通大学 | XLPE cable degassing state evaluation method based on low-frequency dielectric spectrum |
| CN111913046A (en) * | 2020-05-27 | 2020-11-10 | 哈尔滨理工大学 | Principle for measuring steady-state relaxation polarizability of insulating dielectric medium based on polarization current time domain spectrum |
| CN113138325A (en) * | 2021-04-14 | 2021-07-20 | 长江大学 | Rapid diagnosis method for decoupling insulation low-frequency dielectric loss of crosslinked polyethylene cable |
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| CN105866647A (en) * | 2016-06-08 | 2016-08-17 | 西安交通大学 | XLPE insulation aging state evaluation method based on different frequency dielectric loss ratios |
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| CN109374980A (en) * | 2018-08-24 | 2019-02-22 | 国网天津市电力公司电力科学研究院 | A kind of stray electrical current suppressing method in split-phase power cable dielectric |
| CN110618364A (en) * | 2019-11-03 | 2019-12-27 | 西南交通大学 | Method for evaluating insulation reliability of XLPE cable terminal of power distribution network |
| CN111025096A (en) * | 2019-11-19 | 2020-04-17 | 云南电网有限责任公司临沧供电局 | XLPE cable aging state evaluation method based on leakage current characteristic factor |
| CN111025096B (en) * | 2019-11-19 | 2021-08-10 | 云南电网有限责任公司临沧供电局 | XLPE cable aging state evaluation method based on leakage current characteristic factor |
| CN111579879A (en) * | 2020-05-27 | 2020-08-25 | 哈尔滨理工大学 | Dielectric infinite high-frequency relative dielectric constant measuring principle based on polarization current and surface potential time domain spectrum |
| CN111913046A (en) * | 2020-05-27 | 2020-11-10 | 哈尔滨理工大学 | Principle for measuring steady-state relaxation polarizability of insulating dielectric medium based on polarization current time domain spectrum |
| CN111736043A (en) * | 2020-06-19 | 2020-10-02 | 西安交通大学 | XLPE cable degassing state evaluation method based on low-frequency dielectric spectrum |
| CN113138325A (en) * | 2021-04-14 | 2021-07-20 | 长江大学 | Rapid diagnosis method for decoupling insulation low-frequency dielectric loss of crosslinked polyethylene cable |
| CN113138325B (en) * | 2021-04-14 | 2022-08-19 | 长江大学 | Rapid diagnosis method for loss decoupling of insulating low-frequency medium of crosslinked polyethylene cable |
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