CN201477169U - Insulation defect detection device for high voltage cable accessory - Google Patents
Insulation defect detection device for high voltage cable accessory Download PDFInfo
- Publication number
- CN201477169U CN201477169U CN2009202086425U CN200920208642U CN201477169U CN 201477169 U CN201477169 U CN 201477169U CN 2009202086425 U CN2009202086425 U CN 2009202086425U CN 200920208642 U CN200920208642 U CN 200920208642U CN 201477169 U CN201477169 U CN 201477169U
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- discharge signal
- insulation defect
- local discharge
- cable
- insulation
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Abstract
The utility model relates to an insulation defect detection device for a high voltage cable accessory, the device comprises a partial discharge signal sensor, a partial discharge signal acquisition unit and an industrial control computer, wherein the partial discharge signal sensor is connected with the partial discharge signal acquisition unit, the partial discharge signal acquisition unit is connected with the industrial control computer, and the industrial control computer comprises an insulation defect database. Compared with the prior art, the insulation defect detection device has the advantages of preventing faults, improving the reliability of power supply of a cable system and the like.
Description
Technical field
The utility model relates to a kind of pick-up unit, relates in particular to a kind of HV cable accessories testing device for insulation defect.
Background technology
Along with high pressure and ultrahigh voltage power cable have obtained application more and more widely in electric system, how to realize the state-detection of these cable machineries, guarantee the cable machinery safe and reliable operation, be the focus of preceding domestic and international research.
In high-voltage and ultra-high crosslinked polyethylene (XLPE) the power cable system, cable accessory all is artificial fabrication and installation under the condition at the scene, and its insulation quality often is lower than the cable body dielectric level, be the weak link that insulate in the cable system.The various insulation defects of the bad formation of joint construction technology make joint internal electric field skewness, cause the generation of shelf depreciation.Under power-frequency voltage, shelf depreciation will cause generation and the expansion of electricity tree in the cable insulation, and quicken the deterioration of insulation, finally cause insulation breakdown.
Existing facts have proved, the partial discharge quantity of cable and its insulation status are closely related, and the variation of partial discharge quantity is indicating that may there be the defective that endangers cable running safety in cable insulation.The XLPE cable online detector for partial discharge of development is a lot of both at home and abroad at present, though can detect shelf depreciation, can not provide the insulation defect type that causes the shelf depreciation discharge, and this has brought uncertainty to the decision-making that cable machinery keeps in repair, changes.
Summary of the invention
The purpose of this utility model is exactly in order to overcome the defective that above-mentioned prior art exists, a kind of HV cable accessories testing device for insulation defect with strong points to be provided.
The purpose of this utility model can be achieved through the following technical solutions:
A kind of HV cable accessories testing device for insulation defect, it is characterized in that, this device comprises local discharge signal sensor, local discharge signal collecting unit, industrial computer, described local discharge signal sensor links to each other with the local discharge signal collecting unit, described local discharge signal collecting unit links to each other with industrial computer, and described industrial computer comprises the insulation defect database.
Described local discharge signal sensor is installed in the cable intermediate joint or the joint side.
Described local discharge signal collecting unit is provided with the acquisition channel of local discharge signal and voltage signal.
Compared with prior art, advantage of the present utility model is:
According to on-the-spot needs, online cable splice is carried out Partial Discharge Detection, the insulation situation is effectively detected, the detection and the identification of an insulation defect that achieves a butt joint, the generation of prevention cable machinery catastrophic discontinuityfailure improves the cable system power supply reliability.
Description of drawings
Fig. 1 is the structural representation of a kind of HV cable accessories testing device for insulation defect of the utility model.
Embodiment
Below in conjunction with specific embodiment the utility model is described further.
As shown in Figure 1, a kind of HV cable accessories testing device for insulation defect, the utility model is made of local discharge signal sensor 1, local discharge signal collecting unit 2 and industrial computer 3.Local discharge signal sensor 1 is installed in the cable intermediate joint or the joint side is coupled local discharge signal, local discharge signal collecting unit 2 is provided with the acquisition channel of local discharge signal and voltage signal, and it is sent in the industrial computer 3 by the usb communication interface, industrial computer 3 is handled local discharge signal, and compare with various defect sample, detect and belong to which kind of electric discharge type.
(1) insulation defect sample database
According to the grasp situation of on-the-spot high pressure, extra-high-tension cable intermediate head mounting process, summarize 5 class insulation defects of on-the-spot the easiest appearance: semiconductor tip, joint displacement, low potential metal powder, major insulation bounce back, the insulation course air gap.
In testing laboratory, by being set, above-mentioned defective comes the various insulation defects that occur in the dry run when cable splice is installed, and the cable system of the cable body of use and intermediate head and actual motion is in full accord.
(2) defective discharge chromatogram characteristic amount is extracted
Behind local discharge signal measuring unit extraction local discharge signal, on industrial computer, form Q-φ spectrogram (discharge capacity-discharge phase spectrogram), N-Q spectrogram (unit interval discharge time-discharge capacity spectrogram), N-φ spectrogram (unit interval discharge time-discharge phase spectrogram), N-Q-φ spectrogram (unit interval discharge time-discharge capacity-discharge phase spectrogram).
Extract the following Statistical Operator of discharge spectrogram:
(1) measure of skewness S
k=∑ [(x
i-μ)
3p
i]/σ
3
x
iBe the discharge capacity of each phase window, p
iBe that i phase window value is x
iProbability, μ is ∑ x
iP
iAverage, σ is a variance, σ
2=∑ (x
i-μ)
2P
i
(2) set-back K
u=∑ [(x
i-μ)
4p
i]/σ
4-3.
(3) peak value number Pe: the maximum value number of the spectrogram that promptly discharges.
(4) phase place degree of asymmetry
(5) discharge degree of asymmetry
Q
s +, Q
s -Be respectively the total discharge capacity of positive-negative half-cycle, N
+, N
-Be respectively positive-negative half-cycle discharge total degree.
(6) revise related coefficient
X is the positive half cycle phase window of a voltage discharge capacity, and y is the discharge capacity of negative half period corresponding phase window.
(3) detection of defect type
Extract the cable intermediate joint local discharge signal of on-the-spot operation, form discharge spectrograms such as Q-φ, N-Q, N-φ, N-Q-φ, calculate the Statistical Operator characteristic parameter of spectrogram then, above-mentioned characteristic quantity is carried out sample storehouse similarity to be calculated, whether detection tabs has insulation defect, and the type of insulation defect.The defect characteristic parameter of be sure oing can write the sample storehouse, increases sample total, improves the discriminant accuracy of follow-up rig-site utilization.
Claims (3)
1. HV cable accessories testing device for insulation defect, it is characterized in that, this device comprises local discharge signal sensor, local discharge signal collecting unit, industrial computer, described local discharge signal sensor links to each other with the local discharge signal collecting unit, described local discharge signal collecting unit links to each other with industrial computer, and described industrial computer comprises the insulation defect database.
2. a kind of HV cable accessories testing device for insulation defect according to claim 1 is characterized in that, described local discharge signal sensor is installed in the cable intermediate joint or the joint side.
3. a kind of HV cable accessories testing device for insulation defect according to claim 1 is characterized in that described local discharge signal collecting unit is provided with the acquisition channel of local discharge signal and voltage signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202086425U CN201477169U (en) | 2009-08-28 | 2009-08-28 | Insulation defect detection device for high voltage cable accessory |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202086425U CN201477169U (en) | 2009-08-28 | 2009-08-28 | Insulation defect detection device for high voltage cable accessory |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201477169U true CN201477169U (en) | 2010-05-19 |
Family
ID=42413422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202086425U Expired - Lifetime CN201477169U (en) | 2009-08-28 | 2009-08-28 | Insulation defect detection device for high voltage cable accessory |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201477169U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103197214A (en) * | 2013-04-08 | 2013-07-10 | 陶柏洪 | Prefabricated power cable accessory alternating current power frequency withstand voltage detection method and prefabricated power cable accessory alternating current power frequency withstand voltage detection device |
| CN105021957A (en) * | 2015-08-03 | 2015-11-04 | 西南石油大学 | Power cable accessory fault identification method and system |
| CN108072814A (en) * | 2017-11-23 | 2018-05-25 | 国网北京市电力公司 | cable monitoring method and system, storage medium, processor |
| CN109085468A (en) * | 2018-07-27 | 2018-12-25 | 上海交通大学 | A kind of recognition methods of cable local discharge insulation defect |
-
2009
- 2009-08-28 CN CN2009202086425U patent/CN201477169U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103197214A (en) * | 2013-04-08 | 2013-07-10 | 陶柏洪 | Prefabricated power cable accessory alternating current power frequency withstand voltage detection method and prefabricated power cable accessory alternating current power frequency withstand voltage detection device |
| CN103197214B (en) * | 2013-04-08 | 2015-03-11 | 陶柏洪 | Prefabricated power cable accessory alternating current power frequency withstand voltage detection method and prefabricated power cable accessory alternating current power frequency withstand voltage detection device |
| CN105021957A (en) * | 2015-08-03 | 2015-11-04 | 西南石油大学 | Power cable accessory fault identification method and system |
| CN105021957B (en) * | 2015-08-03 | 2018-07-06 | 西南石油大学 | A kind of electric cable fitting fault recognition method and system |
| CN108072814A (en) * | 2017-11-23 | 2018-05-25 | 国网北京市电力公司 | cable monitoring method and system, storage medium, processor |
| CN109085468A (en) * | 2018-07-27 | 2018-12-25 | 上海交通大学 | A kind of recognition methods of cable local discharge insulation defect |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100519 |
|
| CX01 | Expiry of patent term |