CN102004211A - Method for detecting insulation defect of high-voltage cable accessory - Google Patents
Method for detecting insulation defect of high-voltage cable accessory Download PDFInfo
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- CN102004211A CN102004211A CN2009101948072A CN200910194807A CN102004211A CN 102004211 A CN102004211 A CN 102004211A CN 2009101948072 A CN2009101948072 A CN 2009101948072A CN 200910194807 A CN200910194807 A CN 200910194807A CN 102004211 A CN102004211 A CN 102004211A
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- 238000009413 insulation Methods 0.000 title claims abstract description 43
- 230000007547 defect Effects 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 8
- 239000000284 extract Substances 0.000 claims abstract description 5
- 238000004891 communication Methods 0.000 claims abstract description 4
- 238000001514 detection method Methods 0.000 claims description 18
- 230000002950 deficient Effects 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 239000004065 semiconductor Substances 0.000 claims description 3
- 230000003321 amplification Effects 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- 230000002708 enhancing effect Effects 0.000 abstract 1
- 229920003020 cross-linked polyethylene Polymers 0.000 description 3
- 239000004703 cross-linked polyethylene Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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- 230000005684 electric field Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The invention relates to a method for detecting the insulation defect of a high-voltage cable accessory. In the method, hardware comprises a local discharge signal sensor, a local discharge signal acquisition unit and an industrial control computer, wherein the local discharge signal acquisition unit conditions and amplifies a signal acquired from a cable joint by the local discharge signal sensor, extracts a power frequency voltage signal and a local discharge signal and transmits the power frequency voltage signal and the local discharge signal to the industrial control computer through a universal serial bus (USB) communication interface; and the industrial control computer forms a local discharge spectrogram with reference to a power frequency voltage phase to obtain a characteristic parameter of the discharge spectrogram, compares the characteristic parameter with an insulation defect database and detects the existence of the insulation defect in the cable joint and the type of the defect. Compared with the prior art, the method has the advantages of preventing faults from occurring, enhancing the power supply reliability of a cable system and the like.
Description
Technical field
The present invention relates to a kind of detection method, relate in particular to a kind of HV cable accessories insulation defect detection method.
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
Purpose of the present invention is exactly in order to overcome the defective that above-mentioned prior art exists, a kind of HV cable accessories insulation defect detection method with strong points to be provided.
Purpose of the present invention can be achieved through the following technical solutions:
A kind of HV cable accessories insulation defect detection method, it is characterized in that, this method hardware comprises the local discharge signal sensor, the local discharge signal collecting unit, industrial computer, described local discharge signal collecting unit is nursed one's health amplification to the local discharge signal sensor from the signal that cable splice collects, extract power-frequency voltage signal and local discharge signal, power-frequency voltage signal and local discharge signal are sent to industrial computer by the usb communication interface, this industrial computer is reference with the power-frequency voltage phase place, form shelf depreciation discharge spectrogram, and then the characteristic parameter of the spectrogram that obtains discharging, and compare with the insulation defect database, whether the detection streamer joint exists the type of insulation defect and defective.
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.
Described insulation defect database comprises five class insulation defects, is respectively semiconductor tip, joint displacement, low potential metal powder, major insulation retraction, insulation course air gap.
Compared with prior art, advantage of the present invention 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 process flow diagram of a kind of HV cable accessories insulation defect of the present invention detection method.
Embodiment
The present invention will be further described below in conjunction with specific embodiment.
As shown in Figure 1, a kind of HV cable accessories insulation defect detection method, the present invention is made of local discharge signal sensor, local discharge signal collecting unit and industrial computer.Sensor is installed in the cable intermediate joint or the joint side is coupled local discharge signal, the local discharge signal collecting unit is provided with the acquisition channel of local discharge signal and voltage signal, and it is sent in the industrial computer by the usb communication interface.Industrial computer is handled local discharge signal, and compares with various defect sample, detects and belongs 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
(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 (4)
1. HV cable accessories insulation defect detection method, it is characterized in that, this method hardware comprises the local discharge signal sensor, the local discharge signal collecting unit, industrial computer, described local discharge signal collecting unit is nursed one's health amplification to the local discharge signal sensor from the signal that cable splice collects, extract power-frequency voltage signal and local discharge signal, power-frequency voltage signal and local discharge signal are sent to industrial computer by the usb communication interface, this industrial computer is reference with the power-frequency voltage phase place, form shelf depreciation discharge spectrogram, and then the characteristic parameter of the spectrogram that obtains discharging, and compare with the insulation defect database, whether the detection streamer joint exists the type of insulation defect and defective.
2. a kind of HV cable accessories insulation defect detection method 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 insulation defect detection method 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.
4. a kind of HV cable accessories insulation defect detection method according to claim 1, it is characterized in that, described insulation defect database comprises five class insulation defects, is respectively semiconductor tip, joint displacement, low potential metal powder, major insulation retraction, insulation course air gap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2009101948072A CN102004211A (en) | 2009-08-28 | 2009-08-28 | Method for detecting insulation defect of high-voltage cable accessory |
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| CN2009101948072A CN102004211A (en) | 2009-08-28 | 2009-08-28 | Method for detecting insulation defect of high-voltage cable accessory |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102129017A (en) * | 2010-12-30 | 2011-07-20 | 杭州柯林电力设备有限公司 | Case-based intelligent local discharge fault identification system and identification method |
| CN102385026A (en) * | 2011-11-14 | 2012-03-21 | 国网电力科学研究院 | On-line positioning method and device for partial discharge of high-voltage cable line |
| 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 |
| CN103197218A (en) * | 2013-04-23 | 2013-07-10 | 国家电网公司 | High-voltage cable insulation defect partial discharge electrification detection diagnostic method |
| CN103901327A (en) * | 2014-03-17 | 2014-07-02 | 华南理工大学 | Detection method used for partial discharge of 10KV distribution network XLPE cable |
| CN104076244A (en) * | 2014-06-06 | 2014-10-01 | 西安电子科技大学 | Cable fault detection device based on industrial control board and FPGA |
| CN104849628A (en) * | 2015-04-24 | 2015-08-19 | 国网四川省电力公司电力科学研究院 | Fault analysis detection method for cable accessory |
| CN105044579A (en) * | 2015-06-05 | 2015-11-11 | 北京兴迪仪器有限责任公司 | Measurement method for distributed partial discharge |
| RU2604578C1 (en) * | 2015-05-20 | 2016-12-10 | Федеральное государственное бюджетное учреждение науки Институт автоматики и процессов управления Дальневосточного отделения Российской академии наук (ИАПУ ДВО РАН) | Method of high-voltage equipment technical condition monitoring |
| CN104237750B (en) * | 2014-09-05 | 2017-02-08 | 中国西电电气股份有限公司 | GIS insulation defect partial discharge fault graph drawing method |
| CN107271860A (en) * | 2017-06-09 | 2017-10-20 | 北京兴迪仪器有限责任公司 | Partial discharge pulse waveform similarity recognition method |
| 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 |
| CN109239550A (en) * | 2018-09-04 | 2019-01-18 | 国网山东省电力公司青岛供电公司 | A kind of line insulation situation judgment method |
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| CN1184940A (en) * | 1996-12-09 | 1998-06-17 | 株式会社日立制作所 | Insulated device diagnosing system and partial discharge detecting method |
| CN1580797A (en) * | 2004-05-17 | 2005-02-16 | 西安交通大学 | Power cable local discharge on-line monitoring method and device |
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2009
- 2009-08-28 CN CN2009101948072A patent/CN102004211A/en active Pending
Patent Citations (2)
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|---|---|---|---|---|
| CN1184940A (en) * | 1996-12-09 | 1998-06-17 | 株式会社日立制作所 | Insulated device diagnosing system and partial discharge detecting method |
| CN1580797A (en) * | 2004-05-17 | 2005-02-16 | 西安交通大学 | Power cable local discharge on-line monitoring method and device |
Non-Patent Citations (1)
| Title |
|---|
| 李长玉: "基于超高频法的XLPE电缆附件局部放电检测技术的研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102129017A (en) * | 2010-12-30 | 2011-07-20 | 杭州柯林电力设备有限公司 | Case-based intelligent local discharge fault identification system and identification method |
| CN102385026A (en) * | 2011-11-14 | 2012-03-21 | 国网电力科学研究院 | On-line positioning method and device for partial discharge of high-voltage cable line |
| 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 |
| CN103197218A (en) * | 2013-04-23 | 2013-07-10 | 国家电网公司 | High-voltage cable insulation defect partial discharge electrification detection diagnostic method |
| CN103197218B (en) * | 2013-04-23 | 2016-03-16 | 国家电网公司 | A kind of high-voltage cable insulation defect partial discharge electrification detection diagnostic method |
| CN103901327A (en) * | 2014-03-17 | 2014-07-02 | 华南理工大学 | Detection method used for partial discharge of 10KV distribution network XLPE cable |
| CN103901327B (en) * | 2014-03-17 | 2017-01-18 | 华南理工大学 | Detection method used for partial discharge of 10KV distribution network XLPE cable |
| CN104076244A (en) * | 2014-06-06 | 2014-10-01 | 西安电子科技大学 | Cable fault detection device based on industrial control board and FPGA |
| CN104237750B (en) * | 2014-09-05 | 2017-02-08 | 中国西电电气股份有限公司 | GIS insulation defect partial discharge fault graph drawing method |
| CN104849628A (en) * | 2015-04-24 | 2015-08-19 | 国网四川省电力公司电力科学研究院 | Fault analysis detection method for cable accessory |
| CN104849628B (en) * | 2015-04-24 | 2017-11-14 | 国网四川省电力公司电力科学研究院 | A kind of cable accessory accident analysis detection method |
| RU2604578C1 (en) * | 2015-05-20 | 2016-12-10 | Федеральное государственное бюджетное учреждение науки Институт автоматики и процессов управления Дальневосточного отделения Российской академии наук (ИАПУ ДВО РАН) | Method of high-voltage equipment technical condition monitoring |
| CN105044579A (en) * | 2015-06-05 | 2015-11-11 | 北京兴迪仪器有限责任公司 | Measurement method for distributed partial discharge |
| CN107271860A (en) * | 2017-06-09 | 2017-10-20 | 北京兴迪仪器有限责任公司 | Partial discharge pulse waveform similarity recognition method |
| CN107271860B (en) * | 2017-06-09 | 2019-09-24 | 北京兴迪仪器有限责任公司 | Partial discharge pulse waveform similarity recognition method |
| 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 |
| CN109239550A (en) * | 2018-09-04 | 2019-01-18 | 国网山东省电力公司青岛供电公司 | A kind of line insulation situation judgment method |
| CN109239550B (en) * | 2018-09-04 | 2020-11-27 | 国网山东省电力公司青岛供电公司 | Line insulation condition judgment method |
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Effective date of registration: 20121228 Address after: 200122 Shanghai City, Pudong New Area source deep road, No. 1122 Applicant after: Shanghai Electric Power Corporation Applicant after: State Grid Corporation of China Applicant after: SHANGHAI JIULONG ENTERPRISE MANAGEMENT CONSULTING CO., LTD. Address before: 200072 No. 2501, Gonghe Road, Shanghai Applicant before: Electric Cable Transmission and Distribution Co. of Shanghai Power Company Applicant before: Shanghai Zhongqu Electric Energy Saving Technology Co., Ltd. |
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Application publication date: 20110406 |