CN103076498A - Method of detecting conductivity of moist solid cable - Google Patents
Method of detecting conductivity of moist solid cable Download PDFInfo
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- CN103076498A CN103076498A CN2012105880812A CN201210588081A CN103076498A CN 103076498 A CN103076498 A CN 103076498A CN 2012105880812 A CN2012105880812 A CN 2012105880812A CN 201210588081 A CN201210588081 A CN 201210588081A CN 103076498 A CN103076498 A CN 103076498A
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- solid cable
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Abstract
The invention relates to a method of detecting conductivity of a moist solid cable. The method comprises the following steps of: 1) pretreating a solid cable to be detected so as to expose a main insulation layer on the surface of the solid cable as a to-be-measured section; 2) introducing direct current voltage on both ends of the to-be-measured section of the solid cable, and detecting leakage current of an along surface of the to-be-measured section; and 3) computing according to the leakage current of the along surface so as to obtain conductivity of the solid cable. According to the invention, in comparison with the prior art, the leakage current of the along surface of the to-be-measured section is detected by adopting an indirect measuring method, and conductivity of the moist solid cable is obtained according to the leakage current of the along surface, so that detection is quick and accurate.
Description
Technical field
The present invention relates to a kind of solid cable, especially relate to a kind of electric conductivity detection method of moist solids cable.
Background technology
Along with the expansion of electrical network scale and the increase of line voltage, solid cable take XLPE (crosslinked polyethylene) insulated power cable as representative is with its rational technique and structure, and good electric property and safe and reliable operation characteristic have obtained using more and more widely.Especially more obtained huge progress in the high voltage power transmission field.Compare with oil-filled cable, the crosslinked cable laying installation is convenient, and operation maintenance is simple, does not have the flow problem that drops down of oil.
But operation in recent years and studies show that, the insulation of XLPE cable are in operation easily moisture inspiration interface, cause insulation ag(e)ing to destroy, and have seriously affected the safe operation of XLPE insulated power cable.The XLPE power cable in operational process, between the intermediate head of prefabrication type silicon rubber and the cable XLPE insulation course interface along with the load variation and the formed cell breath that expands with heat and contract with cold with moisture inspiration interface; Hydrone in the soil also is moved into the intermediate head interface as directional migration under the effect of electric field.Moisture and migration moisture condense into the very high globule of specific inductive capacity at the intermediate head interface, interface surface resistance is sharply descended and the formation creeping discharge, finally cause the intermediate head insulation flashover to puncture.In conjunction with s own situation, the Shanghai underground water table is higher, and the XLPE cable long period of soaking is in water, and especially intermediate head (being multi-layer solid complex media insulation system) is made moist easily into water.
In the face of the problems referred to above, the water cut situation that how to detect the XLPE cable surface becomes a more and more important problem, and domestic less in this research on the one hand.Existence between the cable data such as research cable surface water cut and conductivity concerns, therefore can study by the conductivity of moist solids cable the detection scheme of water cut, so the detection of conductivity has then become necessary prerequisite.
Summary of the invention
Purpose of the present invention is exactly the electric conductivity detection method that a kind of fast and accurately moist solids cable is provided for the defective that overcomes above-mentioned prior art existence.
Purpose of the present invention can be achieved through the following technical solutions:
A kind of electric conductivity detection method of moist solids cable, the method may further comprise the steps:
1) solid cable to be detected is carried out pre-service, so that the solid cable surface exposes main insulating layer, as measuring section;
2) introduce DC voltage at the measuring section two ends of solid cable, detect measuring section along the face leakage current;
3) according to calculate the conductivity that obtains the solid cable along the face leakage current.
Described solid cable comprises conductor, inner semiconductor layer, main insulating layer, outer semiconductor layer and the copper shield that sets gradually from the inside to the outside, by outer semiconductor layer and the copper shield on a certain section of the pre-service place to go solid cable, as measuring section.
The length of described measuring section is 4～8cm.
Step 2) before DC voltage is introduced at the measuring section two ends in, needs solid erecting cable to be detected to more than the liftoff 0.5m.
Step 2) DC voltage that introduce at the measuring section two ends in is greater than 1000V.
Compared with prior art, the present invention adopt the mode of indirect measurement detect measuring section along the face leakage current, according to the conductivity of obtaining the moist solids cable along the face leakage current, detect quick and precisely, by conductivity and the moisture the relationship between quantities of cable surface, can be applied to the detection of water cut.
Description of drawings
Fig. 1 is process flow diagram of the present invention;
Fig. 2 is the synoptic diagram of solid cable.
Embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
Embodiment
As shown in Figure 1, a kind of electric conductivity detection method of moist solids cable, the method may further comprise the steps:
1) solid cable to be detected is carried out pre-service.Because the solid cable comprises conductor 1, inner semiconductor layer 2, main insulating layer 3, outer semiconductor layer 4 and the copper shield 5 that sets gradually from the inside to the outside, by outer semiconductor layer and the copper shield on a certain section of the pre-service place to go solid cable, so that main insulating layer 3 is exposed out, as measuring section.In the present embodiment, the length of measuring junction is 5cm.
2) with solid erecting cable to be detected to liftoff 0.8m, then introduce the DC voltage of 2000V at the measuring section two ends of solid cable, detect measuring section along the face leakage current;
3) according to calculate obtaining the conductivity of solid cable along the face leakage current, thereby obtain the electric conductivity of cable.
The present invention adopt the mode of indirect measurement detect measuring section along the face leakage current, according to the conductivity of obtaining the moist solids cable along the face leakage current, detect quick and precisely, by conductivity and the moisture the relationship between quantities of cable surface, can be applied to the detection of water cut.
Claims (5)
1. the electric conductivity detection method of a moist solids cable is characterized in that the method may further comprise the steps:
1) solid cable to be detected is carried out pre-service, so that the solid cable surface exposes main insulating layer, as measuring section;
2) introduce DC voltage at the measuring section two ends of solid cable, detect measuring section along the face leakage current;
3) according to calculate the conductivity that obtains the solid cable along the face leakage current.
2. the electric conductivity detection method of a kind of moist solids cable according to claim 1, it is characterized in that, described solid cable comprises conductor, inner semiconductor layer, main insulating layer, outer semiconductor layer and the copper shield that sets gradually from the inside to the outside, by outer semiconductor layer and the copper shield on a certain section of the pre-service place to go solid cable, as measuring section.
3. the electric conductivity detection method of a kind of moist solids cable according to claim 2 is characterized in that, the length of described measuring section is 4～8cm.
4. the electric conductivity detection method of a kind of moist solids cable according to claim 1 is characterized in that step 2) in before the measuring section two ends introduce DC voltage, needing will solid erecting cable to be detected extremely more than the liftoff 0.5m.
5. the electric conductivity detection method of a kind of moist solids cable according to claim 1 is characterized in that step 2) in the DC voltage introduced of measuring section two ends greater than 1000V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105880812A CN103076498A (en) | 2012-12-30 | 2012-12-30 | Method of detecting conductivity of moist solid cable |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012105880812A CN103076498A (en) | 2012-12-30 | 2012-12-30 | Method of detecting conductivity of moist solid cable |
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| CN103076498A true CN103076498A (en) | 2013-05-01 |
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| CN2012105880812A Pending CN103076498A (en) | 2012-12-30 | 2012-12-30 | Method of detecting conductivity of moist solid cable |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103698605A (en) * | 2013-12-13 | 2014-04-02 | 武汉钢铁(集团)公司 | Method for measuring electric conductivity of wire for copper-clad steel |
| CN112698102A (en) * | 2020-12-25 | 2021-04-23 | 广东电网有限责任公司电力科学研究院 | Method and device for testing interfacial resistivity of composite insulator sheath and core rod |
Citations (5)
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| JPS6483158A (en) * | 1987-09-25 | 1989-03-28 | Asahi Chemical Micro Syst | Measuring method of insulation resistance and measuring apparatus thereof |
| JPH07311230A (en) * | 1994-05-18 | 1995-11-28 | Sumitomo Electric Ind Ltd | Method and device for monitoring insulation, which monitor insulating state of power cable in hot-line state |
| CN1834673A (en) * | 2006-03-06 | 2006-09-20 | 西安交通大学 | Insulating state on-line monitoring method of cross-linked PE cable |
| CN201527833U (en) * | 2009-10-29 | 2010-07-14 | 国网电力科学研究院武汉南瑞有限责任公司 | Intelligent ultrahigh voltage XLPE power cable capable of enabling partial discharge to be online monitored |
| CN102778638A (en) * | 2012-09-11 | 2012-11-14 | 中国电力科学研究院 | Method for judging aging state of cross linked polyethylene (XLPE) cable insulation water tree |
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2012
- 2012-12-30 CN CN2012105880812A patent/CN103076498A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6483158A (en) * | 1987-09-25 | 1989-03-28 | Asahi Chemical Micro Syst | Measuring method of insulation resistance and measuring apparatus thereof |
| JPH07311230A (en) * | 1994-05-18 | 1995-11-28 | Sumitomo Electric Ind Ltd | Method and device for monitoring insulation, which monitor insulating state of power cable in hot-line state |
| CN1834673A (en) * | 2006-03-06 | 2006-09-20 | 西安交通大学 | Insulating state on-line monitoring method of cross-linked PE cable |
| CN201527833U (en) * | 2009-10-29 | 2010-07-14 | 国网电力科学研究院武汉南瑞有限责任公司 | Intelligent ultrahigh voltage XLPE power cable capable of enabling partial discharge to be online monitored |
| CN102778638A (en) * | 2012-09-11 | 2012-11-14 | 中国电力科学研究院 | Method for judging aging state of cross linked polyethylene (XLPE) cable insulation water tree |
Non-Patent Citations (2)
| Title |
|---|
| 彭潜: "工频耐压试验在XLPE电缆绝缘检测中的研究", 《中国优秀博硕士学位论文全文数据库（硕士） 工程科技Ⅱ辑》, no. 05, 15 May 2006 (2006-05-15) * |
| 霍振星: "基于10kV XLPE电缆的绝缘老化分析研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》, no. 2, 15 December 2011 (2011-12-15) * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103698605A (en) * | 2013-12-13 | 2014-04-02 | 武汉钢铁(集团)公司 | Method for measuring electric conductivity of wire for copper-clad steel |
| CN103698605B (en) * | 2013-12-13 | 2016-03-16 | 武汉钢铁(集团)公司 | A kind of measuring method of electric conductivity of wire for copper-clad steel |
| CN112698102A (en) * | 2020-12-25 | 2021-04-23 | 广东电网有限责任公司电力科学研究院 | Method and device for testing interfacial resistivity of composite insulator sheath and core rod |
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Application publication date: 20130501 |