CN111913043A - Device and method for testing radial resistivity of cable buffer layer - Google Patents
Device and method for testing radial resistivity of cable buffer layer Download PDFInfo
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- CN111913043A CN111913043A CN202010901590.0A CN202010901590A CN111913043A CN 111913043 A CN111913043 A CN 111913043A CN 202010901590 A CN202010901590 A CN 202010901590A CN 111913043 A CN111913043 A CN 111913043A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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Abstract
The invention discloses a radial resistivity testing device of a cable buffer layer, which comprises a direct current power supply, an ammeter, a voltmeter, an upper hollow outer electrode, an upper inner electrode, a lower hollow outer electrode, a lower inner electrode, an upper insulating cushion block, a lower insulating cushion block and a pressurizing block, wherein a cable buffer layer sample is arranged between the upper hollow outer electrode and the upper inner electrode, and between the upper hollow outer electrode and the lower hollow outer electrode, and between the pressurizing block and the sample, the direct current power supply, the ammeter, the upper hollow outer electrode, the cable buffer layer sample and the lower hollow outer electrode are communicated to form a testing current loop, the cable buffer layer sample, the voltmeter, the upper inner electrode and the lower inner electrode are communicated to form a testing voltage loop, the testing voltage is provided by the direct current power supply, the voltage between the electrodes is tested by the ammeter, the current between the electrodes is tested, and the, and finally obtaining more accurate radial resistivity by utilizing the relation between the resistance and the resistivity.
Description
Technical Field
The invention relates to the technical field of electrician detection, in particular to a device and a method for testing radial resistivity of a cable buffer layer.
Background
High-voltage cross-linked polyethylene cables have been used in China for more than thirty years, currently, the localization is basically realized, and over ten thousand kilometers of high-voltage cables are buried underground every year. During the migration, the change-over and the body fault dissection of the high-voltage cable in the last ten years, the phenomena of 'ablation' and 'white spot' on the surfaces of the buffer layer and the insulation shielding are found to be generated greatly. The analysis of the cause of the fault is related to the change in resistance of the cable buffer layer. Because national standards do not stipulate the resistivity measurement method of the cable buffer layer, the measurement method in engineering is not uniform, and the measurement data is inaccurate. The cable buffer layer is made of a semi-conductive material, voltage and current loops are not distinguished when the resistance of the cable buffer layer is measured by a conventional voltammetry method, measurement errors caused by contact resistance of the cable buffer layer are large, and the resistivity of the real cable buffer layer cannot be reflected.
Disclosure of Invention
The invention aims to provide a device and a method for testing the radial resistivity of a cable buffer layer, which can realize the purpose of quickly and accurately testing the radial resistivity of the cable buffer layer.
In order to realize the purpose, the invention designs a radial resistivity testing device of a cable buffer layer, which comprises a direct current power supply, an ammeter, a voltmeter, an upper hollow outer electrode, an upper inner electrode, a lower hollow outer electrode, a lower inner electrode, an upper insulating cushion block, a lower insulating cushion block and a pressurizing block, wherein one end of the direct current power supply is connected with the upper hollow outer electrode, the other end of the direct current power supply is connected with one end of the ammeter, the other end of the ammeter is connected with the lower hollow outer electrode, two ends of the voltmeter are respectively connected with the upper inner electrode and the lower inner electrode, a cable buffer layer sample is positioned between the upper hollow outer electrode and the lower hollow outer electrode, the upper inner electrode penetrates into the upper hollow outer electrode and is fixed with the upper hollow outer electrode, an insulating layer is arranged between the upper inner electrode and the upper hollow outer electrode, and the bottom end of, the lower inner electrode penetrates into the lower hollow outer electrode and is fixed with the lower hollow outer electrode, an insulating layer is arranged between the lower inner electrode and the lower hollow outer electrode, the top end of the lower inner electrode is attached to a cable buffer layer sample, the bottom end of the lower hollow outer electrode is arranged on the lower insulating cushion block, an upper insulating cushion block is arranged on the upper hollow outer electrode, and a pressing block capable of applying pressure to the upper insulating cushion block is arranged at the top of the upper insulating cushion block.
The invention has the beneficial effects that:
1. the invention can quickly realize the accurate alignment of the upper electrode and the lower electrode, flexibly apply pressure and is more convenient and faster to test.
2. The invention separates the test voltage loop from the current loop, avoids the test error caused by contact resistance, obtains more accurate radial resistivity of the cable buffer layer, and is suitable for popularization and use in the field.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a cable buffer layer structure according to the present invention;
FIG. 3 is a top view of the upper hollow outer electrode portion of the present invention;
FIG. 4 is a top view of the lower hollow outer electrode portion of the present invention.
The device comprises a direct current power supply 1, an ammeter 2, a voltmeter 3, a guide post 4, an upper hollow outer electrode 5, an upper inner electrode 6, a lower hollow outer electrode 7, a lower inner electrode 8, an upper insulating cushion block 9, a lower insulating cushion block 10, a pressing block 11, a hanging buckle 12, a wire rod 13, a cable buffer layer sample 14, an insulating layer 15, fluffy cotton 16, water blocking powder 17 and semi-conductive non-woven fabric 18.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples:
the radial resistivity testing device for the cable buffer layer designed by the invention comprises a direct current power supply 1, an ammeter 2, a voltmeter 3, an upper hollow outer electrode 5, an upper inner electrode 6, a lower hollow outer electrode 7, a lower inner electrode 8, an upper insulating cushion block 9, a lower insulating cushion block 10 and a pressure applying block 11, wherein one end of the direct current power supply 1 is connected with the upper hollow outer electrode 5, the other end of the direct current power supply 1 is connected with one end of the ammeter 2, the other end of the ammeter 2 is connected with the lower hollow outer electrode 7, two ends of the voltmeter 3 are respectively connected with the upper inner electrode 6 and the lower inner electrode 8, a cable buffer layer sample 14 is positioned between the upper hollow outer electrode 5 and the lower hollow outer electrode 7, the upper inner electrode 6 penetrates into the upper hollow outer electrode 5, and an insulating layer 15 is arranged between the upper inner electrode 6 and the upper hollow outer electrode 5, the bottom end of the upper inner electrode 6 is attached to a cable buffer layer sample 14, the lower inner electrode 8 penetrates into the lower hollow outer electrode 7, an insulating layer 15 is arranged between the lower inner electrode 8 and the lower hollow outer electrode 7, the top end of the lower inner electrode 8 is attached to the cable buffer layer sample 14, the bottom end of the lower hollow outer electrode 7 is arranged on a lower insulating cushion block 10, an upper insulating cushion block 9 is arranged on the upper hollow outer electrode 5, and a pressure applying block 11 capable of applying pressure to the upper insulating cushion block 9 is arranged at the top of the upper insulating cushion block 9.
In the technical scheme, the device further comprises a guide post 4, wherein the guide post 4 penetrates through an upper insulating cushion block 9 and a lower insulating cushion block 10, and the upper insulating cushion block 9 can slide up and down on the guide post 4.
Among the above-mentioned technical scheme, it still includes wire rod 13, wire rod 13 is vertical to be fixed at upper portion insulating pad 9 top, and wire rod 13 vertically runs through and exerts pressure piece 11, and exerts pressure piece 11 and can slide from top to bottom on wire rod 13, and the top of exerting pressure piece 11 is equipped with suspension clasp 12.
In the above technical solution, the material of the upper hollow external electrode 5, the upper internal electrode 6, the lower hollow external electrode 7 and the lower internal electrode 8 is preferably copper material.
The top of the upper inner electrode 6 penetrates through the pressurizing block 11 and then is connected with the corresponding end of the voltmeter 3, the upper hollow outer electrode 5 and the lower hollow outer electrode 7 are both hollow cylindrical electrodes, and the upper hollow outer electrode 5 and the lower hollow outer electrode 7 are coaxially arranged.
In the above technical solution, the pressure applying block 11 includes a plurality of sub pressure applying blocks, each sub pressure applying block is independent of another, the applying pressure is determined according to the number of the sub pressure applying blocks, the applying pressure of each sub pressure applying block is 1 kg, and the number of the sub pressure applying blocks is determined according to the experimental requirements.
In the above technical solution, the cable buffer layer sample 14 may be in a disc shape, and has a three-layer structure of fluffy cotton 16, water-blocking powder 17, and semi-conductive non-woven fabric 18, with a typical diameter of 25mm, and the semi-conductive non-woven fabric 18 is located at one side of the upper hollow outer electrode 5 and the upper inner electrode 6, as shown in fig. 2.
A method for testing the radial resistivity of a cable buffer layer comprises the following steps:
step 1: placing a cable buffer layer sample 14 between the upper hollow outer electrode 5 and the lower hollow outer electrode 7;
step 2: the voltage applying block 11 applies preset pressure to the cable buffer layer sample 14 through the upper insulating cushion block 9, the direct current power supply 1, the ammeter 2, the upper hollow outer electrode 5, the cable buffer layer sample 14 and the lower hollow outer electrode 7 are communicated to form a test current loop, and the cable buffer layer sample 14, the upper inner electrode 6, the lower inner electrode 8 and the voltmeter 3 are communicated to form a test voltage loop;
and step 3: the method comprises the steps of providing a test voltage through a direct current power supply 1, testing an inter-electrode voltage between an upper inner electrode 6 and a lower inner electrode 8 by using a voltmeter 3, testing an electrode current flowing through an upper hollow outer electrode 5 and a lower hollow outer electrode 7 by using an ammeter 2, obtaining a radial resistance value of a cable buffer layer sample 14 according to ohm's law, and obtaining a radial resistivity by using a relation between the radial resistance value and the resistivity.
In the above technical solution, the pressing block 11 slides downwards along the wire rod 13 and applies pressure to the upper insulating pad 9.
In the technical scheme, the upper insulating cushion block 9 slides downwards along the guide column 4 under the pressure action of the pressure applying block 11, so that pressure is applied to the upper hollow outer electrode 5, and further preset pressure is applied to the cable buffer layer sample 14.
In the above technical solution, the radial resistance of the cable buffer layer sample 14 is obtained according to ohm's law, that is, the radial resistance R of the cable buffer layer sample 14 is the voltage U detected by the voltmeter 3 divided by the current I detected by the ammeter 2, and then the radial resistivity ρ of the cable buffer layer sample 14 is:
where L is the sample thickness and S is the surface area of the sample between the upper and lower internal electrodes.
Claims (10)
1. The utility model provides a radial resistivity testing arrangement of cable buffer layer which characterized in that: the device comprises a direct current power supply (1), an ammeter (2), a voltmeter (3), an upper hollow outer electrode (5), an upper inner electrode (6), a lower hollow outer electrode (7), a lower inner electrode (8), an upper insulating cushion block (9), a lower insulating cushion block (10) and a pressure applying block (11), wherein one end of the direct current power supply (1) is connected with the upper hollow outer electrode (5), the other end of the direct current power supply (1) is connected with one end of the ammeter (2), the other end of the ammeter (2) is connected with the lower hollow outer electrode (7), two ends of the voltmeter (3) are respectively connected with the upper inner electrode (6) and the lower inner electrode (8), a cable buffer layer sample (14) is positioned between the upper hollow outer electrode (5) and the lower hollow outer electrode (7), the upper inner electrode (6) penetrates into the upper hollow outer electrode (5) and is fixed with the upper hollow outer electrode (5), and an insulating layer (15) is arranged between the upper inner electrode (6) and the upper hollow outer electrode (5), the bottom end of the upper inner electrode (6) is attached to a cable buffer layer sample (14), the lower inner electrode (8) penetrates into the lower hollow outer electrode (7) and is fixed with the lower hollow outer electrode (7), the insulating layer (15) is arranged between the lower inner electrode (8) and the lower hollow outer electrode (7), the top end of the lower inner electrode (8) is attached to the cable buffer layer sample (14), the bottom end of the lower hollow outer electrode (7) is arranged on a lower insulating cushion block (10), an upper insulating cushion block (9) is arranged on the upper hollow outer electrode (5), and a pressure applying block (11) capable of applying pressure to the upper insulating cushion block (9) is arranged at the top of the upper insulating cushion block (9).
2. The apparatus for testing the radial resistivity of the cable buffer layer according to claim 1, wherein: the guide post structure is characterized by further comprising a guide post (4), wherein the guide post (4) penetrates through an upper insulating cushion block (9) and a lower insulating cushion block (10), and the upper insulating cushion block (9) can slide up and down on the guide post (4).
3. The apparatus for testing the radial resistivity of the cable buffer layer according to claim 1, wherein: it still includes wire rod (13), wire rod (13) are vertical to be fixed at upper portion insulating pad (9) top, and wire rod (13) are vertical to run through and are executed briquetting (11), and execute briquetting (11) and can slide from top to bottom on wire rod (13).
4. The apparatus for testing the radial resistivity of the cable buffer layer according to claim 3, wherein: the top of the pressing block (11) is provided with a hanging buckle (12).
5. The apparatus for testing the radial resistivity of the cable buffer layer according to claim 1, wherein: the top of the upper inner electrode (6) penetrates through the pressure applying block (11) and then is connected with the corresponding end of the voltmeter (3).
6. The apparatus for testing the radial resistivity of the cable buffer layer according to claim 1, wherein: the upper hollow outer electrode (5) and the lower hollow outer electrode (7) are both hollow cylindrical electrodes, and the upper hollow outer electrode (5) and the lower hollow outer electrode (7) are coaxially arranged.
7. The apparatus for testing the radial resistivity of the cable buffer layer according to claim 1, wherein: the pressing block (11) comprises a plurality of sub-pressing blocks, and each sub-pressing block is independent.
8. A method for testing the radial resistivity of a buffer layer of a cable by using the device of claim 1, comprising the steps of:
step 1: placing a cable buffer layer sample (14) between an upper hollow outer electrode (5) and a lower hollow outer electrode (7);
step 2: the cable buffer layer test piece testing device is characterized in that a preset pressure is applied to a cable buffer layer test piece (14) by a pressing block (11) through an upper insulating cushion block (9), a direct current power supply (1), an ammeter (2), an upper hollow outer electrode (5), the cable buffer layer test piece (14) and a lower hollow outer electrode (7) are communicated to form a testing current loop, and the cable buffer layer test piece (14), an upper inner electrode (6), a lower inner electrode (8) and a voltmeter (3) are communicated to form a testing voltage loop;
and step 3: the method comprises the steps of providing a testing voltage through a direct current power supply (1), testing the voltage between an upper inner electrode (6) and a lower inner electrode (8) through a voltmeter (3), testing the electrode current flowing through an upper hollow outer electrode (5) and a lower hollow outer electrode (7) through an ammeter (2), obtaining the radial resistance value of a cable buffer layer sample (14) according to ohm's law, and obtaining the radial resistivity through the relation between the radial resistance value and the resistivity.
9. The method for testing the radial resistivity of the cable buffer layer according to claim 8, wherein: in the step 2, the pressing block (11) slides downwards along the wire rod (13) and applies pressure to the upper insulating cushion block (9).
10. The method for testing the radial resistivity of the cable buffer layer according to claim 9, wherein: in the step 2, the upper insulating cushion block (9) slides downwards along the guide column (4) under the pressure action of the pressure applying block (11), so that pressure is applied to the upper hollow outer electrode (5), and further preset pressure is applied to the cable buffer layer sample (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010901590.0A CN111913043A (en) | 2020-08-31 | 2020-08-31 | Device and method for testing radial resistivity of cable buffer layer |
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| CN202010901590.0A CN111913043A (en) | 2020-08-31 | 2020-08-31 | Device and method for testing radial resistivity of cable buffer layer |
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| CN202010901590.0A Pending CN111913043A (en) | 2020-08-31 | 2020-08-31 | Device and method for testing radial resistivity of cable buffer layer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113406392A (en) * | 2021-06-16 | 2021-09-17 | 国网安徽省电力有限公司电力科学研究院 | Resistance measuring device and resistance measuring method in cable buffer layer ablation process |
| CN114062807A (en) * | 2021-11-08 | 2022-02-18 | 广东电网有限责任公司广州供电局 | Aging detection method for solid insulating material |
-
2020
- 2020-08-31 CN CN202010901590.0A patent/CN111913043A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113406392A (en) * | 2021-06-16 | 2021-09-17 | 国网安徽省电力有限公司电力科学研究院 | Resistance measuring device and resistance measuring method in cable buffer layer ablation process |
| CN113406392B (en) * | 2021-06-16 | 2022-05-03 | 国网安徽省电力有限公司电力科学研究院 | Resistance measuring device and resistance measuring method in cable buffer layer ablation process |
| CN114062807A (en) * | 2021-11-08 | 2022-02-18 | 广东电网有限责任公司广州供电局 | Aging detection method for solid insulating material |
| CN114062807B (en) * | 2021-11-08 | 2024-02-23 | 广东电网有限责任公司广州供电局 | Aging detection method for solid insulating material |
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