CN212341321U - Axial resistivity testing device for cable buffer layer - Google Patents
Axial resistivity testing device for cable buffer layer Download PDFInfo
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- CN212341321U CN212341321U CN202021862115.9U CN202021862115U CN212341321U CN 212341321 U CN212341321 U CN 212341321U CN 202021862115 U CN202021862115 U CN 202021862115U CN 212341321 U CN212341321 U CN 212341321U
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Abstract
The utility model discloses a cable buffer layer axial resistivity testing device, a first voltage testing electrode, a second voltage testing electrode, a first current testing electrode and a second current testing electrode of which are embedded and fixed in a lower insulating pressing block, the first current testing electrode is positioned at the outer side of the first voltage testing electrode, and the second current testing electrode is positioned at the outer side of the second voltage testing electrode; the cable buffer layer sample is positioned between the upper insulation pressing block and the lower insulation pressing block, the first voltage testing electrode, the second voltage testing electrode, the first current testing electrode and the second current testing electrode can be in contact with the semi-conductive non-woven fabric layer of the cable buffer layer sample, one end of the direct current power supply is connected with the first current testing electrode through the ammeter, the other end of the direct current power supply is connected with the second current testing electrode, one end of the voltmeter is connected with the first voltage testing electrode, and the other end of the voltmeter is connected with the second voltage testing electrode. The utility model discloses can be fast, accurate test cable buffer layer axial resistivity.
Description
Technical Field
The utility model relates to an electrician detects technical field, specifically indicates a cable buffer layer axial resistivity testing arrangement.
Background
High-voltage XLPE 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 utility model aims at providing a cable buffer layer axial resistivity testing arrangement, the utility model discloses can be fast, accurate test cable buffer layer axial resistivity.
For realizing this purpose, the utility model discloses a cable buffer layer axial resistivity testing arrangement, its characterized in that: the device comprises an upper insulating pressing block, a lower insulating pressing block, a first voltage testing electrode, a second voltage testing electrode, a first current testing electrode, a second current testing electrode, an ammeter, a voltmeter and a direct current power supply, wherein the first voltage testing electrode, the second voltage testing electrode, the first current testing electrode and the second current testing electrode are embedded and fixed in the lower insulating pressing block, the first current testing electrode is positioned on the outer side of the first voltage testing electrode, and the second current testing electrode is positioned on the outer side of the second voltage testing electrode;
the cable buffer layer sample is positioned between the upper insulation pressing block and the lower insulation pressing block, the first voltage testing electrode, the second voltage testing electrode, the first current testing electrode and the second current testing electrode can be in contact with the semi-conductive non-woven fabric layer of the cable buffer layer sample, one end of the direct current power supply is connected with the first current testing electrode through the ammeter, the other end of the direct current power supply is connected with the second current testing electrode, one end of the voltmeter is connected with the first voltage testing electrode, and the other end of the voltmeter is connected with the second voltage testing electrode.
The utility model has the advantages that:
the utility model discloses an go up insulating briquetting, lower insulating briquetting, first voltage test electrode, second voltage test electrode, first current test electrode, second current test electrode and will test voltage return circuit and current return circuit separately, avoid the test error that contact resistance arouses, quick, accurate record cable buffer layer axial resistivity, and the pressure of applying cable buffer layer during the test is adjustable, can obtain the axial resistivity parameter that is close cable buffer layer user state more.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the upper insulating compact in bottom view;
FIG. 3 is a schematic diagram of a top view of a lower insulating compact;
fig. 4 is a schematic representation of a cable buffer sample.
The device comprises 1-upper insulation pressing block, 2-lower insulation pressing block, 3-first voltage testing electrode, 3.1-first voltage testing spare electrode, 4-second voltage testing electrode, 4.1-second voltage testing spare electrode, 5-first current testing electrode, 5.1-first current testing spare electrode, 6-second current testing electrode, 6.1-second current testing spare electrode, 7-insulation pressing block, 8-fixing rod, 9-hanging buckle, 10-guide column, 11-ammeter, 12-voltmeter, 13-DC power supply, 14-pressure testing module, 15-cable buffer layer sample, 16-fluffy cotton layer, 17-water blocking powder and 18-semi-conductive non-woven fabric layer.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples:
the utility model discloses a cable buffer layer axial resistivity testing arrangement, as shown in fig. 1-4, it includes insulating briquetting 1, insulating briquetting 2 down, first voltage test electrode 3, second voltage test electrode 4, first current test electrode 5, second current test electrode 6, ampere meter 11, voltmeter 12 and DC power supply 13, wherein, first voltage test electrode 3, second voltage test electrode 4, first current test electrode 5, second current test electrode 6 imbeds and is fixed in insulating briquetting 2 down, first current test electrode 5 is located the outside of first voltage test electrode 3, second current test electrode 6 is located the outside of second voltage test electrode 4;
the cable buffer layer sample 15 is positioned between the upper insulation pressing block 1 and the lower insulation pressing block 2, the first voltage testing electrode 3, the second voltage testing electrode 4, the first current testing electrode 5 and the second current testing electrode 6 can be in contact with the semi-conductive non-woven fabric layer 18 of the cable buffer layer sample 15, one end of the direct current power supply 13 is connected with the first current testing electrode 5 through the ammeter 11, the other end of the direct current power supply 13 is connected with the second current testing electrode 6, one end of the voltmeter 12 is connected with the first voltage testing electrode 3, and the other end of the voltmeter 12 is connected with the second voltage testing electrode 4.
In the technical scheme, the upper insulating pressing block 1 and the lower insulating pressing block 2 are both cylinders, and the cable buffer layer sample 15 is a cable buffer layer wafer with a typical diameter of 25 mm. The waterproof fabric is composed of a fluffy cotton layer 16, waterproof powder 17 and a semi-conductive non-woven fabric layer 18.
In the above technical scheme, the top end of the upper insulating pressing block 1 is provided with an insulating pressing block 7. And the insulating pressing block 7 is fixedly connected with the top end of the upper insulating pressing block 1 through a fixing rod 8. The insulating pressurizing block 7 can be composed of a plurality of sub-modules, and each sub-module is independent from the other sub-module and can be flexibly installed and taken out. Typically, each submodule may apply a pressure of 1 kg.
In the technical scheme, a hanging buckle 9 is fixed at the top end of the insulating pressurizing block 7. The suspension clasp 9 is used for rapidly loading or removing the upper insulating pressing block 1 and the insulating pressing block 7 during testing.
In the technical scheme, the device further comprises a guide post 10, wherein the guide post 10 penetrates through the lower insulating pressing block 2 and the upper insulating pressing block 1, and the upper insulating pressing block 1 can slide up and down on the guide post 10. The two guide posts 10 are arranged on the left and right, and the two guide posts 10 are used for ensuring that the first voltage testing electrode 3, the second voltage testing electrode 4, the first current testing electrode 5 and the second current testing electrode 6 are in contact with corresponding testing areas of the cable buffer layer sample 15 quickly and accurately.
In the above technical scheme, a pressure testing module 14 is arranged between the lower insulating pressing block 2 and the cable buffer layer sample 15. The pressure testing module 14 is used for measuring the pressure borne by the cable buffer layer sample 15, and can select an optical fiber sensor or a piezoresistor sheet sensor and the like.
In the above technical scheme, the upper insulating pressing block 1 and the lower insulating pressing block 2 are both cylindrical electrodes.
In the above technical solution, the upper insulating press block 1 is embedded and fixed with a first voltage testing spare electrode 3.1, a second voltage testing spare electrode 4.1, a first current testing spare electrode 5.1, and a second current testing spare electrode 6.1, the first voltage testing spare electrode 3.1 is coaxial with the first voltage testing electrode 3, the second voltage testing spare electrode 4.1 is coaxial with the second voltage testing electrode 4, the first current testing electrode 5 is coaxial with the first current testing spare electrode 5.1, and the second current testing electrode 6 is coaxial with the second current testing spare electrode 6.1. When the electrode in the lower insulating pressing block 2 has a fault, the positions of the upper insulating pressing block 1 and the lower insulating pressing block 2 can be switched, and the connection among the first voltage test standby electrode 3.1, the second voltage test standby electrode 4.1, the first current test standby electrode 5.1, the second current test standby electrode 6.1, the ammeter 11, the voltmeter 12 and the direct-current power supply 13 is carried out in a mode of pressing the insulating pressing block 2.
A method for testing the axial resistivity of a cable buffer layer by using the device comprises the following steps:
step 1: placing a cable buffer layer sample 15 between an upper insulation pressing block 1 and a lower insulation pressing block 2;
step 2: the insulation pressing block 7 applies preset pressure to the cable buffer layer sample 15 through the upper insulation pressing block 1, and the direct current power supply 13, the ammeter 11, the first current testing electrode 5, the cable buffer layer sample 15 and the second current testing electrode 6 form a testing current loop;
the voltmeter 12, the first voltage testing electrode 3, the cable buffer layer sample 15 and the second voltage testing electrode 4 form a testing voltage loop;
and step 3: the direct current power supply 13 supplies a test voltage, and the axial resistance R of the cable buffer layer sample 15 is obtained by using the voltage U detected by the voltmeter 12, the current I detected by the ammeter 11, and the distance S between the electrodes according to ohm' S law, thereby obtaining the axial resistivity ρ of the cable buffer layer sample 15.
In the technical scheme, the first current test electrode 5, the first voltage test electrode 3, the second voltage test electrode 4 and the second current test electrode 6 are on the same horizontal line of the same plane, and the distances S are respectively S1, S2, S3 and S4.
Axial resistivity ρ:
if S1 ═ S2 ═ S3 ═ S4 ═ S, the axial resistivity ρ:
ρ＝2πSU/I
in step 2 of the above technical scheme, the upper insulating pressing block 1 slides downwards along the guide post 10 under the pressure action of the insulating pressing block 7, so as to apply a preset pressure to the cable buffer layer sample 15.
Details not described in this specification are within the skill of the art that are well known to those skilled in the art.
Claims (8)
1. The utility model provides a cable buffer layer axial resistivity testing arrangement which characterized in that: the testing device comprises an upper insulating pressing block (1), a lower insulating pressing block (2), a first voltage testing electrode (3), a second voltage testing electrode (4), a first current testing electrode (5), a second current testing electrode (6), an ammeter (11), a voltmeter (12) and a direct current power supply (13), wherein the first voltage testing electrode (3), the second voltage testing electrode (4), the first current testing electrode (5) and the second current testing electrode (6) are embedded and fixed in the lower insulating pressing block (2), the first current testing electrode (5) is positioned at the outer side of the first voltage testing electrode (3), and the second current testing electrode (6) is positioned at the outer side of the second voltage testing electrode (4);
the cable buffer layer test piece (15) is located between the upper insulation pressing block (1) and the lower insulation pressing block (2), the first voltage test electrode (3), the second voltage test electrode (4), the first current test electrode (5), the second current test electrode (6) can be in contact with the semi-conductive non-woven fabric layer (18) of the cable buffer layer test piece (15), one end of the direct current power supply (13) is connected with the first current test electrode (5) through the ammeter (11), the other end of the direct current power supply (13) is connected with the second current test electrode (6), one end of the voltmeter (12) is connected with the first voltage test electrode (3), and the other end of the voltmeter (12) is connected with the second voltage test electrode (4).
2. The cable buffer layer axial resistivity testing device of claim 1, characterized in that: and an insulating pressing block (7) is arranged at the top end of the upper insulating pressing block (1).
3. The cable buffer layer axial resistivity testing device of claim 2, characterized in that: the insulating pressing block (7) is fixedly connected with the top end of the upper insulating pressing block (1) through a fixing rod (8).
4. The cable buffer layer axial resistivity test device of claim 2 or 3, characterized in that: a hanging buckle (9) is fixed at the top end of the insulating pressurizing block (7).
5. The cable buffer layer axial resistivity testing device of claim 1, characterized in that: the insulation pressing block type transformer substation is characterized by further comprising a guide post (10), wherein the guide post (10) penetrates through the lower insulation pressing block (2) and the upper insulation pressing block (1), and the upper insulation pressing block (1) can slide up and down on the guide post (10).
6. The cable buffer layer axial resistivity testing device of claim 1, characterized in that: and a pressure testing module (14) is arranged between the lower insulating pressing block (2) and the cable buffer layer sample (15).
7. The cable buffer layer axial resistivity testing device of claim 1, characterized in that: the upper insulating pressing block (1) and the lower insulating pressing block (2) are both cylindrical electrodes.
8. The cable buffer layer axial resistivity testing device of claim 1, characterized in that: a first voltage testing spare electrode (3.1), a second voltage testing spare electrode (4.1), a first current testing spare electrode (5.1) and a second current testing spare electrode (6.1) are embedded and fixed in the upper insulating pressing block (1), the first voltage testing spare electrode (3.1) is coaxial with the first voltage testing electrode (3), the second voltage testing spare electrode (4.1) is coaxial with the second voltage testing electrode (4), the first current testing electrode (5) is coaxial with the first current testing spare electrode (5.1), and the second current testing electrode (6) is coaxial with the second current testing spare electrode (6.1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021862115.9U CN212341321U (en) | 2020-08-31 | 2020-08-31 | Axial resistivity testing device for cable buffer layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021862115.9U CN212341321U (en) | 2020-08-31 | 2020-08-31 | Axial resistivity testing device for cable buffer layer |
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| Publication Number | Publication Date |
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| CN212341321U true CN212341321U (en) | 2021-01-12 |
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| CN202021862115.9U Active CN212341321U (en) | 2020-08-31 | 2020-08-31 | Axial resistivity testing device for cable buffer layer |
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| CN (1) | CN212341321U (en) |
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- 2020-08-31 CN CN202021862115.9U patent/CN212341321U/en active Active
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