CN209878936U - Experimental device for be used for studying cable insulation damage cumulative effect - Google Patents
Experimental device for be used for studying cable insulation damage cumulative effect Download PDFInfo
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- CN209878936U CN209878936U CN201920516110.1U CN201920516110U CN209878936U CN 209878936 U CN209878936 U CN 209878936U CN 201920516110 U CN201920516110 U CN 201920516110U CN 209878936 U CN209878936 U CN 209878936U
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- 238000009413 insulation Methods 0.000 title claims abstract description 31
- 230000006378 damage Effects 0.000 title claims abstract description 22
- 230000001186 cumulative effect Effects 0.000 title claims abstract description 16
- 238000007789 sealing Methods 0.000 claims description 12
- 238000002474 experimental method Methods 0.000 claims description 6
- 238000009825 accumulation Methods 0.000 claims 4
- 230000000694 effects Effects 0.000 claims 4
- 230000005684 electric field Effects 0.000 abstract description 5
- 235000012431 wafers Nutrition 0.000 description 17
- 229920003020 cross-linked polyethylene Polymers 0.000 description 4
- 239000004703 cross-linked polyethylene Substances 0.000 description 4
- 230000001066 destructive effect Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000009863 impact test Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- Testing Relating To Insulation (AREA)
Abstract
The utility model discloses an experimental apparatus for be used for studying cable insulation damage cumulative effect, include: an insulating housing, an upper electrode and a lower electrode; the insulating housing includes: an upper cover and a housing; the upper cover is detachably and fixedly connected with the shell; the inner wall of the bottom of the cavity is fixedly provided with the lower electrode; the inner wall of the upper cover can be adjusted up and down and is detachably provided with the upper electrode; the distance between the upper electrode and the lower electrode is adjustable. The utility model discloses an experimental apparatus can realize corresponding with the electric field that the cable sample wafer changes, can obtain more accurate measuring result.
Description
Technical Field
The utility model belongs to the technical field of high voltage technology and insulation, in particular to an experimental apparatus for be used for studying cable insulation damage cumulative effect.
Background
With the acceleration of the urban modernization process, the demand and application of power cables have also increased dramatically. For overhead wire, power cable power transmission is reliable, and the probability of breaking down is little, and maintenance work volume is few, and difficult the personnel harm that causes, the mountable need not to erect the shaft tower in the underground, can not beautify the city and cause the influence. Rubber-plastic insulated power cables, particularly Cross-linked Polyethylene (XLPE) cables, have found widespread use in power systems throughout the world. The XLPE cable with excellent insulating property has the characteristics of good mechanical property, convenient installation and maintenance, high transmission capacity ratio, simple and convenient production process, contribution to large-scale production and the like, exceeds the oiled paper insulated cable, and plays a very important role in domestic and foreign electric power systems.
Statistically, a cable may be subjected to up to ten thousand overvoltage surges (including operational surges, lightning surges) over its life cycle. Normally, this type of surge voltage does not directly damage the XLPE insulation, and each surge may exacerbate the degradation of the cable insulation. In particular, the destructive action of this type of overvoltage is further enhanced when the cable is defective in installation. According to the report of a power supply bureau in a certain city, when a cable line is closed, explosion accidents of a cable body and a joint often occur. Therefore, it is urgent to study the destructive effect of the operating overvoltage on the cable insulation.
In an experiment for researching the destructive effect of the overvoltage on the cable insulation, when the cable sample wafer has an insulation defect, the electric field distribution of the cable sample wafer can be changed to a certain extent, the existing electrode can not correspond to the cable sample wafer, the measurement result deviation is large, and the guidance of the measurement result is not strong.
In summary, there is a need for an experimental electrode for studying the cumulative effect of operating overvoltage on cable insulation damage.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an experimental apparatus for be used for studying cable insulation damage cumulative effect to solve the above-mentioned one or more technical problem who exists. The utility model discloses an experimental apparatus can realize corresponding with the electric field that the cable sample wafer changes, can obtain more accurate measuring result.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an experimental apparatus for studying the cumulative effect of cable insulation damage, comprising: an insulating housing, an upper electrode and a lower electrode; the insulating housing includes: an upper cover and a housing; the upper cover is detachably and fixedly connected with the shell; the inner wall of the bottom of the cavity is fixedly provided with the lower electrode; the inner wall of the upper cover can be adjusted up and down and is detachably provided with the upper electrode; the distance between the upper electrode and the lower electrode is adjustable.
Furthermore, the adjustable range of the distance between the upper electrode and the lower electrode is 1 mm-5 mm.
Further, an observation window is arranged on the shell and used for observing the experimental condition in the cavity.
Further, the upper cover and the shell are detachably and fixedly connected through a thread structure.
Furthermore, the upper cover is provided with an installation through hole, and a conductive connecting piece is installed in the installation through hole; the connecting piece is provided with a connecting external thread, and the upper electrode can be vertically adjusted through the connecting external thread and can be detachably mounted on the inner wall of the upper cover.
Further, a sealing device is arranged between the lower electrode and the inner wall of the bottom of the cavity.
Further, transformer oil is injected into the cavity.
Furthermore, a groove is machined in one side, which is in contact with the inner wall of the bottom of the cavity, of the lower electrode, and a sealing gasket is installed in the groove.
Further, the lower electrode is fixedly arranged on the inner wall of the bottom of the cavity through a conductive connecting piece.
Further, the lower electrode is a circular electrode; the upper electrode is a flat plate electrode, a ball electrode or a needle electrode.
Compared with the prior art, the utility model has the advantages of it is following:
the utility model provides an impact experiment electrode for cable sample wafer can simulate the insulation system of cable, makes cable sample wafer bear the cable normal during operation electric field intensity in the experimentation, can be used to research cable insulation damage cumulative effect. The electrode of the utility model has simple structure, the upper electrode can be replaced, and the distance between the upper electrode and the lower electrode can be adjusted, thus meeting the experiment requirements of different sample wafers; because the upper electrode and the connecting piece are fixed through the detachable structure, the upper electrode can be replaced at any time. By replacing different electrodes, the cable insulation structure can correspond to electric fields borne by an actual cable under different defects, namely when the upper electrode is a flat electrode, the corresponding situation is the insulation structure of a normal cable; when the upper electrode is a ball electrode or a needle electrode, the corresponding situation is that the cable insulation has tiny or serious defects, a more accurate measurement result can be obtained, and theoretical guidance can be carried out on actual production to a certain extent.
Furthermore, the adjustable range of the spacing is set to be 1-5 mm, so that the test requirements of sample wafers with different thicknesses can be met.
Further, the lower electrode downside is provided with the sealing washer recess, has injected into transformer oil in the cavity, can avoid experimental voltage too high to lead to the sample wafer to take place the creeping on the face in the experimentation.
Furthermore, the lower electrode is circular, so that the processing is convenient and the cable sample wafer is convenient to place.
Drawings
Fig. 1 is a schematic structural diagram of an experimental apparatus for studying cumulative effect of insulation damage of a cable according to an embodiment of the present invention;
in fig. 1, an upper cover; 2. a housing; 4. a connecting member; 5. an upper electrode; 6. a lower electrode; 7. a sealing gasket; 8. and a nut.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, an experimental apparatus for studying cable insulation damage cumulative effect according to an embodiment of the present invention includes: the electrode comprises an upper cover 1, a shell 2, a connecting piece 4, an upper electrode 5, a lower electrode 6, a sealing gasket 7 and a nut 8.
The upper cover 1 and the shell 2 are fixedly connected through a thread structure, and a closed cavity can be formed by butting the upper cover and the shell; specifically, the inner side of the upper cover is carved with internal threads, and the outer side of the upper end of the cavity is carved with external threads. The upper electrode 5 and the upper cover 1 and the lower electrode 6 and the shell 2 are fixedly connected through a connecting piece 4 and a nut 8. The upper electrode 5 is connected with the connecting piece 4 through a thread structure, so that the electrodes can be conveniently replaced at any time, and the distance between the upper electrode and the lower electrode is controlled by rotating the upper electrode 5. The surface of the lower electrode 6, which is contacted with the inner wall of the shell 2, is provided with a groove, and a sealing gasket 7 is arranged in the groove.
Wherein, the material of casing 2 and upper cover 1 is organic glass, or both are provided with the observation window, and the material of upper and lower electrode and connecting piece is copper.
The upper electrode 5 is connected with the connecting piece 4 through a triangular thread structure, and the connecting structure is favorable for conveniently replacing different upper electrodes so as to meet different experimental requirements. In addition, the structure is adopted, so that the distance between the upper electrode and the lower electrode can be adjusted, and the adjustment range is about 1 mm-5 mm. The connecting piece 4 is engraved with external threads and the upper electrode 5 is engraved with internal threads.
Preferably, the lower electrode 6 is a circular electrode with a radius of 30 mm; a circle of grooves are formed in the lower side of the electrode and used for placing a sealing gasket 7; the end of the lower electrode 6 is arranged in a semicircular chamfer. The upper electrode is a plate electrode, a ball electrode or a pin electrode.
Preferably, the cavity in the housing 2 is filled with transformer oil.
Among them, as an example: the outer diameter of the housing 2 may be 170mm and the height may be 115 mm. The length of the thread of the connecting piece 4 may be 15 mm. The maximum outer diameter of the lower electrode 6 is 60 mm; the diameter of the groove may be 36 mm.
The utility model discloses a working process:
when the utility model is used for impact experiments, the sealing washer is embedded into the lower electrode groove, the lower electrode is fixed on the inner wall of the bottom of the shell through the connecting piece and the nut, and the lower electrode is grounded; the experimental cable sample wafer is placed in the center of the lower electrode, the upper electrode is adjusted to a proper position through the thread structure, and the cable sample wafer is tightly pressed by rotating the upper cover. The device of the utility model is simple in structure, convenient operation can satisfy the multiple experiment requirement of cable sample wafer, provides the research basis for the destructive action of research operating voltage to cable insulation.
To sum up, the utility model provides an electrode for cable sample wafer impact test, include: the electrode assembly comprises a cavity, an upper electrode, a lower electrode, a connecting piece and an upper cover; the upper cover is connected with the cavity through threads, the connecting piece is connected with the upper electrode through a thread structure, the distance between the upper electrode and the lower electrode is adjustable, and the lower side of the lower electrode is provided with the sealing ring, so that transformer oil can be injected into the cavity selectively in the experimental process. The electrode for the impact test of the cable sample wafer provided by the utility model has the advantages of simple structure, convenient operation, replaceable upper electrode and adjustable upper and lower electrode spacing, and can meet the test requirements of different sample wafers; the lower side of the lower electrode is provided with a sealing ring groove, so that transformer oil can be injected into the cavity in the experimental process, and the sample wafer can be prevented from generating surface flashover due to overhigh experimental voltage.
The above embodiments are only used to illustrate the technical solution of the present invention and not to limit the same, although the present invention is described in detail with reference to the above embodiments, those skilled in the art can still modify or equally replace the specific embodiments of the present invention, and any modification or equivalent replacement that does not depart from the spirit and scope of the present invention is within the protection scope of the claims of the present invention.
Claims (10)
1. An experimental apparatus for studying the cumulative effect of insulation damage to a cable, comprising: the insulating shell, the upper electrode (5) and the lower electrode (6);
the insulating housing includes: an upper cover (1) and a housing (2); the upper cover (1) is detachably and fixedly connected with the shell (2); a cavity for experiments is arranged in the shell (2), and the inner wall of the bottom of the cavity is fixedly provided with the lower electrode (6); the inner wall of the upper cover (1) can be adjusted up and down and is detachably installed at the same time, the upper electrode (5) can be adjusted up and down, and the upper electrode (5) and the lower electrode (6) can be adjusted in distance.
2. The experimental device for researching the cable insulation damage accumulation effect as claimed in claim 1, wherein the adjustable range of the distance between the upper electrode (5) and the lower electrode (6) is 1 mm-5 mm.
3. The experimental device for researching cable insulation damage accumulation effect as claimed in claim 1, wherein an observation window is arranged on the housing for observing experimental conditions in the cavity.
4. An experimental device for studying the cumulative effect of insulation damage on cables as claimed in claim 1, wherein said upper cover (1) and said housing (2) are detachably and fixedly connected by a screw structure.
5. The experimental device for researching the cable insulation damage accumulation effect as claimed in claim 1, wherein the upper cover (1) is provided with a mounting through hole, and a conductive connecting piece is fixedly mounted in the mounting through hole; the connecting piece is provided with a connecting external thread, and the upper electrode (5) can be vertically adjusted through the connecting external thread and can be detachably mounted on the inner wall of the upper cover.
6. An experimental device for studying the cumulative effect of insulation damage on cables according to claim 1, characterized in that a sealing device is arranged between the lower electrode (6) and the bottom inner wall of the cavity.
7. The experimental device for researching cable insulation damage accumulation effect as claimed in claim 6, wherein transformer oil is injected into the cavity.
8. The experimental device for researching the cumulative effect of the insulation damage of the cable according to claim 6, wherein a groove is formed on one side of the lower electrode (6) contacting with the inner wall of the bottom of the cavity, and a sealing gasket (7) is installed in the groove.
9. An experimental device for studying the cumulative effect of insulation damage on cables according to any one of claims 1 to 8, characterized in that the lower electrode (6) is fixedly mounted on the bottom inner wall of the cavity through a conductive connecting piece.
10. Experimental device for studying the cumulative effect of insulation damages of cables according to claim 9, characterized in that said lower electrode (6) is a circular electrode; the upper electrode (5) is a flat electrode, a ball electrode or a needle electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920516110.1U CN209878936U (en) | 2019-04-16 | 2019-04-16 | Experimental device for be used for studying cable insulation damage cumulative effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920516110.1U CN209878936U (en) | 2019-04-16 | 2019-04-16 | Experimental device for be used for studying cable insulation damage cumulative effect |
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| Publication Number | Publication Date |
|---|---|
| CN209878936U true CN209878936U (en) | 2019-12-31 |
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| CN201920516110.1U Active CN209878936U (en) | 2019-04-16 | 2019-04-16 | Experimental device for be used for studying cable insulation damage cumulative effect |
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| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111398747A (en) * | 2020-03-10 | 2020-07-10 | 广州启光智造技术服务股份有限公司 | Method for detecting use safety of marine cable |
| CN113324896A (en) * | 2021-05-27 | 2021-08-31 | 国网陕西省电力公司西安供电公司 | Experimental device for be used for high tension cable buffer layer electrochemical corrosion research that blocks water |
-
2019
- 2019-04-16 CN CN201920516110.1U patent/CN209878936U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111398747A (en) * | 2020-03-10 | 2020-07-10 | 广州启光智造技术服务股份有限公司 | Method for detecting use safety of marine cable |
| CN113324896A (en) * | 2021-05-27 | 2021-08-31 | 国网陕西省电力公司西安供电公司 | Experimental device for be used for high tension cable buffer layer electrochemical corrosion research that blocks water |
| CN113324896B (en) * | 2021-05-27 | 2023-05-09 | 国网陕西省电力公司西安供电公司 | Experimental device for be used for high tension cable buffer layer electrochemical corrosion research that blocks water |
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| TR01 | Transfer of patent right |
Effective date of registration: 20240515 Address after: No. 669, Aerospace Middle Road, National Civil Aerospace Industry Base, Xi'an City, Shaanxi Province 710199 Patentee after: Electric Power Research Institute of State Grid Shaanxi Electric Power Co.,Ltd. Country or region after: China Patentee after: XI'AN JIAOTONG University Patentee after: STATE GRID CORPORATION OF CHINA Address before: Beilin District in Shaanxi province Xi'an City friendship road 710054 No. 308 Patentee before: STATE GRID SHAANXI ELECTRIC POWER Research Institute Country or region before: China Patentee before: XI'AN JIAOTONG University Patentee before: STATE GRID CORPORATION OF CHINA |