CN110007179B - Cable intermediate joint electrical performance testing tool and method - Google Patents
Cable intermediate joint electrical performance testing tool and method Download PDFInfo
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- CN110007179B CN110007179B CN201811251785.4A CN201811251785A CN110007179B CN 110007179 B CN110007179 B CN 110007179B CN 201811251785 A CN201811251785 A CN 201811251785A CN 110007179 B CN110007179 B CN 110007179B
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- 238000012360 testing method Methods 0.000 title claims abstract description 93
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000002184 metal Substances 0.000 claims abstract description 72
- 229910052751 metal Inorganic materials 0.000 claims abstract description 72
- 210000001503 joint Anatomy 0.000 claims description 33
- 238000011056 performance test Methods 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 14
- 239000003822 epoxy resin Substances 0.000 claims description 8
- 229920000647 polyepoxide Polymers 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 6
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- 238000003780 insertion Methods 0.000 description 5
- 230000037431 insertion Effects 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 239000000741 silica gel Substances 0.000 description 4
- 229910002027 silica gel Inorganic materials 0.000 description 4
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- 239000011810 insulating material Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000007796 conventional method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/36—Overload-protection arrangements or circuits for electric measuring instruments
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/01—Subjecting similar articles in turn to test, e.g. "go/no-go" tests in mass production; Testing objects at points as they pass through a testing station
- G01R31/013—Testing passive components
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Cable Accessories (AREA)
Abstract
The invention discloses a tool and a method for testing electrical performance of a cable intermediate joint, belonging to the field of cable accessories and comprising a testing rod, wherein a through hole communicated with two ends of the testing rod is formed in the testing rod, and a metal pipe which has the same length as the through hole and is hollow inside is arranged in the through hole; one end of the test rod is detachably provided with a metal cap, an air gap is formed between the metal cap and the test rod, and the metal pipe is connected with the metal cap. The invention can simulate the working state of the intermediate joint during cable connection, accurately measure whether the intermediate joint has quality defects, simultaneously can be conveniently inserted into and pulled out of the intermediate joint, and does not need to clean the inner wall of the intermediate joint.
Description
Technical Field
The invention relates to the technical field of cable accessories, in particular to a tool for testing the electrical performance of a cable intermediate joint.
Background
In the process of laying a power cable transmission line, the power cable is limited in manufacturing length and needs to be connected through a cable intermediate joint, and the cable intermediate joint is mainly used for keeping the cable sealed and the circuit smooth and ensuring the insulation grade of the cable joint so as to ensure the cable joint to run safely and reliably. Therefore, the cable intermediate joint is an important component of a power cable accessory, but is also a frequently-occurring part of a power transmission line, and the electrical performance of the cable intermediate joint directly influences the safety of a power supply system.
Compared with a cable body, the cable middle joint is of a multilayer solid composite medium structure, a large number of composite sections exist inside the cable middle joint, and the defect caused by the product quality problem easily causes electric field concentration and generates an insulation weakness. In contrast, in the production process, the intermediate detection management and control of the quality of the semi-finished product need to be enhanced, and related pressure resistance test and partial discharge test need to be carried out before delivery, so that the defective product is effectively found.
Once the high voltage is connected to the middle joint of the single cable, the middle joint of the single cable is immediately broken down and burnt, and the electrical performance test cannot be directly carried out. Therefore, in the prior art, when an electrical performance test is performed on the cable, as shown in fig. 3 of the specification, an installation site needs to be simulated, two cables 9 of about 1m are passed through, and the end portions of the two cables are stripped by about 15cm and then are respectively inserted into the intermediate joint 7, an inner electrode 71 made of carbon black is integrally formed in the middle of an insulating silica gel body 73 of the intermediate joint 7, an insulating layer 91 is arranged on the outer side of a cable core 92, a connecting pipe 10 attached to the inner electrode 71 is sleeved between the stripped cable cores 91, and the connecting pipe 10 is connected between the two cable cores 91 after being pressed by a pressing pliers. A stress cone 72 is also integrally formed in the end part of the intermediate joint 7, and the stress cone 72 and the inner electrode 71 can ensure that the field intensity of the intermediate joint 7 is uniformly distributed, so that the partial discharge phenomenon caused by electric field concentration is not easy to occur.
Because the intermediate head adopts silica gel to make, the material is softer, and the stroke that the cable tip need insert is longer, hardly realizes cable and intermediate head's plug in the test process. In order to solve the problem, a conventional method is to lubricate the middle joint by using a lubricant such as silicone grease, but after the test is finished, the lubricant residue on the inner wall of the middle joint needs to be manually pressed and wiped by using a solvent such as alcohol, so that time and labor are wasted, carbon black on the inner electrode is very easily caused to fall off due to friction and adhere to an insulating layer on the outer side of a cable core, and finally the whole middle joint is easily broken down by high voltage.
Disclosure of Invention
One of the purposes of the invention is to provide a cable intermediate connector electrical performance testing tool which is convenient to connect with an intermediate connector in a plugging manner and does not need to clean the inner wall of the intermediate connector.
The technical purpose of the invention is realized by the following technical scheme:
a cable intermediate joint electrical performance test tool comprises a test rod, wherein a through hole communicated with two ends of the test rod is formed in the test rod, and a metal pipe which is equal to the through hole in length and hollow inside is arranged in the through hole;
one end of the test rod is detachably provided with a metal cap, an air gap is formed between the metal cap and the test rod, and the metal pipe is connected with the metal cap.
By adopting the technical scheme, the test tool can simulate that a cable is inserted into the middle joint, and the metal pipe and the metal cap need to be connected with the inner electrode to realize the electric conduction effect so as to carry out normal electric performance test on the middle joint. When test fixture inserted the both ends to intermediate head, can pass through tubular metal resonator and air gap with compressed air and input to the intermediate head in, because the intermediate head material is softer, can be slightly expanded by compressed air to can make things convenient for test fixture and intermediate head's plug, also can not produce the pollution to the intermediate head inside wall simultaneously, avoid the problem of the cleaning in later stage and reduce the possibility that carbon black dropped.
The invention is further configured to: the test rod comprises a clamping section and an embedding section which are integrally formed, the outer diameter of the embedding section is smaller than the inner diameter of the clamping section, and a positioning step is formed at the joint of the embedding section and the clamping section.
Through adopting above-mentioned technical scheme, the location step can inject the test rod and imbed to the inside degree of depth of intermediate head to play the effect of suggestion simultaneously.
The invention is further configured to: the metal cap comprises a connecting part and a conical part which are integrally formed, one end of the embedding section, which is far away from the clamping section, is provided with a mounting groove, a first conductive insert is arranged in the mounting groove in a fit manner, and the connecting part is in threaded connection with the first conductive insert;
the connecting part is internally provided with a first through hole communicated with the via hole along the length direction of the connecting part, the side wall of the connecting part is provided with a second through hole communicated with the first through hole in a penetrating way, and the second through hole is communicated with the air gap.
Through adopting above-mentioned technical scheme, the toper portion can make things convenient for whole test stick interference to be embedded into to the intermediate head, plays certain guide effect, and the through-hole sets up in the tip that the test stick inserted the intermediate head and communicates with the air gap simultaneously, and the resistance that receives when can making the test stick insert is littleer, has reduced the degree of difficulty that the test stick inserted.
The invention is further configured to: the embedding section is provided with the metal shielding layer that one end extends to in the clamping section around the one end lateral wall towards the clamping section.
By adopting the technical scheme, the metal shielding layer shields the electromagnetic field generated when the metal pipe is electrified in the test rod through the capacitance current during normal operation so as to reduce the electromagnetic interference generated to the outside; when the detection system is short-circuited, the short-circuit current can be used as a short-circuit current channel and is safely introduced into a grounding system so as to protect the safe operation of the detection system.
The invention is further configured to: the test bar is made of an epoxy resin material.
Through adopting above-mentioned technical scheme, the epoxy material can make the test rod have certain elasticity to satisfy its interference and imbed the requirement in the cable intermediate head, make the test rod hug closely the inside wall of intermediate head, thereby make and can not produce the air gap and lead to the electric field to concentrate between the two, arouse partial discharge and lead to the intermediate head to take place the insulation breakdown trouble. Meanwhile, the epoxy resin has good processability and pressure resistance, and can meet the pressure resistance requirement and deformation recovery requirement required by long-term experiments. In addition, the epoxy resin is used as an insulating material, and the reliability of the middle joint test can be ensured.
The invention is further configured to: the metal pipe and the metal cap are both made of copper materials.
By adopting the technical scheme, the copper has good mechanical property, processability, chemical stability and higher conductivity, and is rich in resources and easy to obtain.
The invention is further configured to: an electrical interface groove communicated with the metal pipe is formed in one end, far away from the embedding section, of the clamping section, a second conductive insert abutted against the metal pipe is arranged in the electrical interface groove in a fit mode, and internal threads are formed in the inner side wall of the second conductive insert.
Through adopting above-mentioned technical scheme, the electrically conductive insert of second not only can make things convenient for the air cock articulate with the gas charging outfit, and it can also be connected with high voltage generating equipment's power transmission line simultaneously, has made things convenient for the operation.
The invention also aims to provide a method for testing the electrical performance of the intermediate joint of the cable, which can simulate the working state of the cable during wiring, accurately test whether the intermediate joint has quality defects or not, and has the advantages of simple and reliable testing process.
A method for testing the electrical performance of a cable intermediate joint comprises the following steps:
the method comprises the following steps: keeping the middle joint horizontal and fixed, simultaneously inserting the two test rods into two ends of the middle joint of the cable, and continuously inflating the metal tube through the electric interface slot in the inserting process until the positioning step is abutted against the port of the middle joint;
step two: after the gas in the middle joint is exhausted through the electric interface groove, the metal tube is connected to the voltage to carry out electric performance test;
step three: after the electrical performance test is finished, the voltage is removed, the metal tube is grounded, the metal tube is inflated through the electrical interface slot again, the two test rods are sequentially pulled out, and after the two test rods are withdrawn by 70% -80%, the two test rods are all pulled out of the middle joint simultaneously.
By adopting the technical scheme, the electric field distribution condition of the intermediate joint can be simulated by utilizing the test tool during cable wiring, and the intermediate joint is subjected to electrical performance test at the moment, so that whether the intermediate joint has quality defects or not can be accurately judged. Meanwhile, the test fixture can be conveniently plugged and pulled out, the problem of interference fit between the intermediate joint and the test fixture is fully considered, the surface of the test fixture is tightly attached to the inner side wall of the intermediate joint, the electric breakdown phenomenon cannot occur, and the cleaning problem of the inner wall of the intermediate joint in the later period and the possibility of falling of carbon black are avoided.
In conclusion, the invention has the following beneficial effects:
1. through the arrangement of the test rod, the metal cap and the metal pipe, the condition of the cable connected with the intermediate joint can be simulated, so that whether the intermediate joint has quality defects or not can be accurately measured, and meanwhile, the metal pipe, the first through hole and the second through hole are used for discharging compressed air from the air gap, so that the test rod is smoother in the process of being inserted into the intermediate joint, and the problem of cleaning treatment of the inner wall of the intermediate joint and the possibility of carbon black falling in the later period are avoided;
2. through the arrangement of the metal shielding layer, the electromagnetic field generated by electrifying the metal pipe can be shielded, and meanwhile, the grounding can be realized when the detection system is short-circuited, so that the protection effect is realized;
3. through the setting of toper portion, can guide the interference embedding of test stick to the intermediate head in.
Drawings
FIG. 1 is a schematic structural view for embodying the whole in embodiment 1 of the present invention;
FIG. 2 is an enlarged view of part A of FIG. 1, illustrating a positional relationship between the first through hole, the second through hole and the air gap;
fig. 3 is a schematic diagram of a prior art structure for connecting a cable with an intermediate connector.
In the figure, 1, test bar; 11. a clamping section; 111. an electrical interface slot; 112. a mounting flange; 1121. a threaded hole; 12. an embedding section; 121. mounting grooves; 13. a via hole; 14. positioning a step; 2. a metal cap; 21. a connecting portion; 211. a first through hole; 212. a second through hole; 22. a tapered portion; 3. a metal shielding layer; 31. a ground bolt; 4. a metal tube; 5. an air gap; 6. a first conductive insert; 7. an intermediate joint; 71. an inner electrode; 72. a stress cone; 73. an insulating silica gel body; 8. a second conductive insert; 9. a cable; 91. an insulating layer; 92. a cable core; 10. and (4) connecting the pipes.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1: as shown in fig. 1, the tool for testing the electrical performance of the cable intermediate connector disclosed by the invention comprises a testing rod 1 and a metal cap 2. The test bar 1 is made of an epoxy resin material and includes an insert section 12 and a clamping section 11 which are integrally formed, and the inner diameter of the clamping section 11 is larger than the outer diameter of the insert section 12 so that a positioning step 14 is formed therebetween. Run through along its length direction in test bar 1 and seted up via hole 13, be provided with in the via hole 13 and equal and inside hollow tubular metal resonator 4 rather than the degree of depth, the metal cap 2 of this embodiment, tubular metal resonator 4 all adopt the copper product to make. During the use, it is required to insert the embedding section 12 into the middle joint 7 to be detected, the mounting flange 112 is further arranged around the side wall of the clamping section 11, the test rod 1 can be pushed by using an air cylinder (not shown in the figure) in the inserting process, the mounting frame can be fixedly connected to the piston rod of the air cylinder, the test rod 1 penetrates through the mounting frame and penetrates through the threaded hole 1121 on the mounting flange 112, the whole test rod 1 is fixed on the mounting frame by using a screw penetrating through the threaded hole 1121, and the pushing is stopped when the test rod 1 moves to the position step 14 to be abutted against the port of the middle joint 7.
As shown in fig. 1, a mounting groove 121 is formed in one end of the embedding section 12 away from the clamping section 11, and a first conductive insert 6 abutting against the metal pipe 4 is bonded in the mounting groove 121. The metal cap 2 comprises a column-shaped connecting part 21 and a conical part 22 which are integrally formed, the inner side wall of the first conductive insert 6 is provided with an internal thread, and the connecting part 21 is connected with the first conductive insert 6 in a threaded mode so that the connecting part can be detached from the whole test rod 1. When the connecting portion 21 is screwed into abutment with the bottom of the first conductive insert 6, an air gap 5 of 3mm-5mm is formed between the tapered portion 22 and the insert section 12. The first conductive insert 6 in this embodiment is made of a copper material because the first conductive insert 6 can be easily mounted due to the reliable adhesion between the copper and the epoxy resin material.
As shown in fig. 1 and 2, a first through hole 211 communicating with the through hole 13 is formed in the connecting portion 21 along the length direction thereof, and a second through hole 212 communicating with the first through hole 211 is formed through a side wall thereof, and an air outlet position of the second through hole 212 is aligned with the air gap 5 between the embedded section 12 and the tapered portion 22. An electrical interface groove 111 communicated with the metal tube 4 is formed in one end, far away from the embedding section 12, of the clamping section 11, a second conductive insert 8 abutted against the metal tube 4 is arranged in the electrical interface groove 111 in a fit mode, and internal threads are formed in the inner side wall of the second conductive insert 8. When the intermediate connector 7 needs to be subjected to a pressure resistance test and a partial discharge test, the embedding section 12 needs to be inserted into the intermediate connector 7, and the electrical interface groove 111 can be in threaded connection with an air pipe (not shown in the figure) with an air nozzle connector, and compressed air is conveyed in the air pipe. Since the air gap 5 is provided at the insertion end of the insertion section 12, the compressed air is discharged from the air gap 5 through the metal pipe 4, the first through hole 211, and the second through hole 212, so that the inner cavity of the intermediate joint 7 is slightly expanded and guided by the tapered portion 22 to facilitate the insertion of the insertion section 12. And then, the second conductive insert 8 is used for conducting, 10kV-30kV high voltage is input into the metal tube 4, and then the metal cap 2 and the inner electrode 71 are used for conducting, so that the voltage withstanding detection and partial discharge detection of the intermediate joint 7 are realized.
As shown in fig. 1, a metal shielding layer 3, which has one end extending into the clamping section 11, is disposed around the side wall of the embedding section 12 at the end facing the clamping section 11, and the metal shielding layer 3 is also made of copper material. The metal shielding layer 3 shields an electromagnetic field generated when the metal pipe 4 is electrified in the test rod 1 through capacitance current when the intermediate joint 7 is normally detected so as to reduce electromagnetic interference generated to the outside; when the detection system is short-circuited, the short-circuit current can be used as a short-circuit current channel and is safely introduced into a grounding system so as to protect the safe operation of the detection system.
Example 2: a method for testing the electrical performance of a cable intermediate joint comprises the following steps:
the method comprises the following steps: the middle joint 7 can be placed in two semicircular rings (not shown in the figure) which are arranged up and down to be held tightly and fixed, the middle joint is kept horizontal, the test rod 1 in the embodiment 1 is arranged on two mounting frames which can slide relatively, the embedding section 12 of the test rod 1 is inserted into two ends of the middle joint 7 by using an air cylinder, and compressed air can be continuously introduced into the metal pipe 4 by using an air pipe in the inserting process. Because a closed space is temporarily formed in the middle joint 7, the inner cavity of the middle joint is slightly expanded by utilizing compressed air so as to facilitate the insertion of the embedded section 12, and the air inflation is stopped after the positioning step 14 is abutted against the port of the middle joint 7;
step two: an air relief valve (not shown) may be disposed on the air pipe, and when the air relief valve is opened, the excess compressed air inside the intermediate connector 7 may be exhausted, so that the air pressure inside the intermediate connector is balanced with the atmospheric pressure. At this time, since the intermediate joint 7 is made of a soft silica gel material and the embedding section 12 is also made of a soft epoxy resin material, the intermediate joint 7 can automatically and tightly cover the side wall of the embedding section 12, so that the air gap 5 is not generated to cause electric field concentration. The convenience of the embedded section 12 in inserting the intermediate joint 7 is fully considered, and the interference fit requirement between the embedded section 12 and the intermediate joint 7 is considered, so that the intermediate joint 7 cannot generate insulation breakdown faults in subsequent tests.
And then inputting high voltage of 10kV-30kV into the metal pipe 4 by using high voltage generating equipment, wherein the metal cap 2 and the inner electrode 71 are communicated so as to simulate the electric field distribution condition inside the intermediate joint 7 when the cable 9 is inserted into the intermediate joint 7, and carry out withstand voltage test and partial discharge test on the metal pipe 4, and whether the intermediate joint 7 has quality defects can be accurately judged according to the test result. During the test, the side wall of the clamping section 11 can be connected with the grounding bolt 31 in a threaded manner, and the grounding bolt 31 is connected with the metal shielding layer 3 and grounded so as to protect the whole detection system from safety accidents caused by short circuit.
Wherein, electrical interface groove 111 both can be used to the input compressed air, can realize the function of metal tube 4 and high-voltage line intercommunication again simultaneously, and concrete implementation mode can be: and the air nozzle joint of the air pipe is in threaded connection with the second conductive insert 8, a metal gasket is attached and arranged between the air nozzle joint and the second conductive insert 8, and then the metal gasket is connected with a high-voltage wire.
Step three: after the test is finished, the voltage is removed, the metal pipe 4 is grounded, and the interior of the metal pipe 4 is inflated again, so that the inner cavity of the intermediate joint 7 is expanded. By utilizing the action of the air cylinder, the two test rods 1 are sequentially pulled out by 70-80%, and if the test rod 1 at one end is pulled out first, a closed cavity cannot be formed inside the middle joint 7, so that the test rod 1 at the other end is difficult to take out even in an inflated state. Finally, the two test bars 1 are all simultaneously pulled out from the ports close to the middle joint 7, and the frictional resistance to be overcome by pulling out is very small.
The detection steps not only facilitate the plugging and unplugging of the whole testing tool, but also avoid the cleaning problem of the inner wall of the middle joint 7 in the later period and the possibility of the falling of the carbon black. And the other purpose that the test rod 1 is made of epoxy resin material is that the test rod has good machinability and pressure resistance, can meet the pressure resistance requirement and deformation recovery requirement required by long-term experiment, and can ensure the reliability of the test of the intermediate joint 7 when used as an insulating material.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (9)
1. The utility model provides a cable intermediate head electrical property test fixture which characterized in that: the testing device comprises a testing rod (1), wherein through holes (13) communicated with two ends of the testing rod (1) are formed in the testing rod (1), and a metal pipe (4) which is equal to the length of the through hole (13) and is hollow inside is arranged in the through hole (13);
one end of the test rod (1) is detachably provided with a metal cap (2), and the metal tube (4) is connected with the metal cap (2); the metal cap (2) comprises a connecting part (21) and a conical part (22) which are integrally formed, and an air gap (5) is formed between the conical part (22) and the test rod (1); a first through hole (211) communicated with the via hole (13) is formed in the connecting part (21) along the length direction of the connecting part, a second through hole (212) communicated with the first through hole (211) penetrates through the side wall of the connecting part (21), and the second through hole (212) is communicated with the air gap (5); the test rod (1) is inserted from the two ends of the middle joint (7) to the middle of the middle joint (7) through the conical part (22).
2. The cable intermediate head electrical performance test fixture of claim 1, characterized in that: the test rod (1) comprises an integrally formed clamping section (11) and an embedding section (12), the outer diameter of the embedding section (12) is smaller than the inner diameter of the clamping section (11), and a positioning step (14) is formed at the joint of the embedding section (12) and the clamping section (11).
3. The cable intermediate head electrical performance test fixture of claim 2, characterized in that: an installation groove (121) is formed in one end, far away from the clamping section (11), of the embedding section (12), a first conductive insert (6) is arranged in the installation groove (121) in a fit mode, and the connecting portion (21) is in threaded connection with the first conductive insert (6).
4. The cable intermediate head electrical performance test fixture of claim 2, characterized in that: the embedding section (12) is provided with a metal shielding layer (3) with one end extending into the clamping section (11) in a surrounding mode towards the side wall of one end of the clamping section (11).
5. The cable intermediate head electrical performance test fixture of claim 2, characterized in that: the side wall of the clamping section (11) is provided with a mounting flange (112) in a surrounding mode, and a threaded hole (1121) is formed in the mounting flange (112).
6. The cable intermediate head electrical performance test fixture of claim 2, characterized in that: the test rod (1) and the mounting flange (112) are both made of epoxy resin materials.
7. The cable intermediate head electrical performance test fixture of claim 2, characterized in that: the metal tube (4) and the metal cap (2) are both made of copper materials.
8. The cable intermediate head electrical performance test fixture of claim 2, characterized in that: an electrical interface groove (111) communicated with the metal tube (4) is formed in one end, far away from the embedding section (12), of the clamping section (11), a second conductive insert (8) abutted against the metal tube (4) is arranged in the electrical interface groove (111) in a fit mode, and internal threads are formed in the inner side wall of the second conductive insert (8).
9. A method for testing the electrical performance of a cable intermediate joint is characterized by comprising the following steps:
the method comprises the following steps: keeping the middle joint (7) horizontal and fixed, simultaneously inserting the two test rods (1) of any one of claims 2-7 into two ends of the middle joint (7), and continuously inflating the metal tube (4) through the electric interface groove (111) in the inserting process until the positioning step (14) is abutted with the port of the middle joint (7);
step two: after gas in the middle joint (7) is exhausted through the electric interface groove (111), the metal tube (4) is connected with voltage to perform electric performance test;
step three: after the electrical performance test is finished, the voltage is removed, the metal tube (4) is grounded, the metal tube (4) is inflated through the electrical interface groove (111) again, the two test rods (1) are sequentially pulled out, so that the two test rods (1) are withdrawn from 70% -80% at first, and then the two test rods (1) are all pulled out of the middle joint (7) at the same time.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811251785.4A CN110007179B (en) | 2018-10-25 | 2018-10-25 | Cable intermediate joint electrical performance testing tool and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811251785.4A CN110007179B (en) | 2018-10-25 | 2018-10-25 | Cable intermediate joint electrical performance testing tool and method |
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| CN110007179A CN110007179A (en) | 2019-07-12 |
| CN110007179B true CN110007179B (en) | 2021-04-30 |
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| CN112161882A (en) * | 2020-08-25 | 2021-01-01 | 浙江盛洋科技股份有限公司 | Accelerated anti-fatigue cable testing process |
| CN114156672B (en) * | 2021-09-29 | 2024-02-23 | 国网山东省电力公司潍坊供电公司 | Expansion type plug-in extension rod for cable connector |
Citations (15)
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Denomination of invention: A testing fixture and method for electrical performance of cable intermediate joints Effective date of registration: 20231017 Granted publication date: 20210430 Pledgee: Zhejiang Tailong Commercial Bank Co.,Ltd. Ningbo Yinzhou Branch Pledgor: Ningbo dongzhijie Power Technology Co.,Ltd. Registration number: Y2023980061353 |
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