CN215641606U - Formula cable test terminal is held tightly to atmospheric pressure - Google Patents
Formula cable test terminal is held tightly to atmospheric pressure Download PDFInfo
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- CN215641606U CN215641606U CN202120508789.7U CN202120508789U CN215641606U CN 215641606 U CN215641606 U CN 215641606U CN 202120508789 U CN202120508789 U CN 202120508789U CN 215641606 U CN215641606 U CN 215641606U
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Abstract
The utility model discloses an air pressure holding type cable test terminal which comprises an outer pipe body and a rubber pipe nested in the outer pipe body; the peripheral parts of the two ends of the outer tube body are fixedly connected with the peripheral parts of the two ends of the rubber tube respectively, and a gap is formed between the outer side wall of the rubber tube and the inner side wall of the outer tube body, so that a closed cavity capable of containing insulating gas is formed between the rubber tube and the outer tube body; the outer tube body is provided with an air vent communicated with the closed cavity, and the air vent is connected with a vent valve; the rubber tube is internally embedded with a stress cone or a stress tube. The utility model realizes the cable test by adopting gas as an insulating medium, does not need transformer oil, avoids the pollution of a test site, reduces the test cost brought by the waste of the tail end of the cable, and can simplify the operation of the cable test process.
Description
Technical Field
The utility model relates to the technical field of cable performance tests, in particular to an air pressure tightly-holding type cable test terminal.
Background
The national standard "GB/T12706.3-2008 rated voltage 1kV (Um =1.2 kV) to 35kV (Um =40.5 kV) extruded insulated power cables and accessories part 3: rated voltage 35kV (Um =40.5 kV) cable "routine tests for cable were conducted under 3.5U 0 withstand voltage for 5min or 2.5U0 withstand voltage for 30min, and 1.73U 0 for partial discharge tests. The electric field distribution at the tail end of the cable is more complex than that in the cable body due to the discontinuity of materials, the electric field intensity at the edge of the insulation shielding is obviously enhanced, and the phenomena of corona, flashover or cable breakdown and the like can occur when the voltage is increased. In order to solve the problems, the medium-voltage cable is subjected to withstand voltage and partial discharge tests by adopting an oil cup, before the tests, the insulating shielding layer of the cable is stripped to a certain length, then the tail end of the cable is immersed into the oil cup filled with transformer oil, so that the transformer oil does not cover the insulating shielding fracture of the cable, and then the withstand voltage and partial discharge tests are carried out.
However, the above test methods still have some disadvantages, one is that the transformer oil is easily polluted and wetted during the test, which causes the failure of the withstand voltage and partial discharge test, so the transformer oil needs to be replaced frequently, or the transformer oil is purified and dried, the former causes the waste of the transformer oil, and the latter brings inconvenience to the test. Secondly, in the process of replacing the test sample, the use of the transformer oil is easy to cause ground oil stain, so that the test site does not meet the requirements of an environment management system. And thirdly, the cable end needs to be removed from the finished cable after the cable is routinely tested, and the overlong cable end causes economic loss.
Disclosure of Invention
The utility model aims to provide an air pressure holding type cable test terminal which can simplify the operation of a cable test process, does not need transformer oil, avoids the pollution of a test site and reduces the test cost brought by the waste of the tail end of a cable.
The technical scheme adopted by the utility model is as follows: an air pressure holding type cable test terminal comprises an outer pipe body and a rubber pipe nested in the outer pipe body;
the peripheral parts of the two ends of the outer tube body are fixedly connected with the peripheral parts of the two ends of the rubber tube respectively, and a gap is formed between the outer side wall of the rubber tube and the inner side wall of the outer tube body, so that a closed cavity capable of containing insulating gas is formed between the rubber tube and the outer tube body;
the outer tube body is provided with an air vent communicated with the closed cavity, and the air vent is connected with a vent valve;
the rubber tube is internally embedded with a stress cone or a stress tube.
When the device is applied, the end part of the tested cable with the insulation shielding layer removed can be placed into the rubber tube, and then the rubber tube is tightly held on the tested cable together with the stress cone or the stress tube by introducing the insulation gas into the closed cavity. After the test is started, the stress tube or cone will exert the ability of electric field distribution control, so that the electric field distribution of the cable termination is within an acceptable range.
Optionally, the pneumatic clasping type cable test terminal further comprises a voltage-equalizing ring electrically connected with the tail end conductor of the tested cable. The grading ring can be used for preventing the influence of the discharge of the tail end of the cable on the test, and the specific installation form can refer to the prior art.
Optionally, in a test state, insulating gas is filled in the closed cavity; the insulating gas is nitrogen or dry air.
Optionally, the air pressure clasping type cable test terminal further comprises a base and an upper cover made of metal materials, and the base and the upper cover are fixedly arranged at two ends of the outer pipe body and the two ends of the rubber pipe respectively; the center positions of the base and the upper cover are respectively provided with a cable hole.
Optionally, the diameter of the cable hole and the inner diameter of the rubber tube are slightly larger than the outer diameter of the insulating layer of the cable to be tested. The device can be conveniently mounted and dismounted in the test.
Optionally, the outer tube body comprises an insulating tube and a metal tube which are coaxially butted and have the same inner diameter, and the length of the insulating tube is far greater than that of the metal tube; the lower end of the metal tube is fixedly connected with the base, and the upper end of the insulating tube is fixedly connected with the upper cover;
the lower end of the stress tube or the stress cone is higher than the upper end of the metal tube;
the air vent is arranged on the wall of the metal pipe.
Above scheme, the setting of tubular metal resonator can make things convenient for the installation of breather valve, then can ensure the insulating nature of rubber tube periphery with the shortest as far as possible of tubular metal resonator design. Meanwhile, the stress tube or the stress cone is arranged at a position higher than the upper end of the metal tube, namely, the stress cone or the stress tube is arranged in the insulating tube but not in the metal tube, so that the phenomenon that the tail end of the cable discharges the metal tube at first can be prevented, and meanwhile, the electric field distribution control performance of the stress cone is guaranteed.
Optionally, the insulating tube is made of glass fiber impregnated epoxy resin, and insulating paint is coated on the surface of the insulating tube; the rubber tube is made of ethylene propylene diene monomer or silicon rubber; the high-dielectric-constant rubber material is ethylene propylene diene monomer or silicon rubber.
Optionally, a first extension portion is arranged between the circumferential portions at the two ends of the rubber tube and the axial tube portion of the rubber tube in an L shape, and the outer end of the first extension portion is fixedly clamped between the base and the wall of the outer tube body or between the upper cover and the wall of the outer tube body. The sealing performance of the closed air chamber can be guaranteed.
Optionally, a second external extension part is arranged between the peripheral parts of the two ends of the outer tube body and the axial tube part of the outer tube body in an L shape, and the second external extension part is fixedly connected with the upper cover or the base;
the outer end of the first outer extension portion extends to a position between the second outer extension portion and the upper cover or the base. The fixed connection can adopt a bolt connection mode, and threads penetrate through the base/upper cover, the first extending portion and the second extending portion at the same time, so that the structure is simplified.
Advantageous effects
According to the air pressure holding type cable test terminal, the air is used as an insulating medium to test the cable, so that the use of transformer oil is avoided, the transformer oil does not need to be treated, and the pollution problem of a test site is avoided; and the test operation process is simple and convenient, excessive occupation of the tail end of the cable is not needed, and the test cost brought by the removal of the tested tail end of the cable after the test can be saved.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a pneumatic hugging type cable test terminal according to the present invention;
fig. 2 is a schematic structural diagram of a second embodiment of the pneumatic hugging-type cable test terminal according to the present invention;
in the figure, 01-tested cable conductor, 02-tested cable insulation shielding layer, 1-base, 2-upper cover, 3-insulation pipe, 31-second extension part, 4-metal pipe, 41-vent valve, 5-rubber pipe, 51-stress cone, 52-stress pipe, 53-first extension part, 6-insulation gas and 7-equalizing ring.
Detailed Description
The following further description is made in conjunction with the accompanying drawings and the specific embodiments.
The utility model has the technical conception that the gas is adopted to replace the transformer oil as the insulating medium to realize the test of the cable, and the electric field distribution control in the cable test process is realized by combining the rubber material with high dielectric constant, the stress cone or the stress tube.
With reference to fig. 1 and 2, the main technical solution of the present invention is designed as follows: the air pressure holding type cable test terminal comprises an outer pipe body and a rubber pipe 5 nested in the outer pipe body;
the peripheral parts of the two ends of the outer tube body are fixedly connected with the peripheral parts of the two ends of the rubber tube respectively, and a gap is formed between the outer side wall of the rubber tube and the inner side wall of the outer tube body, so that a closed cavity capable of containing insulating gas is formed between the rubber tube and the outer tube body;
the outer tube body is provided with an air vent communicated with the closed cavity, and the air vent is connected with an air vent valve 41;
the rubber tube 5 is embedded with a stress cone 51 or a stress tube 52. The stress cone, the stress tube and the rubber tube are coaxially arranged.
When the device is used, the end part of the tested cable with the insulation shielding layer removed can be placed into the rubber tube, and then the rubber tube is connected with the internal stress cone or the stress tube to be tightly held on the tested cable by introducing insulation gas into the closed cavity. After the test is started, the stress tube or cone will exert the ability of electric field distribution control, so that the electric field distribution of the cable termination is within an acceptable range.
Example 1
In the embodiment shown in fig. 1, the pneumatic tightly-holding type cable testing terminal comprises an outer tube body, a rubber tube, a base 1, an upper cover 2 and a grading ring 7, wherein a stress cone 51 is embedded in the rubber tube to control electric field distribution in the testing process.
The base 1 and the upper cover 2 are respectively and fixedly arranged at the upper end and the lower end of the outer pipe body and the rubber pipe 5; the center positions of the base and the upper cover are respectively provided with a cable hole. The diameter of the cable hole and the inner diameter of the rubber tube are slightly larger than the outer diameter of the insulating layer of the tested cable. The device can be conveniently mounted and dismounted in the test.
The outer tube body comprises an insulating tube 3 and a metal tube 4 which are coaxially butted and have the same inner diameter, and the length of the insulating tube is far greater than that of the metal tube; the lower end of the metal tube 4 is fixedly connected with the base 1, and the upper end of the insulating tube 3 is fixedly connected with the upper cover 2. The lower end of the stress tube or stress cone is higher than the upper end of the metal tube. The air vent is arranged on the wall of the metal tube.
The periphery of rubber tube both ends respectively with be the L type between the rubber tube axial pipe portion and be provided with first epitaxial portion 51, the outer end fixation clamp of first epitaxial portion is located between base 1 and the 4 pipe walls of tubular metal resonator, perhaps between upper cover 2 and the 3 pipe walls of insulating tube, and is equipped with the clearance between rubber tube lateral wall and the outer body inside wall for form the closed cavity that can the holding insulating gas 6 between rubber tube and the outer body, and can ensure the leakproofness of closed air chamber.
Two ends of the outer tube body, namely the upper end of the insulating tube 3 and the lower end of the metal tube 4, are respectively provided with a second external extension part 31 in an L shape between the peripheries of the two and the axial tube part of the outer tube body, and the second external extension part 31 is fixedly connected with the upper cover 2 or the base 1; and the outer end of the first extension portion 53 extends to between the second extension portion 31 and the upper cover 2 or the base 1. The fixed connection can be in the form of a bolt connection, and the bolt connection penetrates through the base/upper cover, the first extending portion and the second extending portion at the same time, so that the structure is simplified.
In the embodiment, the insulating tube is made of glass fiber impregnated epoxy resin, and insulating paint is coated on the surface of the insulating tube; the rubber tube is made of ethylene propylene diene monomer or silicon rubber.
The stress cone may be made using known techniques. The basic principle of the embodiment that the stress cone is adopted to realize the electric field distribution control is that the electric field distribution is controlled by adopting a geometric shape, and the rubber tube embedded with the stress cone is tightly pressed on the insulating surface of the tail end of the cable through high-pressure gas so as to control the electric field distribution of the cable test terminal within an acceptable range.
The experimental procedure using this example was: the insulation shielding layer of the tail end 01 of the cable in a certain length is removed firstly, the insulation shielding layer is polished smoothly, then the test terminal of the embodiment is sleeved on the tail end of the cable, the grading ring is connected with a conductor of the tail end 01 of the cable, then the rubber tube is tightly held on the cable through inflation of the vent valve, high-pressure gas is discharged after the test is finished, the rubber tube retracts, and the test terminal can be taken down from the cable at the moment. The test process is convenient and simple to operate, pollution-free and low in cost.
Example 2
Referring to fig. 2, this embodiment is based on the same concept as embodiment 1, and different from embodiment 1, a stress tube 52 is embedded in the rubber tube to control the electric field distribution during the test.
The stress tube may be of the prior art. The basic principle of the present embodiment for realizing electric field distribution control by using the stress tube is as follows: the distribution of an electric field is controlled by adopting material parameters, and the rubber tube embedded with the high-dielectric constant stress tube is tightly pressed on the insulating surface at the tail end of the cable through high-voltage insulating gas so as to control the distribution of the electric field of the cable test terminal within an acceptable range.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the utility model as defined in the appended claims.
Claims (9)
1. An air pressure holding type cable test terminal is characterized by comprising an outer pipe body and a rubber pipe nested in the outer pipe body;
the peripheral parts of the two ends of the outer tube body are fixedly connected with the peripheral parts of the two ends of the rubber tube respectively, and a gap is formed between the outer side wall of the rubber tube and the inner side wall of the outer tube body, so that a closed cavity capable of containing insulating gas is formed between the rubber tube and the outer tube body;
the outer tube body is provided with an air vent communicated with the closed cavity, and the air vent is connected with a vent valve;
the rubber tube is internally embedded with a stress cone or a stress tube.
2. The pneumatic hugging cable test terminal according to claim 1, further comprising a grading ring for electrically connecting to a terminal conductor of a cable under test.
3. The pneumatic hugging-type cable test terminal according to claim 1, wherein in a test state, the closed chamber is filled with an insulating gas; the insulating gas is nitrogen or dry air.
4. The pneumatic tightly-holding type cable test terminal according to claim 1, further comprising a base and an upper cover made of metal, wherein the base and the upper cover are respectively and fixedly arranged at two ends of the outer tube body and the rubber tube; the center positions of the base and the upper cover are respectively provided with a cable hole.
5. The pneumatic hugging type cable test terminal according to claim 4, wherein the diameter of the cable hole and the inner diameter of the rubber tube are slightly larger than the outer diameter of the insulation layer of the tested cable.
6. The air pressure clasping type cable test terminal as claimed in claim 4 or 5, wherein a first extension portion is arranged between the circumferential portions of the two ends of the rubber tube and the axial tube portion of the rubber tube in an L shape, and the outer end of the first extension portion is fixedly clamped between the base and the wall of the outer tube body or between the upper cover and the wall of the outer tube body.
7. The air pressure clasping type cable test terminal as claimed in claim 6, wherein a second extension part is arranged between the peripheral parts of the two ends of the outer tube body and the axial tube part of the outer tube body in an L shape, and the second extension part is fixedly connected with the upper cover or the base;
the outer end of the first extending portion extends to the position between the second extending portion and the upper cover or the base, the fixed connection can adopt a bolt connection mode, and threads penetrate through the base/the upper cover, the first extending portion and the second extending portion like the same time, so that the structure is simplified.
8. The pneumatic hugging cable test terminal according to any one of claims 1 to 5, wherein the outer tube body comprises an insulating tube and a metal tube which are coaxially butted and have the same inner diameter, and the length of the insulating tube is much longer than that of the metal tube; the lower end of the metal tube is fixedly connected with the base, and the upper end of the insulating tube is fixedly connected with the upper cover;
the lower end of the stress tube or the stress cone is higher than the upper end of the metal tube;
the air vent is arranged on the wall of the metal pipe.
9. The pneumatic hugging type cable test terminal according to claim 8, wherein the insulation tube is made of glass fiber impregnated epoxy resin, and the surface of the insulation tube is coated with insulation paint; the rubber tube is made of ethylene propylene diene monomer or silicon rubber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120508789.7U CN215641606U (en) | 2021-03-10 | 2021-03-10 | Formula cable test terminal is held tightly to atmospheric pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120508789.7U CN215641606U (en) | 2021-03-10 | 2021-03-10 | Formula cable test terminal is held tightly to atmospheric pressure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215641606U true CN215641606U (en) | 2022-01-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120508789.7U Active CN215641606U (en) | 2021-03-10 | 2021-03-10 | Formula cable test terminal is held tightly to atmospheric pressure |
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| Country | Link |
|---|---|
| CN (1) | CN215641606U (en) |
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2021
- 2021-03-10 CN CN202120508789.7U patent/CN215641606U/en active Active
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