CN216718500U

CN216718500U - High tension cable outdoor termination stress cone electrical test device

Info

Publication number: CN216718500U
Application number: CN202123067208.XU
Authority: CN
Inventors: 刘浩; 张宝; 刘建国
Original assignee: SHANDONG TAIKAI CABLE CO Ltd
Current assignee: SHANDONG TAIKAI CABLE CO Ltd
Priority date: 2021-12-08
Filing date: 2021-12-08
Publication date: 2022-06-10
Anticipated expiration: 2031-12-08

Abstract

The utility model discloses an electrical test device for a stress cone of an outdoor terminal of a high-voltage cable, which relates to the technical field of electrical test equipment and comprises the following components: the test device comprises a closed test cavity, insulating gas is filled in the test cavity, an insulating layer is arranged outside the test cavity, the inside of the insulating layer is tightly attached to the outer wall of the test cavity, and a test cable and a tested object are arranged in the test cavity. The device wholly adopts the totally enclosed formula structure, and cable and tested article setting are in sealed test cavity, and inside packing insulating gas, the outside insulating layer that sets up of test cavity, the effectual reliability of guaranteeing external insulation has effectively avoided the outside flashover problem that withstand voltage in-process probably appears, has avoided the possibility of device local discharge itself, and then has improved the experimental accuracy of local discharge.

Description

High tension cable outdoor termination stress cone electrical test device

Technical Field

The utility model relates to the technical field of electrical test equipment, in particular to an electrical test device for a stress cone of an outdoor terminal of a high-voltage cable.

Background

The cable accessories with the voltage class of 66kV and above need to be subjected to partial discharge, voltage resistance and impact tests when leaving factory to detect whether the product has manufacturing defects or not, and the test ensures that the product can be qualified to leave factory after no breakdown or flashover. The current universal test method is that the cable is stripped of an outer semi-conducting layer with a certain length, a tested piece is directly sleeved on the main insulation of the cable for testing, and the outer insulation is ensured only by air distance.

The above test requires stripping of longer test cables to ensure the necessary insulation distance for high voltage grade products. In addition, because the external insulation only depends on the insulation performance of air, the external flashover of the test device is easily caused in the occasions with lightning impulse or high environmental humidity, and because the existing test device is of an open structure, the air ionization is easily caused under the action of high field intensity to cause partial discharge, so that the test accuracy of the partial discharge is influenced.

Disclosure of Invention

In order to solve the technical problems, the utility model provides the following technical scheme:

in a first aspect, an embodiment of the present invention provides an electrical test apparatus for a stress cone of an outdoor terminal of a high-voltage cable, including: the test device comprises a closed test cavity, insulating gas is filled in the test cavity, an insulating layer is arranged outside the test cavity, the inside of the insulating layer is tightly attached to the outer wall of the test cavity, and a test cable and a tested object are arranged in the test cavity.

Adopt above-mentioned implementation, the device wholly adopts totally enclosed formula structure, and cable and tested article setting are in sealed test cavity, and inside packing insulating gas, the outside insulating layer that sets up of test cavity has effectually guaranteed the reliability of external insulation, has effectively avoided the outside flashover problem that withstand voltage in-process probably appears, has avoided the possibility of device local discharge itself, and then has improved the experimental accuracy of local discharge.

In combination with the first aspect, in a first possible implementation manner of the first aspect, the test cavity includes an insulating sleeve, a top conductive sealing hardware fitting and a bottom conductive sealing hardware fitting are respectively disposed at two ends of the insulating sleeve, and the top conductive sealing hardware fitting is electrically connected with the test high-voltage power supply end. The top and the bottom are provided with the sealing hardware fittings, the sealing performance of the insulating sleeve is realized, and the top sealing hardware fittings are conductive sealing hardware fittings, so that the high-voltage electricity for the test is ensured to enter the insulating sleeve through the top. The bottom sealing hardware fitting is reserved with a mounting hole, so that the device is conveniently fixed on a test platform.

With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the top conductive sealing hardware includes a first sealing cover plate fixedly disposed on the top of the insulating sleeve, and a high-voltage electrode is disposed on the first sealing cover plate and is electrically connected to the test cable and the test high-voltage power supply terminal respectively.

With reference to the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, a shielding cover is further disposed on the top of the insulating sleeve, and the first sealing cover plate and the high-voltage electrode are both disposed in the shielding cover. The arrangement of the shielding cover enables the high-voltage electrode arranged on the first sealing cover plate to reduce external influence when the high-voltage electrode is connected with a high-voltage power supply.

With reference to the second or third possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, a conductive rod is disposed between the high-voltage electrode and the test cable, the conductive rod is disposed in the insulating sleeve, and two ends of the conductive rod are electrically connected to the high-voltage electrode and the test cable, respectively.

With reference to the second possible implementation manner of the first aspect, in a fifth possible implementation manner of the first aspect, the bottom sealing hardware fitting includes a second sealing cover plate, the second sealing cover plate is fixedly connected to the bottom end of the insulating sleeve, a fixing rod is disposed on the second sealing cover plate, the fixing rod penetrates through the second sealing cover plate, a first end of the fixing rod is connected to the test cable, and a second end of the fixing rod is disposed on a fixing clamp. The test cable is fixed on the fixing rod, and the fixing fixture realizes the fixation of the fixing rod, so that the test cable is reliably fixed.

With reference to the fifth possible implementation manner of the first aspect, in a sixth possible implementation manner of the first aspect, the second sealing cover plate is further provided with an insulating gas supplementing hole, the insulating gas supplementing hole is provided with a gas supplementing pipeline, and the gas supplementing pipeline is communicated with the gas supplementing device. And according to the test requirement or the insulating gas in the insulating sleeve does not meet the test standard, the gas is supplemented into the insulating sleeve by the gas supplementing device.

With reference to the sixth possible implementation manner of the first aspect, in a seventh possible implementation manner of the first aspect, the gas supplementing device includes a gas storage tank, a gas outlet port of the gas storage tank is communicated with the gas supplementing pipeline, and the gas supplementing pipeline is provided with a gas density relay. The gas density relay can detect the gas pressure in the sleeve, and the gas is supplemented when the pressure is lower than a set value.

With reference to the first aspect or the sixth or seventh possible implementation manner of the first aspect, in an eighth possible implementation manner of the first aspect, the insulating gas includes SF6 gas. The breakdown voltage of SF6 gas is 2.5 times of that of air, and SF6 gas is used as a test gas medium, so that the gas has good electrical insulation performance and excellent arc extinguishing performance.

With reference to the first aspect, in a ninth possible implementation manner of the first aspect, the insulating layer is a silicon rubber shed. The test cavity body composed of the internal insulating sleeve and the external silicon rubber umbrella skirt ensures the external air gap and the creepage distance, and can greatly save the required test cable length.

Drawings

Fig. 1 is a schematic structural diagram of an electrical testing apparatus for a stress cone of an outdoor terminal of a high-voltage cable according to an embodiment of the present invention;

in fig. 1, the symbols are represented as:

1-insulating layer, 2-test cable, 3-tested object, 4-insulating sleeve, 5-first sealing cover plate, 6-high-voltage electrode, 7-shielding cover, 8-conducting rod, 9-second sealing cover plate, 10-fixing rod, 11-fixing clamp, 12-gas supplementing pipeline, 13-gas storage box and 14-gas density relay.

Detailed Description

The scheme is explained in the following by combining the attached drawings and the detailed description.

Fig. 1 is a schematic structural diagram of an electrical test device for a stress cone of an outdoor terminal of a high-voltage cable according to an embodiment of the present invention, and referring to fig. 1, the electrical test device for the stress cone of the outdoor terminal of the high-voltage cable according to the embodiment of the present invention includes: the test chamber comprises a closed test chamber body, wherein the test chamber body is filled with insulating gas, and the insulating gas comprises SF6 gas. The breakdown voltage of SF6 gas is 2.5 times of that of air, and SF6 gas is used as a test gas medium, so that the gas has good electrical insulation performance and excellent arc extinguishing performance.

The external portion of experimental cavity sets up insulating layer 1, the inside of insulating layer 1 with the outer wall of experimental cavity is closely laminated, and experimental cable 2 and 3 settings of being tested are in the experimental cavity. The insulating layer 1 is a silicon rubber umbrella skirt. The test cavity body composed of the inner insulating sleeve 4 and the outer silicon rubber umbrella skirt ensures the outer air gap and the creepage distance, and can greatly save the length of the required test cable 2.

The device wholly adopts the totally enclosed formula structure, and cable and tested article 3 set up in sealed test cavity, and inside packing insulating gas, test cavity outside set up insulating layer 1, the effectual reliability of guaranteeing external insulation has effectively avoided the outside flashover problem that withstand voltage in-process probably appears, has avoided the possibility of device local discharge itself, and then has improved the experimental accuracy of local discharge.

In this embodiment, the test cavity includes insulating sleeve 4, insulating sleeve 4 both ends are provided with the electrically conductive sealed gold utensil in top and the sealed gold utensil in bottom respectively, the electrically conductive sealed gold utensil in top is connected with test high voltage power supply end electricity. The top and the bottom are provided with the sealing hardware fittings, the sealing performance of the insulating sleeve 4 is realized, and the top sealing hardware fittings are conductive sealing hardware fittings, so that the high-voltage electricity for the test is ensured to enter the insulating sleeve 4 through the top. The bottom sealing hardware fitting is reserved with a mounting hole, so that the device is conveniently fixed on a test platform.

Further, the top conductive sealing hardware fitting comprises a first sealing cover plate 5 fixedly arranged at the top of the insulating sleeve 4, a high-voltage electrode 6 is arranged on the first sealing cover plate 5, and the high-voltage electrode 6 is respectively electrically connected with the test cable 2 and the test high-voltage power supply end.

The top of the insulating sleeve 4 is also provided with a shielding case 7, and the first sealing cover plate 5 and the high-voltage electrode 6 are arranged in the shielding case 7. The shielding cover 7 is arranged to reduce the external influence when the high-voltage electrode 6 arranged on the first sealing cover plate 5 is connected to a high-voltage power supply. A conducting rod 8 is arranged between the high-voltage electrode 6 and the test cable 2, the conducting rod 8 is arranged in the insulating sleeve 4, and two ends of the conducting rod 8 are respectively electrically connected with the high-voltage electrode 6 and the test cable 2.

The bottom sealing hardware fitting comprises a second sealing cover plate 9, the second sealing cover plate 9 is fixedly connected with the bottom end of the insulating sleeve 4, a fixing rod 10 is arranged on the second sealing cover plate 9, the fixing rod 10 penetrates through the second sealing cover plate 9, the first end of the fixing rod 10 is connected with the test cable 2, and the second end of the fixing rod 10 is arranged on a fixing clamp 11. The test cable 2 is fixed on the fixing rod 10, and the fixing clamp 11 fixes the fixing rod 10, so that the test cable 2 is reliably fixed.

In this embodiment, the second sealing cover plate 9 is further provided with an insulating gas supplementing hole, the insulating gas supplementing hole is provided with a gas supplementing pipeline 12, and the gas supplementing pipeline 12 is communicated with a gas supplementing device. According to the requirement of the test or the insulating gas in the insulating sleeve 4 does not meet the standard of the test, the air is supplemented into the insulating sleeve 4 by the air supplementing device.

The air supplementing device comprises an air storage tank 13, an air outlet port of the air storage tank 13 is communicated with the air supplementing pipeline 12, and an air density relay 14 is arranged on the air supplementing pipeline 12. The gas density relay 14 can detect the gas pressure in the casing, and the pressure is lower than the set value for gas supplement.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Claims

1. The utility model provides an electric test device of high tension cable outdoor termination stress cone which characterized in that includes: the test device comprises a closed test cavity, wherein insulating gas is filled in the test cavity, an insulating layer is arranged outside the test cavity, the inside of the insulating layer is tightly attached to the outer wall of the test cavity, and a test cable and a tested product are arranged in the test cavity; the test cavity comprises an insulating sleeve, a top conductive sealing hardware fitting and a bottom sealing hardware fitting are arranged at two ends of the insulating sleeve respectively, and the top conductive sealing hardware fitting is electrically connected with a high-voltage power supply end; the top conductive sealing hardware fitting comprises a first sealing cover plate fixedly arranged at the top of the insulating sleeve, and a high-voltage electrode is arranged on the first sealing cover plate and is respectively and electrically connected with the test cable and the test high-voltage power supply end; the top of the insulating sleeve is also provided with a shielding case, and the first sealing cover plate and the high-voltage electrode are arranged in the shielding case.

2. The electrical testing device for the stress cone of the outdoor terminal of the high-voltage cable as recited in claim 1, wherein a conductive rod is disposed between the high-voltage electrode and the test cable, the conductive rod is disposed in the insulating sleeve, and two ends of the conductive rod are electrically connected to the high-voltage electrode and the test cable respectively.

3. The electrical testing device for the stress cone of the outdoor terminal of the high-voltage cable as claimed in claim 1, wherein the bottom sealing hardware comprises a second sealing cover plate, the second sealing cover plate is fixedly connected with the bottom end of the insulating sleeve, a fixing rod is arranged on the second sealing cover plate, the fixing rod penetrates through the second sealing cover plate, a first end of the fixing rod is connected with the test cable, and a second end of the fixing rod is arranged on a fixing clamp.

4. The electrical test device for the stress cone of the outdoor terminal of the high-voltage cable as claimed in claim 3, wherein the second sealing cover plate is further provided with an insulating gas supplementing hole, and the insulating gas supplementing hole is provided with a gas supplementing pipeline which is communicated with a gas supplementing device.

5. The electrical test device for the stress cone of the outdoor terminal of the high-voltage cable as claimed in claim 4, wherein the air supplement device comprises an air storage tank, an air outlet port of the air storage tank is communicated with the air supplement pipeline, and a gas density relay is arranged on the air supplement pipeline.

6. The high voltage cable outdoor termination stress cone electrical test apparatus of claim 1, or 4 or 5, wherein said insulating gas comprises SF6 gas.

7. The electrical test device for the stress cone of the outdoor terminal of the high-voltage cable as recited in claim 1, wherein the insulating layer is a silicon rubber shed.