CN215526003U - Test device for power cable accessory - Google Patents
Test device for power cable accessory Download PDFInfo
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- CN215526003U CN215526003U CN202120557715.2U CN202120557715U CN215526003U CN 215526003 U CN215526003 U CN 215526003U CN 202120557715 U CN202120557715 U CN 202120557715U CN 215526003 U CN215526003 U CN 215526003U
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Abstract
The utility model belongs to the technical field of power cables, and provides a test device for power cable accessories, which aims to solve the technical problems that the existing power cable accessories need to be connected with GIS (geographic information system) switch equipment and a power transformer together for conducting an insulation test, and the electrical performance of the power cable accessories cannot be completely tested, and comprises: the high-voltage cable comprises a high-voltage lead, a sleeve external shielding assembly, an air sleeve, a sleeve conductor, a sleeve internal shielding assembly, a conductor connecting piece electrically connected with the sleeve conductor, and a GIS terminal epoxy piece connected with a power cable accessory, wherein the conductor connecting piece is connected with the GIS terminal epoxy piece; the conductor connecting piece and the sleeve conductor positioned outside the air sleeve are respectively positioned inside the air tank; and the air sleeve and the air tank are respectively filled with insulating gas. Therefore, the field completion test of the cable line according to the test standard can be realized independently.
Description
Technical Field
The utility model relates to the technical field of power cables, in particular to a power cable accessory electric test device, and specifically relates to a special device for electric test of power cables and power cable accessories.
Background
The power cable is an important power element applied to a power system, and is widely used due to the advantages of small influence of weather, high safety and reliability, concealment, durability, no influence on environment and the like. Along with the operation of a large number of power cables, the corresponding cable failure rate also rises along with the service life and the like, so that power failure accidents and huge economic losses are caused. In order to ensure the power supply reliability, the detection of the operating conditions and the health degree of the newly-built and laid cables is particularly important, especially in the non-destructive test of on-site off-line detection. The method is an important means for finding out hidden troubles of faults, predicting the service life and ensuring the safe and reliable operation of the power cable through electric tests.
In actual power engineering, cables are often used for connecting gas insulated metal enclosed switchgear (GIS) and power transformers, insulation tests are required for high-voltage products after the products are installed, and because the test standards of cable accessories, GIS switches and power transformers are different, users and manufacturers are often required to coordinate to obtain a test scheme which can be accepted by all parties.
In addition, at present, when cable accessories are subjected to research tests, oil-filled cable terminals are mostly adopted as the voltage and current applying sides, the oil-filled cable terminals are installed more complexly, and the environment is polluted due to improper treatment of insulating oil.
SUMMERY OF THE UTILITY MODEL
The utility model provides an electric test device for a power cable accessory, which aims to solve the technical problems that the existing power cable accessory needs to be connected with GIS (geographic information system) switch equipment and a power transformer to perform an insulation test and cannot completely test the electrical performance of the power cable accessory.
The embodiment of the utility model provides an electric test device for a power cable accessory, which is characterized by comprising the following components:
the high-voltage lead is led in from the outside, the sleeve external shielding component is used for uniformly distributing high voltage on the sleeve, and the air sleeve is connected with the sleeve external shielding component;
the sleeve conductor is positioned in the air sleeve and is electrically connected with the high-voltage lead;
an in-sleeve shield assembly positioned within the air sleeve and outside the sleeve conductor;
the conductor connecting piece is electrically connected with the sleeve conductor, and the GIS terminal epoxy piece is connected with the power cable accessory; and
the conductor connecting piece and the sleeve conductor positioned outside the air sleeve are respectively positioned inside the air tank;
and the air sleeve and the air tank are respectively filled with insulating gas.
In a preferred embodiment of the present invention, the gas tank is perpendicular to the air bushing, the bushing conductor is perpendicular to the conductor connecting member, and the GIS terminal epoxy is located at one end of the gas tank.
In a further preferred embodiment of the present invention, a sealing cover plate is further disposed at the other end of the gas tank, and an inflation port is disposed on the sealing cover plate.
In a further preferred embodiment of the present invention, the sealing cover plate is further provided with a suction/inflation port, and the suction/inflation port is connected to an inflation valve.
In a preferred embodiment of the present invention, the power cable accessory testing apparatus further includes a terminal strip located between the high-voltage lead and the bushing conductor.
In a preferred implementation manner of the embodiment of the present invention, the insulating gas is sulfur hexafluoride.
In a preferred embodiment of the present invention, the sleeve conductor is constructed by a thin-walled metal circular tube.
In a preferred implementation manner of the embodiment of the utility model, the end part of the GIS terminal epoxy part is open, and the caliber size of the open end part is adjustable; the GIS terminal epoxy piece also comprises a fixing flange connected with the end part of the GIS terminal epoxy piece.
In a further preferred embodiment of the present invention, the fixing flange is detachably connected to an end of the GIS terminal epoxy.
In a preferred embodiment of the present invention, the power cable accessory test apparatus further includes: a support located below the air tank, the air sleeve being located above the air tank.
By adopting the technical scheme provided by the utility model, in the actual power engineering, the test voltage and the withstand voltage time of each power device are different, such as a power transformer, a GIS switch, a power cable and the like; the power cable line is connected through the GIS terminal epoxy part in the power cable accessory testing device, so that the field completion test can be independently carried out on the cable line according to the test standard, other power equipment can also carry out the electric test according to the test standard corresponding to the power equipment, and all power equipment in the project is ensured to be strictly subjected to the acceptance test according to the standard. Furthermore, the whole set of test device for the power cable accessories is connected in an assembling mode, and can be sent to a test site after being integrally assembled, so that the site workload is reduced. Moreover, the tool adopts inert gas sulfur hexafluoride as an insulating medium, and can be recycled through the inflation interface at the sealing cover plate, so that the environment is not polluted. Furthermore, the sleeve conductor in the electric test device for the power cable accessory adopts a thin-wall aluminum alloy pipe as a raw material, so that the current area is large, the conductor skin effect is small, the current capacity of equipment with higher current capacity is large and can reach 2000A, and the current capacity requirements of cables with various specifications are met.
Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model may be realized and attained by the structure and/or process particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
Fig. 1 is a schematic structural diagram of a power cable accessory test apparatus according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of an end portion of a power cable accessory test apparatus according to an embodiment of the present invention connected to a power cable accessory.
Fig. 3 is a schematic structural diagram of an inflation port and an inflation valve in an electrical testing apparatus for a power cable accessory according to an embodiment of the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be provided with reference to the drawings and examples, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented. It should be noted that the detailed description is only for the purpose of making the utility model easier and clearer for those skilled in the art, and is not intended to be a limiting explanation of the utility model; moreover, as long as there is no conflict, the embodiments and the features of the embodiments of the present invention may be combined with each other, and the technical solutions formed are all within the scope of the present invention.
Additionally, the steps illustrated in the flow charts of the drawings may be performed in a control system such as a set of controller-executable instructions and, although a logical ordering is illustrated in the flow charts, in some cases, the steps illustrated or described may be performed in an order different than that illustrated herein.
The technical scheme of the utility model is described in detail by the figures and the specific embodiments as follows:
examples
The existing power cable accessory performs an electric test and has the following defects:
1. in engineering application, cable accessories, GIS switching equipment and power transformers are connected together to perform insulation tests, and the electrical performance of each power equipment cannot be completely checked. 2. The installation process of the oil-filled cable terminal is complex and is easy to cause pollution. 3. The current capacity of the oil-filled cable termination depends on the cable specification and is less versatile during research tests near the cable.
Therefore, in order to solve the technical problems that the existing power cable accessory needs to be connected with GIS (geographic information system) switching equipment and a power transformer to perform an insulation test and cannot completely test the electrical performance of the power cable accessory, the embodiment of the utility model provides the power test device for the power cable accessory, which has high through-current capacity and is suitable for the electrical test of cable loops and cable accessories of various specifications. Therefore, each power device in the power engineering line can be subjected to on-site handover test according to the standard, and the insulation performance of the power device can be completely checked. Meanwhile, the testing device for the power cable accessory can replace an oil-filled cable terminal to test the conduction performance of the cable accessory.
Specifically, as shown in fig. 1 and 3, the present embodiment provides a power cable accessory test apparatus including:
the high-voltage transformer comprises a high-voltage lead 1 for introducing high voltage from the outside, a sleeve outer shielding assembly 2 for uniformly distributing the high voltage on the sleeve, and an air sleeve 3 connected with the sleeve outer shielding assembly.
High-voltage lead 1: the electric power cable accessory electric test device is used for introducing external high voltage into the electric power cable accessory electric test device.
The external shielding assembly of the bushing 2: the high voltage is uniformly distributed on the upper part of the sleeve, and no potential difference is ensured among all annular parts.
Air sleeve 3: the external insulator of the electric test device for the power cable accessory ensures the insulation strength between the high-voltage end and the zero potential part.
A bushing conductor 4 which is positioned in the air bushing and is electrically connected with the high-voltage lead;
an in-sleeve shield assembly 5 located inside the air sleeve and outside the sleeve conductor.
The bushing conductor 4: the device is used for transmitting voltage and current; the shield assembly inside the sleeve 5: the surface field intensity of the inner conductor is reduced, the surface potential distribution of the air sleeve is optimized, and the insulating property is ensured.
The connector comprises a conductor connecting piece 8 electrically connected with the sleeve conductor 4, a GIS terminal epoxy piece 10 connected with a power cable accessory, and a conductor connecting piece 8 connected with the GIS terminal epoxy piece 10;
conductor connecting member 8: connecting the inner sleeve conductor 4 of the test device for the power cable accessory and the GIS terminal epoxy piece 10; and the conductive segments that need to transmit voltage and current.
The air tank 9, the conductor connecting piece 8 and the sleeve conductor 4 positioned outside the air sleeve 3 (namely the part of the sleeve conductor 4 positioned outside the air sleeve 3) are respectively positioned inside the air tank 9;
the gas tank 9 is a protective inner conductor, and the inside is filled with a closed insulating gas such as sulfur hexafluoride gas.
The air jacket 3 and the gas tank 9 are filled with insulating gas, respectively.
By adopting the technical scheme provided by the utility model, in the actual power engineering, the test voltage and the withstand voltage time of each power device are different, such as a power transformer, a GIS switch, a power cable and the like; the power cable line is connected through the GIS terminal epoxy part in the power cable accessory testing device, so that the field completion test can be independently carried out on the cable line according to the test standard, other power equipment can also carry out the electric test according to the test standard corresponding to the power equipment, and all power equipment in the project is ensured to be strictly subjected to the acceptance test according to the standard.
In a preferred embodiment of this embodiment, the electric test apparatus for power cable accessories further comprises a terminal block located between the high-voltage lead and the bushing conductor. In addition, the external insulation of the air sleeve 3 is optimally designed, so that the external insulation performance is ensured to meet the standard, and the wiring row on the upper part of the air sleeve conductor is connected with the high-voltage lead 1.
As shown in fig. 1, in the preferred embodiment of this embodiment, the gas canister 9 is perpendicular to the air sleeve 3, the sleeve conductor 4 is perpendicular to the conductor connector 8, and the GIS terminal epoxy 10 is located at one end of the gas canister 9.
In a further preferred embodiment of this embodiment, the other end of the gas tank 9 is further provided with a sealing cover plate 6, and the sealing cover plate is provided with a gas filling opening.
Sealing cover 6 (with inflation port 12): for sealing the internal insulating gas.
In a further preferred embodiment of this embodiment, as shown in fig. 1 and 3, the sealing cover 6 is further provided with a suction/inflation port 7, and the suction/inflation port 7 is connected to an inflation valve 13. The air pumping and inflating port 7 is connected with an inflating valve 13, and the interior of the electric testing device for the power cable accessories is vacuumized and inflated. As shown in fig. 3, the inside of the gas tank 9 may be filled with an insulating gas through a gas filling port 12.
In a preferred embodiment of this embodiment, the insulating gas is sulfur hexafluoride. Therefore, sulfur hexafluoride gas is filled in the air sleeve 3 and the air tank 9 to be used as internal insulation, and the insulation performance of each part inside is ensured.
Therefore, in this embodiment, the whole set of test device for power cable accessories is connected in an assembly manner, and can be sent to a test site after being integrally assembled, so that the field workload is reduced. Moreover, the tool adopts inert gas sulfur hexafluoride as an insulating medium, and can be recycled through the inflation interface at the sealing cover plate, so that the environment is not polluted.
In a preferred embodiment of the present embodiment, the structure of the bushing conductor 4 is constructed using a thin-walled metal circular tube. And the GIS terminal is reliably connected with the GIS terminal through the conductor connecting piece 8, the sectional area of the conductor is large, and the skin effect is small, so that the GIS terminal has higher through-current capacity. Namely, the sleeve conductor in the electric test device for the power cable accessory adopts a thin-wall aluminum alloy pipe as a raw material, the through-flow area is large, the conductor skin effect is small, the through-flow capacity of equipment with higher through-flow capacity is large and can reach 2000A, and the through-flow requirements of cables with various specifications are met.
As shown in fig. 1, in a preferred embodiment of the present embodiment, the power cable accessory test apparatus further includes: a bracket 14 located below the air tank 9 and the air sleeve 4 located above the air tank 9. The in-line shield assembly 5 is also located above the gas canister 9.
It should be noted that the present embodiment is not limited to this, for example, the air bushing 4, the shielding assembly 5 inside the bushing, and the gas tank 9 may be respectively disposed in the same axial direction, instead of the perpendicular relationship in fig. 1, or the conductor connecting member 8 and the GIS terminal epoxy connection 10 may be connected in a perpendicular relationship, and these different embodiments may be different in structure according to specific engineering applications.
In the field completion test and the research test of the cable accessories, the power cable accessories 20 to be tested in the GIS cable terminal are connected to the GIS terminal epoxy 10 in the test device for power cable accessories provided in this embodiment, and then a voltage is applied through the upper portion of the bushing conductor.
As shown in fig. 2, in the preferred embodiment of this embodiment, the end of the GIS terminal epoxy 10 is open, and the size of the end aperture of the open end is adjustable; the GIS terminal epoxy 10 further comprises a fixing flange 11 connected to its end. The fixing flange 11 is detachably connected with the end part of the GIS terminal epoxy part 10, so that after one-time test is finished, other power cable accessories can be tested by loosening the fixing flange 11; the end part of the GIS terminal epoxy piece 10 is open, and the caliber size of the open end part is adjustable; therefore, the test of the power cable accessories with various specifications and sizes can be better met.
Specifically, in actual power engineering, test voltages and withstand voltage times of various power equipment are different, such as power transformers, GIS switches, power cables and the like. In the power cable line passes through this and the power cable for annex testing arrangement that this embodiment provided, GIS terminal epoxy 10 is connected, can realize carrying out on-the-spot completion test to cable line according to test standard alone, and other power equipment also can carry out the electricity test according to its test standard, ensure that all power equipment in the engineering strictly carry out the acceptance test according to the standard.
In the power cable accessory testing device provided by the embodiment, the whole set of device is connected in an assembling mode, and can be sent to a testing site after being integrally assembled, so that the field workload is reduced, in addition, the tool adopts inert gas sulfur hexafluoride as an insulating medium, can be recycled through the inflation interface 7 at the position of the sealing cover plate, and does not pollute the environment.
The assembly and use process of the electric test device for the power cable accessory comprises the following steps:
1. the power cables and power cable accessories are securely connected to the GIS epoxy as shown in figure 2.
2. The DN40/20 inflation valve is connected with the inflation port, the tool is vacuumized and filled with sulfur hexafluoride gas with rated pressure, and the process is shown in figure 3.
3. One end of the high voltage lead is connected to the upper part of the bushing conductor as shown in fig. 1.
4. And the tank body is grounded by using a grounding lead, the other end of the high-voltage lead is connected to voltage-resistant equipment, the voltage-resistant equipment is started, and the test is carried out according to the corresponding national standard test voltage and voltage-resistant time.
Finally, it should be understood that the above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Those skilled in the art can make many changes and simple substitutions to the technical solution of the present invention without departing from the technical solution of the present invention, and the technical solution of the present invention is protected by the following claims.
Claims (10)
1. An electric power cable accessory electricity testing apparatus, comprising:
the high-voltage lead is led in from the outside, the sleeve external shielding component is used for uniformly distributing high voltage on the sleeve, and the air sleeve is connected with the sleeve external shielding component;
the sleeve conductor is positioned in the air sleeve and is electrically connected with the high-voltage lead;
an in-sleeve shield assembly positioned within the air sleeve and outside the sleeve conductor;
the conductor connecting piece is electrically connected with the sleeve conductor, and the GIS terminal epoxy piece is connected with the power cable accessory; and
the conductor connecting piece and the sleeve conductor positioned outside the air sleeve are respectively positioned inside the air tank;
and the air sleeve and the air tank are respectively filled with insulating gas.
2. The apparatus of claim 1, wherein the gas canister is perpendicular to the air sleeve, the sleeve conductor is perpendicular to the conductor connection, and the GIS terminal epoxy is located at an end of the gas canister.
3. The device according to claim 2, wherein the other end of the gas tank is further provided with a sealing cover plate, and the sealing cover plate is provided with an inflation port.
4. The device of claim 3, wherein the sealing cover plate is further provided with a suction and inflation port, and the suction and inflation port is connected with an inflation valve.
5. The apparatus of claim 1, further comprising a termination block between the high voltage lead and the bushing conductor.
6. The apparatus of claim 1, wherein the insulating gas is sulfur hexafluoride.
7. The apparatus of claim 1 wherein the structure of the bushing conductor is constructed using a thin-walled metal round tube.
8. The apparatus of claim 1, wherein the GIS terminal epoxy is open ended and the open ended end is adjustable in caliber size; the GIS terminal epoxy piece also comprises a fixing flange connected with the end part of the GIS terminal epoxy piece.
9. The apparatus of claim 8, wherein the mounting flange is removably connected to an end of the GIS terminal epoxy.
10. The apparatus of claim 1, further comprising: a support located below the air tank, the air sleeve being located above the air tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120557715.2U CN215526003U (en) | 2021-03-17 | 2021-03-17 | Test device for power cable accessory |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120557715.2U CN215526003U (en) | 2021-03-17 | 2021-03-17 | Test device for power cable accessory |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215526003U true CN215526003U (en) | 2022-01-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120557715.2U Active CN215526003U (en) | 2021-03-17 | 2021-03-17 | Test device for power cable accessory |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215526003U (en) |
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2021
- 2021-03-17 CN CN202120557715.2U patent/CN215526003U/en active Active
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