35kV insulated cable line transition power supply device

Abstract

The utility model discloses a 35kV insulated cable line transition power supply device, which comprises a shell, an insulated gas box, a single-side sleeve, a conducting rod and a cable plugging device, an inner cavity of the shell is provided with an insulating gas box, and the gas box is filled with SF6 gas as an insulating medium; a barometer is arranged at one corner of the insulating gas tank; two single-side sleeves are arranged on the insulating gas box; two cable plugging devices are arranged on the shell; the two conducting rods are used for respectively connecting one group of corresponding single-side sleeves and the cable plugging device, and meanwhile, the conducting rods extend into the insulating gas tank and are communicated through the conducting connecting pieces. According to the assembly type transition cable device for the 35kV high-voltage distribution line, the SF6 gas box is adopted for insulation, the safety and reliability of a 35kV assembly type transition product are ensured, meanwhile, line loss is reduced, and the power transmission efficiency is improved; and gas insulation is adopted, so that the weight of the device is greatly reduced, and field power failure transition construction is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of high-voltage electrical equipment, in particular to a 35kV insulated cable line transition power supply device. Background Art

[0002] With the comprehensive construction of the UHV grid and the development of supporting power grids, the overall architecture of the power system is gradually being upgraded. Currently, power grid construction faces numerous challenges, including the difficulty of power construction, safety risks, and the continued reliability of distribution network power supply. These issues directly impact public quality of life and the stable operation of the power system.

[0003] In order to avoid power interruptions caused by construction or maintenance and ensure the stability and continuity of power supply, when carrying out equipment maintenance or line modification in the power system, special technologies and equipment are used to ensure that the power lines continue to supply power during construction. This process is called non-stop crossing.

[0004] Originally, non-stop crossovers were primarily used on 10kV lines, but as voltage levels rise, the proportion of non-stop crossovers on 35kV lines continues to increase. Furthermore, the increased insulation distance in 35kV distribution lines (from 0.7m for 10kV to 1m for 35kV) presents new challenges in the design and construction of transition cables.

[0005] The existing 10kV transition cable utilizes epoxy resin solid insulation. Testing indicates that the insulation properties of the solid material itself meet the requirements of the 10kV voltage level. However, at 35kV, the existing resin insulation joint method fails to meet insulation testing requirements, including both withstand voltage and partial discharge performance. Simply increasing the insulation thickness cannot meet the safety and reliability requirements for crossing 35kV distribution lines, nor can it meet the safety and reliability requirements for field power outage transition construction in 35kV distribution networks. Utility Model Content

[0006] The utility model aims to provide a 35kV insulated cable line transition power supply device which can meet the safety and reliability requirements of 35kV distribution network field power outage transition construction.

[0007] The utility model provides a 35kV insulated cable line transition power supply device, comprising a shell, an insulating gas box, a single-sided bushing, a conductive rod and a cable plugger; an insulating gas box is provided in the inner cavity of the shell, and the gas box is filled with SF6 gas as an insulating medium; a pressure gauge is provided at one corner of the insulating gas box; two single-sided bushings are provided on the insulating gas box; two cable pluggers are provided on the shell; two conductive rods respectively connect a group of corresponding single-sided bushings and cable pluggers, and at the same time, the conductive rods extend into the insulating gas box and are connected through conductive connectors.

[0008] In one embodiment of the above-mentioned device, the shell is divided into an upper shell and a lower shell that are assembled together; installation grooves for the cable plug are respectively provided on both sides of the lower edge of the upper shell and the upper edge of the lower shell, that is, the assembled surfaces of the upper shell and the lower shell are located on the axial center plane of the cable plug.

[0009] In one embodiment of the above device, the insulating gas box is a rectangular hollow box, and the box body is made of stainless steel.

[0010] In one embodiment of the above device, the upper surface of the insulating gas box is provided with a pressure plate that can be connected and positioned with two single-sided bushings; the single-sided bushings are horizontally placed T-shaped pieces, and the two single-sided bushings are symmetrically fixed on the pressure plate of the insulating gas box.

[0011] In one embodiment of the above device, a conductive rod is provided in the single-sided casing, the conductive rod passes through the insulating gas box and extends into the insulating gas box; the bottom ends of the two conductive rods are connected by a special-shaped copper rod.

[0012] In one embodiment of the above device, the outer ends of both sides of the insulating gas box are connected to grounding copper bars, and the end of the grounding copper bar on one side is connected to the shell and is provided with an external connection stud; the grounding copper bars are all tinned.

[0013] In one embodiment of the above device, a line display is provided on the conductive rod.

[0014] In one embodiment of the above device, baffles extending out of the side walls are provided on the mating surfaces of the two side walls of the upper shell and the lower shell.

[0015] The beneficial effects of the utility model are as follows:

[0016] 1. Provided an assembled transition cable device for 35kV high-voltage distribution lines, using SF6 gas tanks for insulation, ensuring the safety and reliability of the 35kV assembled transition product, while reducing line losses and improving power transmission efficiency;

[0017] 2. The use of gas insulation greatly reduces the weight of the device, making it easier to use during field power outage transition construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the axonometric structure of an embodiment of the present invention.

[0019] Figure 2 for Figure 1 Schematic diagram of the front view structure.

[0020] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure of the middle insulating gas box and single-sided bushing.

[0021] Figure 4 for Figure 3 Schematic diagram of the front view structure. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the relevant technical solutions. Obviously, the embodiments described are only some embodiments, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] Combine Figure 1 and Figure 2 It can be seen that the 35kV insulated cable line transition power supply device disclosed in this embodiment includes a shell 1, an insulating gas box 2, a single-side bushing 3, a conductive rod 4 and a cable plug 5.

[0024] An insulating gas box 2 is provided at the bottom center of the inner cavity of the shell 1, and two single-sided sleeves 3 are symmetrically provided on the top surface of the insulating gas box. The interiors of the two single-sided sleeves are connected to the conductive rod 4; two cable pluggers 5 are respectively provided on the two side walls of the shell, and each conductive rod is connected to the external cable through the cable plugger.

[0025] The housing 1 is divided into an upper housing 11 and a lower housing 12. The lower edge of the upper housing 11 and the upper edge of the lower housing 12 are respectively provided with mounting grooves for the cable plug 5. That is, the joint surface of the upper housing 11 and the lower housing 12 is located at the axial center plane of the cable plug 5.

[0026] The butting surfaces of the two side walls of the upper shell 11 and the lower shell 12 are provided with baffles 13 extending out of the side walls for limiting the end faces of external cables.

[0027] like Figure 3 and Figure 4 As shown, the insulating gas box 2 is a rectangular hollow box, and the box body is made of 3mm304 stainless steel material through a stainless steel stamping air chamber forming process; the box is filled with SF6 gas as an insulating medium.

[0028] The insulation method of this embodiment is SF6 insulation. The dielectric strength of SF6 gas is three times that of air, ensuring the safety and reliability of the gas box under high-voltage conditions. The electric field distribution of this embodiment has passed various test data, including partial discharge test, voltage resistance test, and dynamic thermal stability test. It has the characteristics of full insulation, full sealing, full protection, corrosion resistance, anti-fouling, anti-condensation, and anti-frost. The shell protection level can reach IP65.

[0029] At the same time, under the condition of meeting the gas pressure sealing, the weight of the box is reduced to less than 60kg, thus meeting the requirements of field manual construction.

[0030] The upper surface of the insulating gas box 2 is provided with a pressing plate 21 which can be connected and positioned with the two single-sided bushings.

[0031] The single-sided bushing 3 is a horizontally placed T-shaped piece, and the two single-sided bushings are symmetrically fixed on the pressure plate 21 of the insulating gas box 2. A conductive rod 4 is set in the single-sided bushing, which passes through the insulating gas box and extends into the insulating gas box; the special-shaped copper rod 22 connects the bottom ends of the two conductive rods.

[0032] An externally purchased barometer 23 is provided at the corner of the upper surface of the insulating gas box 2. The pressure in the insulating gas box can be observed by the barometer, and the insulation condition can be judged based on this.

[0033] The outer ends of both sides of the insulating gas box 2 are connected to the grounding copper busbar 24. The end of one of the grounding copper busbars is connected to the shell 1 and is provided with an external stud to facilitate grounding operation. The grounding copper busbars are all tinned.

[0034] One end of each conductive rod 4 passes through the insulating gas box 2 from the side arm of the corresponding single-sided bushing 3, and the other end extends out of the shell 1 from the end of the single-sided bushing. One of the conductive rods is equipped with a purchased line indicator 41, which can be used to determine the charging status of the conductive rod.

[0035] The other ends of the two conductive rods 4 are plugged into the cable plug 5 on the side wall of the housing 1, and are connected to external cables through the cable plug. A rubber sealing component is provided at the connection to enhance waterproof performance.

[0036] The upper shell 11 is provided with observation windows for the charge display 41 and the voltmeter 23 , and explosion-proof glass and a sealing ring are arranged in the observation window.

[0037] The components of this embodiment are connected by a thermal welding process to prevent gas leakage.

[0038] The method when using this power supply device is as follows:

[0039] 1. Confirm that all components are intact, clean the work area, and ensure there are no external interference factors.

[0040] 2. Place the insulating gas box accurately at the center of the lower shell, align the upper and lower shells, and fix them together; ensure that the two single-sided casings are accurately fixed on the top of the insulating gas box, and correctly connect the conductive rods to the inside of the single-sided casing, and connect the two conductive rods through the special-shaped copper rod; connect the external cable to the conductive rod through the cable plug to ensure a good seal.

[0041] 3. Ensure that the grounding copper busbar is correctly connected to the housing and external grounding studs to achieve good grounding protection.

[0042] 4. After the installation is completed, check the pressure of SF6 gas through the pressure gauge installed on the insulating gas box to ensure that the pressure is within the normal range to ensure the insulation performance of the gas box; check the line display to judge the live status of the conductive rod to ensure that the device is in a good insulation state to prevent safety risks during live operations.

[0043] 5. After ensuring that all connections are correct and well sealed, gradually pressurize and inspect each part of the device to ensure that there is no gas leakage; after confirming that all inspections of the device are normal, gradually power on and start the 35kV insulated cable line transition power supply device; during the power supply process, monitor the readings of the voltmeter and live display in real time to ensure that the equipment operates safely and stably at the rated voltage.

[0044] 6. During the operation of the equipment, regularly check the pressure reading on the pressure gauge to ensure that the SF6 gas is kept within the appropriate pressure range; regularly check the sealing of the cable plug to ensure that there is no air leakage or water leakage; during operation, if any abnormality is found, such as unstable voltage, reduced pressure in the insulating gas box, or abnormal live display, the operation should be stopped immediately and the fault should be checked.

[0045] 7. When it is necessary to dismantle the equipment, first cut off the power supply to ensure that the equipment is in a power-off state; gradually release the SF6 gas in the insulating gas box, and use special tools to dismantle components such as conductive rods and cable plugs; the dismantled equipment should be properly stored in a dry, well-ventilated environment to avoid corrosion or damage.

[0046] The advantages of using this device are:

[0047] 1. Provided an assembled transition cable device for 35kV high-voltage distribution lines, using SF6 gas tanks for insulation, ensuring the safety and reliability of the 35kV assembled transition product, while reducing line losses and improving power transmission efficiency;

[0048] 2. The use of gas insulation greatly reduces the weight of the device, making it easier to use during field power outage transition construction;

[0049] 3. The cable and docking box are plug-and-play, requiring no complicated installation steps or tools, making it quick and easy to use.

[0050] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although detailed descriptions have been made with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalent features for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A 35kV insulated cable line transition power supply device, characterized by: It includes a shell, an insulating gas box, a single-side bushing, a conductive rod and a cable plug; An insulating gas box is provided in the inner cavity of the shell, and the gas box is filled with SF6 gas as an insulating medium; a pressure gauge is provided at one corner of the insulating gas box; two single-sided bushings are provided on the insulating gas box; two cable pluggers are provided on the shell; two conductive rods respectively connect a set of corresponding single-sided bushings and cable pluggers, and at the same time, the conductive rods extend into the insulating gas box and are connected through conductive connectors.

2. The 35kV insulated cable line transition power supply device according to claim 1, characterized in that: The shell is divided into an upper shell and a lower shell that are joined together; installation grooves for the cable plug are respectively provided on both sides of the lower edge of the upper shell and the upper edge of the lower shell, that is, the joining surfaces of the upper shell and the lower shell are located at the axial center plane of the cable plug.

3. The 35kV insulated cable line transition power supply device according to claim 1, characterized in that: The insulating gas box is a rectangular hollow box, and the box body is made of stainless steel.

4. The 35kV insulated cable line transition power supply device according to claim 1, characterized in that: The upper surface of the insulating gas box is provided with a pressing plate which can be connected and positioned with two single-sided bushings; the single-sided bushings are horizontally placed T-shaped pieces, and the two single-sided bushings are symmetrically fixed on the pressing plate of the insulating gas box.

5. The 35kV insulated cable line transition power supply device according to claim 4, characterized in that: A conductive rod is arranged in the single-sided casing, and the conductive rod passes through the insulating gas box and extends into the insulating gas box; the bottom ends of the two conductive rods are connected by a special-shaped copper rod.

6. The 35kV insulated cable line transition power supply device according to claim 1, characterized in that: The outer ends of both sides of the insulating gas box are connected to grounding copper bars, wherein the end of the grounding copper bar on one side is connected to the shell and is provided with an external connection stud; the grounding copper bars are all tinned.

7. The 35kV insulated cable line transition power supply device according to claim 1, characterized in that: A line display is provided on the conductive rod.

8. The 35kV insulated cable line transition power supply device according to claim 2, characterized in that: The butting surfaces of the two side walls of the upper shell and the lower shell are provided with baffles extending out of the side walls.

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