Environment-friendly gas insulation ring main unit composite insulation structure

Abstract

The invention discloses an environment-friendly gas insulation ring main unit composite insulation structure which is characterized in that the structure comprises a sleeve installation plate, and a plurality of sleeves are arranged on the sleeve installation plate; the front end of the sleeve is provided with a branch bus through mutually fixed umbrella skirt structures and a copper rod shielding case, the front end of the copper rod shielding case is provided with a branch bus mounting hole, and the branch bus mounting hole is provided with a branch bus through a disc spring; the umbrella skirt structure is a multi-skirt umbrella skirt structure, and the branch bus passes through the mounting hole of the disc spring, the mounting hole of the copper rod shielding cover and the mounting hole of the umbrella skirt structure through the connecting thread body at one end and then is fixed with the sleeve. Under the conditions that the phase distance is 115 mm and the inflation pressure is 0.05 MPa (dry air), the power frequency withstand voltage of 65 kV / 1 min and the lightning impulse insulation level of 125 kV can be achieved, the structure adopts the wire inlet sleeve which is the same as that of a 12 kV environment-friendly ring main unit, key parts are universal, material purchasing and management cost can be reduced, meanwhile, silicone rubber umbrella skirts and epoxy vulcanization can be manufactured in a mold opening mode, and production cost is reduced.

Description

Technical Field

[0001] The invention relates to the field of ring main unit manufacturing, and in particular to a composite insulation structure of an environmentally friendly gas insulated ring main unit. Background Art

[0002] As countries around the world pay more and more attention to environmental protection, SF6 gas insulated ring main unit is gradually replaced by environmental protection ring main unit. 12kV environmental protection ring main unit technology has matured and is widely used, but there are no related products of 24kV environmental protection ring main unit in China. Only a few companies in the world have completed the development and operation of 24kV environmental protection ring main unit products. There are no related products of 36kV environmental protection ring main unit at home and abroad.

[0003] Due to the high voltage level, higher insulation requirements are placed on the ring main unit. Currently, the existing 24kV environmentally friendly ring main unit products in the world mainly improve the insulation level by increasing the insulation distance, increasing the inflation pressure, using mixed gases, etc. Increasing the insulation distance will increase the width of the ring main unit and lack compactness; increasing the inflation pressure will increase costs, and high-pressure gas tanks are dangerous. Some elements in the mixed gas usually produce harmful substances under the action of electric arcs, which do not meet environmental protection requirements. Summary of the invention

[0004] In order to overcome the above-mentioned defects of the prior art, an object of the present invention is to provide an environmentally friendly gas insulated ring main unit composite insulation structure.

[0005] The environmentally friendly gas insulated ring main unit composite insulation structure of the present invention reaches a power frequency withstand voltage of 65kV / 1min and a lightning impulse insulation level of 125kV under the conditions of an inflation pressure of 0.05MPa (dry air) and a phase spacing of 115mm.

[0006] In order to achieve the purpose of the present invention, the technical solution adopted is:

[0007] An environmentally friendly gas-insulated ring main unit composite insulation structure, comprising:

[0008] A sleeve mounting plate, on which a plurality of sleeves are arranged;

[0009] A branch busbar is provided at the front end of the sleeve through an umbrella skirt structure and a copper rod shielding cover fixed to each other, a branch busbar mounting hole is provided at the front end of the copper rod shielding cover, and a branch busbar is installed on the branch busbar mounting hole through a disc spring;

[0010] The umbrella skirt structure is a multi-skirt umbrella skirt structure, and the branch busbar is fixed to the sleeve after passing through the mounting hole of the disc spring, the mounting hole of the copper rod shielding cover and the mounting hole of the umbrella skirt structure through a connecting threaded body at one end.

[0011] In a preferred embodiment of the present invention, the inner structure of a single branch busbar is a conductive copper rod, and a conductive copper rod insulation layer is provided outside the conductive copper rod.

[0012] In a preferred embodiment of the present invention, the insulating layer of the conductive copper rod is made of vulcanized epoxy resin.

[0013] In a preferred embodiment of the present invention, a shielding cover insulating layer is arranged outside the shielding cover body of the copper rod shielding cover, and the shielding cover insulating layer is made of vulcanized epoxy resin.

[0014] In a preferred embodiment of the present invention, the multi-skirt umbrella skirt structure is a silicone rubber umbrella skirt structure with a first skirt and a second skirt provided at the front and back.

[0015] In a preferred embodiment of the present invention, the bushing is a 12kV incoming line insulating bushing.

[0016] In a preferred embodiment of the present invention, first to third bushings are arranged on the bushing mounting plate, and an A-phase branch busbar, a B-phase branch busbar and a C-phase branch busbar are respectively arranged on the first to third bushings.

[0017] The beneficial effects of the present invention are:

[0018] The present invention provides an environmentally friendly gas-insulated ring main unit composite insulation structure, which achieves a power frequency withstand voltage of 65kV / 1min and a lightning impulse insulation level of 125kV under the conditions of an inflation pressure of 0.05MPa (dry air) and a phase-to-phase spacing of 115mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The structure of the present invention is schematically shown Figure 1 .

[0020] Figure 2 The structure of the present invention is schematically shown Figure 2 .

[0021] Figure 3 The structure of the present invention is schematically shown Figure 3 .

[0022] Figure 4 The structure of the present invention is schematically shown Figure 4 .

[0023] Figure 5 The structure of the present invention is schematically shown Figure 5 . DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below through the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the scope of the present invention. In addition, in the following structure, the description of the known structure and technology is omitted to avoid unnecessary confusion of the concept of the present invention.

[0025] like Figure 1-5 An environmentally friendly gas-insulated ring main unit composite insulation structure is shown, comprising a bushing mounting plate 7, on which a plurality of bushings 4 are arranged, and the bushings 4 are 12kV incoming line insulating bushings.

[0026] A branch busbar is arranged at the front end of the bushing 4 through an umbrella skirt structure 5 and a copper rod shielding cover 6 which are fixed to each other.

[0027] Specifically, a branch busbar mounting hole 61 is provided at the front end of the copper rod shielding cover 6 , and a branch busbar is mounted on the branch busbar mounting hole 61 via a disc spring 8 .

[0028] The first to third bushings are arranged on the bushing installation plate 7, and the A-phase branch busbar 1, the B-phase branch busbar 2 and the C-phase branch busbar 3 are respectively arranged on the first to third bushings.

[0029] Focus on combination Figure 5 Taking the A-phase implementation method as an example, the internal structure of a single branch busbar is a conductive copper rod 1b, and a conductive copper rod insulation layer 1c is arranged outside the conductive copper rod 1b. The conductive copper rod insulation layer 1c is made of vulcanized epoxy resin.

[0030] Focus on combination Figure 3 The umbrella skirt structure 5 is a multi-skirt umbrella skirt structure, which is a silicone rubber umbrella skirt structure with a first skirt edge 5c and a second skirt edge 5b arranged at the front and back.

[0031] Focus on combination Figure 4 , copper rod shielding, a shielding cover insulating layer is arranged outside the shielding cover body 6, and the shielding cover insulating layer is made of vulcanized epoxy resin.

[0032] Specifically, taking the implementation method of phase A as an example, the implementation methods of phase B and phase C are the same as that of phase A.

[0033] The incoming line insulating bushing 4 is mounted on the bushing mounting plate 7 by means of fasteners. One end of the bushing is C-shaped and connected to the cable outside the gas box, and the other end is cylindrical and sealed in the gas box.

[0034] An umbrella skirt 5 is installed on the incoming line insulating bushing 4. Two skirt edges 5b and 5c are arranged on the umbrella skirt 5. The umbrella skirt 5 is made of silicone rubber, which effectively increases the creepage distance from the connection between the A-phase branch busbar 1 and the incoming line insulating bushing 4 to the bushing mounting plate 7. The mounting hole 5a on the umbrella skirt 5 is sleeved on the cylindrical surface of the incoming line insulating bushing 4, has a certain amount of compression, and the contact is tight and reliable.

[0035] The overall structure of the A-phase branch busbar 1 includes a connecting thread 1a, a copper rod 1b, and a copper rod sulfide layer 1c. The connecting thread 1a passes through the disc spring 8, the copper rod shielding cover 6 and the threaded hole of the incoming line insulating sleeve 4 in sequence. This connection method avoids the use of additional fasteners to affect the insulation. A disc spring 8 is set at the connection point to adjust the tightness of the connection to make the connection more reliable.

[0036] The copper rod 1b, as the conductive part, is covered by the copper rod sulfide layer 1c. The epoxy layer is 2 mm thick, which effectively increases the insulation.

[0037] A shielding cover 6 is provided at the connection, and the shielding cover 6 comprises a shielding cover body 6a and a shielding cover vulcanization layer 6b. The shielding cover vulcanization layer 6b is coated on the inner and outer surfaces of the shielding cover body 6a, and has a thickness of 2mm, which can effectively shield the electric field at the connection and improve the insulation level.

[0038] Normally, in a 12kV environmentally friendly ring main unit, if the insulation distance is sufficient, the 12kV insulation requirement can be met without the need for additional insulation structure.

[0039] The present invention adds a series of insulation measures under the condition that the insulation distance is the same as that of the 12kV environmental protection ring network cabinet. The incoming line insulation bushing adopts a 12kV bushing, which is installed on the mounting plate with a phase spacing of 115mm. The insulating gas is dry air and the inflation pressure is 0.05MPa. An umbrella skirt is installed on the bushing, which is made of silicone rubber to increase the creepage distance from the connection between the branch busbar and the bushing to the mounting plate. The surface of the branch busbar is vulcanized and coated with a 2mm thick epoxy layer to effectively increase the insulation. A thread is set at one end of the busbar, which is directly connected to the bushing thread to avoid the use of additional fasteners to affect the insulation. A disc spring is set at the connection to make the bushing and the busbar more tightly connected. At the same time, a shielding cover is set at the connection, and the inner and outer surfaces of the shielding cover are vulcanized and coated with a 2mm thick epoxy layer to shield the electric field at the connection to avoid discharge.

[0040] The present invention can achieve a power frequency withstand voltage of 65kV / 1min and a lightning impulse insulation level of 125kV under the conditions of a phase spacing of 115mm and an inflation pressure of 0.05MPa (dry air). The structure adopts the same incoming line bushing as the 12kV environmentally friendly ring network cabinet, achieving common key components and helping to reduce material procurement and management costs. At the same time, silicone rubber sheds and epoxy vulcanization can be molded and manufactured to reduce production costs.

[0041] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or component referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0042] The basic principles and main features of the invention and the advantages of the invention are shown and described above.

[0043] Those skilled in the art should understand that the present invention is not limited to the above-mentioned embodiments. The above-mentioned embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which shall fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An environmentally friendly gas insulated ring main unit composite insulation structure, characterized in that: include: A sleeve mounting plate, on which a plurality of sleeves are arranged; A branch busbar is provided at the front end of the bushing through an umbrella skirt structure and a copper rod shielding cover fixed to each other, a branch busbar mounting hole is provided at the front end of the copper rod shielding cover, and a branch busbar is installed on the branch busbar mounting hole through a disc spring; The umbrella skirt structure is a multi-skirt umbrella skirt structure, and the branch busbar is fixed to the sleeve after passing through the mounting hole of the disc spring, the mounting hole of the copper rod shielding cover and the mounting hole of the umbrella skirt structure through a connecting threaded body at one end.

2. The environmentally friendly gas insulated ring main unit composite insulation structure according to claim 1, characterized in that: The inner structure of a single branch busbar is a conductive copper rod, and a conductive copper rod insulation layer is arranged outside the conductive copper rod.

3. The environmentally friendly gas insulated ring main unit composite insulation structure according to claim 1, characterized in that: The insulating layer of the conductive copper rod is made of vulcanized epoxy resin.

4. The environmentally friendly gas insulated ring main unit composite insulation structure according to claim 1, characterized in that: A shielding cover insulating layer is arranged outside the shielding cover body of the copper rod shielding cover, and the shielding cover insulating layer is made of vulcanized epoxy resin.

5. The composite insulation structure of an environmentally friendly gas-insulated ring main unit according to claim 1, characterized in that: The multi-skirt umbrella skirt structure is a silicone rubber umbrella skirt structure with a first skirt and a second skirt arranged at the front and back.

6. The environmentally friendly gas insulated ring main unit composite insulation structure according to claim 1, characterized in that: The bushing is a 12kV incoming line insulating bushing.

7. The environmentally friendly gas insulated ring main unit composite insulation structure according to claim 1, characterized in that: The first to third bushings are arranged on the bushing installation plate, and the A-phase branch busbar, the B-phase branch busbar and the C-phase branch busbar are respectively arranged on the first to third bushings.

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