CN105529663A - Busbar assembly and gas-insulated metal-enclosed switchgear using the busbar assembly - Google Patents

Abstract

The invention relates to a bus assembly and a gas insulated metal-enclosed switchgear using the bus assembly. The invention aims at solving the problem in the prior art that the temperature rise at the position of the electric connection contact finger of the bus assembly is liable to exceed the demand of the national standard so that the performance demand of a power device cannot be satisfied. In order to solve the technical problem, a heat radiation structure is arranged on the bus assembly at the position corresponding to the contact finger; and the heat radiation speed at the connection part of the electric connection and the conductive rod contact finger is increased.

Description

Busbar assembly and gas-insulated metal-enclosed switchgear using the busbar assembly

technical field

The invention relates to a busbar assembly and a gas-insulated metal-enclosed switchgear using the busbar assembly.

Background technique

UHV power transmission can solve technical problems such as system instability and short-circuit current increase caused by large-capacity long-distance power transmission and the increase of power flow in the main outer ring system. The number of UHV transmission lines is small, which can effectively reduce the equivalent inductance of the system and improve system stability. Therefore, major high-voltage switchgear manufacturers are developing UHV switchgear. At present, the current capacity of the main busbar for 252KV gas-insulated metal-enclosed switchgear of domestic manufacturers is up to 4000A, and cannot be further increased. The rise is too large and exceeds the glass transition temperature of the insulator, which will eventually lead to insulation failure and affect the use of the busbar. As disclosed in Chinese patent 200920088218.1, the bus bar for the UHV test device includes a basin-type insulator and a housing sandwiched between the two basin-type insulators, and the central conductor of the basin-type insulator inside the housing is fixedly provided with an electrical connection. Conductive rods are inserted between two adjacent electrical connections. When the current passing through the busbar increases to 5000A, the central conductor of the pot insulator and the electrical connection fingers of the electrical connection and the conductive rod will generate a large amount of heat so that the temperature rise exceeds the requirements of GB11022, and cannot meet the requirements of electrical equipment. performance requirements.

Contents of the invention

The purpose of the present invention is to provide a busbar assembly with a flow capacity of 5000A to solve the problem in the prior art that the temperature rise at the electrical connection contacts of the busbar assembly easily exceeds the requirements of the national standard and cannot meet the performance requirements of power equipment; the present invention The object of the invention is also to provide a gas-insulated metal-enclosed switchgear using the above-mentioned busbar assembly.

In order to solve this technical problem, the busbar assembly of the present invention adopts the following technical solutions:

The bus bar assembly includes a plug-fit electrical connection and a conductive rod. The electrical connection and the plug-fit section of the conductive rod are electrically connected through contact fingers. A heat dissipation channel is opened on the electrical connection and/or the conductive rod at the position corresponding to the contact finger.

The plug-fit section for electrical connection is inserted into the conductive rod, and the heat dissipation channel includes a first heat dissipation hole radially penetrating through the conductive rod.

The plug-fit section for electrical connection is a hollow structure, and the heat dissipation channel further includes a second heat-dissipation hole corresponding to the first heat-dissipation hole radially penetrating through the plug-fit section for electrical connection.

The outer surface of the plug-in mating section of the electrical connection is provided with a groove for the contact finger to partially sink into the ground, and the bottom of the groove communicates with the opening of the second heat dissipation hole and its width is greater than the diameter of the second heat dissipation hole .

The electrical connection also includes a flange protruding from the outer surface of the mating section on the rear side, and an insulating gasket is set on the outer surface of the mating section, and the insulating gasket is located on the front surface of the flange and the conductive between the corresponding end faces of the rod.

The gas-insulated metal-enclosed switchgear of the present invention adopts the following technical solutions:

Gas-insulated metal-enclosed switchgear includes a busbar assembly, and the busbar assembly includes a plug-fit electrical connection and a conductive rod. The electrical connection and the plug-fit section of the conductive rod are electrically connected through contact fingers. A heat dissipation channel is opened at a position corresponding to the contact finger.

The plug-fit section for electrical connection is inserted into the conductive rod, and the heat dissipation channel includes a first heat dissipation hole radially penetrating through the conductive rod.

The plug-fit section for electrical connection is a hollow structure, and the heat dissipation channel further includes a second heat-dissipation hole corresponding to the first heat-dissipation hole radially penetrating through the plug-fit section for electrical connection.

The outer surface of the plug-in mating section of the electrical connection is provided with a groove for the contact finger to partially sink into the ground, and the bottom of the groove communicates with the opening of the second heat dissipation hole and its width is greater than the diameter of the second heat dissipation hole .

The electrical connection also includes a flange protruding from the outer surface of the mating section on the rear side, and an insulating gasket is set on the outer surface of the mating section, and the insulating gasket is located on the front surface of the flange and the conductive between the corresponding end faces of the rod.

Analysis of the beneficial effects of the present invention: the busbar assembly of the present invention is provided with a heat dissipation channel at the position corresponding to the contact finger, which is beneficial to increase the heat dissipation speed at the connection between the electrical connection and the contact finger of the conductive rod.

Furthermore, the plug-in mating section of the electrical connection of the present invention is inserted into the conductive rod, so the diameter of the conductive rod can be more than the diameter of the electrical connection, which is conducive to increasing the conductive rod without changing the design size of the busbar. The flow area of the rod is conducive to accelerating the heat dissipation rate of the conductive rod and reducing the temperature rise of the conductive rod.

Description of drawings

Fig. 1 is a schematic structural view of an embodiment of the gas-insulated metal-enclosed switchgear of the present invention;

Fig. 2 is a schematic structural view of an embodiment of the busbar assembly of the present invention;

Fig. 3 is the structural enlarged view of the electrical connection and the connection of the conductive rod in Fig. 2;

Fig. 4 is a schematic structural view of the spring contact finger in Fig. 2;

Fig. 5 is a schematic structural diagram of the pot insulator in Fig. 2 .

detailed description

Examples of gas-insulated metal-enclosed switchgear:

The structure of the gas-insulated metal-enclosed switchgear is shown in Figure 1, including multiple bays I, and the multiple bays I are electrically connected through the busbar assembly II to realize the current confluence and distribution between the bays. The busbar assembly II includes A, B, The specific structure of C three-phase busbar and single-phase busbar assembly is shown in Fig. Located in the housing 2 and including an insulating body 11 made of epoxy resin and a central conductor 12 made of aluminum, the electrical connection 3 is fixed on the central conductor 12 by bolts to realize the conductive connection between the central conductor 12 and the electrical connection 3 .

The electrical connection 3 includes a plug-in section 31 at the front end and a flange 32 protruding from the outer surface of the plug-in section on the rear side. The outer diameter of the flange 32 is greater than the outer diameter of the plug-in section 31 . There is a blind hole 35 extending along the axial direction of the electrical connection 3 . The depth of the blind hole 35 is greater than the length of the plug-in section 31 so that part of it extends into the corresponding shaft section of the flange 32 . A second cooling hole 33 extending along the radial direction of the electrical connection 3 is opened on the plugging section 31 , and the second cooling hole 33 penetrates through the wall thickness of the plugging section 31 . The outer peripheral surface of the plug-in section 31 of the electrical connection 3 is also processed with an annular groove 34 for the spring contact finger 6 to be partially sunk and installed. The annular groove 34 communicates with the second heat dissipation hole 33 and its groove width is larger than that of the second heat dissipation hole 33 diameter. The outer peripheral surface of the electrical connection 3 is covered with an insulating gasket 5, the rear end surface of the insulating gasket 5 is mounted on the front end surface of the flange 32, and the front end surface of the insulating gasket 5 is connected to the rear end surface of the tubular conductive rod 4. There is a certain gap between them, and the position of one of the second cooling holes 33 is adapted to the position of this gap.

The spring contact finger 6 is a coil formed by welding the first and last ends of the cylindrical helical spring together. In order to increase the electrical conductivity of the spring contact finger 6, the outer surface of the spring contact finger 6 is plated with silver, and the outer surface of the spring contact finger 6 is fabricated. The structure is shown in Figure 4, the width of the ring-shaped spring contact finger 6 is larger than the diameter of the second cooling hole 33 and smaller than the groove width of the ring groove 34, so the spring contact finger 6 can be sunk into the ring groove 34 without slide down. The outer diameter of the spring contact finger 6 is larger than the outer diameter of the electrical connection 3 and smaller than the inner diameter of the conductive rod 4 , so when it is sunk into the ring groove 34 , the spring contact finger 6 will partially expose the electrical connection 3 . When the conductive rod 4 whose outer diameter is larger than that of the electrical connection 3 is set on the outer peripheral surface of the plug-in section 31 , the spring contact finger 6 is compressed and pressed against the conductive rod 4 and the electrical connection 3 to realize the electrical connection between the two. In order to ensure the heat dissipation at the contact between the spring contact finger 6 and the conductive rod, a first heat dissipation hole 41 is provided on the conductive rod 4, and the first heat dissipation hole 41 communicates with the second heat dissipation hole 33, so the spring contact finger in the inner cavity The heat generated by 6 can be quickly dissipated into the air through the second heat dissipation hole 33 and the first heat dissipation hole 41, which is beneficial to reduce the temperature rise at the contact point.

In order to increase the flow capacity of the enclosed bus bar, the diameter of the center conductor 12 of the pot insulator 1 is also increased in this embodiment, and the temperature rise is suppressed by increasing the effective flow area of the center conductor 12, so that the center conductor The highest temperature is lower than the glass transition temperature of the insulating body 11, ensuring that the insulating body 11 will not transform from a glass state to a viscous fluid state.

In other embodiments, the conductive rod can also be plugged into the electrical connection, and the heat dissipation structure can also be arranged only on the external parts accordingly; the spring contact finger can also be a strap contact finger; the spring contact The finger can also be fixed on the outer surface of the electrical connection by welding. At this time, there is no need to provide a ring groove for the spring contact finger to sink into the electrical connection; to ensure a stable conductive connection between the electrical connection and the conductive rod In some cases, the width of the ring groove can also be less than the diameter of the second heat dissipation hole and equal to the diameter of the second heat dissipation hole; under the condition that the end face of the conductive rod 4 can not be directly contacted with the electrically connected flange, no insulation can be provided. gasket.

Examples of busbar assemblies:

The structure of the busbar assembly is shown in Figures 2 to 5, and its specific structure is the same as that of the busbar assembly in the gas-insulated metal-enclosed switchgear, so it will not be described in detail here.

Claims (10)

1. The busbar assembly, including the plug-fit electrical connection and the conductive rod, the electrical connection and the plug-fit section of the conductive rod are electrically connected through the contact fingers, and the feature is that: the electrical connection and/or the conductive rod are on the corresponding contact finger position There are heat dissipation channels. 2 . The bus bar assembly according to claim 1 , wherein the plug-in mating section for electrical connection is inserted into the conductive rod, and the heat dissipation channel includes a first heat dissipation hole radially penetrating through the conductive rod. 3 . 3. The bus bar assembly according to claim 2, characterized in that: the plug-in fitting section for electrical connection is a hollow structure, and the heat dissipation channel further includes a plug-in mating section that is arranged corresponding to the first heat dissipation hole and penetrates through the electrical connection in the radial direction the second cooling hole. 4. The busbar assembly according to claim 3, characterized in that: the outer surface of the plug-in mating section for electrical connection is provided with a groove for the contact finger to partially sink into the ground, and the bottom of the groove is in contact with the second heat sink. The openings of the holes are connected and the width thereof is larger than the diameter of the second cooling hole. 5. The busbar assembly according to any one of claims 2 to 4, wherein the electrical connection also includes a flange protruding from the outer surface of the mating section on the rear side, and the outer surface of the mating section An insulating gasket is also sheathed on the top, and the insulating gasket is located between the front end surface of the flange and the corresponding end surface of the conductive rod. 6. Gas-insulated metal-enclosed switchgear, including a busbar assembly, the busbar assembly includes a plug-fit electrical connection and a conductive rod, and the electrical connection and the plug-fit section of the conductive rod are electrically connected through contact fingers. It is characterized in that: the electrical connection and /or a heat dissipation channel is opened on the conductive rod at the position corresponding to the contact finger. 7. The gas-insulated metal-enclosed switchgear according to claim 6, wherein the plug-in fitting section for electrical connection is inserted into the conductive rod, and the heat dissipation channel includes a first heat dissipation hole radially penetrating through the conductive rod. 8. The gas-insulated metal-enclosed switchgear according to claim 7, characterized in that: the plug-in fitting section for electrical connection is a hollow structure, and the heat dissipation channel also includes a radially through electrical connection corresponding to the first heat dissipation hole. Insert the second heat dissipation hole of the mating section. 9. The gas-insulated metal-enclosed switchgear according to claim 8, characterized in that: the outer surface of the plug-in fitting section for electrical connection is provided with a groove for the contact finger part to sink into the ground, and the groove bottom of the groove It communicates with the opening of the second heat dissipation hole and has a width greater than the diameter of the second heat dissipation hole. 10. The gas-insulated metal-enclosed switchgear according to any one of claims 7 to 9, wherein the electrical connection further includes a flange protruding from the outer surface of the plug-fit section on the rear side, and the plug-fit An insulating gasket is sheathed on the outer surface of the segment, and the insulating gasket is located between the front end surface of the flange and the corresponding end surface of the conductive rod.