CN204332808U - Medium-voltage switchgear solid-sealed pole - Google Patents

Abstract

The utility model provides a kind of Medium Voltage Switchgear pole, described pole comprises integrally pours into a mould by epoxy resin the can formed, be arranged side by side breaker vacuum arc control device and isolating switch vacuum interrupter in described can, and be provided with heat radiation gap structure between described breaker vacuum arc control device and described isolating switch vacuum interrupter.Medium Voltage Switchgear pole of the present utility model has that volume is little, insulating reliability good and the uniform beneficial effect of Electric Field Distribution.

Description

Medium-voltage switchgear solid-sealed pole

technical field

The utility model relates to the technical field of medium-voltage power distribution equipment, in particular to a solid-sealed pole of a medium-voltage switchgear. The solid-sealed pole of the medium-voltage switchgear has double arc extinguishing chambers and is mainly used in a medium-voltage primary power distribution switchgear. .

Background technique

Medium-voltage switchgear mainly refers to high-voltage complete switchgear with a voltage level of 3.6-40.5KV. The primary circuit of the medium-voltage switchgear for primary power distribution is usually composed of a circuit breaker and a disconnector. In order to realize the insulation protection of circuit breakers and isolating switches, SF ₆ and compound gas are often used for insulation in traditional methods.

As an emerging technology, medium-voltage solid insulation has been gradually applied to the R&D and production of medium-voltage switchgear. The solid insulation protection of the circuit breaker is usually realized through the vacuum interrupter used in the epoxy resin casting circuit breaker; while the insulation protection of the disconnector often adopts the air-solid composite insulation method: in the epoxy resin insulation sleeve, One end of the isolation switch is fixed, and the other end is driven by an operating mechanism to rotate to three different positions to realize opening, closing, and grounding operations. This kind of isolating switch adopts air insulation, which is easy to be caused by the actual working conditions and insufficient creepage distance (creepage distance refers to the radius of the charged area between two conductive parts measured along the surface of the insulating structure (the insulating material around the conductor is It was burned due to electric polarization and charging)), arcing and other reasons. The solid insulation structure of the medium-voltage switchgear adopting the above-mentioned technical solution has a large volume, occupies a large area, and is easily affected by harsh weather such as condensation.

In addition, the solid insulation structure of the medium voltage switchgear also needs to have a uniform electric field distribution, because if there is a high local electric field in the insulation structure, these parts are prone to insulation breakdown and partial discharge during use, which will lead to the The insulating performance of the insulating structure is greatly reduced. Moreover, the solid insulation structure of the medium-voltage switchgear also needs good heat dissipation performance to prevent insulation failure due to cracking.

Utility model content

Based on the above technical problems, the utility model provides a solid-sealed pole of a medium-voltage switchgear to improve its heat dissipation performance and insulation reliability while reducing the volume of the solid-sealed pole.

The embodiment of the utility model provides a solid-sealed pole of a medium-voltage switchgear. The solid-sealed pole includes a sealed shell formed by integral casting of epoxy resin, and a vacuum interrupter for a circuit breaker and a vacuum interrupter are arranged side by side in the sealed shell. A vacuum interrupter for an isolating switch, and a heat dissipation gap structure is provided between the vacuum interrupter for the circuit breaker and the vacuum interrupter for the isolating switch.

In one embodiment, the solid-sealed pole includes a first incoming and outgoing wire seat located on one side of the vacuum interrupter of the circuit breaker and a second incoming and outgoing wire seat located on one side of the vacuum interrupter of the isolating switch; The moving end of the vacuum interrupter of the circuit breaker is electrically connected to the first incoming and outgoing wire seat, the moving end of the vacuum interrupter of the isolating switch is electrically connected to the second incoming and outgoing wire seat, and the vacuum interrupter of the circuit breaker The static end is electrically connected to the static end of the vacuum interrupter of the isolating switch.

In one embodiment, the first wire inlet and outlet seats and the second wire inlet and outlet seats are arranged symmetrically.

In one embodiment, the static end of the vacuum interrupter of the circuit breaker is electrically connected to the static end of the vacuum interrupter of the isolation switch through a flexible connection structure.

In one embodiment, one side of the vacuum interrupter of the isolating switch is further provided with an experimental terminal electrically connected to the moving end of the vacuum interrupter of the isolating switch, and the experimental terminal extends out of the sealed casing.

In one embodiment, the solid-sealed pole further includes a first insulating pull rod and a second insulating pull rod, the first insulating pull rod and the second insulating pull rod are arranged side by side and extend out of the sealed casing, and the circuit breaker The moving end of the vacuum interrupter is linked with the first insulating pull rod, and the moving end of the vacuum interrupter of the isolation switch is linked with the second insulating pull rod.

In one embodiment, the inner surface of the sealing shell surrounding the first insulating rod and the second insulating rod is in the shape of an umbrella skirt.

In one embodiment, a three-position isolating switch is installed in the vacuum interrupter chamber of the isolating switch.

In one embodiment, the embedded pole is a 1250A embedded pole.

In one embodiment, the embedded pole is a 1250A embedded pole, and further includes a first insulating pull rod, a second insulating pull rod and an experimental terminal; wherein, the first insulating pull rod and the second insulating pull rod are arranged side by side And protrude from the sealed shell, the inner surface of the sealed shell surrounding the first insulating rod and the second insulating rod is in the shape of an umbrella skirt, and the moving end of the vacuum interrupter of the circuit breaker is connected to the first insulating rod. An insulating pull rod is linked, and the moving end of the vacuum interrupter of the isolating switch is linked with the second insulating pull rod; the experiment terminal is set on one side of the vacuum interrupter of the isolating switch and extends out of the sealed casing , and is electrically connected to the moving end of the isolating switch vacuum interrupter; the first incoming and outgoing wire holders and the second incoming and outgoing wire holders are arranged symmetrically; and three stations are installed in the isolating switch vacuum interrupter isolating switch.

The solid-sealed pole of the medium-voltage switchgear of the utility model seals the vacuum interrupter of the circuit breaker and the vacuum interrupter of the isolating switch placed side by side through the sealed shell integrally cast by solid insulating materials, and the vacuum interrupter of the circuit breaker and the vacuum interrupter of the isolation switch are sealed. There is a heat dissipation gap structure between the vacuum interrupters of the isolating switch. In this way, the utility model can reduce the volume of the solid-sealed pole and make it have better heat dissipation performance, insulation reliability and more uniform electric field distribution. .

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings based on these drawings without creative work. In the attached picture:

Fig. 1 is a schematic cross-sectional view of a solid-sealed pole of a medium-voltage switchgear according to an embodiment of the present invention;

Fig. 2 is a schematic cross-sectional view of a solid-sealed pole of a medium-voltage switchgear containing insulating pull rods according to an embodiment of the utility model.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiment of the utility model clearer, the embodiment of the utility model will be further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiment of the utility model and its description are used to explain the utility model, but not as a limitation to the utility model.

Fig. 1 is a schematic cross-sectional view of a solid-sealed pole of a medium-voltage switchgear according to an embodiment of the present invention. As shown in Figure 1, the solid-sealed pole 1 of the medium-voltage switchgear includes a circuit breaker vacuum interrupter 14 and a disconnector vacuum interrupter 16 arranged side by side, and a circuit breaker vacuum interrupter 14 and a disconnector vacuum interrupter 16 The sealed casing 11 formed by integral casting of solid insulating material (such as epoxy resin) is sealed, and a heat dissipation gap structure 20 is provided between the vacuum interrupter chamber 14 of the circuit breaker and the vacuum interrupter chamber 16 of the isolating switch.

The heat dissipation gap structure 20 may be various gaps provided between the vacuum interrupter 14 of the circuit breaker and the vacuum interrupter 16 of the disconnector, such as gaps such as porous and hollow. Preferably, it is an air chamber formed by the air gap between the circuit breaker vacuum interrupter 14 and the disconnector vacuum interrupter 16, and preferably the gap is filled with the circuit breaker vacuum interrupter 14 and the disconnector vacuum interrupter. The entire space between the arc chambers 16.

Further, in one embodiment, as shown in FIG. 1 , the solid-sealed pole also includes a first incoming and outgoing wire seat 12 located on the side of the vacuum interrupter 14 of the circuit breaker and a second seat 12 located on the side of the vacuum interrupter 16 of the isolating switch. Two inlet and outlet wire seats 18. The moving end of the circuit breaker vacuum interrupter 14 (vacuum circuit breaker switch) is electrically connected to the first incoming and outgoing wire seat 12, and the moving end of the vacuum interrupter 16 of the isolation switch is electrically connected to the second incoming and outgoing wire seat 18, and the circuit breaker is vacuum interrupted The static end of the chamber 14 is electrically connected to the static end of the disconnector vacuum interrupter 16 .

The first incoming and outgoing wire seat 12 and the second incoming and outgoing wire seat 18 can be located at a variety of different positions on both sides of the vacuum interrupter 14 of the circuit breaker and the vacuum interrupter 16 of the isolating switch. The vacuum interrupter 14 and the vacuum interrupter 16 of the isolating switch are placed on both sides, so that the solid-sealed pole has a more uniform electric field distribution during use.

The solid-sealed pole of the medium-voltage switchgear according to the embodiment of the utility model has better heat dissipation performance due to the above-mentioned heat dissipation gap structure. It can allow a variety of currents of different sizes to pass through, and even if the circuit current is large (for example, 1250A current), it is not easy to crack, and it has good insulation reliability. Therefore, the embedded pole of the embodiment of the present utility model may be a 1250A embedded pole.

Isolation Switch Vacuum interrupter 16 can be equipped with a variety of different isolating switches, preferably, a three-position isolating switch can be installed, which has the advantages of compact structure, simple operation and accurate operation, and is conducive to further reducing the medium voltage. The volume of the solid-sealed pole of the switchgear.

As shown in Figure 1 again, the static end of the vacuum interrupter 14 of the circuit breaker is electrically connected to the static end of the vacuum interrupter 16 of the isolating switch through a flexible connection structure 19, and the flexible connection structure 19 is connected by a screw 13 (for example, in accordance with GB/T 70.2 standard hexagon socket head cap screws) are fixed on the static end of the vacuum interrupter 14 of the circuit breaker and the static end of the vacuum interrupter 16 of the isolating switch. A washer (for example in accordance with GB/T 97.1 standard) and a spring washer (for example in accordance with GB/T 93.1 standard) can also be provided between the screw 13 and the flexible connection structure, so that the vacuum interrupter 14 of the circuit breaker and the disconnector vacuum arc extinguish The chamber 16 is well connected, and even if the vacuum interrupter in the sealed casing expands slightly due to heat, the sealed casing will not be cracked. Wherein, the flexible connection structure 19 may be a flexible connection wire or a connection belt made of various metal materials.

One side of the isolating switch vacuum interrupter 16 (the side where the second inlet and outlet line holder 18 is located) can also be provided with an experimental terminal 17 electrically connected to the moving end of the isolating switch vacuum interrupter 16, and the experimental terminal extends out The sealed enclosure 11 is used for experiments.

Fig. 2 is a schematic cross-sectional view of a solid-sealed pole of a medium-voltage switchgear containing insulating pull rods according to an embodiment of the utility model. As shown in Figure 2, the moving end of the vacuum interrupter 14 of the circuit breaker is linked with the first insulating rod 23, the moving end of the vacuum interrupter 16 of the disconnector is linked with the second insulating rod 24, and the first insulating rod 23 and the second Two insulating pull rods 24 are arranged side by side and protrude from the sealed casing 11 .

In the embodiment of the utility model, the vacuum interrupter (the circuit breaker vacuum interrupter 14 and the isolation switch vacuum interrupter 16) and the insulating pull rod (the first insulating pull rod 23 and the second insulating pull rod 24) can pass through various Different ways of connection and linkage are preferably connected through the contact finger seat 21 and the coil spring 22, so that the insulating pull rod (the first insulating pull rod 23 and the second insulating pull rod 24) and the vacuum interrupter (circuit breaker vacuum Good contact between the arc extinguishing chamber 14 and the disconnector vacuum interrupter 16), the incoming and outgoing wire bases (the first incoming and outgoing wire bases 12 and the second incoming and outgoing wire bases 18).

The first insulating rod 23 and the second insulating rod 24 are surrounded by the sealed casing 11, and the inner surface corresponding to the sealed casing 11 can be a smooth surface, preferably in the shape of an umbrella skirt, which can greatly increase the creepage of the sealed casing distance to significantly improve the insulation reliability of the solid insulation structure (sealed enclosure).

The heat dissipation gap structure 20 between the vacuum interrupter 14 of the circuit breaker and the vacuum interrupter 16 of the isolating switch makes the vacuum interrupter 14 of the circuit breaker and the vacuum interrupter 16 of the isolating switch solidly sealed in the pole 1 of the medium voltage switchgear both connected with each other, and relatively independently sealed in the sealed shell 11, not only has better heat dissipation performance, but also, even if the internal components of the sealed shell expand due to heat, the sealed shell is not easy to crack.

The solid-sealed pole of the medium-voltage switchgear in the embodiment of the utility model can also make the vacuum interrupter chamber, the sealed casing and the surrounding air all have a uniform electric field distribution, and increase the insulation reliability of the solid-sealed pole.

Further, the sealing shell of the solid-sealed pole of the medium-voltage switchgear of the embodiment of the present invention can be provided with a plurality of inserts, such as inserts 15 (as shown in Figure 1), which can meet various assembly requirements, for example, the middle The solid-sealed pole of the high-voltage switchgear is fixed in the medium-voltage switchgear.

The solid-sealed pole of the medium-voltage switchgear according to the embodiment of the utility model insulates both the vacuum interrupter of the circuit breaker and the vacuum interrupter of the isolating switch through the solid insulation of the sealed shell, which reduces the volume of the solid-sealed pole. Moreover, the solid-sealed pole of the medium-voltage switchgear has a relatively symmetrical structure, which makes the electric field distribution in it more uniform, thereby increasing the insulation reliability of the solid insulation structure (sealed shell). In addition, the inner surface of the sealed casing around the insulating rod of the solid-sealed pole of the medium-voltage switchgear (the insulating rod of the circuit breaker and the disconnector) is in the shape of an umbrella skirt, which increases the creepage distance and further improves the solid insulation structure ( Sealed enclosure) insulation reliability.

The specific embodiments described above further describe the purpose, technical solutions and beneficial effects of the present utility model in detail. Within the protection scope of the utility model, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model shall be included in the protection scope of the utility model.

Claims (10)

1. A solid-sealed pole of a medium-voltage switchgear, characterized in that the solid-sealed pole includes a sealed shell formed by integral casting of epoxy resin, and a circuit breaker vacuum interrupter and a vacuum interrupter are arranged side by side in the sealed shell. A vacuum interrupter for an isolating switch, and a heat dissipation gap structure is provided between the vacuum interrupter for the circuit breaker and the vacuum interrupter for the isolating switch. 2. The solid-sealed pole of the medium-voltage switchgear according to claim 1, wherein the solid-sealed pole comprises a first inlet and outlet socket located on one side of the vacuum interrupter of the circuit breaker and a first socket located on the side of the vacuum interrupter. The second incoming and outgoing wire seat on the side of the vacuum interrupter of the isolating switch; the moving end of the vacuum interrupter of the circuit breaker is electrically connected to the first incoming and outgoing wire seat, and the moving end of the vacuum interrupter of the isolating switch is electrically connected to the The second incoming and outgoing wire seat, and the static end of the vacuum interrupter of the circuit breaker is electrically connected to the static end of the vacuum interrupter of the isolation switch. 3. The solid-sealed pole of the medium-voltage switchgear according to claim 2, wherein the static end of the vacuum interrupter of the circuit breaker and the static end of the vacuum interrupter of the isolating switch are electrically connected through a flexible connection structure. connect. 4 . The solid-sealed pole of a medium voltage switchgear according to claim 2 , wherein the first wire inlet and outlet sockets and the second wire inlet and outlet sockets are arranged symmetrically. 5. The solid-sealed pole of the medium voltage switchgear according to claim 2, characterized in that, one side of the vacuum interrupter of the isolating switch is also provided with an electrical connection with the moving end of the vacuum interrupter of the isolating switch The experimental terminal, and the experimental terminal protrudes from the sealed shell. 6. The solid-sealed pole of a medium-voltage switchgear according to claim 1, wherein the solid-sealed pole further comprises a first insulating tie rod and a second insulating tie rod, and the first insulating tie rod and the second insulating tie rod Two insulating pull rods are arranged side by side and protrude from the sealed casing. The moving end of the vacuum interrupter of the circuit breaker is linked with the first insulating pull rod, and the moving end of the vacuum interrupter of the isolating switch is connected with the second insulating pull rod. Pull rod linkage. 7 . The solid-sealed pole of a medium voltage switchgear according to claim 6 , wherein the inner surface of the sealing shell surrounding the first insulating pull rod and the second insulating pull rod is in the shape of an umbrella skirt. 8 . 8. The solid-sealed pole of the medium-voltage switchgear according to claim 6, wherein a three-position isolating switch is installed in the vacuum interrupter chamber of the isolating switch. 9. The embedded pole of a medium-voltage switchgear according to any one of claims 1 to 8, characterized in that the embedded pole is a 1250A embedded pole. 10. The solid-sealed pole of a medium-voltage switchgear according to claim 3, wherein the solid-sealed pole is a 1250A solid-sealed pole, and further includes a first insulating tie rod, a second insulating tie rod and an experimental terminal; Wherein, the first insulating pull rod and the second insulating pull rod are arranged side by side and extend out of the sealed casing, and the inner surface of the sealed casing surrounding the first insulating pull rod and the second insulating pull rod is an umbrella skirt shape, the moving end of the vacuum interrupter of the circuit breaker is linked with the first insulating rod, and the moving end of the vacuum interrupter of the disconnector is linked with the second insulating rod; the experimental terminal is located at the One side of the vacuum interrupter of the isolating switch extends out of the sealed shell, and is electrically connected with the moving end of the vacuum interrupter of the isolating switch; the first incoming and outgoing wire seat and the second incoming and outgoing wire seat are symmetrical ground setting; and a three-position isolating switch is installed in the vacuum interrupter chamber of the isolating switch.