JP3232423U - Gas insulation switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas-insulated switchgear having a simple structure, low cost, and highly efficient heat transfer and heat dissipation performance. SOLUTION: A gas-insulated switchgear 10 includes a closed housing 11 and a plurality of electric devices housed in the closed housing. At least one electrical device includes a closed chamber and a plurality of conductive elements arranged in the closed chamber and connected to each other. The at least one conductive element includes a wall 13 that defines a hollow cavity, and openings 14a and 14b are opened in the wall to form a heat dissipation passage that communicates the inside and the outside of the conductive element. The openings are at least two and are provided symmetrically or evenly spaced along the cross section of the conductive element. Since the heat convection can be accelerated by the heat dissipation passage, the change in the structure of the conductive element is small, and the overall size of the conductive element does not need to be changed, the mechanical strength or the conductive performance is not adversely affected. [Selection diagram] Fig. 1

Description

Technical Field This utility model relates to the technical field of high-voltage switchgear, and more specifically to gas-insulated switchgear.

Background Technology A gas-insulated switchgear (GIS) is a compact switchgear sealed with metal, and is composed of elements such as a circuit breaker, a circuit breaker, and a bus sealed in a metal container. Since the inside of the metal container is filled with insulating gas, it can operate safely in a closed space. Due to the small footprint and high reliability of the GIS, it can provide a clever solution for complex switch applications and is suitable for densely populated areas, urban planning and harsh environments.

Since the gas-insulated switchgear is completely sealed, the internal temperature rise is high and heat is dissipated only by the air outside the gas chamber. Therefore, when operating for a long time under a high current load, heat is gradually accumulated and the temperature inside the gas chamber rises rapidly. According to the regulations for high voltage switch products of international electrical standards or national standards, the temperature rise value under test current of conductors or other conductive members shall not exceed 65K or 75K. Therefore, in the product design stage, the heat dissipation performance of the product, mainly the decrease in heat generation and the increase in heat dissipation, should be fully considered. Currently, the solutions to reduce the GIS temperature rise are as follows: increasing the size of the part, increasing the electrical contact area, changing the material of the part, optimizing the connection structure. It can be summarized as doing or adding a radiator or the like. However, most of these solutions cause increased material or design costs, so there is a need to provide efficient, reliable and low cost heat dissipation means.

Contents of the utility model The purpose of this utility model is to overcome the drawbacks existing in the above-mentioned prior art and to provide a gas-insulated switchgear. Since the gas-insulated switchgear of the utility model has an improved heat dissipation structure, it is possible to effectively reduce the temperature rise of the product at low cost.

Therefore, the utility model provides a gas-insulated switchgear. The gas-insulated switchgear includes a closed housing and a plurality of electrical devices housed in the closed housing. Of the plurality of electrical devices, at least one electrical device includes a closed chamber and a plurality of conductive elements arranged in the closed chamber and connected to each other. Of the plurality of conductive elements, at least one conductive element includes a wall defining a hollow cavity, and the wall is provided with an opening to form a heat radiation passage communicating the inside and the outside of the conductive element. The openings are at least two and are provided symmetrically or evenly spaced along the cross section of the conductive element.

Based on the above technical device, the utility model may further include one or more alternative forms:

In some alternative forms, the openings are provided in the cross section of the connection site or the conductive element adjacent to the connection site, or in the cross section of the region where the electric field distribution of the conductive element is uniform.

In some alternative forms, the openings are provided along a plurality of cross sections of the conductive element, the plurality of cross sections being distributed along the longitudinal direction of the conductive element.

In some alternative forms, the openings are provided in a circular, rectangular, or oval shape.
In some alternative forms, the electrical device includes a circuit breaker, the circuit breaker includes a circuit breaker housing and a shield cover sealed within the circuit breaker housing, and an opening is provided in the shield cover. It is the first heat dissipation port.

In some alternative forms, the first heat dissipation port is a circular hole provided in a region where the electric field distribution is uniform along the cross section of the shield cover.

In some alternative embodiments, the electrical device comprises a cutoff switch, the cutoff switch comprises a cutoff switch housing and a movable conductor sealed within the cutoff switch housing, and an opening is provided in the movable conductor. It is the second heat dissipation port.

In some alternative forms, the second radiator is a rectangular or oval groove provided at or adjacent to the connection site along the cross section of the movable conductor, the rectangular groove or length. The circular groove extends along the horizontal or vertical direction of the movable conductor, or extends diagonally with respect to the horizontal or vertical direction of the movable conductor.

In some alternative forms, the electrical device includes a bus, the bus is a contact holder and a conductive rod that are articulated to each other and the articulated ends are covered with a shield cover, and the openings are the contact holder and / or This is a third heat dissipation port provided on the conductive rod.

In some alternative forms, the third vent is a circular hole provided at or adjacent to the connection site along the cross section of the contact holder and / or conductive rod.

In this utility model, heat convection can be accelerated by forming a heat dissipation passage, and since changes to the structure of the conductive element are small and it is not necessary to change the overall size of the conductive element, mechanical strength or conductive performance can be improved. Does not have an adverse effect. The utility model gas-insulated switchgear has a simple structure, low cost, and high-efficiency heat transfer and heat dissipation performance, so it is expected to be widely applied.

Other features and advantages of the Utility Model will be better understood through alternative embodiments detailed with reference to the drawings below. In the drawings, similar reference numerals indicate similar or similar members.

It is a plan schematic diagram of the circuit breaker which has a heat dissipation structure according to one Embodiment of this utility model. It is a perspective schematic view after removing the housing of the circuit breaker of FIG. It is sectional drawing of the cutoff switch which has a heat dissipation structure according to one Embodiment of this utility model. It is a perspective schematic view after removing the housing of the cutoff switch of FIG. It is a plane schematic diagram of the bus having a heat dissipation structure according to one Embodiment of this utility model.

Specific Embodiments Hereinafter, the implementation and use of the examples will be described in detail. It should be understood that the specific embodiments described merely illustrate specific methods for implementing and using the Utility Model and do not limit the scope of the Utility Model. is there. Representations that describe the structural position of each component, such as top, bottom, top and bottom, are relative rather than absolute. When arranging each member as shown in the drawing, the expression describing these positions is appropriate, but when changing the position of each member shown in the drawing, the expression describing these positions is changed accordingly. To do.

In the present utility model, the "horizontal direction" refers to a direction substantially perpendicular to the longitudinal direction of the element or member, and the "vertical direction" refers to a direction substantially parallel to the longitudinal direction of the element or member.

A gas insulated switch generally includes a closed housing and a plurality of electrical devices housed in the closed housing, and at least one of the plurality of electrical devices is the closed chamber and the inside of the closed chamber. Includes a plurality of conductive elements arranged in and connected to each other. Of course, conductive elements include, but are not limited to, elements such as circuit breakers, circuit breakers and buses. The idea of this utility model is to reduce the temperature rise of the conductive element by providing a heat dissipation structure in the conductive element of the gas-insulated switchgear. This heat dissipation structure does not add additional members and does not affect the energization performance of the conductive elements, while the connection points of each conductive element, especially the sliding connection points, the structure is complicated, the energization cross section is small, and heat is generated. It can be installed in a place where gas convection is bad or where it is easy.

Therefore, in the solution of the present practical novel, at least one of the plurality of conductive elements includes a wall defining a hollow cavity, and the wall is provided with an opening to communicate the inside and the outside of the conductive element. The heat dissipation passages are formed, and the openings are at least two and are provided symmetrically or evenly spaced along the cross section of the conductive element. Of course, since openings are opened in the wall of the conductive element, the number and size of the openings need to consider the influence on the structural strength of the entire conductive element. In the description given with reference to the drawings below, the number, shape and size of openings are merely exemplary and not limiting. In a preferred embodiment, the openings are provided in pairs. This allows for the favorable formation of gas convection and the rapid dissipation of heat. Further, on the premise that the mechanical strength is not affected, the openings are provided along the plurality of cross sections of the conductive element, and the plurality of cross sections are distributed along the longitudinal direction of the conductive element.

The embodiment shown in FIGS. 1 and 2 exemplifies the circuit breaker 10. The circuit breaker 10 includes a circuit breaker housing 11, an insulating tube 12 sealed in the circuit breaker housing 11, and a shield cover 13. In some embodiments, the openings are a plurality of first heat dissipation ports provided in the shielding cover 13, and these first heat dissipation ports have a uniform electric field distribution along the cross section of the shield cover 13. It is a circular hole provided in the area. It should be understood that even if the opening is provided in the region where the electric field distribution is uniform, the electromagnetic shielding performance of the shield cover is not adversely affected. That is, even if there is an opening, the change in the electric field distribution in the shield cover is small or negligible.

In the embodiment shown in FIG. 1, the first heat radiating port may be circular holes 14a and 14b symmetrically provided along the cross section of the shielding cover 13. There may be one circular hole 14a or 14b, or a plurality of circular holes 14a or 14b, for example, two as shown in the figure. In the embodiment shown in FIG. 2, the first heat radiating port may be a plurality of circular holes 14c provided at equal intervals along the cross section of the shielding cover 13. This accelerates gas convection inside and outside the shielding cover 13 and avoids forming a high temperature closed region in the cavity of the shielding cover 13. As mentioned above, the number and size of the circular holes 14a, 14b, 14c depend on the effect of the shield cover 13 on the mechanical strength. Therefore, when machining a circular hole, it is necessary to select a portion where the surface is smooth and the strength is stable in order to reduce the machining difficulty.

The embodiment shown in FIGS. 3 and 4 exemplifies the cutoff switch 20. The cutoff switch 20 includes a cutoff switch housing 21 and a movable conductor 22 sealed in the cutoff switch housing 21. The movable conductor 22 is supported by the movable side bracket 25 and the fixed side bracket 26, and is shielded by the movable side shield cover 23 and the fixed side shield cover 24, respectively. In this embodiment, in order to reduce the temperature rise of the movable conductor 22 which is slidably connected, the opening for heat dissipation is a second heat dissipation port provided in the movable conductor 22. Specifically, the second heat radiating port is a groove 27a, 27b symmetrically provided at the connecting portion or adjacent to the connecting portion along the cross section of the movable conductor 22. In the embodiment shown in FIG. 4, the groove 27a is an oval groove, but it may be provided in a rectangular groove or a circular hole. In an alternative embodiment, the grooves 27a, 27b may extend laterally or longitudinally to the movable conductor 22, or may extend obliquely with respect to the lateral or longitudinal direction of the movable conductor 22. Good. In some embodiments, the shielding cover 23 may be provided with a heat dissipation port, which may be similar to the first heat dissipation port described above.

In the embodiment shown in FIG. 5, the bus 30 is illustrated. The bus 30 includes a contact holder 33 and a conductive rod 32 which are connected to each other and whose connecting ends are covered with a shield cover 31. In order to prevent damage due to collision when the contact holder 33 and the conductive rod 32 are connected, a cushion 35 is provided at one end of the contact holder 33 facing the conductive rod 32, and an insulating support is provided at the other end of the contact holder 33. 34 is provided. In some embodiments, the opening for heat dissipation is a third heat dissipation port provided on the contact holder 33 and / or the conductive rod 32. Alternatively, the third heat dissipation port may be a circular hole provided at or adjacent to the connection site along the cross section of the contact holder 33 and / or the conductive rod 32. For example, as shown in FIG. 5, the third heat dissipation port may be circular holes 36a, 36b, 36c uniformly provided along the cross section of the contact holder 33, and these circular holes are conductive rods. It may be provided adjacent to 32. In some embodiments, similar circular holes may be provided along the cross section of the conductive rod 32, and these circular holes may be provided adjacent to the contact holder 33. In some embodiments, a similar heat dissipation port may be provided at the connection portion between the contact holder 33 and the conductive rod 32. In an alternative embodiment, the shield cover 31 may be provided with a circular heat dissipation port as well as the first heat dissipation port.

By adopting various embodiments of the above-mentioned practical novel and adding a convection opening to the conductive element (for example, a movable conductor or a shield cover), gas convection in the conductive element chamber can be accelerated, and the conductive element can be accelerated. The temperature rise can be reduced and the internal temperature distribution of the gas-insulated switchgear can be made more uniform. Taking the bus 30 shown in FIG. 5 as an example, the bus 30 provided with the circular holes 36a, 36b, 36c of the present utility model can obtain a temperature drop rate of at least 5 to 15% as compared with the conventional bus. The temperature rise of the electrical connection structure can be effectively reduced. This allows the electrical connection structure to withstand a larger current and improve the energizing capacity of the bus.

Although specific electric elements of the gas-insulated switchgear have been described as examples in each embodiment, more excellent heat dissipation effect can be obtained by combining the electric elements having a heat dissipation structure with each other. Further, in each of the above embodiments, for example, a circular, rectangular or oval opening can be formed in the conductive element by using any known processing method, the processing process is simple, and the additional cost is low. Since the opening has almost no effect on the electric field and electromagnetic shielding effects, the mechanical strength of the component can be guaranteed, the weight of the component can be reduced, and good application can be expected.

The selectable shapes, dimensions, and arrangement methods of each selectable member of the utility model gas-insulated switchgear of the embodiment shown in the drawings are merely exemplary and not limited. Other shapes, dimensions and arrangements can be adopted without departing from the idea and scope of this utility model.

The technical contents and technical features of the Utility Model have been disclosed above, but it should be understood that those skilled in the art will make various changes to the device disclosed above based on the creative idea of the Utility Model. Improvements may be made and all of these changes and improvements are within the scope of this Utility Model. The description of the above embodiments is exemplary and not limiting. The scope of protection of this utility model is determined by the scope of the utility model registration claims.

Claims (10)

It is a gas-insulated switchgear
With a sealed housing
Including a plurality of electrical devices housed in the sealed housing.
Of the plurality of electrical devices, at least one electrical device includes a closed chamber and a plurality of conductive elements arranged in the closed chamber and connected to each other.
Of the plurality of conductive elements, at least one conductive element includes a wall defining a hollow cavity.
An opening is opened in the wall to form a heat dissipation passage that communicates the inside and the outside of the conductive element.
A gas-insulated switchgear having at least two openings and provided symmetrically or evenly spaced along the cross section of the conductive element. The gas insulation according to claim 1, wherein the opening is provided in a connection portion of the conductive element or a cross section adjacent to the connection portion, or is provided in a cross section of a region where the electric field distribution of the conductive element is uniform. Opening and closing device. The opening is provided along a plurality of cross sections of the conductive element.
The gas-insulated switchgear according to claim 2, wherein the plurality of cross sections are distributed along the longitudinal direction of the conductive element. The gas-insulated switchgear according to claim 2, wherein the opening is provided in a circular shape, a rectangular shape, or an oval shape. The electrical device includes a circuit breaker (10).
The circuit breaker (10) includes a circuit breaker housing (11) and a shield cover (13) sealed in the circuit breaker housing (11).
The gas-insulated switchgear according to any one of claims 1 to 4, wherein the opening is a first heat dissipation port provided in the shield cover (13). The gas according to claim 5, wherein the first heat radiation port is a circular hole (14a, 14b, 14c) provided in a region where the electric field distribution is uniform along the cross section of the shield cover (13). Insulated switchgear. The electrical device includes a cutoff switch (20).
The cutoff switch (20) includes a cutoff switch housing (21) and a movable conductor (22) sealed in the cutoff switch housing (21).
The gas-insulated switchgear according to any one of claims 1 to 4, wherein the opening is a second heat dissipation port provided in the movable conductor (22). The second heat radiation port is a rectangular groove or an oval groove (27a, 27b) provided at the connection portion or adjacent to the connection portion along the cross section of the movable conductor (22).
The rectangular groove or the oval groove extends along the lateral or longitudinal direction of the movable conductor (22), or extends obliquely with respect to the lateral or longitudinal direction of the movable conductor (22). , The gas-insulated switchgear according to claim 7. The electrical device includes a bus (30).
The bus (30) includes a contact holder (33) and a conductive rod (32) that are connected to each other and whose connecting ends are covered with a shield cover (31).
The gas-insulated switchgear according to any one of claims 1 to 4, wherein the opening is a third heat dissipation port provided in the contact holder (33) and / or the conductive rod (32). The third heat dissipation port is a circular hole (36a, 36b, provided at the connection portion or adjacent to the connection portion along the cross section of the contact holder (33) and / or the conductive rod (32). 36c) The gas-insulated switchgear according to claim 9.

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