KR20150002591U - Disconnecting Switch of Gas Insulated Switchgear - Google Patents

Abstract

The present invention relates to a disconnector of a gas insulated switchgear, and more particularly, to a disconnector of a gas insulated switchgear with improved conduction performance by applying a movable contact in the form of a tube.
The isolator of the gas insulated switchgear according to one embodiment of the present invention is a disconnector of a gas insulated switchgear including a movable conductor, a movable contact, a fixed conductor, and a fixed contact, wherein the movable contact comprises a body part; And a head portion formed in a disc shape.

Description

Disconnecting Switch of Gas Insulated Switchgear [

The present invention relates to a disconnector of a gas insulated switchgear, and more particularly, to a disconnector of a gas insulated switchgear with improved conduction performance by applying a movable contact in the form of a tube.

Generally, a gas insulated switchgear is installed on a circuit between a power supply side and a load side of an electric system, and when a circuit is open or closed in a normal current state or when an abnormal current such as a short circuit or a short circuit occurs on the circuit It is an electric device that protects the power system and load equipment by safely shutting off current.

Such gas insulated switchgear has a circuit breaker, a disconnecting switch, a ground switch, a bus, and a conductor in a sealed enclosure, which is normally filled with SF6 gas.

Here, the breaker is a main device that cuts off the circuit against an abnormal state such as an overload, a short circuit, etc., which is normally opened or closed manually or electrically, and automatically disconnects the circuit when an abnormality occurs. In addition, the earthing switch is installed at both ends of the circuit breaker and serves to ground the main circuit manually during maintenance and inspection and to remove the residual current in the conductors during maintenance and inspection. The disconnecting device is a device for opening and closing the circuit for changing the connection of the main circuit in a no load state (no load state) of the circuit breaker of the gas insulated switchgear.

FIG. 1 shows a disconnector of a gas insulated switchgear according to the prior art, and the disconnector is constructed as described above so as to be able to change the connection of a connected circuit in a state in which the flow of current is disconnected.

DISCONNECTING SWITCH is a device that corresponds to the main circuit of gas insulated switchgear (GIS). It should basically have short time current carrying capacity, insulation performance, charge current opening and closing performance, and especially gas insulated switchgear In a device (GIS), the temperature rise value should not rise above a specified value.

Figs. 1 and 2 show a disconnector internal structure of a 362 kV 50 kA 4000 A class gas insulated switchgear as an example of a high-capacity disconnector. The disconnecting device mainly comprises a movable contact 1, a fixed contact 3, a movable conductor 2, and a fixed conductor 4. Here, FIG. 1 shows a state in which a disconnecting switch is opened, and FIG. 2 shows a state in which the switch is closed.

In the steady state, the disconnector is caused to conduct current in the closed state as shown in Fig. At this time, the direction of the current flows in the order of the movable conductor 2 -> the movable contact 1 -> the fixed contact 3 -> the fixed conductor 4 in the reverse order.

In this structure, the current-carrying capacity generally depends on the cross-sectional area or the material of the movable contact 1. The movable contact 1 of the 362 kV 50 kA 4000 A class gas insulated switchgear is made of copper and the movable conductor 2 is made of aluminum.

Fig. 3 shows a movable contact 1 according to the prior art. Since the energizing capacity varies depending on the cross-sectional area or material of the movable contact 1, it has been common to change the design by increasing the diameter of the movable contact when the energizing capacity is to be increased. For example, in the steady-state 4000A class, rod-shaped movable contacts with a diameter of 60 mm and a cross-sectional area of 2,827 mm 2 were applied. In order to secure the energizing capacity of 6300 A, movable contacts having a diameter of 75 mm and a sectional area of 4,453 mm 2 were applied. At this time, the current density, i.e., the amount of current per unit area (A / mm 2) is 1.41 A / mm 2. However, when the movable contact 1 is raised according to the amount of electric power, there is a disadvantage that a lot of bubbles are generated (for example, 11.3kg to 17.9kg in the above case). As a result, the operating speed of the disconnecting device is lowered, which leads to lowering of the opening and closing performance of the charging current, thereby increasing the risk of earth fault. In addition, since the movable contact 1 is made of a material having a high price, there is a problem that the cost of parts also increases.

The object of the present invention is to solve the above-mentioned problems, and it is an object of the present invention to provide a circuit breaker which is made lightweight while having electrification performance and insulation performance by using a movable contact made of a tubular- .

The isolator of the gas insulated switchgear according to one embodiment of the present invention is a disconnector of a gas insulated switchgear including a movable conductor, a movable contact, a fixed conductor, and a fixed contact, wherein the movable contact comprises a body part; And a head portion formed in a disc shape.

Here, an insertion groove is formed in a lower portion of the movable contact so as to be coupled to the inner conductor of the movable part.

In addition, a gas groove is formed in a part of the head to allow gas to flow in and out.

In addition, a coupling groove is formed on the lower surface of the head portion so as to be easily coupled to the body portion along the rim.

In addition, an arc-shaped protrusion is formed on an upper surface of the head portion along a rim.

According to the disconnecting device of the gas insulated switchgear according to one embodiment of the present invention, the movable contact made up of the body portion formed in a tubular shape and the head portion formed in a flat plate is used to improve the electrification performance.

As a result, the movable contact is lightened, and the opening and closing performance is excellent and the cost of parts is reduced.

1 shows an open state of a gas insulated switchgear disconnector according to the prior art.
2 shows a closed state of a gas insulated switchgear disconnector according to the prior art.
3 is a longitudinal sectional view (a) and a cross-sectional view (a) of a movable contact applied to a conventional gas insulated switchgear disconnector.
4 shows an open state of a gas insulated switchgear disconnector according to one embodiment of the present invention.
5 shows a closed state of a gas insulated switchgear disconnector according to an embodiment of the present invention.
6 is a longitudinal sectional view of a movable contact applied to a gas insulated switchgear disconnector according to an embodiment of the present invention.
7 is a longitudinal sectional view (a) of the body portion in FIG. 6, and FIG. 7 (b) is a transverse sectional view thereof.
8 is a cross-sectional view (a) of the head and a plan view of FIG. 6 (b).

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, which are intended to illustrate the present invention in such a manner that a person skilled in the art can easily carry out the present invention. And does not mean that the technical idea and category of the design is limited.

The isolator of the gas insulated switchgear according to an embodiment of the present invention is a disconnector of a gas insulated switchgear including a movable conductor, a movable contact, a fixed conductor, and a fixed contact, wherein the movable contact (20) A body portion 21 to be formed; And a head 26 formed in a disk shape.

Fig. 4 shows an open state of a gas insulated switchgear disconnector according to an embodiment of the present invention, and Fig. 5 shows a closed state. 6 is a longitudinal sectional view of a movable contact applied to a gas insulated switchgear disconnector according to an embodiment of the present invention. Fig. 7 is a longitudinal sectional view of the body part in Fig. 6, Fig. 8 (b) is a transverse sectional view thereof, Fig. 8 is a sectional view of the head part in Fig. 6, and Fig. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

The disconnecting device 100 is provided in a main bus, a branch circuit, or a load circuit, and is a device for changing connection of each circuit in a no-load state, that is, in a state in which no current flows. 4, in the opened state, the movable contact 20 of the movable conductor 10 is separated from the fixed contact 40 of the fixed conductor 30, so that no current flows. At this time, it is possible to change circuit connections on the main bus or the load side where the disconnecting device 100 is installed.

When the gear formed on a part of the insulating rod 51 is rotated by the driving force generated by the moving part 50, the moving part internal conductor 11 linearly moves left and right. Accordingly, the movable contact 20, which is coupled to the movable conductor 11, is coupled to or separated from the fixed contact 40.

5, in the closed state, the movable contact 20 of the movable conductor 10 is coupled to the fixed contact 40 of the fixed conductor 30, and current flows. Here, the direction of current flow is the direction of current flow from the movable conductor 10 to the movable contact 20 to the fixed conductor 30 to the fixed contact 40 or to the fixed contact 40 to the fixed conductor 30 to the movable contact 20, - > movable part conductor 10.

It is preferable that the movable contact 20 is made of copper having excellent electrical conductivity.

The movable contact 20 is composed of a body portion 21 and a head portion 26. The body portion 21 is formed in a circular tube shape. The current flow in the conductor is proportional to the cross-sectional area and material of the conductor. Therefore, if the materials are the same, the current flows in proportion to the cross-sectional area. However, the current tends to concentrate on the outer peripheral surface of the conductor. That is, in the case of a conductor having a circular cross section, the current flows radially outward from the center portion. Therefore, when the tube is in the form of a tube, the loss of the amount of electricity is not large compared to the shape of the rod. Furthermore, when a pipe having a slightly larger diameter is applied to the rod, the amount of electric current to be supplied is increased. For example, a conductor with a diameter of 75 mm has a cross-sectional area of 4,453 mm 2 and a current density of 1.41 A / mm 2 when a current of 6,300 A flows in a steady state. However, in the case of a tube-shaped conductor having an outer diameter of 100 mm and an inner diameter of 70 mm, the cross-sectional area is 4,006 mm 2, but a current density of 1.57 A / mm 2 is exhibited when a current of 6,300 A flows in a steady state. That is, when the rod-shaped conductor is changed into the tube-shaped conductor and the outer diameter is appropriately enlarged, it is possible to achieve the weight reduction according to the reduction in the cross-sectional area, but the amount of electric current can be increased rather.

As described above, since the body portion 21 of the movable contact 20 is made of a tube, the current density can be increased and the weight can be reduced. As a result, the cost of parts is reduced.

An insertion groove 22 for coupling with the movable conductor 11 may be formed on the lower portion of the body 21.

The head portion 26 is coupled to the upper portion of the body portion 21. The head portion 26 is formed in a disc shape. As the head portion 26 is coupled to the body portion 21, the movable contact 20 is repeatedly brought into contact with and separated from the stationary contact 40, so that wear and deformation that are likely to occur in the contact portion can be reduced. In addition, the shape of the movable contact 20 can be maintained without being deformed.

A gas groove 27 may be formed in a part of the head part 26, preferably at a central part thereof, so that the gas can flow in and out. A gas such as SF6 is filled in the isolator 100 for arc extinguishment, and such gas can interfere with the movement of the movable contact 20. As the gas can freely flow into the movable contact 20, the movable contact 20 can move smoothly.

A coupling groove 28 may be formed on the lower surface of the head 26 so as to be easily engaged with the body 21 along the rim. The coupling groove 28 may be formed to have a width corresponding to the thickness of the body portion 21. [ Accordingly, as the head 26 is partially inserted into the body 21, the coupling force can be increased. The head portion 26 can be joined by welding while the engaging groove 28 is fitted in the upper end portion of the body portion 21. [ At this time, brazing welding or the like may be applied. As the head portion 26 and the body portion 21 are welded together, the movable contacts 20 are integrated into one.

An arc-shaped protrusion 29 may be formed on the upper surface of the head 26 along the rim. A protrusion 29 having an arc-shaped cross section is formed annularly along the rim. Accordingly, when the movable contact 20 contacts the fixed contact 40, it is possible to smoothly insert the movable contact 20 while reducing the friction, thereby reducing the wear of the movable contact 20 and reducing the contact failure. In addition, since the engaging groove 28 is formed, the strength of the outer frame portion, which can be weakened, can be increased.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it will be apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the invention, It is obvious that the claims fall within the scope of the claims.

10 Movable part conductor 11 Movable part internal conductor
20 movable contact 21 body
22 insertion groove 26 head
27 Gas groove 28 Coupling groove
29 protrusion 30 fixed conductor
40 fixed contact 50 movable part
51 Insulation rod 100 isolator

Claims (5)

A disconnecting switch for a gas insulated switchgear comprising a movable conductor, a movable contact, a fixed conductor, and a fixed contact,
The movable contact
A body portion formed in a tube shape; And
And a head part formed in a disk shape.
The disconnector of the gas insulated switchgear according to claim 1, wherein an insertion groove is formed in a lower portion of the movable contact so as to be coupled to a conductor inside the movable portion.
The breaker of claim 2, wherein a gas groove is formed in a part of the head to allow gas to flow in and out.
3. The separator according to claim 2, wherein an engaging groove is formed on a lower surface of the head portion so as to be easily engaged with the body portion along a rim.
The disconnector of the gas insulated switchgear according to claim 2, wherein an arc-shaped protrusion is formed on an upper surface of the head portion along a rim.

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