KR20120111069A - Bellows for gas insulated switchgear - Google Patents

Abstract

PURPOSE: A bellows for a gas insulated switchgear is provided to minimize related structure of the gas insulated switchgear by including a small sized contact unit and to easily perform maintenance by simply separating a contact without eliminating an inserted contactor. CONSTITUTION: One end of a fixing unit(330) is combined with a back side of a frame. A contact unit(340) is combined with the other end of the fixing unit. The contact unit is formed into a cylinder shape. The contact unit provides current received from the fixing unit to a gas insulated switchgear. The contact unit comprises two pieces and a combination unit. The combination unit combines the two pieces. A frame(310) supports the outer shape of a bellows.

Description

Bellows for gas insulated switchgear {BELLOWS FOR GAS INSULATED SWITCHGEAR}

The disclosed technique relates to bellows, and more particularly to a bellows for a gas insulated switchgear which can be used for connection with a busbar of a gas insulated switchgear.

The gas insulated switchgear is a power switchgear used for indoor power plants and substations, and can safely protect the power system by opening and closing a line safely following an abnormal state such as a power accident or a short circuit. This gas insulated switchgear uses a bellows to connect the busbar and busbar, which are the main power lines of the power plant. However, the conventional bellows is inconvenient to separate and large in size because of the large contact that serves as a connector.

Among the embodiments, the bellows for the gas insulated switchgear includes a frame, a fixing portion and a contact portion. One end of the fixing part is coupled to the rear surface of the frame and conducts current provided from the bus bar. The contact part extends and is coupled to the other end of the fixing part, and has a hollow cylindrical shape having a film in the center thereof.

In one embodiment, the contact portion may be supplied to the gas insulated switchgear through the current provided from the fixing portion.

In one embodiment, the contact portion may include two pieces having an industrial shape in cross section and a coupler for joining the pieces.

In one embodiment, one end of the contact portion may be energized by the contact of the fixing portion is inserted, the other end may be energized by the contact of the gas insulated switchgear.

In one embodiment, the bellows may further include a pair of corrugated plates coupled horizontally to both terminals of the frame rear surface to absorb axial thrust.

1 is a cross-sectional view according to an embodiment of a gas insulated switchgear.
2 is a side view of a typical bellows used in a gas insulated switchgear.
3 is a cross-sectional view of one embodiment of a bellows for a gas insulated switchgear according to the disclosed technology.
4 is an exploded perspective view according to one embodiment of a cutaway contact.

The description of the disclosed technique is merely an example for structural or functional explanation and the scope of the disclosed technology should not be construed as being limited by the embodiments described in the text. That is, the embodiments may be variously modified and may have various forms, and thus the scope of the disclosed technology should be understood to include equivalents capable of realizing the technical idea.

Meanwhile, the meaning of the terms described in the present application should be understood as follows.

The terms "first "," second ", and the like are intended to distinguish one element from another, and the scope of the right should not be limited by these terms. For example, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

It should be understood that the term "and / or" includes all possible combinations from one or more related items. For example, the meaning of "first item, second item and / or third item" may be presented from two or more of the first, second or third items as well as the first, second or third item It means a combination of all the items that can be.

It is to be understood that when an element is referred to as being "connected" to another element, it may be directly connected to the other element, but there may be other elements in between. On the other hand, when an element is referred to as being "directly connected" to another element, it should be understood that there are no other elements in between. On the other hand, other expressions describing the relationship between the components, such as "between" and "immediately between" or "neighboring to" and "directly neighboring to", should be interpreted as well.

It should be understood that the singular " include "or" have "are to be construed as including a stated feature, number, step, operation, component, It is to be understood that the combination is intended to specify that it does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

In each step, the identification code (e.g., a, b, c, etc.) is used for convenience of explanation, the identification code does not describe the order of each step, Unless otherwise stated, it may occur differently from the stated order. That is, each step may occur in the same order as described, may be performed substantially concurrently, or may be performed in reverse order.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. Commonly used predefined terms should be interpreted to be consistent with the meanings in the context of the related art and can not be interpreted as having ideal or overly formal meaning unless explicitly defined in the present application.

1 is a cross-sectional view according to an embodiment of a gas insulated switchgear.

Referring to Figure 1, the gas insulated switchgear bus unit 110, busbar disconnector 120, current transformer 130, circuit breaker 140, repair grounding switch 150, line disconnector 160, line For example, the grounding switch 170 and the bushing 180 may be accommodated in a grounded metal housing, connected to each other, and a line may be formed through a conductor passing through each unit. Here, the gas insulated switchgear may be used as an insulating medium by filling an insulating gas having excellent insulation and extinguishing performance, such as SF ₆ gas.

The busbar 110 is connected to and fixed to the busbar, which is a main path through which electric power to be transmitted flows. That is, it is the part which connects the bus-bar of a power plant with the said gas insulation switchgear.

The main bus may be connected to the bus bar 110 through a bellows, and the bellows may perform a function of absorbing axial and axial perpendicular stretches while fixing the bus bar to the bus bar 110.

The bus disconnector 120 may disconnect a circuit from the bus 110 to the current transformer 130 to close the circuit in the no-load state.

The current transformer 130 may rectify the current flowing from the bus line 110.

The circuit breaker 140 may momentarily operate to cut off a current when an error occurs in the circuit. By the operation of the breaker 140, the converter or the main device can be protected.

Ground switch 150, 170 is a mechanical switch for grounding the converter. Grounding switch is a maintenance grounding switch 150 and the line grounding switch 170.

The line disconnector 160 may open or close the no-load circuit for completely removing the electrostatic part with a power supply or switching the water substation facility during the inspection and repair of the device.

Hereinafter, the bellows of the gas insulated switchgear will be described in more detail with reference to FIGS. 2 to 3.

2 is a side view of a typical bellows used in a gas insulated switchgear.

Referring to FIG. 2, the bellows includes a frame 210, a tie rod 220, a corrugated plate part 230, a fixing part 240, and a contact part 250.

The frame 210 supports the external shape of the entire bellows and is connected to the tie rod 220, the corrugated plate part 230, the fixing part 240, and the contact part 250 to support them.

The pair of tie rods 220 are vertically coupled to the frame 210. The pair of tie rods 220 are coupled to both ends of the pair of corrugated plate portions 230 to support the corrugated plate portion 230.

The corrugated plate portion 230 forms a corrugation as shown in the figure to elastically eliminate the force in the axial direction.

The fixing part 240 may be connected to the gas insulated switchgear by fixing the bus bar. Since the illustrated figure is a side view of the bellows for the three-phase busbar, there are three fixing parts 240 in total. The bus bar fixed to the fixing part 240 is connected to the main line of the gas insulated switchgear. In other words, the bus bar fixed to the fixing unit 240 electrically transmits a current to the main line.

The contact part 250 is connected to one end of the fixing part 240 and is coupled to the bus bar of the gas insulated switchgear. The contact unit 250 is formed of a hollow cylindrical conductor, and a contactor of a busbar of a gas insulated switchgear is inserted into the inner surface thereof to contact the bus to transmit current of the busbar to the busbar.

Since the contact portion 250 is required to have a predetermined length or more to secure a contact area, in order to release the connection state in the contact portion 250, the contactor of the inserted bus bar must be pulled out in the opposite direction. Therefore, a space corresponding to the length of the contact part 250 is required to completely remove the contactor inserted into the contact part 250, thereby increasing the internal structure of the bellows and the gas insulated switchgear.

3 is a cross-sectional view of one embodiment of a bellows of a gas insulated switchgear according to the disclosed technology.

Referring to FIG. 3, the bellows includes a frame 310, a corrugated plate part 320, a fixing part 330, and a contact part 340. Although there is no tie rod in the embodiment shown in FIG. 3, the tie rod may be further included according to the required force.

The frame 310 supports the overall shape of the bellows and is connected to the corrugated plate part 320, the fixing part 330, and the contact part 340 to support them. A three-phase bus bar may be connected to the front of the frame 310, and three fixing parts 330 and a pair of corrugated plate parts 320 may be connected to the rear of the frame 310.

The pair of corrugated plates 320 may be horizontally coupled to both terminals at the rear of the frame 310. The pair of corrugated plate portions 320 may absorb the thrust in the axial direction of the bellows. In one embodiment, the pair of corrugated plate portion 320 may be formed in a double corrugated structure to absorb greater thrust.

The fixing part 330 may have one end coupled to the rear surface of the frame 310 to fix the bus bar introduced through the frame 310. The fixing part 330 may be formed of a conductor, and may be provided to the contact part 340 by energizing a current provided from the bus bar. In other words, the current flowing out of the bus may flow to the main line of the gas insulated switchgear through the fixing part 330 and the contact part 340.

In one embodiment, the fixing part 330 may have a number corresponding to the image of the bus bar. For example, in the case of a three-phase bus bar, the fixing part 330 may be configured in three, and the contact part 340 extending and coupled to the fixing part may also be configured in three.

The contact part 340 may be coupled to one end of the fixing part 240 and the contactor of the bus bar. Here, the contact portion 340 may be composed of a non-cylindrical cut contact.

In one embodiment, the contact portion 340 may be composed of a cut-out contact made of a hollow cylindrical shape having a film in the center, which has a cross section of the work. In more detail, the contact portion 340 may be composed of a cut-out contact made of a shape corresponding to "part of bamboo including nodes".

In one embodiment, the cleaved contact can be separated into two pieces (pieces). In more detail, the cutaway contact is a shape similar to a "part of bamboo with a node at the center", which can be made by combining two pieces, similar to the half of the bamboo. In other words, the contact portion 340 may be composed of two pieces having an industrial shape in cross section and a coupler for joining the pieces.

The cutaway contact may be energized by contacting the contact of the fixing part 330 on one surface with the contact of the busbar part on the other surface of the central membrane. That is, contactors may be inserted into and contacted with respect to both sides of the central membrane, and may be disconnected when any one of them is separated from the inserted state.

The disclosed technique may have the following effects. It is to be understood, however, that the scope of the disclosed technology is not to be construed as limited thereby, as it is not meant to imply that a particular embodiment should include all of the following effects or only the following effects.

Bellows according to an embodiment employs a small contact portion, it is possible to reduce the associated structure of the gas insulated switchgear.

In addition, the bellows according to an embodiment has an effect of easy maintenance. This is because the contact of the bellows can be detachably separated, so that maintenance can be easily performed by simply removing the contact without removing the inserted contact.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit and scope of the present invention as set forth in the following claims It can be understood that

110: busbar 120: busbar disconnector
130: current transformer 140: breaker
150: repairing ground breaker 160: line disconnector
170: line grounding switch 180: bushing
210: frame 220: tie rod
230: corrugated plate portion 240: fixing portion
250: contact portion 310: frame
320: pleated plate portion 330: fixed portion
340: contact portion

Claims (5)

In the bellows for gas insulated switchgear, the bellows is
frame;
A fixing part having one end coupled to a rear surface of the frame and conducting current provided from a bus bar; And
A bellows for a gas insulated switchgear, which extends and is coupled to the other end of the fixing part, and includes a contact part formed in a hollow cylindrical shape having a membrane in the center thereof.
The method of claim 1, wherein the contact portion
A bellows for a gas insulated switchgear, characterized in that the current supplied from the fixed portion is supplied to the gas insulated switchgear.
The method of claim 1, wherein the contact portion
Two pieces of industrial shape in cross section; And
And a coupler for joining the pieces.
The bellows for gas insulated switchgear according to claim 3, wherein one end of the contact part is energized by inserting a contactor of the fixing part, and the other end is energized by inserting a contactor of the gas insulated switchgear.
The method of claim 1, wherein the bellows is
Further comprising a pair of corrugated plates coupled horizontally to both terminals on the rear surface of the frame to absorb the thrust in the axial direction.

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