KR20210144620A - Gas Insulated swatchgear having embedded collecting panel for partial discharge - Google Patents

Abstract

Disclosed is a gas insulated switchgear having a built-in partial discharge assembly panel capable of preventing attenuation of a partial discharge signal. The gas insulated switchgear is made of a front panel, a side panel and a rear panel, wherein an assembly panel connected to a partial discharge sensor by a coaxial cable is installed on a lower plate of the rear panel. According to the present invention, it is possible to prevent attenuation of the partial discharge signal due to reduction in a length of the coaxial cable according as the assembly panel is built-in and utilizes a free space at a rear surface of the gas insulated switchgear.

Description

Gas Insulated swatchgear having embedded collecting panel for partial discharge}

* The present invention relates to an insulated switchgear, and more particularly, to a gas insulated switchgear having a built-in partial discharge assembly board.

Finally, electricity is supplied to customers through the 22.9kV Gas Insulated Swatchgear (GIS), one of the facilities in the substation. Insulated switchgear is a type of facility that is integrated with a circuit breaker, disconnector, and ground switch in a cylindrical structure, and SF6 Gas is used as the internal insulation medium. This is gradually decreasing due to future environmental regulations, and eco-friendly switchgear is being developed to replace it.

EGIS (Environment-Friendly Gas Swatchgear), one of the eco-friendly switchgear, is an eco-friendly switchgear that has an internal insulation medium in the form of dry air and is not subject to environmental regulations. In the EGIS, a PD (Partial Discharge) sensor for measuring partial discharge is attached at an appropriate location for each device to prevent failure through internal partial discharge measurement.

The PD sensor is attached to each device, and when an internal abnormal situation occurs (floating electrode, insulator defect, free conductor, protruding electrode), it can transmit a waveform suitable for the corresponding discharge characteristic to prevent progress to failure in advance.

The coaxial cable of the PD sensor installed for each device is called a channel. It is given one channel per device, and for convenience of measurement, it is made in the form of a group and consists of 6 or 12 channels. In particular, this assembly group is separately installed and operated outside.

Accordingly, there is a problem in that the length of the coaxial cable corresponding to each channel is increased according to the installation position of the assembly panel, and the partial discharge signal is attenuated by the increased length.

In addition, the cost of the extended coaxial cable length and the cost of a separate enclosure (about 400mm X 700mm) production cost increase due to the installation of a separate assembly panel and the installation of an external duct to prevent damage to the coaxial cable There is a problem with the need.

In addition, as the assembly panel is installed separately from the gas insulated switchgear, there is a problem in that the interference occurs instantaneously by the equipment inspector according to the narrowness of the installation place.

1. Korea Patent No. 10-1006019 (Registration Date: 2010.12.29)

The present invention has been proposed to solve the problems according to the above background art, and an object of the present invention is to provide a gas insulated switchgear having a built-in partial discharge assembly panel capable of preventing attenuation of a partial discharge signal.

In addition, the present invention provides a gas insulated switchgear having a built-in partial discharge assembly panel that does not require the installation of an external duct to increase the manufacturing cost of a separate enclosure and/or to prevent damage to the coaxial cable. Another purpose there is this

In addition, another object of the present invention is to provide a gas insulated switchgear having a built-in partial discharge assembly panel capable of preventing the instantaneous interference of the equipment inspector.

The present invention provides a gas insulated switchgear having a built-in partial discharge assembly panel capable of preventing the attenuation of a partial discharge signal in order to achieve the object presented above.

The gas insulated switchgear,

A gas insulated switchgear comprising a front panel, a side panel and a rear panel, characterized in that an assembly panel connected to a partial discharge sensor and a coaxial cable is installed on a lower plate of the rear panel.

In addition, a space is formed on the inner surface of the lower plate by a first plate and a second plate disposed at a predetermined interval from the first plate.

In addition, it is characterized in that a plurality of connector mounting terminals are installed on the front side of the door of the assembly board.

In addition, the plurality of connector mounting terminals are characterized in that the coaxial cable connection N-type connector mounting terminals.

In addition, it is characterized in that a plurality of opening and closing terminal caps for opening and closing the plurality of connector mounting terminals are installed in front of the door.

In addition, the plurality of opening and closing terminal caps are characterized in that they are connected by a line.

In addition, a door handle capable of opening and closing is installed on the front of the door.

In addition, a hollow into which the coaxial cable is inserted is formed, and a duct having an end surface coupled to the rear surface of the assembly panel is installed in the space.

In addition, the duct is characterized in that the central cross-section is "a" shape.

According to the present invention, it is possible to prevent the attenuation of the partial discharge signal due to the reduction in the length of the coaxial cable as the assembly panel is built-in and utilizes the free space at the rear of the gas insulated switchgear.

In addition, as another effect of the present invention, there is no need to install a separate enclosure manufacturing cost and/or an external duct to prevent damage to the coaxial cable, so cost can be reduced.

In addition, as another effect of the present invention, it is possible to solve the limitation of the installation space and improve the convenience of the inspector.

1 is a front view of a gas insulated switchgear according to an embodiment of the present invention.
FIG. 2 is a rear view of the gas insulated switchgear shown in FIG. 1 .
3 is a side view of the gas insulated switchgear shown in FIG. 1 .
FIG. 4 is a front view of the assembly board shown in FIG. 3 .
5 is a conceptual diagram illustrating a duct installed in the gas insulated switchgear shown in FIG. 3 and a coaxial cable connected therethrough.

Since the present invention can have various changes and can have various embodiments, specific embodiments are illustrated in the drawings and will be described in detail in the detailed description. However, this is not intended to limit the present invention to a specific embodiment, it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

In describing each figure, like reference numerals are used for like elements. The terms first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component. The term “and/or” includes a combination of a plurality of related listed items or any of a plurality of related listed items.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. shouldn't

Hereinafter, a gas insulated switchgear having a built-in partial discharge assembly board according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a front view of a gas insulated switchgear 100 according to an embodiment of the present invention. Referring to FIG. 1 , the gas insulated switchgear 100 includes a front panel 110 and a side panel 120 . The front panel 110 includes an operation panel, a handle for opening and closing, and the like, and the side panel 120 includes disconnectors (EDS and DS units).

FIG. 2 is a rear view of the gas insulated switchgear 100 shown in FIG. 1 . Referring to FIG. 2 , a rear panel 200 may be configured on the rear surface of the gas insulated switchgear 100 . An empty space is formed under the rear panel 200 . There are no interfering accessories other than the iron exterior in this empty space.

3 is a side view of the gas insulated switchgear 100 shown in FIG. 1 . 3 is a state in which the side panel 120 and the rear panel 200 are removed for convenience of understanding. Of course, these side panels 120 and rear panels 200 may not exist depending on the design. A disconnector 330 may be installed on the side panel 120 .

The rear panel 200 may include an upper plate (not shown) and a lower plate 310 . The assembly board 210 is installed on the lower plate 310 .

A space 301 is formed on the inner surface of the lower plate 310 by a first plate 320-1 and a second plate 320-2 disposed at a predetermined interval from the first plate 320-1. In other words, the first plate 320-1 and the second plate 320-2 are combined with the inner surface of the lower plate 310 to form a rectangular space 301 . That is, the first plate 320-1 and the second plate 320-2 are coupled between the two lower plates at a predetermined interval. The connection may be by welding, or it may be a bolting method using bolts and nuts.

FIG. 4 is a front view of the assembly board 210 shown in FIG. 3 . Referring to FIG. 4 , the size of the assembly board 210 is about 270 mm in width and about 370 mm in length. A plurality of connector mounting terminals 430 are installed on the door front 410 of the assembly board 210 . Although terminals for 12 channels are illustrated in the drawing, the present invention is not limited thereto, and 6 channels, 9 channels, etc. are also possible.

The connector mounting terminal 430 may be a coaxial cable connection N-type connector mounting terminal. In particular, the terminal cap 431 for opening and closing may be configured to prevent foreign substances from entering the connector mounting terminal 430 . In other words, the closer you get to the ground, the higher the probability that foreign substances such as dust and water droplets will occur. Therefore, it is necessary to prevent its inflow. The opening/closing terminal cap 431 is fixedly attached to the door front 410 with a string 431-1.

A door handle 411 is installed on the door front 410 . The door handle 411 functions as a locking device and handle capable of opening and closing. In other words, the spring is connected to one end of the door handle 411, and as the door handle 411 slides, the protrusion (not shown) is inserted or separated into the recess (not shown). Since such a structure is well known, further description will be omitted.

In addition, a power supply plug 420 is installed to supply power to a PD (Partial Discharge) sensor (not shown). The power supply plug 420 is an AC (Alternating Current) 220V power plug. The power supply plug 420 is shown as a two-prong, but is not limited thereto.

5 is a conceptual diagram in which the duct 510 installed in the gas insulated switchgear shown in FIG. 3 and the coaxial cable 520 are connected through the duct 510. Referring to FIG. Referring to FIG. 5 , a duct 510 is installed in a space 301 . In other words, the end surface of the duct 510 is closely coupled to the rear surface of the assembly board 210 . Such bonding may be accomplished by using an adhesive, or by mechanically forming a groove on the rear surface of the assembly board 210 to use an adhesive or to be inserted into the groove.

One end of the cable 520 is connected to the connector mounting terminal 430 of the junction panel 210 through the hollow formed inside the duct 510 . Of course, the end of the cable 520 is connected to a PD (Partial Discharge) sensor.

The duct 510 may have a “L” shape in its central cross-section. This duct 510 serves to prevent interference and/or damage to the cable 520 . Cable 520 may be a coaxial cable.

The assembly board 210 is configured to be larger than the thickness of the lower plate 310 in a rectangular shape, and thus is fixed in a form penetrating the lower plate 310 .

100: gas insulated switchgear
110: front panel
120: side panel
200: rear panel
210: assembly group
301: space
310: lower plate
320-1: first plate
320-2: second plate
410: front door
430: connector mounting terminal
431: terminal cap for opening and closing

Claims (1)

In the gas insulated switchgear comprising a front panel 110, a side panel 120 and a rear panel 200,
The assembly panel 210 connected to the partial discharge sensor and the coaxial cable 520 is installed on the lower plate 310 of the rear panel 200,
A space 301 is formed on the inner surface of the lower plate 310 by a first plate 320-1 and a second plate 320-2 disposed at a predetermined interval from the first plate 320-1,
A plurality of connector mounting terminals 430 are installed on the door front 410 of the assembly board 210,
A plurality of the connector mounting terminal 430 is a gas insulated switchgear having a built-in partial discharge assembly panel, characterized in that the coaxial cable connection N-type connector mounting terminal.

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