JP2023081447A - Lightning arrester pull-out device and switchgear - Google Patents

Abstract

To shorten a depth dimension in a switchgear of a lightning arrester pull-out device, and facilitate the connection of a cable for grounding a lightning arrester at an installation site.SOLUTION: The lightning arrester pull-out device includes: a fixed frame provided with a ground bar having a ground wire connection terminal and an input bar having an input wire connection terminal insulated by an insulator; and a movable frame equipped with a lightning arrester, an input contact connected to the line side of the lightning arrester and in contact with the input bar, and a ground contact connected to the ground side of the lightning arrester and in contact with the ground bar, wherein the ground wire connection terminal is arranged to protrude from the fixed frame.SELECTED DRAWING: Figure 2

Description

The present application relates to a lightning arrester extension device and a switchgear using the lightning arrester extension device.

A lightning arrester operates when a surge voltage is applied to the internal circuit of the switchgear, and is provided to protect the internal circuit by sending a current to the ground through a ground wire. During maintenance of the switchgear, the movable frame of the lightning arrester draw-out device is moved within the fixed frame, and the line-side contact and the ground-side contact of the lightning arrester are separated from the input line connection terminal and the ground line connection terminal of the fixed frame, respectively. In this state, the lightning arrester is disconnected from the circuit of the switchgear and becomes a no-voltage state, so maintenance of the lightning arrester can be performed. By mounting the lightning arrester on the movable frame and storing it in the fixed frame in this manner, the lightning arrester can be easily separated from the circuit, and the maintainability of the lightning arrester is improved.
For example, as shown in Patent Document 1, the inside of the switchgear is divided into a plurality of parts by partition plates, in which circuit breakers, lightning arresters, busbars, control circuits, etc. are arranged and connected by electric wires or conductors. A lightning arrestor pull-out device is provided at the portion of the lightning arrestor.

Japanese Patent Application Laid-Open No. 2012-130140 (Fig. 1, paragraph 0017, etc.)

In the lightning arrester draw-out device of Patent Document 1, since the input line connection terminal and the ground line connection terminal of the fixed frame to which the line-side contact and the ground-side contact are connected extend in the depth direction and the bottom direction, the depth dimension of the fixed frame is long. Become. Therefore, there is a problem that the space inside the switch gear is compressed in the depth direction, leading to extension of the switch gear in the depth direction.
In addition, when assembling the switchgear, when connecting the internal circuit of the switchgear and the input line connection terminal of the fixed frame with an electric wire or conductor, the terminal is inside the board, which is the back of the fixed frame, so the worker must not be inside the board. was infiltrating and connecting to However, in the case of a narrow switchgear, there is a problem that it is difficult to get into the switchgear, leading to a decrease in work efficiency of workers.

Furthermore, it is desirable to lower the grounding resistance for the grounding of the lightning arrester in order to increase the protection effect, and it is necessary to separate it from the grounding of other equipment inside the switchgear. Therefore, the ground wire extending from the rear surface of the fixed frame must be extended to a terminal arranged at a position where the ground wire can be easily connected. The terminal is insulated with an insulator, and the arrester grounding cable raised from the pit is connected to this terminal. This connection work is done at the site where the switchgear is installed. Since it is difficult for a worker to enter the inner side of the panel, which is the rear surface of the fixed frame, and connect the lightning arrester grounding cable, such a structure having insulators and terminals is applied. Such a structure has the problem that the cost of the insulator and the terminal increases and the space inside the switchgear is squeezed.

In particular, in DC switchgears that house high-speed DC circuit breakers for electric railway substations, it is necessary to provide an arc space above the circuit breakers, so it is difficult to secure the depth dimension inside the switchgear, resulting in poor workability. was there.

The present application has been made to solve the above-mentioned problems, and provides a lightning arrester drawer that shortens the depth dimension in the switchgear and facilitates connection of the lightning arrester grounding cable at the installation site. The purpose is to provide an apparatus.

A lightning arrester lead-out device according to the present application includes: a fixed frame provided with a grounding bar having a grounding wire connection terminal and an input bar having an input wire connection terminal insulated by an insulator; a lightning arrester; A movable frame mounted with an input contact that contacts a bar and a ground contact that is connected to the ground side of the lightning arrester and contacts the ground bar, and the ground wire connection terminal is arranged to protrude from the fixed frame. It is designed to

According to the present application, since the fixed frame in which the lightning arrester is stored is provided with the ground bar having the ground wire connection terminal and the input bar having the input wire connection terminal, it is possible to suppress the protrusion dimension beyond the fixed frame. In addition, since the grounding wire connection terminal is provided so as to protrude from the fixing frame, it is easy for the operator to connect the lightning arrester grounding cable at the installation site. It can be connected directly to the connection terminal.

FIG. 2 is a side layout diagram of the switchgear according to Embodiment 1; 1 is a perspective view showing a lightning arrester pull-out device according to Embodiment 1; FIG. FIG. 2 is a perspective view showing a pulled-out state of the lightning arrester pull-out device according to Embodiment 1; FIG. 2 is a perspective view showing a fixing frame of the lightning arrester pull-out device according to Embodiment 1; FIG. 2 is a perspective view showing a state in which the lightning arrester draw-out device according to Embodiment 1 is incorporated in a switchgear; FIG. 4 is a cross-sectional view showing a state in which the lightning arrester pull-out device according to Embodiment 1 is incorporated in the switchgear; FIG. 11 is a side layout diagram of a switchgear according to Embodiment 2;

Embodiment 1.
FIG. 1 is a side layout diagram of a switchgear according to Embodiment 1. FIG. The switchgear 200 is a switchboard in which devices are arranged in portions separated by partition plates. In this embodiment, an example of a DC switchgear that accommodates a DC high-speed circuit breaker for an electric railway substation is shown. In FIG. 1, a circuit breaker section 100 containing a DC high-speed circuit breaker is provided, and an arc space section 110 necessary for interrupting a DC current is provided thereon. A disconnector section 120 is also provided for maintenance of the circuit breaker. These devices are controlled by control devices of the control unit 130 . The lightning arrester unit 140 is provided at the lowest stage of the switchboard, and a lightning arrester grounding cable is connected from a pit in the floor. Devices in the board are connected by wires or conductors in the wiring section 150 .

2 to 4 are the lightning arrester pull-out device 30 incorporated in the lightning arrester section 140. FIG. A lightning arrester pull-out device 30 is divided into a movable frame 10 and a fixed frame 20. - 特許庁2 shows a state in which the movable frame 10 is accommodated in the fixed frame 20, FIG. 3 shows a state in which the movable frame 10 is pulled out from the fixed frame 20, and FIG. It is a figure of only the frame 20. FIG. In these figures, a movable frame 10 has a lightning arrester 1, an input contact 12 insulated from the movable frame 10 by an insulator 13 is connected to its line-side terminal 1a, and a ground contact 11 is connected to a ground-side terminal 1b. It is connected. Wheels 14 are provided at the bottom of the movable frame 10, and the movable frame 10 can be pulled out from the fixed frame 20 by pulling the front panel of the movable frame 10 in the H direction.

The fixed frame 20 is provided with a ground bar 21 that is in contact with and connected to the ground contact 11, and has a ground wire connection terminal 21a on a portion protruding from the fixed frame 20 to the side. The fixed frame 20 is provided with an input bar 22 extending in the lateral direction opposite to the ground bar 21 . The input bar 22 is insulated from the fixed frame 20 by an insulator 23, is connected to the input contact 12 by contacting it, and has an input line connection terminal 22a. It is connected.

FIG. 5 is a perspective view showing a state in which lightning arrester pull-out device 30 according to the present embodiment is installed in switchgear 200. As shown in FIG. A lightning arrester grounding cable 21b laid at the installation site rises from a pit at the bottom of the switchgear 200 and is directly connected to a grounding wire connection terminal 21a projecting from the side surface of the lightning arrester pull-out device 30. FIG. In this way, it is possible to easily connect the surge arrester grounding cable 21b at the installation site. In addition, since the input bar 22 has a shape extending in the lateral direction of the fixed frame 20 of the lightning arrester draw-out device 30, the depth dimension of the lightning arrester draw-out device 30 can be shortened. Since the terminal 22a is provided, the connection work with the electric wire or conductor that becomes the input line 22b is facilitated.

FIG. 6 is a sectional view taken along the line AA of the surge arrester pull-out device 30 in FIG. In this figure, a partition plate 160 is provided on the back side of the lightning arrester drawer device 30 to separate it from other parts. This partition plate 160 is a ground metal, and it is necessary to maintain an insulation distance between the input line connection terminal 22a and the input bar 22. FIG. As described above, the input bar 22 has a shape extending in the side direction of the fixing frame 20 of the lightning arrester drawer 30, and the grounding bar 21 also has a shape extending in the side direction of the fixing frame 20. It is possible to shorten the depth dimension of the device 30 .

Embodiment 2.
FIG. 7 is a side view of the switchgear according to the second embodiment. In the switchgear 200, devices are arranged in portions separated by partition plates. The difference from the first embodiment is that the lightning arrester section 140 is provided at the top of the switchboard and arranged so that the lightning arrester grounding cable 21b can be easily connected from the ceiling pit.
The lightning arrester pull-out device 30 described in the first embodiment can achieve the same effect as the first embodiment even if the arrangement of the lightning arrester section 140 is changed.
It should be noted that the lightning arrester pull-out device 30 can be used even if the lightning arrester section 140 is not placed at the top or bottom of the switchgear 200, and the depth dimension of the lightning arrester pull-out device 30 can be shortened. .

While this application describes various exemplary embodiments and examples, various features, aspects, and functions described in one or more embodiments may not apply to particular embodiments. can be applied to the embodiments singly or in various combinations. Accordingly, numerous variations not illustrated are envisioned within the scope of the technology disclosed herein. For example, modification, addition or omission of at least one component, extraction of at least one component, and combination with components of other embodiments shall be included.

1 lightning arrester 10 movable frame 11 grounding contact 12 input contact 13 insulator 14 wheel 20 fixed frame 21 grounding bar 21a grounding wire connection terminal 21b lightning arrester grounding cable 22 input bar 22a input wire connection terminal , 22b input line, 23 insulator, 30 lightning arrester pull-out device, 100 breaker section, 110 arc space section, 120 disconnector section, 130 control section, 140 lightning arrestor section, 150 wiring section, 160 partition plate.

Claims (9)

a fixed frame provided with a ground bar having a ground wire connection terminal and an input bar having an input wire connection terminal insulated by an insulator;
a movable frame mounted with a lightning arrester, an input contact connected to the line side of the lightning arrester and in contact with the input bar, and a ground contact connected to the ground side of the lightning arrester and in contact with the ground bar;
A pull-out device for a lightning arrester, wherein the ground wire connection terminal is arranged to protrude from the fixed frame. 2. The lightning arrester draw-out device according to claim 1, wherein said ground wire connecting terminal is arranged to protrude from a side surface of said fixed frame. 3. The lightning arrester pull-out device according to claim 1, wherein the input bar of the fixed frame is provided extending in a side direction opposite to the ground wire connection terminal. 4. The lightning arrester drawer according to any one of claims 1 to 3, wherein the grounding bar of the fixed frame is provided extending in a side surface direction opposite to the input line connection terminal. Device. wherein, when the movable frame is pushed into the fixed frame, the input contact is contacted and connected to the input bar, and the ground contact is contacted and connected to the ground bar; A lightning arrester pull-out device according to any one of claims 1 to 4. The input contact is separated from the input bar and the ground contact is separated from the ground bar when the movable frame is pulled out from the fixed frame. A lightning arrester withdrawal device according to any one of claims 1 to 5. A switchgear comprising the lightning arrester pull-out device according to any one of claims 1 to 6. A switchgear, wherein the lightning arrester pull-out device according to any one of claims 1 to 6 is provided at the lowest stage of a switchboard. 7. A switchgear, wherein the lightning arrester lead-out device according to any one of claims 1 to 6 is provided on the uppermost stage of a switchboard.

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