JP7702860B2 - Lightning arrester pull-out device and switchgear - Google Patents

Description

This application relates to a lightning arrester pull-out device and a switchgear using the lightning arrester pull-out device.

The 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 passing the current to the ground through the ground wire. During maintenance of the switchgear, the movable frame of the lightning arrester pull-out device is moved within the fixed frame, and the line side contact and ground side contact of the lightning arrester are disconnected from the input line connection terminal and ground wire connection terminal of the fixed frame, respectively. In this state, the lightning arrester is disconnected from the switchgear circuit and is in a voltage-free state, making it possible to perform maintenance on the lightning arrester. By mounting the lightning arrester on the movable frame and storing it within the fixed frame in this way, it becomes easy to pull the lightning arrester out from the circuit, improving the maintainability of the lightning arrester.
For example, as shown in Patent Document 1, the inside of the switchgear is divided into a plurality of sections by partition plates, in which circuit breakers, lightning arresters, busbars, control circuits, etc. are arranged and connected by electric wires or conductors. A lightning arrester pull-out device is provided at the lightning arrester section.

JP 2012-130140 A (FIG. 1, paragraph 0017, etc.)

In the lightning arrester pull-out device of Patent Document 1, 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 downward direction, which increases the depth dimension of the fixed frame. This causes a problem in that it puts pressure on the space inside the switchgear in the depth direction, leading to an extension of the switchgear in the depth direction.
In addition, when assembling the switchgear, to connect 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 located on the inside of the panel behind the fixed frame, so the worker has to enter the panel to make the connection. However, with small and narrow switchgear, it is difficult to enter the panel, which causes a problem of reduced work efficiency.

Furthermore, in order to increase the protective effect of the grounding of the lightning arrester, it is desirable to lower the grounding resistance, and it is necessary to separate the grounding from that of other equipment inside the switchgear. For this reason, the grounding wire extending from the back of the fixed frame needs to be extended to a terminal located in a position that makes it easy to connect the grounding wire. The terminal is insulated with an insulator, and the lightning arrester grounding cable that rises from the pit is connected to this terminal. This connection work is done on site where the switchgear is installed. Since it is difficult for workers to reach the inside of the panel, which is the back of the fixed frame, and connect the lightning arrester grounding cable, a structure with such insulators and terminals is applied. However, there are problems with using such a structure, such as increased costs due to the insulators and terminals and reduced space inside the switchgear.

In particular, DC switchgear housing DC high-speed circuit breakers for railway substations requires an arc space to be provided above the circuit breaker, which makes it difficult to obtain the proper depth within the switchgear and reduces workability.

This application has been made to solve the problems described above, and aims to provide a lightning arrester pull-out device that shortens the depth dimension within the switchgear and makes it easy to connect the lightning arrester grounding cable at the installation site.

The lightning arrester extraction device of the present application comprises a fixed frame having a ground bar having a ground wire connection terminal and an input bar having an input line connection terminal insulated by an insulator, and a movable frame carrying 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 side of the fixed frame , and the input bar of the fixed frame is extended in the direction of the side opposite the ground wire connection terminal .

According to the present application, a ground bar having a ground wire connection terminal and an input bar having an input line connection terminal are provided in the fixed frame in which the lightning arrester is stored, so that the dimension of the lightning arrester protruding into the rear of the fixed frame can be reduced. In addition, since the ground wire connection terminal is provided protruding from the fixed frame, it is easy for workers to connect the lightning arrester grounding cable at the installation site, and the lightning arrester grounding cable can be directly connected to the ground wire connection terminal provided in the fixed frame.

FIG. 2 is a side layout diagram of the switchgear according to the first embodiment. FIG. 1 is a perspective view showing a lightning arrester extraction device according to a first embodiment. FIG. 2 is a perspective view showing a pulled-out state of the lightning arrester pull-out device according to the first embodiment. FIG. 2 is a perspective view showing a fixing frame of the lightning arrester pull-out device according to the first embodiment. FIG. 2 is a perspective view showing a state in which the lightning arrester pull-out device according to the first embodiment is incorporated into a switch gear. 1 is a cross-sectional view showing a state in which a lightning arrester pull-out device according to a first embodiment is incorporated into a switch gear. FIG. FIG. 11 is a side layout diagram of a switchgear according to a second embodiment.

Embodiment 1.
FIG. 1 is a side layout diagram of a switchgear according to a first embodiment. The switchgear 200 is a distribution board in which each device is arranged in a section separated by a partition plate. In this embodiment, an example of a DC switchgear that houses a DC high-speed circuit breaker for a railway substation is shown. In FIG. 1, a circuit breaker section 100 that houses the DC high-speed circuit breaker is provided, and an arc space section 110 required for interrupting a DC current is provided thereon. In addition, a disconnector section 120 for maintaining the circuit breaker is provided. These devices are controlled by a control device of a control section 130. The lightning arrester section 140 is provided at the bottom of the distribution board, and a lightning arrester grounding cable is connected from a pit in the floor. Each device in the board is connected by an electric wire or conductor in a wiring section 150.

2 to 4 show the arrester pull-out device 30 incorporated in the arrester section 140. The arrester pull-out device 30 is divided into a movable frame 10 and a fixed frame 20. FIG. 2 shows the movable frame 10 stored in the fixed frame 20, FIG. 3 shows the movable frame 10 pulled out from the fixed frame 20, and FIG. 4 shows only the fixed frame 20 with the movable frame 10 pulled out from the fixed frame 20. In these figures, the movable frame 10 has a lightning arrester 1, and the input contact 12 insulated from the movable frame 10 by the insulator 13 is connected to the line side terminal 1a, and the ground contact 11 is connected to the ground side terminal 1b. There are wheels 14 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 contacts and connects to the ground contact 11, and has a ground line connection terminal 21a on the part that protrudes to the side from the fixed frame 20. The fixed frame 20 is provided with an input bar 22 that extends in the direction of the side opposite the ground bar 21. The input bar 22 is provided insulated from the fixed frame 20 by an insulator 23, contacts and connects to the input contact 12, has an input line connection terminal 22a, and is connected to an electric wire or conductor on the line side within the switch gear 200.

Figure 5 is a perspective view showing the state in which the arrester pull-out device 30 according to this embodiment is installed in the switch gear 200. The arrester grounding cable 21b laid at the installation site rises from a pit at the bottom of the switch gear 200 and is directly connected to the grounding wire connection terminal 21a protruding from the side of the arrester pull-out device 30. In this way, the arrester grounding cable 21b can be easily connected at the installation site. In addition, since the input bar 22 extends in the lateral direction of the fixed frame 20 of the arrester pull-out device 30, the depth dimension of the arrester pull-out device 30 can be shortened, and since the input line connection terminal 22a is provided on the upper surface of the fixed frame 20, the connection work with the electric wire or conductor that becomes the input line 22b is easy.

Figure 6 is an AA cross-sectional view of the arrester pull-out device 30 in Figure 5. In this figure, a partition plate 160 is provided on the rear side of the panel of the arrester pull-out device 30 to separate it from other parts. This partition plate 160 is made of grounded metal, and it is necessary to maintain an insulating distance between the input line connection terminal 22a and the input bar 22. As described above, the input bar 22 extends in the lateral direction of the fixed frame 20 of the arrester pull-out device 30, and the ground bar 21 also extends in the lateral direction of the fixed frame 20, so that the depth dimension of the arrester pull-out device 30 can be shortened.

Embodiment 2.
7 is a side layout diagram of a switchgear according to embodiment 2. In switchgear 200, each device is arranged in a section separated by a partition plate. The difference from embodiment 1 is that the lightning arrester section 140 is provided on the top stage of the switchboard, and is arranged so that the lightning arrester grounding cable 21b can be easily connected from a pit in the ceiling.
The arrester pull-out device 30 described in the first embodiment can achieve the same effects as those of the first embodiment even if the arrangement of the arrester section 140 is changed.
Incidentally, the lightning arrester pull-out device 30 can be used even if the lightning arrester section 140 in the switchgear 200 is not arranged in the top or bottom row, and the depth dimension of the lightning arrester pull-out device 30 can be shortened.

Although various exemplary embodiments and examples are described in this application, the various features, aspects, and functions described in one or more embodiments are not limited to the application of a particular embodiment, but may be applied to the embodiments alone or in various combinations. Thus, countless variations not illustrated are anticipated within the scope of the technology disclosed in this specification. For example, this includes cases in which at least one component is modified, added, or omitted, and even cases in which at least one component is extracted and combined with components of other embodiments.

1 Lightning arrester, 10 Movable frame, 11 Ground contact, 12 Input contact, 13 Insulator, 14 Wheel, 20 Fixed frame, 21 Ground bar, 21a Ground wire connection terminal, 21b Lightning arrester grounding cable, 22 Input bar, 22a Input wire connection terminal, 22b Input wire, 23 Insulator, 30 Lightning arrester pull-out device, 100 Circuit breaker section, 110 Arc space section, 120 Disconnector section, 130 Control section, 140 Lightning arrester section, 150 Wiring section, 160 Partition plate.

Claims (7)

a fixed frame provided with a ground bar having a ground wire connection terminal and an input bar having an input line connection terminal insulated by an insulator;
a movable frame carrying a lightning arrester, an input contact connected to a line side of the lightning arrester and in contact with the input bar, and a ground contact connected to a ground side of the lightning arrester and in contact with the ground bar;
The ground wire connection terminal is disposed so as to protrude from a side surface of the fixing frame,
The lightning arrester pull-out device according to claim 1, wherein the input bar of the fixed frame is provided extending in a lateral direction opposite to the ground wire connection terminal . 2. The lightning arrester pull-out device according to claim 1 , wherein the ground bar of the fixing frame is provided so as to extend in a direction opposite to the input line connection terminal. 3. The lightning arrester extraction device according to claim 1, wherein when the movable frame is pressed into the fixed frame, the input contact is in contact with and connected to the input bar, and the ground contact is in contact with and connected to the ground bar. 4. The lightning arrester extraction device according to claim 1, wherein when the movable frame is extracted from the fixed frame, the input contact is disconnected from the input bar and the ground contact is disconnected from the ground bar . A switchgear comprising the lightning arrester pull-out device according to any one of claims 1 to 4 . A switchgear, comprising: the lightning arrester pull-out device according to any one of claims 1 to 4 ; and the lightning arrester pull-out device is provided at the lowest stage of a switchboard. A switchgear, comprising: the lightning arrester pull-out device according to any one of claims 1 to 4 , provided at an uppermost stage of a switchboard.

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