JP7270925B2 - Arrestor installation structure - Google Patents

Description

Application of Article 30, Paragraph 2 of the Patent Act Exception to lack of novelty 1 On May 22, 2019, in the pamphlet of "Distribution Board with Kantouch SPD" distributed by Panasonic Corporation at the 67th Electrical Construction Industry Exhibition at Tokyo Big Sight, It was published as "Mounting Structure of Lightning Arrestor".

Application of Article 30, Paragraph 2 of the Patent Act Exception to lack of novelty 2 On May 22, 2019, in the Panasonic Corporation "Distribution Board with Kantouch SPD" pamphlet distributed at the 67th Electrical Construction Industry Exhibition at Tokyo Big Sight, It was published as "Mounting Structure of Lightning Arrestor".

Application of Article 30, Paragraph 2 of the Patent Law Exception to loss of novelty 3 ” was released.

Application of Article 30, Paragraph 2 of the Patent Law Exception to lack of novelty 4 ” was released.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightning arrester mounting structure for assembling a lightning arrester to a distribution board and connecting a line-side terminal of the lightning arrester to a power line of the distribution board.

For example, for the purpose of preventing lightning damage due to direct lightning strikes and induced lightning strikes, lightning arresters are devices that protect electrical equipment by limiting surge voltages, which are transient overvoltages caused by lightning strikes, and shunting surge currents.

One of this type of lightning arresters is an SPD (Surge Protective Device) composed of a lightning protection element such as a zinc oxide varistor.

For example, in power consumers such as factories and general households, a power line is drawn from a single-phase or three-phase AC electric circuit, and a distribution board connected to the power line is installed.

A lightning arrester is attached to a distribution board of an electric power consumer by connecting a line-side terminal of the lightning arrester to a power line of the distribution board.

2. Description of the Related Art In a lightning arrester, for example, when a short-circuit failure occurs due to characteristic deterioration of a lightning arrester element, it is necessary to quickly disconnect the faulty lightning arrester from the power supply line, and inspect and replace the lightning arrester.

Therefore, the present applicant has previously proposed a power line connection device having a function of separating the lightning arrester from the power line of the distribution board (see, for example, Patent Document 1).

The power line connection device disclosed in Patent Document 1 has a disconnector provided with a lever for connecting and disconnecting the lightning arrester to the power line, and is a lightning arrester with a disconnector in which the lightning arrester is detachably attached to the disconnector. is.

Japanese Patent No. 6245673

By the way, when assembling the power supply line connection device of Patent Document 1, that is, a lightning arrester with a disconnector, to a power consumer's distribution board, the line-side terminal of the lightning arrester provided in the disconnector is connected to the power supply line of the distribution board. wiring is required.

In this way, it is necessary to carry out wiring work for connecting the line-side terminal of the lightning arrester and the power supply line of the distribution board, such as wiring and screw tightening. Therefore, it was difficult to reduce the number of man-hours and shorten the work time because it took time and effort to install the lightning arrester on the distribution board.

In addition, since wiring is required to connect the line-side terminal of the lightning arrester to the power supply line of the distribution board, there is a risk of wiring errors by workers. It was difficult to improve

Accordingly, the present invention has been proposed in view of the above-mentioned problems, and its object is to reduce man-hours, shorten work time, and improve reliability in installing lightning arresters on distribution boards. To provide a mounting structure for a lightning arrester to obtain.

The present invention is a mounting structure for a lightning arrester in which a lightning arrester is assembled to a distribution board and a line-side terminal of the lightning arrester is connected to a power supply line of the distribution board.

As a technical means for achieving the above object, the present invention has a terminal block arranged on the side surface of the lightning arrester, and the line-side terminal of the lightning arrester and the power line of the distribution board are connected via the terminal block. characterized by

By using the terminal block attached to the side surface of the lightning arrester in this manner, wiring for connecting the line-side terminals of the lightning arrester and the power supply line of the distribution board becomes unnecessary.

The lightning arrester of the present invention has a structure in which a disconnector is attached to connect and disconnect the lightning arrester to and from the power supply line of the distribution board, and a terminal block is arranged on the side of the disconnector on which the line-side terminals of the lightning arrestor are arranged. desirable.

By adopting such a structure, wiring for connecting the line-side terminal of the lightning arrester provided in the disconnecting switch and the power supply line of the distribution board becomes unnecessary. Thus, the present invention can also be applied to lightning arresters with disconnecting switches.

In the present invention, the line-side terminal of the lightning arrester is a screw-shaped metal fitting, the lightning arrester-side terminal of the terminal block is a concave metal fitting, and the line-side terminal and the lightning arrester-side terminal are connected by fitting the concave metal fitting into the screw-shaped metal fitting. Structure is preferred.

By adopting such a structure, the line-side terminals of the arrester and the arrester-side terminals of the terminal block can be connected by a simple means without wiring.

In the present invention, the terminals on the distribution board side of the terminal block are blade receiving metal fittings, the power lines of the distribution board are band plate metal fittings, and the distribution board side terminals are connected by inserting the band plate metal fittings into the blade receiving metal fittings. A structure in which the terminal and the power line are connected is desirable.

By adopting such a structure, the terminals on the distribution board side of the terminal block and the power lines of the distribution board can be connected by a simple means without wiring.

According to the present invention, the use of the terminal block attached to the side surface of the lightning arrester eliminates the need for wiring for connecting the line-side terminals of the lightning arrester and the power line of the distribution board.

This eliminates the need for wiring work such as wiring and screw tightening, so that the number of man-hours and work time can be reduced in installing the lightning arrester to the distribution board. In addition, since wiring mistakes by workers are eliminated, reliability can be improved in the installation work of lightning arresters to distribution boards.

FIG. 4 is a perspective view showing a state before attaching a terminal block to a lightning arrester in an embodiment of the present invention; FIG. 4 is a perspective view showing a state after the terminal block is attached to the lightning arrester according to the embodiment of the present invention; FIG. 4 is a perspective view of the terminal block viewed from the lightning arrester side in the embodiment of the present invention; 1 is a perspective view of a terminal block viewed from a power line side in an embodiment of the present invention; FIG. FIG. 2 is a perspective view of the lightning arrester in the embodiment of the present invention before being assembled to the distribution board, viewed from the power line side; 1 is a perspective view of a lightning arrester before being assembled to a distribution board in an embodiment of the present invention, viewed from the lightning arrester side; FIG. FIG. 4 is a perspective view of a state after the lightning arrester is mounted on the distribution board in the embodiment of the present invention, viewed from the power line side. FIG. 2 is a perspective view of a lightning arrester after being mounted on a distribution board in the embodiment of the present invention, as seen from the lightning arrester side;

An embodiment of a lightning arrester mounting structure according to the present invention will be described in detail below with reference to the drawings.

In the following embodiments, the case of application to a single-phase three-wire AC circuit and a three-phase three-wire AC circuit will be exemplified, but it can also be applied to other AC circuits such as a single-phase two-wire AC circuit. .

Further, in the following embodiments, the power supply line connection device (see Patent Document 1) previously proposed by the present applicant, that is, a lightning arrester with a disconnecting switch integrated with a lightning arrester provided with a disconnecting switch will be exemplified. It can also be applied only to lightning arresters that are not equipped with devices.

The lightning arrester 11 with a disconnecting switch has a size of agreement, and as shown in FIGS. 1 shows the state before the terminal block 13 is attached to the lightning arrester 11, and FIG. 2 shows the state after the terminal block 13 is attached to the lightning arrester 11. FIG.

The lightning arrester 11 of this embodiment is a lightning protection element mainly composed of zinc oxide (ZnO) having non-linear current-voltage characteristics showing low resistance against surge voltages and high resistance against normal power supply voltages. It has a structure in which a (metal oxide varistor) is housed inside a resin housing 14 .

The disconnecting switch 12 has a structure in which a lever 16 for connecting/disconnecting the lightning arrester 11 to/from the power line 33 (see FIGS. 5 and 7) of the distribution board 28 is provided on the top surface of the resin housing 15 . A line-side terminal 17 of the lightning arrester 11 is arranged on the side surface of the disconnector 12 . The line-side terminal 17 has a screw-clamping structure including a screw-like metal fitting 18 .

In this embodiment, since it is a three-wire AC circuit, three track-side terminals 17 are exemplified. The number of 17 is arbitrary.

In the lightning arrester 11 with a disconnector, for example, in the event of a short-circuit failure due to characteristic deterioration of the lightning protection element, the faulty lightning arrester 11 can be removed in a state of being electrically disconnected from the disconnector 12 by operating the lever 16 of the disconnector 12 . , the lightning arrester 11 is inspected and replaced.

In the lightning arrester 11 with a disconnector, the terminal block 13 for connecting the line-side terminal 17 of the lightning arrester 11 provided in the disconnector 12 and the power line 33 (see FIGS. 5 and 7) of the distribution board 28 is the disconnector. It is arranged on 12 sides.

The terminal block 13 includes lightning arrester-side terminals 21 (see FIG. 3) consisting of concave metal fittings 20 protruding from one side of a resin housing 19, and blade holders arranged in slits 22 on the other side of the housing 19. It has a distribution board side terminal 24 (see FIG. 4) consisting of a shaped metal fitting 23 .

The recessed metal fitting 20 of the lightning arrester-side terminal 21 and the blade receiving metal fitting 23 of the distribution board-side terminal 24 are electrically connected inside the housing 19 .

The blade receiving metal fittings 23 of the distribution board side terminals 24 are inserted into one slit 22 at different vertical positions for the three terminal blocks 13 among the three slits 22 arranged in the vertical direction on the side surface of the housing 19. is provided.

In this embodiment, three terminal blocks 13 are attached corresponding to the number of line-side terminals 17 of the lightning arrester 11 . By making the line-side terminals 17 and the terminal blocks 13 correspond to each other on a one-to-one basis, it is possible to easily cope with a change in the number of line-side terminals that accompanies a change in the type of lightning arrester 11 . Note that the plurality of terminal blocks 13 may be integrated.

By fitting the recessed metal fitting 20 of the terminal block 13 into the threaded metal fitting 18 of the disconnecting switch 12, the line-side terminal 17 of the arrester 11 and the arrester-side terminal 21 of the terminal block 13 are electrically connected. Moreover, the terminal block 13 is attached and fixed to the side surface of the disconnector 12 by the screw-fastening structure of the concave metal fitting 20 by the screw metal fitting 18 .

A protective cover 27 is attached so as to cover the upper surface opening 25 of the line-side terminal 17 of the lightning arrester 11 and the upper concave stepped portion 26 of the terminal block 13 . The protective cover 27 can be fixed to the disconnecting switch 12 and the terminal block 13 with an adhesive or the like.

As shown in FIGS. 5 and 6, the distribution board 28 to which the lightning arrester 11 with the disconnecting switch and the terminal block 13 configured as described above are assembled has cut-and-raised structures for fixing the disconnecting switch 12 and the lightning arrester 11, as shown in FIGS. A hooking claw 29 and an elastically deformable pressing piece 30 are provided.

5 and 6 show only a portion of the distribution board 28, that is, a portion for attaching the lightning arrester with disconnecting switch 11, and other portions are omitted.

In the distribution board 28 , the hooking claws 29 are provided along one side surface of the lightning arrester 11 and the disconnecting switch 12 at a plurality of locations on a straight line. The pressing pieces 30 are provided at a plurality of locations along a straight line along the other side surfaces of the lightning arrester 11 and the disconnector 12 .

On the other hand, a concave portion 31 with which the hooking claw 29 is engaged is provided in the lower part of one side of the lightning arrester 11 and the disconnecting switch 12 . A recess 32 into which the pressing piece 30 is fitted is provided on the lower side of the other of the lightning arrester 11 and the disconnector 12 .

The power line 33 is attached to a frame 34 erected on the distribution board 28 . The power line 33 is composed of a strip-shaped metal fitting 35 extending horizontally from the frame 34 along the side surfaces of the lightning arrester 11 and the disconnecting switch 12 . Three strip-shaped metal fittings 35 are arranged in the vertical direction so as to correspond to the slits 22 of the terminal block 13 .

The lightning arrester with disconnecting switch 11 and the terminal block 13 are assembled to the distribution board 28 configured as described above in the following manner.

As shown in FIGS. 5 and 6 , the lightning arrester 11 and the disconnecting switch 12 are assembled to the distribution board 28 using the hooking claw 29 and the pressing piece 30 of the distribution board 28 .

That is, the hooking claw 29 of the distribution board 28 is engaged with the concave portion 31 on one side surface of the lightning arrester 11 and the disconnecting switch 12, and the lightning arrester 11 and the disconnecting switch 12 are moved while elastically deforming the pressing piece 30 of the distribution board 28. is fitted into the recess 32 on the other side of the . In this way, lightning arrester 11 and disconnecting switch 12 are fixed to distribution board 28 .

On the other hand, by inserting and contacting the strip metal fitting 35 of the power supply wire 33 into the blade receiving metal fitting 23 in the slit 22 of the terminal block 13, the distribution board side terminal 24 of the terminal block 13 and the distribution board 28 are connected. It is electrically connected to the power line 33 (see FIGS. 7 and 8).

As a result, the line-side terminal 17 of the lightning arrester 11 and the power line 33 of the distribution board 28 are electrically connected via the terminal block 13 . By using the terminal block 13 attached to the side surface of the disconnecting switch 12 in this manner, wiring for connecting the line-side terminal 17 of the lightning arrester 11 and the power supply line 33 of the distribution board 28 becomes unnecessary.

As a result, there is no wiring work such as wiring or screw tightening, so that the number of man-hours and work time for installing the lightning arrester 11 to the distribution board 28 can be reduced. In addition, since wiring mistakes by workers are eliminated, reliability can be improved in the installation work of the lightning arrester 11 to the distribution board 28 .

The present invention is by no means limited to the above-described embodiments, and can of course be embodied in various forms without departing from the gist of the present invention. It is defined by the claims, and includes all changes within the meaning of equivalents and the scope of the claims.

11 lightning arrestor 12 disconnector 13 terminal block 17 track side terminal 18 screw metal fitting 20 recessed metal fitting 21 lightning arrestor side terminal 23 blade receiving metal fitting 24 distribution board side terminal 28 distribution board 33 power supply line 35 strip metal fitting

Claims (3)

A lightning arrester mounting structure for assembling a lightning arrester to a distribution board and connecting a line-side terminal of the lightning arrester to a power supply line of the distribution board,
disposing a terminal block on the side surface of the lightning arrester, connecting the line-side terminal of the lightning arrester and the power supply line of the distribution board via the terminal block ,
The line-side terminal of the lightning arrester is a screw-shaped metal fitting, and the lightning arrester-side terminal of the terminal block is a concave metal fitting, and the line-side terminal and the lightning arrester-side terminal are connected by fitting the concave metal fitting into the screw-shaped metal fitting. A lightning arrester mounting structure, characterized in that The lightning arrester is provided with a disconnector for connecting and disconnecting the lightning arrester to and from the power supply line of the distribution board, and the terminal block is arranged on a side surface of the disconnector on which the line-side terminals of the lightning arrestor are arranged. Item 1. A lightning arrester mounting structure according to Item 1. The distribution board-side terminal of the terminal block is a blade receiving metal fitting, the power line of the distribution board is a band plate-shaped metal fitting, and the distribution board is connected by inserting the band plate-shaped metal fitting into the blade receiving metal fitting. 3. The lightning arrester mounting structure according to claim 1, wherein the side terminal and the power line are connected.

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