JPH079352Y2 - Lightning arrester mounting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a lightning arrester mounting device for protecting various devices of a main circuit from lightning and other shocking overvoltage applied to the main circuit.

[Conventional technology]

Conventionally, a lightning arrester in a gas-insulated switchgear has a characteristic element housed inside an insulating cylinder housed in a metal container, and a branch conductor branched from a main circuit is hermetically introduced into the container. The conductor is airtightly drawn from the insulating cylinder to be connected to the branch conductor, and the conductor at the other end of the characteristic element is airtightly drawn from the insulating cylinder to be grounded.

However, in this case, SF ₆ is placed inside the insulating cylinder and inside the container.
Since it is necessary to enclose insulating gas such as gas, gas treatment is required at the time of installing or replacing the lightning arrester, and also at each DC withstanding voltage test, resulting in poor workability and extremely poor handleability.

Therefore, the present applicant proposes a plug-in type arrester in which the characteristic element is integrally molded with an insulating material in order to solve the above-mentioned drawbacks.

FIG. 4 shows a gas-insulated switchgear using this type of arrester.

In the figure, 1 is a base of a gas insulated switchgear, 2 is installed on the base 1 via a frame-shaped stand 3, and SF ₆ is installed inside.
An airtight container 4 in which an insulating gas such as gas is sealed is a circuit breaker, and is composed of a circuit breaker 5 and an operating device 6. The power supply side terminal and the load side terminal of the circuit breaker 5 are introduced into the container 2 in an airtight manner. Has been done.

Reference numeral 7 denotes a slip-on type power receiving bushing that is airtightly provided on the upper wall of the container 2, and a slip-on type power feeding connector 9 at the end of the power cable 8 is connected to the bushing 7.

Reference numeral 10 is a main circuit conductor that is provided through the bushing 7, and is connected to the power source side terminal of the breaking unit 5 via a disconnector 11 housed in the container 2 and loads via the opening / closing unit 12 of the breaking unit 5. The side terminals are connected to a bus bar 13 which is hermetically introduced into the container 2 to form a main circuit.

Reference numeral 14 denotes a slip-on type branch bushing which is hermetically provided on the upper wall of the container 2, and a branch conductor 15 branched from the main circuit conductor 10 of the power receiving bushing 7 is provided inside the container 2.

Reference numeral 16 denotes a plug-in type lightning arrester that is detachably connected to the branch bushing 14, and a characteristic element 17 such as a ZnO element is molded with an insulating material to form a premolded insulator connector. 18 is a connection conductor connected to one end of the characteristic element 17 and connected to the branch conductor 15 so as to be freely separated and contacted, and 19 is a characteristic element
It is a grounding terminal connected to the other end of 17 and grounded.

Then, by fitting and connecting this lightning arrester 16 to the branch bushing 14, the connection conductor 18 is connected to the branch conductor 15, and the lightning arrester 16 is installed, and when lightning or other shock-induced overvoltage occurs in the main circuit, A large current is sent to the ground by the action of the characteristic element 17, and the equipment connected to the main circuit is protected.

Here, the lightning arrester 16 has the same structure as the slip-on type cable connector, so that it is extremely easy to install and remove, and the gas treatment like the one described above is completely unnecessary, and the handleability is remarkably improved. improves.

[Problems to be solved by the invention]

In the case of the one shown in FIG. 4, in order to install the lightning arrester 16,
It is necessary to attach the branch bushing 14 to the container 2.

Therefore, the branch bushing 14 itself is required for three phases, and the branch conductor 15 for branching from the main circuit conductor 10 is also three.
There is a drawback that the phase is required, the number of parts used is large, the structure is complicated, and the container 2 is large.

Furthermore, not only does the container 2 need a mounting space for the branch bushings 14 for three phases, but it is necessary to machine the mounting holes for each branch bushing 14 in the container 2, and moreover, an airtight structure for each branch bushing 14 is required. It is necessary, the workability of attaching the branch bushing 14 is poor, and it is expensive.

The present invention has been made in view of the above points, and an object thereof is to provide a lightning arrester mounting device which does not require a branch bushing, has a small number of parts, has a simple structure, and has a small container.

[Means for solving problems]

In order to solve the above problems, a lightning arrester mounting device of the present invention is a slip-on type power receiving bushing that is hermetically provided in a hermetically sealed container, a main circuit conductor that is provided in the bushing, and the main circuit conductor. A fitting terminal fixed to the tip located outside the container, a slip-on type power supply connector molded and detachably connected to the bushing outside the container, and embedded in the connector. A power supply conductor connected to a power supply cable in a direction orthogonal to the direction of the circuit conductor; and a first fitting terminal connected to the power supply conductor and detachably fitted to a fitting terminal of the main circuit conductor, A second fitting terminal connected to the power supply conductor; a slip-on type lightning arrester molded with a characteristic element and detachably connected to the connector; A second mating fitting terminal which is separable freely fitted to the terminals of the body, which is connected to the other end of the characteristic element, in which a derived ground terminal.

[Action]

In the lightning arrester mounting device of the present invention configured as described above, the slip-on type power receiving bushing is airtightly provided in the airtight container, and the slip-on type power feeding connector molded in the bushing is detachably connected. , A power supply conductor connected to a power cable in a direction orthogonal to the direction of the main circuit conductor penetrating the bushing is embedded in the connector, and a slip-on type arrester molded with characteristic elements is detachably attached to the connector. Since the grounding terminal is connected to the surge arrester, the main circuit conductor is connected by connecting the slip-on type power supply connector to the slip-on type power receiving bushing and connecting the slip-on type arrester to the connector. A power cable is connected to, and the characteristic element is branched and connected to the main circuit.

Therefore, it is not necessary to provide a branch bushing as in the related art, the space is not required, the number of parts is small, the structure is simple, and the sealed container is small.

In addition, the airtight container does not need to have the attachment hole for the branch bushing and the airtight structure as in the conventional case, and the attachment work becomes easy.

〔Example〕

An embodiment will be described with reference to FIGS. 1 to 3. In these figures, the same symbols as those in FIG. 4 indicate the same or corresponding ones.

First, FIGS. 1 and 2 showing the first embodiment will be described.

Reference numeral 20 is a slip-on type power supply connector removably connected to a power receiving bushing 7 which is vertically and airtightly provided on the upper wall of the hermetically sealed container 2, and 21 is a premolded insulator made of rubber molding material. It is a character-shaped connector body,
It has first, second and third ends. Reference numeral 22 denotes a power supply conductor embedded in the main body 21, to which the power cable 8 in a direction orthogonal to the direction of the main circuit conductor 10 is connected from the first end of the middle portion of the main body 21.

Reference numeral 23 denotes a male fitting terminal fixed to the tip of the main circuit conductor 10 located outside the container 2, that is, the upper end, and 24 denotes a male first fitting located at the lower second end of the main body 21. It is a terminal and is connected to the power feeding conductor 22, and when the connector 20 is detachably connected to the bushing 7, the first fitting terminal 24 is fitted to the fitting terminal 23 of the main circuit conductor 10 so as to be detachable.

Numeral 25 is a second shaped stalk located at the third end of the top of the body 21
It is a fitting terminal and is connected to the power supply conductor 22.

26 is a slip-on type lightning arrester removably connected to the third end of the body 21 of the connector 20, 27 is a characteristic element such as a ZnO element, 28 is a lightning arrester body made of an insulating material in which the characteristic element 27 is molded, 29 is a male fitting terminal located at the lower end of the lightning arrester main body 28 and connected to one end of the characteristic element 27, and is fitted to the second fitting terminal 25 of the connector 20 so as to be freely contactable and separable. 30
Is a grounding terminal connected to the other end of the characteristic element 27 and is led out from the side portion of the arrester body 28.

The outer surface of each of the power supply connector 20 and the electric arrester 26 is a ground layer.

Therefore, by connecting the power feeding connector 20 to the power receiving bushing 7 penetrating the container 2, the power feeding conductor 22 is connected to the main circuit conductor 10, and by connecting the lightning arrester 28 to this connector 20, the characteristic element 27 is formed. Is connected to the power supply conductor 22, and the installation of the arrester 26 is completed.

As a result, only the power receiving bushing 7 having the main circuit conductor 10 penetrating is attached to the container 2, and the conventional branch bushing for the lightning arrester 26 is unnecessary.

Next, FIG. 3 showing the second embodiment will be described.

As shown in the figure, the lightning arrester 26 is attached to the power supply connector 20 from the lateral direction, and the power cable 8 is connected to the connector 20.
It is designed to be detachably connected and connectable.

That is, a slip-on type male connecting portion is formed at the right end portion (first end portion) of the T-shaped connector body 21 of the power feeding connector 20, and the slip-on portion provided at the end portion of the power cable 8 is formed on this. Type cable connector 31 is detachably connected, and the male fitting terminal 32 of the end of the power cable 8 is
It is fitted in a female-shaped fitting terminal 33 of the power supply conductor 22 of the connector 20 so as to be freely contactable and separable.

Further, a slip-on type female-shaped connecting portion is formed in the lower middle part (second end portion) of the connector body 21, and the connecting portion is detachably connected to the power receiving bushing 7 to connect the power feeding conductor 22 and the main circuit conductor 10. Are connected so that they can be connected and disconnected freely.

Further, a slip-on type female connecting portion is formed on the left end portion (third end portion) of the connector main body 21, and the arrester 26 is detachably connected thereto, and one end of the characteristic element 27 is fitted with a female shape. The attachment terminal 29 is attached to the male-shaped second attachment terminal 25 of the power feeding conductor 16 so as to be freely contactable and separable.

Therefore, as in the case of the first embodiment, the power receiving connector 20 to which the power cable 8 is connected is connected to the power receiving bushing 7 penetrating the container 2, and the connector 20
By connecting the lightning arrester 26 to, the installation of the lightning arrester 26 is completed, and the branch bushing for the lightning arrester 26 becomes unnecessary.

Particularly, in the case of this embodiment, since the lightning arrester 26 is laterally attached to the T-shaped connector 20, the height from the upper surface of the container 2 is very low and the ceiling height is limited in a building or the like. It is suitable for indoor installation.

[Effect of device]

Since the present invention is configured as described above, it has the following effects.

In the lightning arrester mounting device of the present invention, a slip-on type power receiving bushing 7 is provided in an airtight manner in an airtight container 2, and a slip-on type power feeding connector 20 molded in the bushing 7 is detachably connected. To 20,
A power feeding conductor 22 connected to a power cable 8 in a direction orthogonal to a direction of a main circuit conductor 10 penetrating the bushing 7 is embedded, and a slip-on type arrester 26 in which a characteristic element 27 is molded is attached to and detached from a connector 20. Since the grounding terminal 30 is connected to the lightning arrester 26 freely, the slip-on type power receiving bushing 7 is connected to the slip-on type power feeding connector 20, and the slip-on type lightning arrester 26 is connected to the connector 20. Main circuit conductor by connecting
The power cable 8 is connected to 10, and the characteristic element in the main circuit
27 is branched and connected, there is no need to provide a branch bushing unlike the conventional case, the space is not required, the number of parts is small, the structure is simple, and the closed container 2 can be made small. The airtight container 2 does not need to have a mounting hole for forming a branch bushing and an airtight structure, which is required in the related art, so that the mounting work can be facilitated and the cost can be reduced.

[Brief description of drawings]

1 to 3 show an embodiment of a lightning arrester mounting device of the present invention, and FIGS. 1 and 2 show a first embodiment.
FIG. 2 is a schematic front view of a gas-insulated switchgear, FIG. 2 is a cutaway front view of essential parts, and FIG. 3 is a cutaway front view of essential parts of a second embodiment.
FIG. 4 is a schematic front view of a gas-insulated switchgear which is the basis of the present invention. 2 ... Airtight container, 7 ... Power receiving bushing, 8 ... Power cable, 10 ... Main circuit conductor, 20 ... Power feeding connector, 22 ... Power feeding conductor, 23 ... Fitting terminal, 24 ... First fitting terminal, 25 ... Second Fitting terminal, 26 ... Lightning arrester, 27 ... Characteristic element, 29 ... Fitting terminal, 30 ... Grounding terminal.

Claims (1)

[Scope of utility model registration request] 1. A slip-on type power receiving bushing that is airtightly provided in a closed container, a main circuit conductor that is provided through the bushing, and a main circuit conductor that is fixed to the tip of the main circuit conductor located outside the container. A fitting terminal, a slip-on type power supply connector molded and detachably connected to the bushing outside the container, and a power supply cable embedded in the connector and orthogonal to the direction of the main circuit conductor. A connected feeding conductor, a first fitting terminal connected to the feeding conductor and fitted in the fitting terminal of the main circuit conductor so that the fitting terminal is freely separable, and a second fitting terminal connected to the feeding conductor. And a slip-on type lightning arrester molded with a characteristic element and detachably connected to the connector, and connected to one end of the characteristic element and detachably fitted to a second fitting terminal of the power feeding conductor. Fit Terminal and, connected to said other end of the characteristic element, arrester mounting apparatus and a ground terminal derived.