JP2009021143A - Bushing for electric device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an economical bushing for an electric device capable of being easily mounted on a tank of the electric device, economical as a replacement bushing, easily connected with an electric device main body side, and easily replaced. <P>SOLUTION: In this bushing 1 for the electric device, a central conductor 3 is disposed in a polymer insulator tube 10, an upper terminal 4 for connecting the central conductor 3 with a system line, is disposed on an upper end of the insulator tube 10, and a flange is fixed to a lower end of the insulator tube. An adaptor 11 for adjustment is disposed between the flange of a lower end of the polymer insulator tube 10 and the tank 6, the bushing 1 is mounted on the tank 6 of the electric device, and a lower end of the central conductor 3 is connected with the electric device main body side through a connection terminal 7. Further the length dimension of the central conductor 3 can be adjusted by two hollow members 3A, 3B fitted, and the hollow members 3A, 3B are electrically connected by a current collector 3C. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a bushing for electrical equipment such as a gas circuit breaker, a gas insulated switchgear, and a transformer, and more particularly to an electrical equipment bushing that is easy to install and suitable for replacement.

  In general, various electric devices such as a gas circuit breaker, a gas insulated switchgear, and a transformer are used in an electric power system that transmits and receives electric power. These electric devices have a bushing that serves as an air outlet terminal, and the bushing is connected to a power transmission line or connected to another electric device via a lead wire.

  In a conventional electric device, for example, a gas circuit breaker, an electric device bushing 1 as shown in FIGS. 8A and 8B is used. This electrical equipment bushing 1 has a central conductor 3 connected to the interior of an electrical equipment disposed in a porcelain soot tube 2, and is insulated with an insulating gas serving as an insulating medium. An upper terminal 4 for connecting the central conductor 3 to the system line is provided on the upper end side of the porcelain porcelain tube 2, and a flange 5 is fixed to the lower end of the porcelain porcelain tube 2. The electric device bushing 1 is attached to the tank 6 of the electric device using the flange 5, and the lower end of the center conductor 3 is connected to the electric device main body (not shown) via the connection terminal 7.

In general, the porcelain soot tube 2 used for the electrical appliance bushing 1 may have a different length L ₀ depending on a place where the electrical equipment is installed, for example, a fouling area such as salt damage near the sea. As shown in FIG. 8 (b), the length of the folds on the outer surface of the tub tube 2 is partially increased to be used. For this reason, the antifouling type bushing 1 for electric equipment is a long and expensive product with an extremely high system voltage.

  Recently, it has been known that the porcelain soot tube 2 has a deterioration phenomenon mainly due to the ingress of moisture in the bush 1 for electric equipment. For this reason, in electrical equipment that has been installed for a long period of, for example, 20 years or more after installation, in order to prevent the occurrence of serious accidents due to the porcelain soot 2 portion of the bushing 1 for electrical equipment, Inspection inspection is performed.

  The electrical appliance bushing 1 in which the porcelain porcelain pipe 2 has been deteriorated in the inspection is promptly replaced to prevent a serious accident caused by the electrical equipment. In addition, even when the porcelain steel tube 2 of the bushing 1 for electrical equipment is damaged due to an earthquake or the like, the electrical equipment bushing 1 is replaced every time and the electrical equipment is quickly restored. Yes. For such a bush 1 for electric equipment for replacement, even if it is an electric equipment that has been used for a long time and has a short remaining service life, the same structure as that at the time of manufacture is usually used.

  On the other hand, instead of a porcelain porcelain tube, a polymer porcelain tube which is an insulator has been proposed, and it has also been proposed to configure a bushing for an electric device using this polymer porcelain tube (for example, Patent Documents). 1).

JP 11-329121 A

  However, as described above, the bushing 1 for electric equipment using porcelain steel pipes is prepared according to the defaced area where the electric equipment is installed even if the same spare parts are prepared for replacement. Even for the same voltage, the length is large, medium, small, for example, and there are many kinds and long heavy objects, so it is necessary to secure a storage place. Moreover, since the bushing 1 for electrical equipment is an expensive product, there exists a problem which is not economical only by storing for a long period of time.

  Moreover, even if the bushing 1 for electric equipment having the same structure as that at the time of manufacture is replaced and renewed as described above, the electric equipment with a short remaining service life will soon reach the end of its product life. Replacing the bushings for equipment was uneconomical. In addition, porcelain porcelain pipes have a drawback that they cannot be handled in an emergency because it takes a long time to deliver a product even if a new purchase is arranged.

  In addition, the bushings for electrical equipment using polymer insulators have the same length and higher anti-fouling performance than porcelain insulators, so the length and diameter of the insulators can be reduced and manufactured at low cost, but the service life It was considered short and was not used much. In addition, in the case of a polymer soot tube, the length and diameter are small at the same voltage as compared to a porcelain soot tube, so that the entire bushing for electrical equipment has a small structure.

  Therefore, the size of the bushing for electrical equipment using a polymer soot pipe is different from that of the conventional product, so it is difficult to attach it to an existing electrical equipment tank even if it is used for replacement with its structure. There also arises a problem that the connection to the electrical equipment body side must be devised.

  An object of the present invention is to provide an electrical device bushing that can be easily attached to an electrical device tank and is economical for replacement.

  Another object of the present invention is to provide an economical bushing for an electric device that can be easily connected to the electric device main body and can be easily replaced.

  The bushing for electrical equipment of the present invention is arranged in a vertical pipe, a central conductor is disposed, an upper terminal for connecting the central conductor to the system line is provided at the upper end of the vertical pipe, and a flange is fixed to the lower end to be attached to a tank of the electrical equipment. When the center conductor is connected to the electrical equipment body side via a connection terminal, the soot pipe is made of polymer, and an adapter for adjusting dimensions is provided between the flange of the polymer soot pipe and the electrical equipment tank. It is characterized by being configured.

  Preferably, the lower end of the central conductor is electrically connected to the main body side of the electrical apparatus with an adjustment adapter conductor interposed therebetween.

  The bushing for electrical equipment according to the present invention has a central conductor disposed in the vertical pipe, an upper terminal for connecting the central conductor to the system line is provided at the upper end of the vertical pipe, and a flange is fixed at the lower end to the tank of the electrical equipment. When the center conductor is connected to the electrical equipment main body side via a connection terminal, the rod is made of polymer, and the center conductor can be adjusted in length by two hollow members to be fitted. At the same time, the hollow members are electrically connected by collecting current, and an adapter for dimensional adjustment is provided between the flange at the lower end of the polymer pipe and the electric equipment tank.

  Preferably, the adapter has a plate shape having an opening at the center or a hollow cylindrical shape.

  If comprised like this invention, the bushing for electric equipments using the polymer pipe | tube can be economically used for replacement | exchange by use of an adapter, and the attachment to an electric equipment tank can also be performed easily without trouble.

  In addition, if a bushing for an electrical device is configured using a central conductor in which the hollow outer pipe and the hollow inner pipe are electrically connected, the dimensions of the central conductor can be easily adjusted, so the connection to the electrical device body side is easy. Thus, the replacement work can be performed very easily. In addition, since the number of types of the bushings for the electrical equipment can be reduced, it can be held more economically than before for emergency use.

  The bushing for electrical equipment to be attached to the tank of the electrical equipment of the present invention has a central conductor disposed in the vertical pipe, an upper terminal for connecting the central conductor to the system line is provided at the upper end of the vertical pipe, and a flange is fixed to the lower end. Is connected to the electrical equipment main body side via a connection terminal. A bushing bush is made of a polymer, and an adapter for dimensional adjustment is provided between the flange of the flange and the electrical equipment tank. In addition, the length of the center conductor can be adjusted by two hollow members to be fitted together, and the hollow member can be electrically connected by collecting current to use an object.

Hereinafter, the present invention will be described with reference to FIGS. A bushing 1 for an electric device according to the present invention shown in FIG. 1 uses a soot tube 10 made of a polymer that has high antifouling performance and can have a length L ₁ and a diameter D ₁ smaller than those made of porcelain. And it attaches to the tank 6 of an electric equipment directly or to the part called a bushing pocket by the flange 5 provided in the lower end of the polymer pipe 10. The central conductor 3 arranged inside the tub tube 10 is connected to the upper terminal 4 whose upper end is connected to the system line and the lower end is connected to an electric equipment body (not shown) via the connection terminal 7 as in the conventional case. Yes.

  In order to make it easy to attach the bushing 1 to the tank 6 of the electric device, in the present invention, the central conductor 3 penetrates between the flange 5 fixed to the lower end of the polymer pipe 10 and the tank 6 of the electric device. A plate-shaped adapter 11 having an opening 11A as a center is interposed.

The adapter 11 is used for adjustment to absorb the dimensional difference when the electric device is attached to the tank 6 because the length L ₁ and the diameter D ₁ of the soot tube 10 are different between the existing bushing 1 and the replacement bushing 1. Is. Thereby, it can attach to the tank 6 of an electric equipment without a problem, and the center conductor 3 can be used by connecting with the electric equipment main body side by the connection terminal 7. FIG. The adapter 11 is used by being fixed to the flange 5 or the tank 6 of the polymer soot tube 10 in advance so that the attaching operation of the bushing 1 can be easily performed.

  When a replacement bushing 1 using a polymer soot pipe 10 is attached to a tank 6 of an electric device, when a gap is generated between the central conductor 3 and the electric device main body side, FIG. An adjustment adapter conductor 12 having a length corresponding to the gap dimension as shown in b) is used. By interposing the adjustment adapter conductor 12 in the connection terminal 7 portion, the central conductor 3 and the electrical device main body are electrically connected, and the dimensional difference is absorbed and the bushing using the polymer pipe 10 is used without any trouble. 1 can be exchanged. For this reason, the number of spare bushings prepared for replacement is very small, which is economical.

  3 is connected to the upper terminal 4 because the length and diameter of the polymer tube 10 are different between the existing bushing 1 and the replacement bushing 1 as described above. This considers the electrical connection when a dimensional difference occurs between the power line and the system line.

  This bushing for electrical equipment uses a container formed in a hollow cylindrical shape as an adapter 11 for adjusting the height dimension, and is attached to a tank 6 of the electrical equipment. And the example which connected the center conductor 3 and the electric equipment main body side via the adapter conductor 12 similarly to FIG. 2 is shown.

  Further, the bushing 1 for an electric device using the polymer soot tube 10 of the present invention shown in FIG. 4 has a center that can be easily electrically connected when a gap is generated between the central conductor 3 and the electric device main body side. The example of another countermeasure which devised the structure of the conductor 3 is shown. The center conductor 3 is fitted with the outer hollow member 3A and the inner hollow member 3B so that the length of the center conductor 3 can be adjusted by extending the hollow member 3B as indicated by a broken line, thereby making the center conductor 3 compatible. The center conductor 3 can be used for a different length.

  Specifically, as shown in FIG. 5, the outer and inner hollow members 3A and 3B are fitted together, and the space between the hollow members 3A and 3B is, for example, by a current collector 3C disposed in an annular groove on the inner surface of the hollow member 3A. Electrically connected. The hollow members 3A, 3B are electrically connected via a current collector 3C generally called a multi-ram contact, in which a commonly used copper or aluminum highly conductive metal pipe is used, and a leaf spring is formed between them. Connecting.

  Moreover, the bushing 1 for electric equipments using the polymer soot pipe 10 of this invention shown in FIG. 6 uses the hollow cylindrical adapter 11 for adjustment of a height dimension similarly to FIG. 3, and also shows in FIG. In this example, the hollow members 3A and 3B are used to form the central conductor 3. With such a structure, the gap generated when the existing one is made into a bushing using the replacement polymer rod 10 is absorbed, and the connection between the upper terminal 4 and the system line or the central conductor 3 and the electric device are absorbed. Both the connection with the main body can be performed without any problem, and the bushing can be quickly replaced in an emergency.

  When the central conductor 3 formed by two hollow members 3A and 3B as shown in FIGS. 4 to 6 is used for the bushing 1 for an electrical device using the polymer soot tube 10, the length can be adjusted by the central conductor 3 itself. Therefore, the adapter conductor for adjustment can be made unnecessary, and even if the length of the central conductor 3 is different, the bushing can be used together.

  FIG. 7 shows an example in which the electrical equipment bushing 1 having the structure shown in FIG. 6 according to the present invention is applied to a gas circuit breaker. In this example, a bushing 1 using a polymer soot tube 10 is used instead of the existing porcelain soot tube. In order to absorb the dimensional difference caused by the use of the electrical appliance bushing 1, a hollow cylindrical container is used as the height adjustment adapter 11, and the height adjustment adapter 11 is used. The central conductor 3 formed by the members 3A and 3B is used. With this structure, the connection between the upper terminal 4 and the system line and the connection between the central conductor 3 and the gas circuit breaker main body can be performed without any problem.

It is a schematic longitudinal cross-sectional view which shows the bushing for electric devices which is one Example of this invention. (A) And (b) is a schematic longitudinal cross-sectional view which shows the example of the principal part of FIG. 1, respectively. It is a schematic longitudinal cross-sectional view which shows a part of bushing for electrical devices which is the other Example of this invention. It is a schematic longitudinal cross-sectional view which shows the bushing for electric devices which is another Example of this invention. It is a schematic longitudinal cross-sectional view which expands and shows the principal part of FIG. It is a schematic longitudinal cross-sectional view which shows the bushing for electric devices which is another Example of this invention. FIG. 7 is a side view showing a partial cross-section of a gas insulated circuit breaker to which the bushing for electric equipment of FIG. 6 of the present invention is applied. (A) And (b) is a schematic longitudinal cross-sectional view which respectively shows the bushing for conventional electric equipments.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Electric equipment bushing, 3 ... Center conductor, 3A, 3B ... Hollow member, 3C ... Current collection, 4 ... Upper terminal, 5 ... Flange, 6 ... Tank, 7 ... Connection terminal, 10 ... Polymer pipe, 11 ... Adapter, 12 ... Adapter conductor.

Claims (5)

  A central conductor is disposed in the vertical pipe, an upper terminal is provided at the upper end of the vertical pipe to connect the central conductor to the system line, and a flange is fixed to the lower end to be attached to the tank of the electrical equipment. The central conductor is connected via the connection terminal. In the electrical equipment bushing to be connected to the electrical equipment body side, the soot pipe is made of a polymer, and an adapter for adjusting dimensions is provided between a flange of the polymer soot pipe and an electrical equipment tank. Bushing for electrical equipment.   2. The bushing for an electric device according to claim 1, wherein the lower end of the central conductor is electrically connected to the electric device main body side with an adjustment adapter conductor interposed therebetween.   A central conductor is disposed in the vertical pipe, an upper terminal is provided at the upper end of the vertical pipe to connect the central conductor to the system line, and a flange is fixed to the lower end to be attached to the tank of the electrical equipment. The central conductor is connected via the connection terminal. In the electrical equipment bushing connected to the electrical equipment body side, the rod tube is made of polymer, and the center conductor can be adjusted in length by two hollow members to be fitted together, and the hollow member can be adjusted between the hollow members. A bushing for electrical equipment, characterized in that the electrical adapter is electrically connected by an electron and an adjustment adapter is provided between a flange at the lower end of the polymer soot tube and an electrical equipment tank.   4. The bushing for an electric device according to claim 1, wherein the adapter has a plate shape having an opening at the center.   The bushing for an electric device according to any one of claims 1 to 3, wherein the adapter has a hollow cylindrical shape.

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