JPS6240472Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an air shield that is attached to a bushing terminal portion used in a transformer, a reactor, etc., for example.

In order to alleviate electric field concentration at the bushing terminal part, an air shield 1 is generally used, mainly made of aluminum plates or pipes, as shown in Figures 1 to 4.
a, 1b, 1c, and 1d are attached.

When the operating voltage is low, the shape of the shield is small and the mounting position is relatively low from the ground, so the work of installing the shield to the bushing terminal section 4 and the work of attaching and pulling out the lead wire 6 to the bushing terminal 5 is difficult. It is relatively easy for the operator to approach the working position.

However, as the voltage increases, the shape becomes larger and the mounting position becomes higher. For example, a bushing air shield used for 1000KV class equipment has a diameter of several meters and an installation height of 20 meters. It is difficult to attach and remove the air shield to the bushing, and to attach and remove the lead wires from outside the shield, which requires a worker to enter inside the shield. .

In such work, conventionally, as shown in Fig. 5, the gondola 7 is suspended from an overhead crane 8.
There is a method in which a worker is placed on a gondola and transferred to a platform 12 inside the shield using a fixed ladder 10 inside the shield, and a method in which the gondola 7 is hung on a tow truck 9 shown in FIG. A method of transferring from the footboard 11 to the platform 12 inside the shield is used.

In the above-mentioned work, there is a sway of the gondola 7 and a gap between the entrance/exit of the shield 1 and the gondola 7, which is an unfavorable condition in terms of safety. Further, the overhead traveling crane 8 has disadvantages such as limited locations and the inability to place equipment at desired positions.

This idea was made to eliminate the drawbacks of the conventional ones as mentioned above, and by providing an opening for work and a transfer means that can be pulled out from this opening, it is safe and efficient. The object of the present invention is to provide an air shield that can be used for work and can be stored when not in use, thereby preventing concentration of electric fields during energization.

An embodiment of the air shield of this invention will be described below with reference to FIGS. 6 to 9. 1 in the figure,
2, 4, 7, 9, 11, and 12 are the same as the conventional ones in FIG. 13 is a step board that can be pulled out from the opening for worker entry in the shield 1;
Fixed footboard 11 as shown in FIGS. 7 to 9
A plurality of rollers 1 move inside the guide 14 installed above.
5 so as to be slidable. In this way, when carrying out work, the step board 13 is pulled out to the outside of the shield 1 as shown in Fig. 6, and the gap between it and the gondola 7 is completely eliminated before the worker can enter or exit. The work is done safely and efficiently. It goes without saying that the footboard 13 of the present invention is also effective when using an aerial work vehicle 18 with a work platform 16 attached to a boom 17 as shown in FIG.

The aerial work vehicle 18 can perform work with high safety without shaking the work platform 16 compared to work using the gondola 7 as shown in FIGS. 5 and 6. When using the aerial work vehicle 18, it is also possible to pull out the sliding ladder 19 stored inside the shield 1 into the work platform 16 and transfer from the work platform 16 to the inside of the shield 1 as shown in FIG. It is. As shown in FIG. 11, this sliding ladder 19 slides within a guide 20 provided inside the shield 1, and is fixed with pins 21, bolts 22, etc. during use. Also guide 2
0 has a roller (not shown) for smooth movement.
It is also a method to put something like this.

As described above, according to this invention, by providing an opening for work and a transfer means that can be pulled out from this opening, work can be done safely and efficiently, and it can be stored when not working. By making this possible, it is possible to provide an air shield that prevents electric field concentration during energization.

[Brief explanation of drawings]

Figures 1 to 4 are schematic diagrams showing the structure of a commonly used bushing air shield, Figure 5 is an explanatory diagram showing the structure and method of operation of a conventional air shield, and Figures 6 and 7. The figure is an explanatory diagram showing the schematic structure and working method of the air shield in one embodiment of this invention, and Figures 8 and 9 are perspective views and cross-sections showing the detailed structure of the footboard in Figures 6 and 7. figure,
FIG. 10 is an explanatory diagram showing the structural outline and working method of an air shield in another embodiment of this invention;
FIG. 1 is a perspective view showing the detailed structure of the sliding ladder in FIG. 10. In the figure, reference numeral 1 indicates an air shield, and reference numerals 13 and 19 indicate a step board and a sliding ladder as means for transferring.
Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) An opening provided in the shield body for work inside the shield body, and an opening provided in the shield body for carrying out the work, which is pulled out from the opening through which the shield An aerial shield that can be moved inside the main body and is equipped with a transfer means that is stored inside the shield main body when not working. (2) The aerial shield according to claim 1 of the utility model registration claim, wherein the transfer means is a step board. (3) The aerial shield according to claim 1 of the utility model registration, characterized in that the transfer means is a ladder.