JPH0217470Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a through-type current transformer installed, for example, in a bushing pocket of a transformer, and more particularly to a structure for mounting the current transformer body into the pocket of a container housing the current transformer body.

Conventionally, in order to attach a through-type current transformer to a bushing pocket of a transformer, for example, as shown in Fig. 1,
A current transformer receiver 3 is provided inside the pocket 2 that supports the lead bushing 1 of the transformer, and one or more current transformer bodies 5 are stacked on the current transformer receiver 3 and provided at the tip of the pocket 2. A structure was adopted in which the current transformer main body 5 was clamped and fixed by the bushing receiving seat 4. However, according to this structure, the installation and fixing work of the current transformer main body 5 must be performed from the tip of the pocket 2 after the pocket 2 is assembled. When installing the device, work must be done at height, which makes work difficult and requires a lot of time. Further, when it is necessary to change the position of the current transformer receiver 3 due to improvement or addition of a current transformer, there is a drawback that a lot of time and cost are required to remodel the pocket 2.

Conventionally, as another means, as shown in FIG. 2, it has been considered that the container 6 containing the current transformer body is tightly fixed with bolts or the like so as to be suspended from the inner surface of the bushing receiving seat 4. There is.
With this configuration, the through-type current transformer can be fixed in advance to the bushing receiving seat 4 regardless of the assembly of the pocket 2, and then lifted and attached to the pocket 2, which can reduce work at heights and simplify the installation work. . However, in this configuration as well as in the configuration shown in FIG.
The insulating oil inside the current transformer does not circulate sufficiently to the upper part of the current transformer body, and in extreme cases, voids may be trapped, resulting in unfavorable results from an insulation or cooling standpoint.

In addition, in order to attach the current transformer body to the bushing receiving seat 4, the bushing receiving seat 4 must be turned upside down, which is difficult to do with a heavy through-type current transformer, and the work may be difficult if the bushing receiving seat 4 is moved too much. There is also a risk of winding misalignment in the current transformer body.

Furthermore, the total weight of the current transformer main body 5, container 6, and other accessories will be added to the bolts that are attached to the bushing receiver 4, so the mechanical strength of the attachment bolts must be increased, and the thickness of the bolts must be increased. An increase in the number of wires or the number of wires causes an economic disadvantage, and the structure also becomes complicated.

The purpose of this invention is to provide a through-type current transformer that can be easily installed in a pocket, has a strong mechanical structure, is convenient for modifying or adding to a through-type current transformer, and has improved insulation and cooling performance. The present invention provides a through-type current transformer.

Hereinafter, the present invention will be described with reference to embodiments shown in the drawings. In Fig. 3, an outlet bushing 1 consisting of a support metal fitting 1a, an upper insulator tube 1b, and a lower insulator tube 1c is attached to the upper end opening of the transformer pocket 2 via a bushing receiving seat 4 that oil-tightly closes the upper end opening. It is being A seat 7 that protrudes toward the inner surface is provided inside the pocket 2, and one or more current transformer bodies 5 are housed and fixed in the seat 7, and the container 6 itself is independent of the pocket 2. Place it and attach it by tightening the bolts. In this case, the container 6 is placed around the support metal fitting 1a, which is the ground potential part of the two-pocket bushing 1. Further, an appropriate distance G is formed between the upper surface of the container 6 and the flange receiving seat 4, and the inside of the pocket 2 is filled with insulating oil 8. Therefore, with such a configuration, when a plurality of through-type current transformers are installed in the pocket 2, the container 6 in which the plurality of current transformer bodies 5 are installed is lifted up in advance from the ground and placed in the pocket 2. It only needs to be installed inside, which improves the ease of assembly. Also,
Even when modifying or adding a through-type current transformer, the work is extremely simple since it is only necessary to replace the container 6 in which the modified or added current transformer body is housed and fixed.

In addition, since an appropriate distance G is formed between the container 6 and the butting seat 4, the pocket 2
The insulating oil 8 inside the current transformer body 5 is sufficiently circulated to the upper part of the current transformer main body 5, so that void traps and the like do not occur, and insulation and cooling performance are greatly improved, resulting in high reliability.

Furthermore, since the container 6 is not attached to the bushing receiving seat 4, there is no need to turn it upside down when assembling the through-type current transformer in advance, which improves work efficiency and prevents winding misalignment of the current transformer body 5. There's no fear. Moreover, since the entire weight of the current transformer main body 5, container 6, and other accessories is supported by the seat 7, stability is good, and it is economical and has a simple structure without unnecessary mechanical reinforcement such as bolts. It becomes easy.

As described above, according to the present invention, when installing a through-type current transformer in a pocket, even if the pocket is located at a high place, it is not only possible to install the current transformer safely and quickly, but also to reduce the mechanical structure. Strong, even when modifying or adding a through-type current transformer, the current transformer can be replaced economically and quickly without requiring modification of the pocket, and has significantly improved insulation and cooling performance. An improved feedthrough current transformer can be obtained.

[Brief explanation of the drawing]

1 and 2 are sectional views showing a conventional mounting structure for a through-type current transformer, and FIG. 3 is a sectional view showing a mounting structure for a through-type current transformer according to the present invention. 1...Meeting butsing, 2...Pocket, 4
...Bushing receiver, 5...Current transformer body, 6...
...Container, 7... Seat, 8... Insulating oil, G... Spacing.

Claims (1)

[Scope of utility model registration request] An outlet bushing is attached to the upper end opening of a transformer pocket filled with insulating oil via a bushing receiving seat that oil-tightly closes the upper end opening, and the outlet bushing is attached so as to pass through the pocket. In the through-type current transformer, a seat that projects inward is formed on the inner surface of the pocket, and a container that accommodates the current transformer body and is independent of the pocket is placed on the seat, with the upper surface of the container and the bushing receiver. A through-type current transformer characterized in that it is mounted and fixed so that a gap is formed between it and the seat.