JPH0310653Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of an internal current transformer device. An internal current transformer device is used by being housed in a container such as a gas insulated switchgear or busbar device. Incidentally, in a current transformer device, the height of the iron core changes due to a change in rating.

Previously, parts were prepared to accommodate the height of the iron core due to fluctuations in rating. Therefore, there was a drawback that the number of types of parts increased.

In view of this point, the purpose of this proposal is to provide an internal current transformer device in which parts are standardized.

The present invention will be described below with reference to embodiments of the drawings. In Figure 1, 1 is a metal container placed at ground potential, and inside is an insulating medium 2 such as SF ₆ gas.
is filled at a predetermined pressure. 3 is an internal current transformer device disposed in the container 1, 4 is a circuit breaker connected in series with the device 3, and 5 and 6 are grounding devices provided on both sides of the circuit breaker 4.

In this embodiment, the current transformer device 3 includes a support plate 7 common to each phase, a holding plate 8 common to each phase, an iron core 9 of each phase supported by the support plate 7, and a core holding plate 1 common to each phase.
0, a fully threaded stud 11 that passes through the plates 7, 8, and 10, a nut 12 screwed into the stud 11, a shield 13 for the support plate, a shield 14 for the presser plate,
It consists of a primary conductor 15 and the like. 16,17,1
8 is an insulating spacer, and 19 is an end cover.

The shield 13 is applied to the lower side of the plate 7, and the shield 14 is applied to the upper side of the plate 8, and they are inserted so as to be close to each other. 20 is shield 13,1
This is an insulating ring to prevent one turn from being formed by 4. Further, the core cover portion of the shield 14 is provided on the opposing live portion, that is, on the side of the circuit breaker 4.

As shown in FIG. 2, the iron core 9 is arranged along the side wall of the container so as to ensure a distance from the circuit breaker 4 within the narrow container 1 for three phases. The iron cores 9 for three phases are supported by one support plate 7. The support plate 7 forms an envelope that roughly follows the outer shape of the three phases of the iron core.
As shown in the figure, a through hole 7a for the primary conductor 15 and a through hole 7b for the stud 11 are provided. 21 is a mounting plate provided inside the container 1 for supporting the device.

The stud 11 passes through the support plate 7, the presser plate 8, and the core presser plate 10, respectively. nut 12
Accordingly, the distance between the support plate 7 and the presser plate 8 is set to the maximum allowable dimension and is fixed. The iron core 9 is placed on the support plate 7 and is pressed and fixed by a presser plate 10. The core holding plate 10 can be fixed at any position on the fully threaded stud 11 by adjusting the nut 12 that supports and fixes it. Therefore, even if the longitudinal dimension of the iron core 1 changes due to rating fluctuations, etc., the same parts can be used. If deflection of the internal current transformer device 3 is unavoidable, the holding plate 8 or the shield 14 may be fixed to the container 1.

In the above embodiment, since the fully threaded stud is inserted into the core holding plate 10, the core holding plate 10 can be fixed at a predetermined position between the supporting plate 7 and the holding plate 8, and therefore, the core holding plate 10 can be fixed at a predetermined position between the supporting plate 7 and the holding plate 8. Even if the height changes, it can be handled with the same parts, reducing the number of parts. Further, if the stud 11 is inserted through the mounting plate 21, it is convenient because no separate member is required to support the internal current transformer device 3 to the container 1. Furthermore, if the support plate 7, presser plate 8, and core presser plate 10 have the same shape, the number of types of parts will be reduced, which is convenient.

In the above embodiment, a three-phase system has been described, but it goes without saying that it can also be applied to a single-phase system.

As detailed above, according to the present invention, since a fully threaded stud is used, the core holding plate can be fixed at any position between the supporting plate and the holding plate, and the same component can be used for cores of different heights. This has the effect of providing an internal current transformer with standardized parts.

[Brief explanation of the drawing]

FIG. 1 is a simplified side sectional view showing one embodiment of the present invention;
Figure 2 is a longitudinal sectional view taken along the - line in Figure 1;
The figure is an exploded perspective view of the one shown in FIG. 1. Note that FIGS. 1 and 3 show only one of the three phases. 1: Container, 2: Insulating medium, 7: Support plate, 8: Holding plate, 9: Iron core, 10: Core holding plate, 11: Stud, 12: Nut.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A core holding plate disposed between a support plate and a holding plate in a container filled with an insulating medium, and a core holding plate fixed between the supporting plate and the core holding plate. and a stud having a full screw that passes through the core holding plate and reaches the supporting plate and the holding plate, and fixing means for fixing the core holding plate to the stud. An internal current transformer device featuring: (2) The internal current transformer device according to claim 1 of the utility model registration claim, in which the stud passes through the supporting plate, the holding plate, and the core holding plate. (3) The internal current transformer device according to claim 1, wherein the supporting plate, the holding plate, and the core holding plate have the same shape.