JPH0310652Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of an internal multiphase current transformer device.
In internal multiphase current transformers that are housed in the main body container, busbar container, etc. of gas-insulated switchgear, the single-phase current transformer iron core is usually arranged with the required number of phases, or if it is a three-phase type, the three phases are It is constructed by arranging the equilateral triangles and tightening and fixing them. However, in this device, when a live part such as a circuit breaker or a bus conductor is located nearby, it is necessary to avoid electric field concentration from the viewpoint of preventing dielectric breakdown. There is no problem when sufficient space can be secured between the pair of live parts, but electric field concentration becomes a problem when trying to downsize the container or increase the integration of the equipment to be housed. For this reason, the arrangement of the core of the internal multiphase current transformer device is changed to ensure the dimensions between the live parts as much as possible. This arrangement includes, for example, arranging the iron core along the container.

In this way, when the iron cores of each phase are arranged on a curved line, the shape of the envelope becomes complicated on the inner diameter side. In addition, supporting plates, pressing plates, etc. are used to hold the iron core, but these plates also have a complicated shape along the envelope line in order to secure space. In order to prevent a plate having such a complicated shape from disturbing the electric field between the opposing surfaces of the live parts, the edges of the plate must be shielded. To do this, it is necessary to shave off the corners on the opposite sides of the plate to make the surface smooth, but processing a plate with a complex shape requires a lot of effort, and in some cases it may not be possible to process it. .

In view of the above points, it is an object of the present invention to provide a simple internal multiphase current transformer device that can prevent disturbances in the electric field even when the shapes of the support plate and presser plate are complicated.

The present invention will be explained below with reference to the drawings. Fig. 1 is a simplified side sectional view showing one embodiment of the present invention, Fig. 2 is a longitudinal sectional view taken along the - line in Fig. 1, and Fig. 3 is a schematic side sectional view showing one embodiment of the present invention.
FIG. 4 is an exploded partial perspective view of the internal type multiphase current transformer device shown in FIG.

In addition, in order to facilitate understanding, only one of the three phases is shown in FIGS. 2 to 4.

In the figure, 1 is a metal container placed at ground potential, and inside this is an insulating medium 2 such as SF ₆ gas.
is filled at a predetermined pressure. 3 is an internal three-phase 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.

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 supported by the support plate 7,
A core holding plate 10 common to each phase, a fully threaded stud 11 passing through the plates 7, 8, and 10, a nut 12 screwed into the stud 11, a shield 13 for the support plate,
It consists of a shield 14 for a holding plate, a primary conductor 15, etc. 16, 17, 18 are insulating spacers, 1
9 is an end cover.

As shown in FIG. 1, the three-phase iron cores 9a, 9b, and 9c are arranged along the side wall of the container in a narrow container 1 to ensure a distance from the circuit breaker 4, which is a live part. 3
The phase iron cores 9a, 9b, and 9c are supported by one support plate 7. The support plate 7 supports three-phase iron cores 9a, 9.
It forms an envelope along the outline of b, 9c,
The inner diameter portion, that is, the circuit breaker 4 side has a complicated uneven shape. A primary conductor 1 is attached to the support plate 7 as shown in Fig. 3.
5 through holes 7a, 7b, 7c and a through hole 7d of stud 11 are provided.

In addition, the shield 13 for the support plate has a collar portion 13-
1 and an inner cylinder portion 13-2 attached thereto. The flange portion 13-1 is chamfered to have a smooth outer surface. This brim part 13
-1 is attached with an inner cylindrical part 13-2 whose inside is smoothed, and this inner cylindrical part 13-2 is located inside the iron core 9 as shown in FIG. It extends close to the flange portion 14-1, and an insulating collar 20 is disposed between the two.

The shield 14 for the holding plate is composed of a collar part 14-1 and an arcuate part 14-2 attached to the collar part 14-2 and directed toward the opposing charging part. Collar portion 14 of shield 14
-1 has a smooth surface processed like the flange 13-1 of the shield 13. The arcuate portion 14-2 has a smooth outer surface and is located only in the live part of the iron core 9, that is, in the part facing the circuit breaker 4, and its tip is connected to the groove in the flange 13-1 of the support plate 13. 13-3.

Each of the shields 13 and 14 is constructed approximately as shown in FIG. 4, and is assembled so as to enclose the iron core 9 between them. The current transformer device 3 is fixed to the container 1 by means of studs 11 passing through the support plate 7 and the holding plate 8 at a mounting plate 21 located below the support plate 7. Alternatively, the upper end of the current transformer device 3 may be similarly fixed to the container 1 to prevent sagging.

The current transformer device 3 is assembled, for example, as follows. First, the iron core 9 is placed on the support plate 7, the shield 13 is inserted from below, and the collar 13-1 is fixed to the support plate 7 with bolts 22. At this time, it goes without saying that the bolt 22 should be fixed so that its head does not come out from the flange 13-1.

Next, the stud 11 is inserted into the support plate 7 and fixed with the nut 12. After that, the core holding plate 10 is inserted, and the core 9 is pressed down and fixed with studs 11 and nuts 12. At this time,
The holding plate 10 is designed to maintain a stud 1 for height fluctuations due to rated fluctuations of the iron core 9 (for example, from 2 iron cores to 1 iron core).
Since 1 is a full screw, it can be tightened and fixed at any position.

Next, the holding plate 8 is inserted and fixed at the specified dimensional position with nuts 12 in the same manner as the supporting plate 7. Thereafter, the shield 14 is inserted from above the holding plate 8, and both are tightened with bolts 23. At this time, shield 14
The lowermost end of the arcuate portion 14-2 is the shield 1
Attach it so that it fits into the groove 13-3 provided in the collar 13-1 of No. 3.

According to the configuration of the illustrated embodiment described in detail above,
A shield 13 for the support plate and a shield 14 for the press plate are provided on the outside of the support plate 7 and the press plate 8, and the charging part 4 is
Since the structure is configured so as to shield between the support plate 7 and the press plate 8, even if the support plate 7 and the press plate 8 have a complicated shape, there is no need to consider the electric field at all, and the structure is simple. The inner cylindrical portion 13-2 of the shield 13 and the arcuate portion 14-2 of the shield 14 can be easily fixed with the support plate 7 and the presser plate 8. Furthermore, if the supporting plate 7, the holding plate 8, and the core holding plate 10 are made to have the same shape, it is extremely practical not only in terms of gas cutting and press processing when forming them, but also in terms of common parts.

Note that the core holding plate 10 may also be used as the holding plate 8. However, in this case, depending on the dimensions and number of cores 9, it is necessary to make the dimensions of shields 13, 14 and studs 11 commensurate with the dimensions of core 9.

Alternatively, the inner cylinder portion 13-2 may be attached to the collar 14-1, and the arcuate portion 14-2 may be attached to the collar 13-1.

As described in detail above, according to the present invention, shields are provided on the outside of the support plate and presser plate of the multiphase core, respectively, to cover the portions facing the live parts arranged in close proximity. By effectively arranging the phase cores, no matter how complicated the shape of the live part is, disturbances in the electric field are unlikely to occur in the live part. Moreover, it has a simple structure and has extremely practical effects as an internal current transformer device.

[Brief explanation of drawings]

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;
This figure is an exploded perspective view of the internal multiphase current transformer device shown in FIG. 2, and FIG. 4 is a simplified perspective view for explaining the state of coupling of shields. 1: Container, 4: Circuit breaker, 7: Support plate, 8: Holding plate, 9: Iron core, 13-1, 14-1: Collar, 1
3-2: Inner cylinder part, 14-2: Arc-shaped part.

Claims (1)

[Scope of utility model registration request] Multi-phase cores arranged in parallel in a common container, a multi-phase common support plate and a multi-phase common press plate arranged on the outside of these cores, and the support plate, press plate, and core, respectively. The primary conductor of each phase penetrates through, a shielding collar is provided for each phase on the outside of the support plate and the holding plate, and the other collar is attached to the one collar and extends from the inside of the iron core. an interior comprising a cylindrical part for shielding, which reaches each of the cylindrical parts, and an arcuate part for shielding, which is attached to the other rib part and reaches each of the rib parts from the outside of the part corresponding to the live part of the iron core. type multiphase current transformer device.