JPS6013249B2 - Multi-tier insulation tube - Google Patents

Description

[Detailed description of the invention] The present invention relates to an insulating cylindrical structure that supports a high potential section.

Conventionally, in order to support a high potential part in a closed container with an insulating node from a grounded tank, it is often supported by a single supporting insulating cylinder with a production length that is allowed by equipment. By the way, in the case of equipment that operates at ultra-high voltage or higher, in order to support it with a single insulating cylinder, it must be made large in both length and thickness. Further, even if manufacturing is possible due to equipment, a large shield must be attached to the high voltage side because the electric field on the high voltage side is higher than near the middle of the insulating tube. Incidentally, FIG. 1 shows the potential distribution when two insulating cylinders 2 are simply connected in series and a normal intermediate shield 5 is provided as a means to obtain the insulation length.

According to this, since approximately 80% of the total force is borne by the insulating tube on the high voltage side, there are problems such as the electric field near the shield 6 of the high potential section 11 becoming considerably high. In the diagram, 1 is the low gift part, 1
2 is a low potential shield, and 6 is a high potential shield. An object of the present invention was to eliminate the above-mentioned disadvantages, and to provide a multi-tiered insulating tube that improves potential sharing through a shield structure at the connecting portion of the insulating tube and effectively utilizes the insulation length. It is to be.

Embodiments of the present invention will be described below with reference to FIGS. 2 to 4.

As shown in FIG. 2, for example, in a buffer type gas sheath disconnector, a sheath disconnection section 21 is housed in a tank 20 together with an insulating gas 20a such as SF6 gas.

This shingle section 21 is provided with a fixed contact section 23 and a movable contact section 25 facing each other, and the fixed contact section 23 is connected to the insulating support section 22.
The tank 2 is supported by a terminal 23a.
Further, the movable contact 25 is supported by an insulating support portion 27 via a buffer chamber 26 and connected to a terminal 25a. The buffer chamber 26 is connected to an operating portion 29 via an insulated operating rod 28 that passes through an insulated support 27 . In this manner, the electrical conductor is supported by the insulating supports 22 and 27 and hermetically led out to the outside by the insulating spacer 24 via the terminals 23a and 25a, respectively.

FIG. 3 shows an insulating support part 22 in which the high potential part 11 is supported by two insulating cylinders 2 arranged in series, with a shield 4 in the middle,
5 was set.

In this case, in order to improve the sharing ratio of the potential carried by each insulating cylinder, the inner shields 8 and 9 of the connection part are replaced with the outer shields 4 and 9.
The inner shield 7 is made to protrude upward and downward from the outer shield 6, and the high potential side shield also protrudes from the outer shield 6. Note that 12 is a low potential shield. Shields 7, 8, inside the insulating cylinder
9 improves the potential sharing ratio, and the outer shield 12,
4, 5, and 6 widen the distance between opposing electrodes for electric field relaxation.

The radius of curvature of each shield is made smaller as it goes from the high potential side to the low potential side, since the electric field strength decreases as it goes from the high potential side to the low potential side. FIG. 4 shows the potential distribution state of the insulating support part 22 shown in FIG. 3. By providing a shield inside the insulating tube and shortening the distance between the opposing shields 7 and 8, potential sharing is improved. , represents the relaxation of the electric field near the shield 6. The potential applied to each insulating cylinder is determined by the shape of the tank, the shape of the opposing shield, and the distance. In order to improve the sharing ratio, it is possible to improve the withstand voltage by optimizing each configuration. That is, if the capacitance between the low potential part 1 and the shield 9 inside the insulating cylinder is C, then the distance between the shield 8 inside the insulating cylinder and the high potential internal shield 7 provided in the high potential part 11 is compared to the former. Since the capacitance C2 is brought close to each other, the capacitance C2 can be increased. 20% in Figure 1
By increasing the capacitance C2 between the shields 8 and 7 located on the high voltage side as described above, the potential V of the shields 4 and 5 located at the connection part is
It can be raised by increasing C2 from chapter 3. Therefore, it is possible to improve the burden of insulation between the high potential section 11 and the shields 4 and 5. FIG. 5 shows the insulating support part 27, in which the operating insulating rod 3 passes through the inside of the insulating cylinder 2, and in this case as well, the electric field distribution can be improved as in the case of FIG.

Note that FIGS. 6 and 7 show other embodiments of the present invention,
Parts having the same functions as those in FIGS. 3 and 5 are given the same reference numerals.

A power transfer conductor 10 is mounted on a post, two conductors 2 are connected in series and supported, and housed in a tank la, with a high potential shield 6, intermediate shields 4 and 5, and a low potential shield 12 provided on the outside. By providing internal shields 7 and 8 as shown in FIG. 7, the electric field distribution can be relaxed and an effective insulation length can be obtained, similarly to the present invention. As described above, the present invention has focused on two-tiered stacking in the embodiments, but the same effects as the present invention can be obtained by configuring multi-tiered stacking such as three-tiered or four-tiered stacking.

It goes without saying that the multi-layered insulating cylinder of the present invention can be applied not only to the above-mentioned insulating cylinders but also to electrical equipment for supporting military units. As described above, according to the present invention, a plurality of insulating cylinders are connected in multiple stages, and an external intermediate shield and an internal intermediate shield are provided at this connection part, and the shield provided on the inside on the high potential side of the same insulating cylinder is on the outside. By creating a shield structure in which the shield provided on the insulating cylinder axis protrudes toward the low-potential part side on the insulating cylinder axis, and the shield provided on the inside of the low-potential part protrudes from the outer shield on the insulating cylinder axis towards the high-potential part side. , it is possible to provide a multi-tiered insulating cylinder that can improve potential sharing and effectively utilize the insulation length.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing the potential distribution when two conventional insulating cylinders are arranged in series, and Fig. 2 is a partially cutaway view showing a buffer type gas shield and breaker to which the multi-layered insulating cylinder of the present invention is applied. 3 is a longitudinal sectional view showing a multi-layered insulating tube of the present invention, FIG. 4 is a longitudinal sectional view showing the potential distribution of the multi-layered insulating tube of the present invention, and FIG. 5 is a longitudinal sectional view showing a multi-layered insulating tube of the present invention. FIG. 6 is a cross-sectional view showing still another embodiment of the present invention, and FIG. 7 is a cross-sectional view taken along the line of Machiichi in FIG. 6. 1...Low potential part, 2...Insulating tube, 3,
28...Operating insulation od, 4,5...
Intermediate shield, 6...High potential shield, 7...
...High potential internal shield, 8...Inner intermediate shield, 11...High potential section, 12...Low potential section shield. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] 1. In the case where the insulating support part that insulates and supports the high potential part from the low potential part is composed of a plurality of insulating tubes arranged in series,
An outer intermediate shield is provided on the outer periphery of the connection part of the insulating cylinder and protrudes coaxially with the insulating cylinder toward the high potential part side, and an outer intermediate shield is provided on the outer periphery of the insulating cylinder and is provided on the high potential part and the low potential part on the low potential part side, respectively. and a high potential shield and a low potential shield protruding toward the high potential part side, and an inner intermediate shield located inside the insulating cylinder and electrically connected to the outer intermediate shield is provided at the connection part of the insulating cylinder on the high potential part side. A high potential internal shield is provided to protrude toward the internal intermediate shield and is connected to the high potential part so as to face the internal intermediate shield, with the high potential internal shield protruding toward the low potential part side more than the high potential shield. The multi-layered insulating cylinder is characterized in that the inner intermediate shield projects closer to the high potential part than the outer intermediate shield.