JPS583563B2 - Zetsuentou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an insulating cylinder used in particular as a support for high voltage equipment.

In high voltage equipment, there are many places where the live parts are fixed to a ground potential member using an insulating tube.

For example, as shown in Figure 1, in a gas breaker,
A breaker 1 of a high-voltage charging part is gas-insulated and housed in a tank 2 at ground potential, and the breaker 1 is fixed to a part of the tank 2 with an insulating tube 3.

A plurality of embedded metal fittings 5 and 6 are embedded in the mounting surface of the breaker part 1 of the insulating cylinder 3 and the mounting surface of the end plate 4 of the grounding tank 2, and the screw holes of the metal parts are used to secure the breaker part 1 and the breaker part 1 with bolts or the like. The end plate 4 is fixed.

Since this insulating cylinder 3 is sandwiched between the breaking part 1 of the high-voltage charging part and the end plate 4 at ground potential, its dielectric strength becomes a problem.

Therefore, high-voltage shields 7, 8 and ground shields 9, 10 are provided on the live part side and the ground potential side of the insulating tube 3, respectively, to alleviate the electric field. As shown in the figure, the voltage is disturbed in the part where there is no embedded metal fitting 5, the voltage per unit distance becomes high, the electric field stress becomes high in the A part and the B part, and there is a possibility that dielectric breakdown will occur in this part.

An object of the present invention is to alleviate electric field and mechanical stress concentration, improve dielectric strength, and obtain a mechanically strong insulating cylinder.

An embodiment of the present invention shown in the drawings will be described below.

In FIG. 2, the insulating cylinder 3 of the present invention is made by molding with epoxy resin, and a plurality of embedded metal fittings 5 and 6 and shield links 11 and 12 are integrally embedded in the mounting surface during this molding.

The relationship between the embedded metal parts 5 and 6 and the shield links 11 and 12 is such that they are divided into an appropriate number of pieces, for example four pieces, and embedded in the shield rings 11a, 11b, 11c and 11d, as shown in FIGS. 3 and 4. All or part of the eight pieces of hardware 5 are electrically and mechanically attached together by welding or the like.

When there are a large number of embedded metal fittings 5, the embedded metal fittings 5 at both ends of the shield link 11a are electrically connected to the ring 11a as shown in FIG.
It may be floated from a and molded into one piece.

FIG. 6 shows a case where the insulating cylinder 3 constructed in this manner is used as a support for the breaker part 1 of a circuit breaker in the same manner as in FIG. 1.

In the figure, since the shield links 11 and 12 are arranged in the direction in which the embedded metal fittings 5 and 6 are arranged, the conductive potential wire L does not collapse as shown in Fig. 1 even in areas where there is no embedded metal fitting 5. Therefore, the electrical potential distribution is the same, and there are no insulatingly weak parts.

Also, since the shield links 11 and 12 are divided,
Compared to a single shield ring, the mechanical stress caused by the difference in heat shrinkage between the epoxy resin and the shield ring can be alleviated, and a mechanically strong product can be obtained.

The number of divisions of the shield rings 11 and 120 can be selected as desired depending on the size of the insulating cylinder, and any shape such as a circle or a semicircle can be used.

As described above, according to the present invention, a shield ring is provided in the embedded metal fitting arranged on the mounting surface of the insulating cylinder and is divided in the direction of installation, and this shield ring can be inserted into any embedded metal fitting. By making the potential the same as that of the metal object, the equipotential line exhibits the same potential distribution regardless of the presence or absence of the embedded metal object, improving dielectric strength and easing mechanical stress, creating a mechanically strong insulating cylinder. can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a live part of a breaker using a conventional insulating tube, and FIG. 2 is a sectional view showing an insulating tube according to the present invention.
FIG. 3 is a plan view showing the relationship between the embedded metal fitting and the shield ring used in the present invention, FIG. 4 is a sectional view taken along the line A-A in FIG. 3, and FIG. FIG. 6 is a cross-sectional view showing a live portion of a circuit breaker using the insulating cylinder of the present invention. 3... Insulating tube, 5, 6... Embedded hardware,
11, 12...Shield ring, 1...
・Charging part, 2...Grounding tank, L...
conductive potential wire.

Claims (1)

[Claims] 1. In a case where a plurality of embedded metal fittings are embedded in the circumferential surface of the mounting surface of an insulating tube, a divided shield ring is embedded inside the insulating tube in the direction in which the embedded metal fittings are arranged. . An insulating cylinder, characterized in that only a required number of the embedded metal fittings are electrically connected to the shield ring.