JPS5838758Y2 - gas insulated equipment - Google Patents

Description

[Detailed description of the invention] Extra high voltage is applied to gas insulated equipment such as air pipe cables pressurized with SF6 gas and sealed conductor busbars connecting circuit breakers and disconnectors.

Despite sufficient care during manufacturing and installation, very small amounts of metal or semiconducting particles may remain inside, and even during power transmission, such particles may be generated due to local discharges. The presence of such particles in pipes can lead to accidents.

Therefore, a particle trap is installed in a space insulated by gas, and measures are taken to capture the particles moving in the conduit during power transmission and hold them in a place where they are less affected by the electric field. .

FIG. 1 shows a conventional example of a conduit aerial cable for comparison with the present invention.

In the figure, a central conductor 1 is supported in a sheath 2 by a spacer (not shown), and a particle trapping device with a cylindrical shape and many holes on the surface is formed at the periphery of an annular spacer 3 fixed to the conductor 1. An electrode 4 is supported, and a particle trap 5 is formed by the sheath 2 and the particle trap electrode 4 .

The particle trapping electrode 4 needs to be electrically at the same potential as the sheath 2, so a conductive leaf spring 6 is welded to the outside of the particle trapping electrode 4, and the other end is in contact with the inside of the sheath.

When a temperature change occurs during power transmission and thermal expansion and contraction occurs in the conductor 1, the particle trapping electrode 4 fixed to the conductor 1 is displaced in accordance with the displacement of the conductor.

The leaf spring 6 then slides inside the sheath 2.

When such sliding occurs, fine metal particles may be generated due to friction, but as can be understood from the above, the presence of fine metal particles is not desirable in this type of gas-insulated equipment, and sliding It is presumed that the electrical connection between the leaf spring 6 and the sheath 2 will also deteriorate.

The present invention provides a new gas insulated device that eliminates the above-mentioned sliding parts between metals such as the sheath and the leaf spring.

FIG. 2 shows an embodiment of a conduit aerial cable according to the present invention, and shows a part of its longitudinal section.

The basic structure of the hollow conductor 1 made of aluminum or copper and the sheath 2 made of stainless steel or aluminum is the same as the conventional one.

A cylindrical particle trapping electrode 4 made of aluminum or stainless steel and having a large number of holes on its surface is disposed inside the sheath 2, facing the inside of the sheath, and together form a particle trap 5.

The particle trapping electrode 4 is mechanically fixed to the sheath 2 by a fixing part 7 by welding or the like and electrically connected.

An annular or radial insulating spacer 8 made of epoxy liquid crystal and having a metal sleeve 9 integrally fixed to its center is attached inside the particle trapping electrode 4 at its periphery.

The inner hole of the sleeve 9 is provided with a groove 11 into which a cylindrical sliding member 10 made of tetrafluoride resin is fitted, and an end groove 13 into which a conductive spout 12 is attached.

After fitting the sliding member 10 into the inner hole of the sleeve 9 and welding one end of the conductive spring into the end groove 13, the conductor 1 is inserted into the sleeve 9, and the other end of the spring 12 is inserted at a predetermined position. Weld on conductor.

The conductor 1 contacts only the sleeve 9 and the cylindrical sliding member 10 made of tetrafluoride resin, and electrical connection is made by the spring 12.

Therefore, when thermal expansion and contraction occurs in the conductor 1, the sleeve 9 supported via the fixed particle trapping electrode 4 moves its sliding member 1.
0 allows displacement of the conductor 1.

Tetrafluoride resin has lubricating properties and is suitable as a sliding member, but there is almost no possibility that fine particles will be generated in friction between such a lubricating resin and a metal surface.

The spring 13 is used to equalize the potentials so that no potential occurs between the sleeve 9 and the conductor.
When the conductor 1 is displaced, the electrical connection is maintained by the expansion and contraction of the spring.

As explained above, in the present invention, sliding between metal surfaces can be avoided, and in terms of structure, local loads are not applied to the conductor as in the conventional one shown in Fig. 1.
In other words, it is a structure that serves both the support of the conductor and the arrangement of the particle trapping electrode, and the effect of implementing it is extremely large.

In the example, a single-core duct aerial cable was explained, but gas-insulated equipment such as multi-core duct aerial cables or sealed bus bars can also be used by slightly changing the shapes of insulating spacers, particle-trapping electrodes, etc. , the present invention can be implemented.

[Brief explanation of drawings]

FIG. 1 shows a cross section of a conventional example. Figure 2 shows a cross section of one embodiment of the present invention, where 1 is a conductor and 2 is a conductor.
is a sheath, 4 is a particle trapping electrode, 5 is a particle trap, 7 is a fixed part, 8 is an annular or radial spacer, 9 is a sleeve, 1
1 is a groove, 10 is a cylindrical sliding member made of tetrafluoride resin, 1
Reference numeral 2 indicates a spring, and reference numeral 13 indicates an end groove provided in the inner hole of the sleeve.

Claims (1)

[Scope of utility model registration request] A particle trapping electrode is mechanically fixed to the inside of the sheath by the sheath and a fixing part, and electrically connected, an insulating spacer having a metal sleeve integrally fixed to the particle trapping electrode is fixed, and the insulating spacer is fitted into the sleeve. A gas insulated device in which a conductor is mechanically supported and electrically connected via an inserted sliding member and a fixed conductive member.