JPS6110410Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a gas-insulated electrical device that houses an electrical device or a live part such as a high-potential conductor together with an insulating gas such as SF ₆ gas in a tank, especially for capturing foreign objects that have entered the tank. This relates to a trap device.

Generally, in this type of gas insulated electrical equipment,
There are cases where foreign matter gets mixed in or is generated in the tank for some reason.

At this time, a levitation force acts on the foreign object in the tank due to the electrostatic force caused by the strength of the electric field, and if this force exceeds the foreign object's own gravity, the foreign object levitates and charges with the tank via the floating foreign object. There is a possibility that the parts may flash, reducing the dielectric strength of the device.
Therefore, a trap device is usually provided in the tank to catch the foreign matter, and a typical conventional trap device is shown in FIG.

That is, in FIG. 1, 1 is a metal tank which houses a high potential conductor 2 which serves as a live part together with an insulating gas such as SF ₆ gas, and which is normally grounded, and 3 is a tank 1.
Tank 1
A trap device 4 is a metal plate member held at the same potential as the tank 1 and has a plurality of slits 31 arranged in parallel in the circumferential direction of the tank 1;

In the conventional device configured in this way, foreign matter 4
is captured through the slit 31 in a space between the bottom of the tank 1 and the trap device 3 where the electric field is sufficiently relaxed. However, there is a difference in altitude between the trap device 3 and the inner peripheral surface of the tank 1, and the trap device 3
Since a slightly weak electric field was generated on the inner peripheral surface of the tank near the end of the tank, it took a relatively long time to capture large foreign objects.

This invention was made with attention to this point, and one embodiment of this invention will be described below based on FIGS. 2 to 4.

That is, in FIGS. 2 to 4, 1, 2, and 4 indicate the same or equivalent parts as shown in FIG. 1. 5
is arranged on the inner surface of the lower part of the tank 1 with a gap between the trap device main body 51 and the tank, which are made of a metal member that is held at the same potential as the tank 1 and has slits 52 arranged parallel to the circumferential direction of the tank 1. From an insulator attached to the entire circumference of the end of the main body 51 so as to have the same height as the main body 51 with respect to the inner circumferential surface and extend to a position where the weak electric field generated by the trap device 5 disappears. This trap device has an auxiliary member 53 and a support member 54 attached to the main body 51 and fixed to the inner peripheral surface of the tank 1 with adhesive or the like.

With this configuration, the auxiliary member 53
Although some electric field distortion occurs in the vicinity of , this is relatively small and does not affect the movement of the foreign object 4 much. When the foreign object 4 approaches the trap device 5 under these circumstances, it climbs onto the auxiliary member 53 as shown by the solid line arrow without slowing down, but the auxiliary member 53 climbs up as shown by the dotted line arrow. 53 and approach the trap device 5. The foreign matter 4 that has climbed onto the trap device 5 is caught in the space between the trap device 5 and the tank 1 through the slit 52 of the trap device 5, and the foreign matter 4 that has climbed below the trap device 5 is captured by the auxiliary member 53. From the space between the trap device 5 and the tank 1, it is stored near the end of the trap device 5 and becomes stationary.

If a short-term voltage such as a surge appears in this state, the foreign matter 4 accumulated at the end of the trap device may move slightly in the conventional trap device, but in the device of this invention, the foreign matter 4 accumulated at the end of the trap device may move slightly. Since the movement of the foreign matter 4 is blocked, there is no risk that the foreign matter 4 will jump back into the tank 1 and cause any adverse effects.
Furthermore, this trap device 5 has the advantage that it can be easily attached to any position within the tank 1 via the support member 54 using adhesive or the like, and since the height of the support member 54 can be changed, the height of the trap device can be easily adjusted. can change to

As mentioned above, the gas-insulated electric device according to this invention has a trap device arranged at a gap on the inner surface of the tank containing the insulating gas and the live parts, and this trap device is placed around the main body and the entire circumference of the end of the main body. It is composed of an auxiliary member made of an attached insulator, and completely traps foreign matter that has entered the tank in the space formed between the trap device and the tank, improving the pressure resistance characteristics of the device. Can be done.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a conventional gas-insulated electric device of this type, and Figs. 2 to 4 all show an embodiment of this invention. Fig. 2 is a cross-sectional view, and Fig. 3 is a cross-sectional view. FIG. 2 is a sectional view taken along the line, and FIG. 4 is a perspective view. In the figure, 1 is a tank, 2 is a high potential conductor, 3 is a trap device, 4 is a foreign object, 5 is a trap device, 51 is a trap device main body, 52 is a slit, 53 is an auxiliary member, and 54 is a support member. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A tank containing insulating gas and a live part, a trap body disposed on the inner surface of the tank with a gap between them, and a trap body disposed around the entire circumference of the end of the trap body. gas insulated electrical equipment having a trapping device having an auxiliary member made of an insulator. (2) The gas-insulated electric device according to claim 1, wherein the trap device main body is maintained at the same potential as the tank. (3) Claims 1 or 2 of the utility model registration claim in which the trap device body is provided with a slit
Gas insulated electrical equipment as described in Section.