JPS5857046B2 - gas insulated electrical equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas-insulated electrical device in which a tank contains an insulating gas such as SF6 gas, as well as electrical conductors and live parts of various electrical devices, and in particular, to prevent foreign matter from entering the tank. This relates to the captured trap device.

Generally, in this type of gas-insulated electrical equipment, foreign matter may get mixed into the tank or be generated for some reason, but at this time, the floating blade acts on the foreign matter in the tank due to the electrostatic force caused by the strength of the electric field. If this force exceeds the gravity of the foreign object itself, the foreign object will float, causing a phenomenon in which the tank and the live part flash through the floating foreign object, causing a reduction in the dielectric strength of the device.

Therefore, a trap device for trapping foreign matter is usually provided in the tank, and a typical conventional trap device is shown in FIG.

That is, in FIG. 1, 1 is a metal tank which accommodates a high potential conductor 2 serving as a live part together with an insulating gas such as SF6 gas, and is normally grounded. A trap device consisting of a metal plate member arranged and held at the same potential as the tank 1 and having a plurality of slits 31 arranged in parallel in the circumferential direction; 4 is a foreign object such as metal powder mixed into the tank 1; .

In the conventional device configured as described above, the foreign matter 4 is captured through the slit 31 in a space between the bottom of the tank 1 and the trap device 3 in which the electric field is sufficiently relaxed.

However, since there is a height difference between the edge extending in the circumferential direction of the tank 1 of the trap device 3 and the inner circumferential surface of the tank, there is a slight difference in height on the inner circumferential surface of the tank 1 facing near this edge. A weak electric field area was generated, the movement of the foreign matter 4 was stopped, and some foreign matter accumulated and accumulated in this area.

The present invention aims to eliminate such drawbacks of the conventional devices, and provides a gas insulated electrical device having a trap device configured to efficiently trap foreign substances that cause deterioration in the insulation of electrical equipment. It is something.

An embodiment of the present invention will be described below with reference to FIG.

. That is, in FIG. 2, 1, 2, and 4 indicate the same or equivalent parts as shown in FIG.

Reference numeral 5 denotes a trap device main body made of a metal plate member, which is disposed on the inner surface of the lower part of the tank 1 with a gap S therebetween, is held at the same potential as the tank 1, and has slits 52 arranged in parallel in the circumferential direction; This trap device has an auxiliary member 53 made of an insulator that is attached to the end of the trap device and extends to a position where the weak electric field generated by the trap device main body 51 disappears.

With this configuration, although some electric field distortion occurs near the auxiliary member 53 of the trap device 5, this is relatively small and does not affect the movement of the foreign object 4 much.

Under these circumstances, when the foreign object 4 approaches the auxiliary member 53, without slowing down its speed, it either goes under the auxiliary member 53 as shown by the solid line arrow or climbs upwards as shown by the dotted line arrow. It moves and approaches the trap device main body 51.

The foreign object 4 that has climbed up is caught in the slit 5 of the trap device main body 51.
2, some of them are trapped in the space formed between the trap device 5 and the tank 1, and some of them that go down are stored and deposited near the edge of the trap device main body 51.

In this state, the foreign object 4 that has come to rest in this way is
When a short-term voltage such as a surge is applied, the foreign object 4 under the auxiliary member 53 rises again and tries to move, but since the movement is blocked by the auxiliary member 53, the foreign object 4 jumps into the tank 1 again. There is no risk of adverse effects on the output, and a drop in pressure resistance of the entire device is prevented.

As described above, the gas-insulated electric device according to the present invention has an N trap device arranged at a gap on the inner surface of a tank containing an insulating gas and a charging part, and this trap device is attached to a main body and an end of this main body. The device is constructed with an auxiliary member made of an insulator, and can trap foreign matter in the space formed between the trap device and the tank, thereby improving the pressure resistance characteristics of the device.

[Brief explanation of drawings]

Figure 1 is a sectional view of the main parts of a conventional gas-insulated electric device of this type.
FIG. 2 is a sectional view of a main part showing an embodiment of the present invention. 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, and 53 is an auxiliary member. Note that the same reference numerals in the drawings indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. A tank that accommodates a charging part together with an insulating gas, a trap device main body disposed on the inner surface of the tank with a gap in between, and an insulator disposed at an end of the trap device main body. A gas insulated electrical device having a trap device including an auxiliary member. 2. The gas insulated electrical device according to claim 1, wherein the trap device main body is held at the same potential as the tank. 3. The gas insulated electric device according to claim 1 or 2, wherein the auxiliary members are attached to both ends of the trap device main body.