SU43383A1 - Oil circuit breaker - Google Patents

Description

In HIGH-VOLTAGE oil switches, when the tank is opened, a large amount of gas is released, which flings oil upward, which squeezes the air under the cover, and strong pressure develops in the tank. In addition, a secondary explosion of gases is possible if they come into contact with a spark, for example, from current transformer wires, usually located in the oil cap near the contact terminal. Regardless of the ability of the tank to resist the strength of internal explosions, the tank-supported insulating sleeves, usually made of porcelain or other ceramic material, can be subject to significant stresses and collapse due to vibrations in the cover.

The purpose of the present invention is, on the one hand, such a method of mounting the insulating sleeves in the lid of the oil switch tank, which would weaken or eliminate the possibility of transfer of shocks from the tank to the sleeve and, on the other hand, prevent the above-mentioned secondary explosion by isolating the current transformer from the gas space at the top of the tank.

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The drawing shows a part of an oil switch of the usual type, closed in a tank /, filled with oil 2, into which a movable contact 5 entering the damping chamber 4 is immersed. A contact terminal not shown in the drawing, supported by an insulating sleeve b from porcelain, passes through the cover 5 or similar material. At point 7, the sleeve is bonded, for example with cement, to an annular flange 5 connected by bolts 9 to a supporting part 10 made in the form of a plate equipped with a flange 11. An annular part 2 is attached to the lid 5, with respect to which part 10 can move somewhat. For this purpose, a gasket 13 made of an elastic material, such as rubber, cork or the like, is placed between parts 10 and 12, so that there is no metallic contact between them. Thus, the sleeve can move with respect to the cover, and the movement can be axial and swinging. As a result, the stresses due to the above-mentioned strong pressure are significantly reduced. Part W is fixed in the cover 5 by bolts 14 and metal linings, separated from part W by sleeves H

from elastic material. Due to this, the shocks are not transmitted to part 10, and at the same time the sleeve is able to move.

Between the flanges 11 is placed a bushing current transformer 17. The lower part of the transformer casing is closed by a plate 18 connected to the bottom edge by a flange 11 (bolts 19) and to a metal ring 20 fastened with cement 7 to the sleeve b. A seal 21 is laid between the plate 18 and the transformer winding. A conventional grounding screen 22 is connected to the ring 20 by tapping. The transformer leads that are not shown in the drawing come out of the cap through tube 23. Thus, the sleeve transformer is completely isolated from the inside of the tank, thereby eliminating the possibility igniting a spark from transformer wires of gases that accumulate in the upper part of the tank by opening the switch contacts. In the event of a strong internal explosion in the tank, the push that could be transmitted to sleeve b is largely absorbed by the elastic parts 13 and 16, which protect the sleeve from mechanical damage.

The subject of the patent.

Claims (2)

1. An oil switch, in which an elastic gasket is applied between the insulating lead and the casing, characterized by the use of a shock absorbing device located between the tank cover and the insulating sleeve and consisting of a supporting device attached to the sleeve. a part 10, from an elastic gasket 13 between the supporting part 10 and the lid and from the tool for the elastic connection of the supporting part 10 to the lid allowing the sleeve to move relative to the lid. 2. In the oil switch according to claim 1 with a bushing current transformer the use of a device that hermetically isolates the transformer from the gases generated in the tank.