SU913475A1 - Arc-extinguishing device - Google Patents

Description

The invention relates to electrical engineering, more specifically to arcing devices of high-voltage low-voltage ^ · switches.

Known arc extinguishing devices of transverse and counter-transverse blowing of high-voltage oil and oil switches, mounted inside insulating cylinders, located due to a reduction in the size of switches near transverse output channels or blow paths of arc extinguishing chambers, while arc extinguishing chambers do not have special exhaust channels [1).

The disadvantages of these arc-suppressing devices is that when the short-circuit currents are disconnected. the hot gases generated by the high temperature of the arc are ejected through the transverse exit channels and the blowing slits of the arc chamber. on insulating cylinders located in the immediate vicinity, burning them, which leads to deterioration of the insulation of the cylinders, as a result of which a breaker failure may occur.

Closest to the proposed

by technical essence are- <·

2

extinguishing devices for cross-section and counter-transverse blowing of oil-and-oil switches, fixed between insulating cylinders, having specially made turns in arcing chambers. coal exhaust channels that are a continuation of the transverse

, 0 of the blowing channels of the chamber and located parallel to the side surfaces of the insulating cylinders {21.

In such arc-suppressing devices, hot ionized gases are not emitted directly onto insulating cylinders, but along their lateral inner surface, which reduces the cylinder burnup when small currents are switched off. However, when disconnecting medium and especially large currents, these measures are insufficient.

The aim of the invention is to improve the reliability of the arcing device high-voltage

25 oil switches when the short-circuit current is disconnected

The goal is achieved by the fact that steak

exhaust channel at the exit of the channel from the side of the mounting chamber of the 30-cylinder cylinder is made with

3

913475

four

bevel in the opposite direction of the cylinder.

In addition, to improve the reliability of the arc-suppressing device, as well as to facilitate the exit of hot gases in the wall of the exhaust -5 channel, on the side opposite to the insulating cylinder fixing the camera, the bevel in the opposite direction of the cylinder is also made.

FIG. 1 shows an example of the execution of an arc extinguishing device of transverse blast, in which the wall of the exhaust channel at the exit of the channel from the side of the mounting chamber of the insulating cylinder is made with a bevel in the direction opposite to that of the mounting; in fig. 2 is the same, in which in the wall of the exhaust channel of the arcing chamber on the side opposite to the insulating cylinder fixing the camera, the bevel is made to the side opposite to the mounting arrangement.

The arcing device (Fig. 1 contains a fixed contact 1, a supporting cylinder · 2, an arcing chamber 3, an insulating cylinder 4 securing the camera, a moving contact 5. The arcing chamber 3 has a blowing channel 6, an exhaust channel 7 with a bevel 8 in the rear part oriented in the opposite side of the mounting location. The extinguishing chamber is filled with transformer oil 9.

The arcing device shown in FIG. 2, in the wall of the exhaust channel on the side opposite to the insulating cylinder fixing the chamber, the bevel 10 is made to the side opposite to the attachment location.

The principle of the arc-suppressing device, shown in figure 1, is that when the short-circuit breaker is disconnected Contacts 1 and 5 open and an electric arc lights up between them, which, under the action of high temperature, evaporates part of the oil 9, which is under the arc chute 3.

Bubble formed in the subchamber space through the blower 6 and exhaust 7 channels

breaks into the space above the camera. When blowing arc in the blast channel 6, it goes out.

The bevel in the exhaust channel allows directing hot gases moving at high speed from the arc chamber to the side opposite to where the inner surface of the insulating cylinder 4 is located and to protect it from burning and destruction.

The operation of the arc suppression device shown in FIG. 2, is similar to the described operation of the Arc-suppressing device (Fig. 1). At the same time, the bevel 15 U facilitates the exit of hot gases from the arcing chamber away from the inner surface of the insulating cylinder fixing the chamber.

The use of this invention 20 in the oil and oil switches for large and medium currents can significantly increase the reliability of their work. . ,

25

Claims (2)

Claim 1. Arc extinguishing device for cross-section or counter-transverse blowing of high-voltage oil-and-oil 30 switches, contained in the arc chamber, at least one exhaust channel, made parallel to the side surface of the insulating cylinder, fixing the chamber, characterized in that, in order to increase the reliability of the arc damper, the wall of the exhaust channel at the outlet from the specified cylinder is bevelled the opposite side of the cylinder. 2. The device according to claim 1, characterized by the fact that in the wall of the exhaust channel from the side opposite the said cylinder, 45 is also made the bevel in the direction opposite to the location of the cylinder.