RU2366022C1 - Arc-extinguishing system - Google Patents

Abstract

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering, particularly to a protective switching apparatus, and can be used in protective contact switching apparatus. The arc-extinguishing system has a section, made from a set of arc-extinguishing and spark-extinguishing plates, insulated from each other by a set of insulating plates. The arc-extinguishing plates have a circular shape, have a groove in form of a sector with an acute angle and can rotate about their axis.

EFFECT: increased cooling rate of the arc and its effective extinguishing with reduction of the size of the arc-extinguishing system.

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Description

The invention relates to electrical engineering, in particular to protective switching equipment, and can be used as part of protective contact switching devices. In DC circuit breakers, arcing systems are used to increase the breaking capacity. Such devices are known from the following sources:

1. A.I. Golubev. High-speed circuit breakers. - M. - L .: Energy, 1964, p.125-150;

2. O.B. Bron. Electric arc in control devices, part 2. - M: Gosenergoizdat, 1954, p. 270-271;

3. Muradov E.Sh., Shipitsyn VV, Seredko R.E. Automatic high-speed switches for trolley buses, Yekaterinburg: Polygraphist, 2005, p.118, fig. 41;

4. Patent RU No. 2028683, H01H 9/30, 1991;

5. Patent RU No. 73540, H01H 9/30, 2008

The closest analogue may be the interrupter chamber according to the third source. This chamber contains a housing in which a set of arcing and spark extinguishing plates is placed, and a block of insulating plates is located between them. Such a camera provides reliable disconnection of short-circuit currents, but does not provide a complete shutdown of small constant inductive currents, which can cause overlapping of the intercontact space. This is because in the prototype, heat removal from the arc, on which reliable disconnection of small constant inductive currents depends, is difficult, since ionized gases must pass through the deionization lattice and reach a set of spark-extinguishing plates, that is, the path of movement of ionized gases is large.

The present invention improves the efficiency of the suppression due to the transition of part of the electric energy of the arc into the kinetic energy of the arcing plates.

The technical result of the invention lies in the fact that the thermal resistance of the heat sink from the gases ionized by the arc decreases, the cooling rate of the arc increases, and its extinction efficiency increases.

The invention consists in the following. Arc-suppression plates made in the form of a circle, under the action of the arc energy arising from the opening of the circuit breaker contacts, develop kinetic energy (rotate around its axis). As a result, part of the released electric energy of the arc is spent on the movement (rotation) of the arcing plates, and another part of the arc energy is released in the form of thermal resistance. As a result, the cooling intensity of the arc increases and the damping efficiency of small constant inductive currents increases, that is, the claimed technical result is provided. In addition, by reducing the heat emission of the arc, the dimensions of the patented arcing system can be significantly reduced.

The extinguishing system is shown in figure 1 and consists of a section 1 made of arc-resistant material. In the section, there is a block of arcing plates 2 made in the form of a circle with a groove in the form of a sector with an acute angle and with the possibility of rotation of each such plate around axis 3, and a block of spark extinguishing plates 4. The blocks of arcing and spark extinguishing plates are isolated between themselves by a block of insulating plates 5.

To explain the operation of the arcing system, figure 2 conventionally shows the contacts 6 of the switch, electrically connected to the arcing horns 7 of the same switch.

The operation of the arcing system when disconnecting the short circuit current occurs as follows.

When the contacts 6 of the switch are opened, an electric arc arises, which moves (for example, under the influence of the magnetic field of the magnetic blower coil of the switch - not shown in the figures), first through contacts 6, and then along the arcing horns 7. The upward movement of the arc is very intense. And then the electric arc goes into the section of the arcing system on the block of arcing plates 2, between which the arc is divided into a series of series-connected short arcs. In this case, a large number of near-electrode voltage drops occur, which add up to each other and create a general voltage drop on the arc, a larger mains voltage is a necessary condition for extinguishing a DC arc. In addition, part of the arc energy is spent on the movement of the arcing plates 2, which under the action of the arc energy begin to rotate around axis 3, while increasing the length of the arc and provides additional cooling. This contributes to a significant heat removal from the arc channels and the active deionization of ionized air particles.

With such an effective heat sink and deionization of the residual arc shaft, the latter cools and goes out.

Thus, through the use of a set of arcing plates made in the form of a circle with a groove made in the form of a sector with an acute angle, the thermal resistance of the heat sink from the gases ionized by the arc decreases, the cooling intensity of the arc increases, and the efficiency of quenching short circuit currents increases.

Claims (1)

An arcing system containing a section made of a set of arcing and spark extinguishing plates isolated between each other by a set of insulating plates, characterized in that the arcing plates are made in the form of a circle, with a groove in the form of a sector with an acute angle and with the possibility of rotation around its axis.

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