RU74739U1 - ARC DEVICE - Google Patents

Abstract

The utility model relates to electrical engineering, in particular to DC circuit breakers. The technical result of the utility model is to increase the efficiency of arc extinction by an arcing device by eliminating the release of a conductive channel beyond the boundaries of this device. The arcing device consists of two sections located in parallel and isolated by a screen. The sections are electrically connected using a system of horns - two interrupter and one additional horns, which provide a serial connection of sections. New is that each section contains an arcing block consisting of a set of arcing and spark extinguishing plates, isolated between each other by a set of insulating plates. Thanks to the use of arcing blocks in sections of the arcing device, it was possible to increase the intensity of cooling of the arc and to exclude the discharge of the arc beyond the limits of the arcing device. 1. p. Fs, 1. FIG.

Description

The proposed utility model relates to electrical engineering, in particular to DC circuit breakers. In DC circuit breakers, arcing devices are used to increase the breaking capacity. Such devices are known from the following sources: A.I. Golubev. High-speed circuit breakers. - M. - L .: Energy, 1964, pp. 125-150; OBBron Electric arc in control devices, part 2. - M.: Gosenergoizdat, 1954, p. 270-271; RU patent No. 2028683 H01H 9/30, 1991

As the closest analogue to the patented device should be considered the arcing chamber given in the following literature: O.B. Bron Electric arc in the control apparatus of Part 2. - M.: Gosenergoizdat, 1954, p. 270-271. This chamber contains longitudinal slots placed in parallel and separated by insulating partitions. In the lower part of the chamber there is a cavity in which the contacts of the apparatus and the main arcing horns are located, each slot is electrically connected to each other by means of additional horns.

Due to this design of the chamber, ensuring that the arc enters each of the slots, its extension and the series connection of the arcs in each slit, their simultaneous extinction is ensured. The advantage of a slit chamber with several parallel longitudinal slots is to reduce the size of the chamber by almost half. The disadvantage of this chamber is that in the last stage of combustion, the arc is in the free upper cavity of the chamber, where it burns until it is completely extinguished. At this stage, the length of the arcs stabilizes and remains unchanged, which may

lead to the occurrence of current in the remains of burning air ejected outside the chamber and, as a result, the circuit breaker is closed from above along the exhaust path.

The proposed utility model allows to exclude the overlap of the switch on top of the arcing chamber, which increases the efficiency of the arcing. In addition, the use of a patentable arrester allows to reduce its dimensions.

The technical result of the utility model is to increase the efficiency of arc extinction with an arcing device, by eliminating the discharge of the conductive channel outside the chamber and reducing the dimensions of the device.

The essence of the utility model is as follows. In the upper part of the arcing device, a set of arcing and spark extinguishing plates is additionally introduced, which contribute to the deionization of the arc channel. These plates serve as recombination centers, between which ionized particles of exhaust from the chamber pass. As a result, the cooling intensity of the arc increases and the quenching efficiency increases, that is, the claimed technical result is provided.

The extinguishing device is shown in figure 1 and consists of two sections 1 and 2 located in parallel. The sections are isolated between each other by a screen 3. The device contains a system of horns that provide a serial connection of sections - arcing horns 4, 5 and an additional horn 6 - electrically interconnected. Each section contains an extinguishing unit with a set of arcing 7 and a set of spark extinguishing 8 plates. The set of arcing plates is isolated using insulating plates 9 from a set of spark arrester plates.

The operation of the arrester when disconnecting the short circuit current is as follows.

When the contacts of the circuit breaker 10, 11 are opened, an electric arc appears, which moves first along the contacts, and then along the arcing horns 4, 5. Next, the arc goes to an additional horn 6 and is divided into two consecutive arcs that fall into different sections of the arcing device. The movement of two arcs upwards is very intense, their paths are almost the same. Stretching and moving upwards, the arcs move along the walls of the partition. This contributes to the removal of heat from the channels of the arcs and the active deionization of ionized air particles. In the upper cavity of the arcing device, the remains of the arc barrel are transferred to the metal arcing plates 7, between which the arc is divided into a series of short arcs connected in series. In this case, a large number of near-electrode voltage drops occur, which add up to each other and create a general voltage drop across the arc greater than the mains voltage - a necessary condition for the extinction of a DC arc. An effective heat removal of the heated gases and deionization of the residual arc shaft occur, as a result of which the arc cools and goes out.

Thus, due to the use of sets of arcing and spark-extinguishing plates in each section of the arcing device, the cooling rate of the arc increases, which contributes to the effective suppression of short-circuit currents and elimination of arc discharge outside the device.

Claims (1)

An arcing device containing two parallel sections, electrically connected using a system of horns made of two arcing horns and an additional horn, the sections being isolated by a screen, characterized in that each section contains a set of arcing and spark extinguishing plates isolated from each other by a set of insulating plates and located at the top of the device.