RU78982U1 - DEVICE FOR INDEPENDENT MAGNETIC BLOW ON DC MAGNETS OF DC SWITCH - Google Patents

Abstract

The device of independent magnetic blasting on permanent magnets of a DC circuit breaker, consisting of permanent magnets and a magnetic circuit, characterized in that it is additionally equipped with U-shaped horns on each electric pole, one pole of the magnetic circuit is introduced between the forked parts of the horns of each electric pole, the second pole of the magnetic circuit is located in the lower and lateral parts of the U-shaped horns of each electric pole.

Description

The utility model relates to electrical engineering, namely to the component parts of switching equipment, to devices of direct current switches.

Designs of magnetic blasting of DC switches are known from the following sources:

1. Bron, O.B. Electric arc in control apparatuses, M. - L .: Gosenergoizdat, 1954, pp. 214-222.364-371;

2 Golubev A. I. High-speed circuit breakers, M. - L .: "Energy", 1964, pp. 136-147.

The above sources describe various types of magnetic blast devices used in DC circuit breakers.

Sources 1 and 2 show the design of direct current circuit breakers having a sequential (serial) magnetic blast device operating from the main circuit current of the circuit breaker. A sequential (serial) magnetic blast device consists of a winding connected in series in the main circuit of the switch and a magnetic circuit. The device serial (serial) magnetic blast works as follows. The current of the main circuit of the switch, passing through the winding, creates a magnetic flux in the magnetic circuit, which is sent to the arc burning zone. When the DC circuit breaker is turned off, its contacts diverge, an electric arc is ignited between them, which, under the influence of magnetic flux from the magnetic circuit, is blown out at a given direction from the intercontact space at a high speed. A disadvantage of the known sequential arrester of a sequential (serial) magnetic blast is the difficulty of blowing the arc with a small current, since with a small value of the main current the magnetic flux generated

a sequential (serial) magnetic blast device is so insignificant that under its influence the electric arc cannot move from the contact gap and burns between the contacts, which can lead to the destruction of the circuit breaker design.

The source 1 also describes a direct current circuit breaker device with a parallel magnetic blast device. A parallel magnetic blast device consists of a control device, a winding and a magnetic circuit, and operates as follows. When the DC circuit breaker trips, its contacts diverge, and an electric arc is ignited between them. The control device at this moment determines the direction of the current in the main circuit of the switch, and supplies the coil with the necessary voltage of the required polarity from an additional source of electricity, or from an additional break in the main circuit of the switch. The coil creates a magnetic flux in the magnetic circuit, which is directed by the magnetic circuit into the arc burning zone. An arc under the influence of magnetic flux is blown out of the intercontact space with a high speed. A disadvantage of the known device of parallel magnetic blasting is the presence of a complex control device, which must include a current sensor to determine the direction of current in the main circuit of the circuit breaker, or the presence of an additional break in the main circuit, which requires additional complication of the mechanical part of the circuit breaker.

The source 1 also describes a direct current circuit breaker device with an independent permanent magnet magnetic blast device. The device of an independent magnetic blast on permanent magnets consists of permanent magnets and a magnetic circuit. The device of independent magnetic blasting with permanent magnets works as follows. Permanent magnets create a magnetic flux in the magnetic circuit, which is directed by the magnetic circuit into the arc burning zone. When the contacts of the DC switch are opened between them, an electric arc is ignited, which, under the influence of magnetic flux from the magnetic circuit, moves at high speed from the intercontact space. Known disadvantage

device independent magnetic blasting with permanent magnets is the inability to blow the electric arc in the right direction with a reverse current. The electrodynamic forces in the opposite direction of the current will move the electric arc in the opposite direction from the desired direction, while the arc can get into the DC circuit breaker, thereby causing its breakdown.

The closest in technical essence to the patented device of independent magnetic blasting with permanent magnets should be considered a device of independent magnetic blasting with permanent magnets described in source 1.

A useful model solves the problem of reliable extinction of an electric arc in a given area of an arcing device.

The technical result, which is achieved by a useful model, is to ensure the movement of the arc in a given direction.

This is achieved by the fact that horns from each electric pole, having a U-shape, are additionally introduced into the composition of an independent magnetic blast device with permanent magnets at source 1. Between the bifurcated parts of the horns is additionally introduced the pole of the magnetic circuit of the magnetic blast, the second pole of the magnetic circuit is placed in the lower and side parts of the U-shaped horns of each electrical contact.

The introduction of U-shaped horns and a different arrangement of the poles of the magnetic circuit below, on the side and between the bifurcated part of the horns made it possible to obtain an independent magnetic blast device with permanent magnets, blowing a direct current arc of any direction in a given direction.

The utility model is illustrated in figure 1, which shows a sketch of a patented device for independent magnetic blasting with permanent magnets in composition with a contact node and an arcing device of a DC switch. The utility model is also illustrated in FIG. 2, which shows an isometric sketch of a patented permanent magnetic blast device with permanent magnets in combination with a contact node. Independent magnetic device

permanent magnet blasting with a contact node and an arcing device of a DC circuit breaker contains a fixed contact 1, a movable contact 2, U-shaped horns of electric poles 3 (and 4, an arcing device 5, permanent magnets 6, poles 7 and 8 of the magnetic blast magnetic circuit .

The device of independent magnetic blasting with permanent magnets in works as follows. Permanent magnets 6 with poles 7 and 8 of the magnetic blast magnetic circuit create a magnetic flux in the divergence zone of the fixed contact 1 and the movable contact 2, as well as between the U-shaped horns of adjacent electric poles. If contacts 1 and 2 diverge between them, an electric arc is ignited. Due to the fact that the electric arc is a conductor of electric current, under the influence of magnetic flux from the poles of the magnetic circuit of the magnetic blast 7 and 8, the arc moves with high speed along the horns 3 and 4, along the right or left side of the U-shaped horns of the opposite electric poles of figure 1 (depending on the direction of the arc current), and then blown into the arcing device 5. The calculated picture of the magnetic potentials along which the electric arc will move, which is formed between the U-shaped horns with adjacent electric poles and between the poles 7 and 8 of the magnetic circuit of the magnetic blast, shown in Fig.3.

Thus, a device of independent magnetic blasting with permanent magnets of a DC circuit breaker has been created, blowing an electric arc in a given direction at an arc current of any direction and providing reliable arc extinction in an arcing device.

Claims (1)

The device of an independent magnetic blast on the permanent magnets of the DC circuit breaker, consisting of permanent magnets and a magnetic circuit, characterized in that it additionally includes U-shaped horns at each electric pole, one pole of the magnetic circuit is introduced between the forked parts of the horns of each electric pole, the second pole of the magnetic circuit is located in the lower and lateral parts of the U-shaped horns of each electric pole.