RU1791870C - High-speed circuit breaker - Google Patents

Abstract

Use: electrical appliance. The inventive switch contains a fixed 1 and movable 2 contacts, an electromagnet consisting of a frame 3 with pole pieces 4, 5 and a holding coil 6 located on it, core 7, which is moved to the pole pieces 4 and 5. When the drive 19 is turned on, the lower the end of the lever 8 is pressed against the lever 16, and a gap remains between the contacts 1 and 2. After the drive 19 has been disconnected, the contact lever 8 under the action of the spring 18 will rotate around the axis 15 and the contacts 1 and 2 will be closed. The armature 7 is held in an attracted position by a part of the magnetic flux from the coil 6. The main current of the switch, passing through the second terminal 14 of the coil 12 through the window 11, creates an additional magnetizing force in the cortex 7. 2 silt, 1 ate C

Description

The invention relates to the field of electrical engineering. It can be used in electrical installations to protect the electrical equipment of industrial facilities, traction substations and electrified vehicles.

A high-speed circuit breaker is known with an eKfTfot rWrffftiM holding device consisting of; from a frame with two pole tips and the Holding and current coils located on it and a core located above the pole tips with the possibility of movement, for example, by supporting the spring to the stop. The holding coil is connected to a constant current source, and the main current of the protected circuit passes through the current coil. The polarity of the switching on of the coils is such that the magnetizing forces from the currents of these coils are directed opposite each other, which contributes, with a rapid increase in the main current, the induction of current in the holding coil, which slows down the flow in the core.

A fast switch is also known in which the fraction of current induced in the holding coil is reduced by the use of a magnetic shunt mounted with a gap between the pole pieces. At this switch, the role of the current coil is played by a bus that passes through a window formed by a magnetic shunt and core.

An even greater shunting effect is exerted by the switch, in which the core with the current coil placed on it, the ends of which pass through the window formed by the core and core, plays the role of a magnetic shunt.

As a prototype, a high-speed switch containing contacts, an electromagnet consisting of a frame with two pole pieces and a coil located on it, a core located above the pole pieces and connected to the contact lever with the possibility of displacement to the stop, of the core installed between the pole pieces, was selected and forming with a window a current coil located on the core.

At this switch, an increase in the main current in the current coil leads to a rapid displacement of the magnetic flux from the core without the formation of a counter magnetizing force in the frame. However, to obtain the setpoint (the magnitude of the main current causing the circuit breaker to operate), a large consumption of active materials and energy is required to power the holding coil.

The aim of the invention. Is to reduce the weight of active materials and energy consumption

circuit breaker.

The goal is achieved in that in a high-speed circuit breaker containing contacts, an electromagnet consisting of a frame with two pole

0 tips and a coil located on it, a core located above the pole pieces and connected to the contact lever with the ability to move to the stop, a core inserted between the pole pieces and forming a window with a frame, a current coil placed on the core, the ends of the current coil passage t through the window formed by the core and core and exits on opposite sides of the window.

A distinctive feature of the proposed high-speed switch is that the ends of the current coil pass through a window formed by

5 and with the core and exit on opposite sides of the window. And this reduces the weight of the active materials and energy consumption by reducing the ampere turns of the holding coil. The reduction of ampere-turns of the holding coil becomes possible due to additional ampere-turns of the current passing through one of the ends of the current coil.

In FIG. 1 shows a high-speed

5 switch in the on position; in FIG. 2 - equivalent circuit breaker solenoid.

The switch contains a fixed 1 and movable 2 contacts, an electromagnet consisting of a frame 3 with two pole pieces 4 and 5 and a holding coil b, located on it, core 7, located above the pole pieces 4 and 5 and connected to the contact lever 8

5 with the possibility of moving to the stop 9, the core 10 installed between the pole pieces 4 and 5 and forming window 11 with the core 3 and located on the core 10 of the current coil 12 with two

0 ends 13 and 14, which pass through the window 11 according to the winding voltage of the track coil 12 and uhbdt on different sides of the window. For the contact lever 8, connected by an axis 15 with a lever 16, mounted on a fixed axis 17, a spring 18 is engaged. The actuator 19 is used to turn on. The switch 19 operates as follows. To turn on, a coil 6 is activated and, for example, an electromagnetic valve (not shown) of the pneumatic actuator 19. The actuator pusher presses the lever 8 and 16. Having overcome the pressing of the spring 18, it mixes the core 7, rigidly fixed on the lever .16, to the pole pieces 4 and 5. In this position, the lower end of the lever 8 is pressed against the lever 16, and a gap remains between the contacts 1 and 2. After turning off the drive 19, when its pusher moves to the right, the contact lever 8 under the action of the spring 18 will rotate around the axis 15 and the contacts 1 and 2 are closed. The armature 7 is held in an attracted position by a part of the magnetic flux excited in the frame 7 by the coil 6 (shown in the drawing as a solid line). A smaller portion of the flow from coil 6 branches into core 10.

The polarity of the connection of the current coil 12 is such that the main current of the circuit breaker, passing through one of the ends of the current coil 12 (for example, end 14), induces an additional magnetic flux in frame 7, directed in accordance with the flux from coil 6, and creates additional magnetizing force. This is the main current, the passage through the coil, (turns) of the current coil 12 and the other end (in this case, the end 13) of this coil, excites a stream in the core 10, which displaces the stream from core 7 (in the drawing, the displacement stream is shown by a dashed line ) As the main current increases, the magnetic resistance of pma 3 increases, and the flow in the cortex 7 weakens so much that the core 7 is torn off by the spring 18. Thus, in the proposed switch, the main current passes through one end of the current coil 12 (for example, end 14 ), together with the ampere turns of the coil 6, creates a magnetizing force that determines the setting of the switch, i.e. the use of the main current helps to reduce the number of ampere-turns of the coil 6 and, therefore, reduces the weight of its active materials.

The technical and economic efficiency of the claimed technical solution is as follows.

In the known switch, a holding electromagnet is used, with a large number of ampere-turns of the holding coil. In the proposed high-speed switch, this drawback is eliminated due to the fact that the ends of the current coil pass through the window formed by the core and the core and exit on opposite sides of the window, which allowed the necessary magnetizing force, which determines the setting of the switch, to be partially received from

use of the main current and thereby reduce the ampere-turns of the holding coil and make it less metal-intensive, requiring less energy consumption for its power.

Claims (1)

SUMMARY OF THE INVENTION High-speed switch containing contacts, an electromagnet consisting of a two-pole frame lugs, a coil located on it, a core located above the pole lugs and connected with the contact lever with the possibility of movement to the stop, a core installed between the pole lugs and forming a window with a frame, a current coil placed on the core, characterized in that to reduce the mass of active materials and energy consumption, the ends of the current coil pass through the window formed by the core and the core and exit on opposite sides of the window, and the polarity of the current coil What are the that produced by passing through With current, the magnetic flux in the RM is directed in accordance with the magnetic flux generated by the current of the holding coil.