RU2390065C1 - Smoothly adjustable arc-suppression coil - Google Patents

Abstract

FIELD: power industry.

SUBSTANCE: smoothly adjustable arc-suppression coil includes excitation winding and magnetic system consisting of fixed and movable magnetic conductors. Fixed magnetic conductor has a nonmagnetic gap in which movable magnetic conductor made in the form of ferromagnetic ring of variable cross section can be moved. By being rotated about its own axis, the ring fills the volume of non-magnetic gap, and as a result, it changes the coil inductance. Forces acting on movable magnetic conductor are opposite directed and their resultant force is equal to zero.

EFFECT: decreasing noise and vibration, increasing intensity of magnetic field and reducing material consumption of the coil.

1 dwg

Description

The invention relates to the field of electrical engineering and can be used in the manufacture of arc suppression reactors for networks with compensated neutral.

Known continuously adjustable arc suppression reactor (1), containing an excitation winding and a magnetic system consisting of a movable and fixed magnetic circuits. The fixed magnetic circuit has a non-magnetic gap, into the area of which a movable magnetic circuit can be moved in or out. It is moved with a lead screw, changing the amount of space not occupied by ferromagnetic material, and thereby reducing or increasing the magnetic resistance to magnetic flux.

The disadvantage of this reactor is the increased material consumption, due to the need to reduce the magnetic field due to increased noise and strong vibration. These undesirable phenomena occur due to loose fit of the lead screw in the body of the movable magnetic circuit. If this landing is made tight, without play, the lead screw will not be able to rotate freely.

Vibration of the moving magnetic circuit is caused by the force acting on it from the side of the magnetic field. This force is proportional to the square of the magnetic field strength and pulsates at an alternating current with a double frequency. With one-sided traction of the moving magnetic circuit and the presence of play, high magnetic field intensities are unacceptable, which entails an increase in material consumption.

To reduce this drawback is proposed by changing the design of the arc suppression reactor. The proposed reactor contains an excitation winding and a magnetic system consisting of a fixed and movable magnetic circuits. The fixed magnetic circuit contains a non-magnetic gap. The moving magnetic circuit is a closed ferromagnetic ring with a smooth change in cross section. The ring can rotate smoothly around its axis, introducing a part of its ferromagnetic body into the non-magnetic gap zone. In this way, smoothness in the regulation of inductance is achieved. The larger the body volume, the less volume remains per fraction of the magnetic field and the greater the inductance of the reactor, since the magnetic field inside the ferromagnet practically does not affect it.

The proposed continuously adjustable arc suppression reactor is shown in the drawing.

It contains an excitation winding 1, a fixed magnetic circuit 2 with a non-magnetic gap, and a movable ferromagnetic ring 3 with a smoothly varying cross section. Ring 3 can smoothly rotate around its axis 4, filling part of the non-magnetic gap zone with a different volume of its ferromagnetic material. Since the cross section of the ring 3 smoothly varies depending on the angle of rotation, the inductance of the reactor changes smoothly.

The reactor operates as follows. The field winding 1 creates a magnetic flux in the magnetic circuit 2 and in the non-magnetic gap. The smooth rotation of the ring 3 around the axis 4 smoothly changes the volume of the ferromagnetic body in the non-magnetic gap and the inductance of the reactor as a whole.

The proposed design allows to reduce the noise and vibration of the reactor and to reduce its material consumption. This became possible due to the fact that the force acting on the movable magnetic circuit, from one-sided turned into two-sided. She does not seek to displace the movable magnetic circuit, but only stretches it. If, for example, an electro-technical steel resistant to mechanical stretching is used as the ferromagnetic material of ring 3, vibration and noise are reduced. This allows you to increase the magnetic field strength and reduce material consumption.

Information sources

1. Instructions for the selection, installation and operation of arc suppression coils. M .: Energy, 1971, 104 pp.

Claims (1)

A continuously adjustable arc suppression reactor containing an excitation winding and a magnetic system consisting of a fixed and movable magnetic circuits, the fixed magnetic circuit has a non-magnetic gap in the area of which the movable magnetic circuit can move smoothly, characterized in that the movable magnetic circuit is a closed ferromagnetic ring with a smooth change in cross section , and the movement of the ring is carried out by its rotation around its axis.