CN110890249A

CN110890249A - Magnetic force driven high-voltage switch

Info

Publication number: CN110890249A
Application number: CN201811046481.4A
Authority: CN
Inventors: 王在彬; 王姿余; 陈爱美
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-09-08
Filing date: 2018-09-08
Publication date: 2020-03-17

Abstract

The invention provides a magnetic force driving high-voltage switch, which mainly comprises the following components: the high-voltage circuit comprises a high-voltage circuit lead, a high-voltage cavity, a static contact, a moving contact, a driven permanent magnet, an actuating mechanism and the like. The position of the driven permanent magnet in the high-voltage cavity is driven to change under the action of a magnetic field by controlling the change of the magnet outside the high-voltage cavity, so that the switch is switched on and off. All high-voltage electrified parts of the switch, such as a static contact, a moving contact and the like, are positioned in the high-voltage cavity or surrounded by the insulator, so that the miniaturization of the high-voltage switch can be realized, and the requirement on the installation space of the high-voltage switch can be reduced.

Description

Magnetic force driven high-voltage switch

Technical Field

The invention provides a magnetic force driving high-voltage switch in the field of power systems. One case is suitable for a high-voltage and low-current power circuit. For example, the magnetic force-driven high-voltage switch is suitable for connection between a bus of a power system and equipment such as an arrester and a voltage transformer, and connection or disconnection between the equipment such as the arrester and the voltage transformer and the power system can be realized by controlling on or off of the magnetic force-driven high-voltage switch. In another case, the circuit breaker is suitable for use in a main current loop with a circuit breaker.

Background

In an electric power system, devices such as a metal oxide arrester and a TBP overvoltage protector are directly connected with a bus of the electric power system. However, when an auxiliary device such as a metal oxide arrester or a TBP overvoltage protector fails or degrades in performance, the metal oxide arrester or the TBP overvoltage protector that has failed or degraded in performance should be timely detached from the power system in order to improve the operation stability of the power system.

Currently, the high-voltage switch or circuit breaker is bulky due to the requirement of the contact and other high-voltage parts of the high-voltage switch or circuit breaker for a safe distance.

The contact and other high-voltage parts of the magnetic force driving high-voltage switch are all surrounded by insulating materials, so that the miniaturization of equipment can be realized.

Disclosure of Invention

The invention provides a magnetic force driving high-voltage switch. The main components include: the high-voltage circuit comprises a high-voltage loop wire, a high-voltage cavity, a static contact, a moving contact, an actuating mechanism, a driven permanent magnet, a high-voltage cavity outer magnet, a power driving mechanism, a position feedback mechanism and the like.

A pair of static contacts is arranged in the high-voltage cavity and connected with an external high-voltage wire through a high-voltage loop wire.

A pair of moving contacts and a driven permanent magnet in the high-pressure cavity can rotate around the central shaft of the bearing in the high-pressure cavity. When the moving contact is contacted with the fixed contact, the high-voltage switch is driven to be closed by magnetic force; when the driven permanent magnet and the moving contact rotate around the central shaft by 90 degrees, the magnetic force is pressed open to be in the off position.

The power driving mechanism is connected with the high-pressure cavity outer magnet through a driving shaft so as to control the rotation of the high-pressure cavity outer magnet.

Due to the action of the magnetic field, the N pole and the S pole of the high-voltage cavity outer magnet and the N pole and the S pole of the driven permanent magnet are always in the same spatial plane, and the rotation of the driven permanent magnet can be controlled by rotating the high-voltage cavity outer magnet.

When the center line between the N pole and the S pole of the magnet outside the high-voltage cavity is parallel to the center line between the two static contacts, the high-voltage switch is driven to be in a closed state by magnetic force; when the center line between the N pole and the S pole of the magnet outside the high-voltage cavity is perpendicular to the center line between the two static contacts, the magnetic force is pressed open at a disconnection position.

Therefore, the movable contact can be driven to rotate by controlling the rotating position of the magnet outside the high-voltage cavity, so that the switch is switched on or off.

Because the moving contact and the static contact are both in the closed high-voltage cavity, the charged part is well insulated from the outside, and the installation space of the high-voltage switch can be reduced.

Drawings

Fig. 1 is a schematic structural diagram of a magnetically-driven high-voltage switch, in which 1 is a fixed contact and a high-voltage loop wire, 2 is a movable contact, 3 is a driven permanent magnet, 4 is a high-voltage cavity inner bearing, 5 is a high-voltage cavity outer magnet, 6 is an outer bearing, 7 is a driving shaft, 8 is an insulator, and 9 is a high-voltage cavity.

Fig. 2 is a schematic structural diagram of a rotating component in a high-voltage cavity, wherein 11 is an N pole of a driven permanent magnet, 12 is the driven permanent magnet, 13 is an S pole of the driven permanent magnet, 14 and 16 are contacts of movable contacts, and 15 is an electric conductor between the movable contacts.

Detailed Description

The main structure of the magnetic force driven high-voltage switch is shown in fig. 1, a pair of stationary contact points are arranged at the bottom in a high-voltage cavity, and the midpoint of a connecting line between the positions of the stationary contact points is on the central axis of the cylindrical high-voltage cavity.

Fig. 2 is a schematic structural diagram of a rotating component in a high-pressure cavity. The upper half of fig. 2 is a side view of the rotating member, and the lower half of fig. 2 is a top view of the rotating member. The rotating member is rotatable within the high pressure chamber about a central axis of the high pressure chamber.

The driving shaft of the motor is connected with the driving shaft of the magnetic force driven high-voltage switch, and the position feedback mechanism can measure and feed back the rotating position of the motor.

When the magnetic force drives the high-voltage switch to be in the closed position, the position feedback mechanism detects the corresponding rotating position. At the moment, the N pole and the S pole of the high-voltage cavity outer magnet, the N pole and the S pole of the driven permanent magnet, the pair of contacts of the moving contact and the pair of contacts of the static contact are all in the same plane.

If the magnetically actuated high voltage switch is to be in the off position, the drive shaft of the motor needs to be rotated 90 degrees. At the moment, the N pole and the S pole of the high-voltage cavity outer magnet, the N pole and the S pole of the driven permanent magnet and a pair of contacts of the moving contact are in the same plane, and the pair of contacts of the static contact is in the other plane. Both planes pass through the central axis of the high pressure chamber and are perpendicular to each other.

When the magnetically driven high voltage switch is in the off position, if the state of the switch is to be changed to bring the switch into the on position, the drive shaft of the motor needs to be rotated 90 degrees.

In the magnetic force driving high-voltage switch, the high-voltage electric conduction parts are all arranged in the high-voltage cavity, the high-voltage cavity is closed, and in order to improve the arc extinguishing capability of the magnetic force driving high-voltage switch, the high-voltage cavity can be filled with gases such as sulfur hexafluoride and the like.

Claims

1. The invention provides a magnetic force driving high-voltage switch, which is characterized in that: the moving contact and the static contact of the high-voltage switch are arranged in the closed high-voltage cavity, and the movement of the moving contact is controlled by the interaction force of the magnetic field, so that the switch is switched on or off.

2. A magnetically actuated high voltage switch according to claim 1, wherein: the moving contact is fixed with the driven permanent magnet together, and the movement of the moving contact is realized by controlling the position change of the driven permanent magnet.

3. A magnetically actuated high voltage switch according to claim 1, wherein: the magnet outside the high-pressure cavity interacts with the driven permanent magnet in the high-pressure cavity, and the position change of the driven permanent magnet in the high-pressure cavity is controlled by changing the change of the magnet outside the high-pressure cavity.

4. A magnetically actuated high voltage switch according to claim 1, wherein: the high-pressure cavity outer magnet can be a permanent magnet or a magnet in the form of an electromagnet and the like, and the high-pressure cavity outer magnet is used for providing a driving magnetic field for the rotation of the driven permanent magnet.

5. A magnetically actuated high voltage switch according to claim 1, wherein: in order to improve the arc extinguishing capability of the magnetic force driving high-voltage switch, the high-voltage cavity can be filled with gases such as sulfur hexafluoride and the like.