CN101315836A - Adaptive Operating Mechanism Coupled with Electromagnetic Repulsion System and Permanent Magnet System - Google Patents

Abstract

The invention discloses an adaptive operating mechanism coupled with an electromagnetic repulsion system and a permanent magnet system. The invention adopts a vortex disk of an electromagnetic repulsion device with a circular frustum structure. At the same time as the output capacity, the increase in the mass of the motion system of the operating mechanism is greatly reduced, and the ability of the operating mechanism to drive loads can be greatly improved. The invention adopts an adaptive action scheme, avoids frequent high-speed actions of the circuit breaker, reduces the mechanical strength requirement of the circuit breaker, and can effectively prolong the operating life of the circuit breaker.

Description

Adaptive Operating Mechanism Coupled with Electromagnetic Repulsion System and Permanent Magnet System

technical field

The invention belongs to an operating mechanism used in a power system circuit breaker, in particular to an adaptive operating mechanism coupled with an electromagnetic repulsion system and a permanent magnet system.

Background technique

At present, the operating mechanisms of vacuum circuit breakers mainly include electromagnetic operating mechanisms, spring operating mechanisms and permanent magnetic operating mechanisms.

The electromagnetic operating mechanism has been widely used in the early stage of the development of vacuum circuit breakers, but the electromagnetic operating mechanism has a bulky structure and takes a long time to operate.

The spring operating mechanism is the most commonly used type of operating mechanism for vacuum circuit breakers. Its advantage is that it does not require a high-power DC power supply, but only needs a low-power AC-DC dual-purpose energy storage motor. The disadvantage is that the structure is relatively complicated. , the number of parts is large, and high machining accuracy is required, and the failure rate is high. Moreover, the output characteristics of the spring operating mechanism do not match the load characteristics of the vacuum circuit breaker, and a reasonable design must be made on the contour curve and the connecting rod structure.

The permanent magnet operating mechanism is an operating mechanism with a short development time. It uses permanent magnets instead of traditional locking devices to maintain the opening and closing positions of vacuum circuit breakers (sometimes only permanent magnets are used for closing and maintaining No opening and holding), there is only one main moving part when the permanent magnet operating mechanism is working, the opening and closing current is small, the requirements for the operating power supply are low, and its noise is also low. The structure of the permanent magnet operating mechanism is relatively simple, the operation reliability is high, the mechanical life is long, the volume is small, and the weight is light. However, under current conditions, the permanent magnet operating mechanism cannot reach a very high speed of action.

A fast electromagnetic thrust actuation mechanism is introduced in the document "Fast Electromagnetic Thrust Actuation Mechanism". Electromagnetic force and disk spring thrust enable the actuating rod to realize the actuating operation, which is small in size and can generate large operating work and operating speed to realize rapid action. The device utilizes an adjustable disc spring with a certain pressure in the "herringbone" shaped disc spring barrel to realize locking.

The document "A DC Hybrid Circuit Breaker With Ultra-Fast Contact Opening and Integrated Gate-Commutated Thyristors (IGCTs)" proposes a fast operating mechanism that combines an electromagnetic repulsion device (Thomson drive) and a permanent magnet mechanism. The device uses an electromagnetic repulsion device as a The opening power uses the permanent magnet mechanism to maintain the opening and closing positions. This device does not need a mechanical lock. When applied to the circuit breaker proposed in this paper, the average action speed reaches 10m/s.

The electromagnetic repulsion device used in the above-mentioned quick operating mechanism adopts a round pie-shaped eddy current disk. When the load that the quick operating mechanism needs to drive is large, the electromagnetic repulsion device needs to provide a very large electromagnetic repulsion to achieve faster action. At this time, in order to improve the mechanical strength of the eddy current disk of the electromagnetic repulsion mechanism, it is necessary to increase the thickness of the eddy current disk, which will lead to a substantial increase in the mass of the vortex disk, and the motion inertia of the motion system of the operating mechanism will increase significantly, which is not conducive to the operating mechanism. Perform quick operation under heavy load; at the same time, the above-mentioned quick operating mechanism only provides the only opening action scheme, that is, the electromagnetic repulsion device is used to realize quick action opening. When the operating mechanism performs short-circuit opening of the circuit breaker, Quick action is very necessary, but in the process of using the circuit breaker, short-circuit opening is not common, while opening under rated current and no-load is more frequent, frequent high-speed action will affect the strength of all aspects of the circuit breaker Putting forward very high requirements is not conducive to ensuring a long service life of the circuit breaker.

Contents of the invention

The purpose of the present invention is to overcome the disadvantages of the prior art and provide an adaptive operating mechanism coupled with an electromagnetic repulsion system and a permanent magnet system. The mechanism has reasonable structure, high operational reliability and long service life.

Technical scheme of the present invention is realized like this:

The invention comprises a driving rod, the driving rod is connected with the metal eddy current disk of the electromagnetic repulsion device through the hole in the middle of the coil mounting plate of the electromagnetic repulsion device, the metal eddy current disk of the electromagnetic repulsion device is connected with the monostable permanent magnet mechanism, and the monostable permanent magnet mechanism The other end is connected to the opening spring, and the other end of the opening spring is connected to the fixed frame. The coil of the electromagnetic repulsion device is fixed on the coil mounting plate of the electromagnetic repulsion device. One end of the coil of the electromagnetic repulsion device is connected to one end of the power supply capacitor of the coil of the electromagnetic repulsion device. The other end of the coil of the electromagnetic repulsion device and the other end of the power supply capacitor of the coil of the electromagnetic repulsion device are respectively connected to the electronic monitoring module, and the electronic monitoring module is connected to one end of the coil of the monostable permanent magnet mechanism. The other end of the coil is connected in parallel with the opening power supply capacitor of the monostable permanent magnet mechanism coil and the closing power supply capacitor of the monostable permanent magnet mechanism coil, and the opening power supply capacitor of the monostable permanent magnet mechanism coil is connected with the closing power supply capacitor of the monostable permanent magnet mechanism coil. The gate power supply capacitors are respectively connected to the electronic monitoring module.

A buffer is also fixed on the fixed frame.

Effect of the present invention is reflected in:

1) The present invention adopts the vortex disk of the electromagnetic repulsion device with a circular frustum structure. Compared with the circular cake-shaped vortex disk, while maintaining the mechanical strength and output capacity of the vortex disk, it greatly reduces the movement system of the operating mechanism. The increase of mass can greatly improve the ability of the operating mechanism to drive the load.

2) The present invention adopts an adaptive action scheme, which avoids frequent high-speed actions of the circuit breaker, reduces the mechanical strength requirements of the circuit breaker, and can effectively prolong the operating life of the circuit breaker.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the present invention in the closing and holding state.

Fig. 2 is a schematic diagram of the structure of the present invention in the state of opening and holding.

The content of the present invention will be described in further detail below in conjunction with the accompanying drawings.

Detailed ways

Referring to Fig. 1 and Fig. 2, the present invention mainly consists of an electromagnetic repulsion device and a monostable permanent magnet mechanism connected through an axially movable drive rod.

The electromagnetic repulsion device has the electromagnetic repulsion device metal eddy current disc 4 and the electromagnetic repulsion device coil mounting plate 2 fixedly arranged on the driving rod 1, and the electromagnetic repulsion device coil mounting plate 2 can be fixed on the applied coil of the present invention. On the breaker frame, the electronic monitoring module 14 controls the coil power supply capacitor 11 of the electromagnetic repulsion device to supply power to the coil 3 of the electromagnetic repulsion device.

The monostable permanent magnet mechanism has the monostable permanent magnet mechanism moving iron core 8 fixedly arranged on the drive rod, the monostable permanent magnet mechanism static iron core 6 fixed on the applied circuit breaker frame of the present invention, and the monostable permanent magnet mechanism static iron core 6. The static permanent magnet mechanism static iron core 6 is solidly connected to the monostable permanent magnet mechanism permanent magnet 5 and the monostable permanent magnet mechanism coil 7, and the opening spring is fixedly connected to the drive rod at one end and fixed to the fixed frame 16 at the other end 9. The electronic monitoring module 14 controls the pre-charged monostable permanent magnet mechanism coil opening power supply capacitor 12 and the monostable permanent magnet mechanism coil closing power supply capacitor 13, and controls the monostable permanent magnet mechanism coil 7 according to different working conditions. power supply.

The corresponding structural arrangement also includes a buffer device 10 fixedly connected to the fixed frame 16 , and the buffer cap of the buffer device 10 is located on the same axis as the drive rod 1 .

The whole mechanism is a circular structure, and all parts are axially symmetrical about the drive rod.

The mechanism works as follows:

Fast short-circuit opening: the electronic monitoring module 14 controls the pre-charged electromagnetic repulsion device coil power supply capacitor 11 to discharge the electromagnetic repulsion device coil 3 to generate high-frequency current and magnetic field. The eddy current opposite to the current in the coil 3 of the electromagnetic repulsion device is induced, and the magnetic fields generated by the coil current and the eddy current are in a reverse relationship. The two interact to generate mutually repulsive electromotive force, and the eddy current disk drives the drive rod to move in the axial direction, so that the drive The lever reaches the opening holding position (Figure 2), and the driving lever 1 is maintained at the opening holding position by the opening spring 9 in a stretched state.

Normal speed opening action under rated current and no load: the electronic monitoring module 14 controls the pre-charged monostable permanent magnet mechanism coil to open the power supply capacitor 12 to discharge the monostable permanent magnet mechanism coil 7, and the current in the moving iron The upper end of the core generates a magnetic field opposite to the magnetic field of the permanent magnet, so that the upward resultant force received by the moving iron core is smaller than the downward resultant force, and the moving iron core drives the driving rod to move downward in the axial direction to the opening holding position, as shown in Figure 2, in the pulling position. The opening spring 9 in the extended state keeps the driving rod 1 in the opening holding position.

Closing: the electronic monitoring module 14 controls the monostable permanent magnet mechanism closing power supply capacitor 13 that is opposite to the monostable permanent magnet mechanism opening power supply capacitor 12 pre-charged voltage to discharge the monostable permanent magnet mechanism coil 7. A magnetic field in the same direction as the permanent magnet magnetic field is generated inside the static iron core, which increases the magnetic attraction force on the upper end of the moving iron core, and the upward resultant force is greater than the downward resultant force. Position, as shown in Figure 1, the permanent magnet 5 of the monostable permanent magnet mechanism generates a magnetic attraction to maintain the drive rod at the closing and holding position.

Claims (2)

1, electromagnetic repulsion force system and permanent magnetic system coupled self-adapting control mechanism, comprise drive rod (1), it is characterized in that, drive rod (1) links to each other with electromagnetic repulsion force device metal eddy-current disc (4) by the hole in the middle of the electromagnetic repulsion force device coil mounting panel (2), electromagnetic repulsion force device metal eddy-current disc (4) is connected with Monostable permanent magnetic mechanism (15), the other end of Monostable permanent magnetic mechanism (15) is connected with tripping spring (9), the other end of tripping spring (9) is connected on the fixed frame (16), electromagnetic repulsion force device coil (3) is fixed on the electromagnetic repulsion force device coil mounting panel (2), one end of electromagnetic repulsion force device coil (3) is connected with an end of electromagnetic repulsion force device coil power supply electric capacity (11), the other end of electromagnetic repulsion force device coil (3), the other end of electromagnetic repulsion force device coil power supply electric capacity (11) is connected with electronic monitoring module (14) respectively, electronic monitoring module (14) links to each other with an end of the coil of Monostable permanent magnetic mechanism (15), the other end of the coil of Monostable permanent magnetic mechanism (15) is in parallel with Monostable permanent magnetic mechanism coil separating brake power supply electric capacity (12) and Monostable permanent magnetic mechanism coil combined floodgate power supply electric capacity (13), and Monostable permanent magnetic mechanism coil separating brake power supply electric capacity (12) and Monostable permanent magnetic mechanism coil combined floodgate power supply electric capacity (13) are connected on the electronic monitoring module (14).

2, electromagnetic repulsion force system according to claim 1 and permanent magnetic system coupled self-adapting control mechanism is characterized in that, buffer (10) is fixed on the fixed frame (16).

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