CN102522256B - Disc-type overlapping gyromagnetic vacuum arc extinguish chamber - Google Patents

Abstract

The invention belongs to the field of vacuum circuit breakers, in particular to a disk-type stacked rotary magnetic vacuum interrupter, which includes a conductive rod (1), a contact cup bottom (2) and a contact cup (3); the contact cup bottom (2) and the contact cup (3) are fixedly connected with the conductive rod (1) in turn; place an equal portion of the iron core (7) with a winding slot (6) in the contact cup (3); in the winding slot ( 6) The coil winding (8) is built in; the coil winding (8) is radially distributed into a disc structure; the contact piece (4) is fixed at the end of the contact cup bottom (2); two groups The above coaxial coil windings (8) are stacked and placed in the winding slots (6) and are sequentially staggered by a certain angle θ. The present invention can generate a longitudinal magnetic field while providing a transverse magnetic field, which is more conducive to the dissipation of arc energy. The arc cooling block has good insulation performance, strong breaking capacity, convenient installation and maintenance, and high operational reliability.

Description

Disk type stacked gyromagnetic vacuum interrupter

technical field

The invention belongs to the field of vacuum circuit breakers, in particular to a disc-shaped stacked gyromagnetic vacuum interrupter.

Background technique

In the power system, high-voltage switchgear plays the role of control and protection. High-voltage circuit breakers are the most important electrical equipment, mainly used for closing and breaking circuits. In recent years, with the rapid development of the electric power industry, the voltage level and capacity have been increasing day by day, and the demand for high performance and low pollution electricity has provided a broader research and development and application space for the development of vacuum circuit breakers.

The improvement of the contact structure of the vacuum interrupter has mainly gone through three stages: the disc-shaped flat contact, the transverse magnetic field contact and the longitudinal magnetic field contact.

(1) Disc-shaped flat contact: The disc-shaped flat contact has a simple structure and high mechanical strength, and is usually used in vacuum load switches or vacuum contactors. For the disc-shaped flat contact, when the breaking current is large, spots will appear on the anode, the vacuum arc will produce a strong contraction phenomenon, and the metal vapor arc will change from the diffusion type to the contraction type, which will lead to breaking failure.

(2) Transverse magnetic field contact: There is a spiral groove on the contact piece and when a current flows through the contact, a magnetic field perpendicular to the axis of the arc column will be generated. The Lorentz force generated by the interaction between the transverse magnetic field contact and the arc current makes the arc move in the circumferential direction, and the transverse magnetic field will bend and elongate the moving arc, which will increase the arc voltage and arc energy, resulting in limited breaking capacity , and the ablation degree of the contact is still stronger when the arc gathers than when the arc spreads, the density of the remaining plasma in the arc gap is still high when the current crosses zero, and the restrike phenomenon will still occur when the recovery voltage is high.

(3) Longitudinal magnetic field contact: The magnetic field line of the longitudinal magnetic field contact structure is consistent with the flow direction of the arc current, which can resist the contraction of the arc and increase the critical value of the arc from the diffusion type to the contraction type. When the current crosses zero, the longitudinal magnetic field is very unfavorable to the diffusion and attenuation of plasma and neutral particles. The existence of eddy current not only reduces the intensity of the longitudinal magnetic field between the contacts, but also makes the longitudinal magnetic field lag behind the current change, so that there is still a residual longitudinal magnetic field between the contacts when the current crosses zero.

Contents of the invention

The present invention aims to overcome the deficiencies of the prior art and provide a disk-type stacked gyromagnetic vacuum interrupter, which can generate a longitudinal magnetic field while providing a transverse magnetic field, which is more conducive to the escape of arc energy. Dispersion, arc cooling block, good insulation performance, strong breaking capacity, convenient installation and maintenance, and high operational reliability.

In order to solve the problems of the technologies described above, the present invention is achieved in that:

Disk-type stacked gyromagnetic vacuum interrupter, which includes a conductive rod, a contact cup bottom, an iron core and a contact cup; the contact cup bottom and the contact cup are fixedly connected with the conductive rod in sequence; the iron core Put it into the contact cup; there are winding slots in equal parts on the iron core; more than two sets of coaxial coil windings are stacked into the winding slots and staggered by a certain angle θ in turn.

As a preferred solution, the number of winding slots in the present invention is 12-30.

As another preferred solution, the slot width of the winding slot in the present invention is 2.5-3 mm.

Further, the coil windings of the present invention are radially distributed in a disc structure.

Furthermore, in the present invention, a contact piece is fixed at the end of the bottom of the contact cup.

In addition, the angle θ of the present invention is between 5° and 15°.

In the present invention, after the three-phase alternating current is applied, the conduction current flows into the contact cup through the conductive rod, and forms a rotating magnetic field in the contact cup through the winding coil. Due to the staggered coil winding arrangement, each group of coils generates The direction of the magnetic field is not the same, and through the joint action of the contacts with the same structure on the other side, rotating magnetic fields with different rotating frequencies are generated in the middle air gap, and the strength of the rotating magnetic field is also increased. Drive the arc energy to rotate at high speed between the moving and static contacts, and release the energy quickly, thereby reducing the arc burning time and prolonging the life of the switch.

The new contact structure adopted in the present invention makes the arc energy in the vacuum interrupter chamber driven by the rotating magnetic field to change from the traditional axial flow to the vortex flow. During the movement, the gas undergoes radial exchange of kinetic energy and is quickly taken away. The arc energy extinguishes the arc. The contact structure of the invention can effectively reduce the arc temperature, accelerate the release of arc energy, reduce the degree of contact ablation, protect the contact structure, and improve the breaking capacity of the vacuum circuit breaker.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Figure 1 is a schematic diagram of the overall structure of the present invention.

Figure 2 is a schematic diagram of slotting the iron core of the present invention.

Fig. 3 is a schematic diagram of the coil winding of the present invention.

Figure 4 is a schematic diagram of the coaxial coil winding of the present invention.

In the figure: 1. Conductive rod; 2. Contact cup bottom; 3. Contact cup; 4. Contact piece; 5. Arc; 6. Winding slot; 7. Iron core; 8. Coil winding.

Detailed ways

As shown in the figure, the disk-type stacked gyromagnetic vacuum interrupter includes a conductive rod 1, a contact cup bottom 2, an iron core 7 and a contact cup 3; the contact cup bottom 2 and the contact cup 3 are connected to Conductive rods 1 are fixedly connected in turn; the iron core 7 is placed in the contact cup 3; winding slots 6 are opened in equal parts on the iron core 7; more than two sets of coaxial coil windings 8 are stacked into the winding slots 6 Inside and sequentially staggered by a certain angle θ.

In the present invention, 2 to 5 groups of coaxial coil windings 8 are stacked into the winding slots 6 and staggered by a certain angle θ in turn, and the angle is 10°.

The number of winding slots 6 in the present invention is 12-30. The slot width of the winding slot 6 in the present invention is 2.5-3mm. The coil windings 8 of the present invention are radially distributed in a disc structure. In order to protect the coil winding 8 in the contact, the present invention fixes a contact piece 4 at the end of the contact cup bottom 2 .

The disk-type stacked gyromagnetic vacuum interrupter of the present invention can equate the contact cup with the armature of the motor by slotting the contact cup, and the effective conductors of the armature winding are radially distributed in space Into a disc structure. Coil windings are manufactured using copper sheet punching and then welding.

Referring to Fig. 1, the disk-type stacked rotary magnetic vacuum interrupter includes a conductive rod 1, a contact cup bottom 2, a contact cup (armature) 3, and a contact piece 4.

Referring to Fig. 2, the present invention places an iron core 7 with a slot 6 every 30° in the contact cup (armature) 3, and the slot width is 2.5mm.

As shown in FIG. 3 , the coil winding 8 of the present invention is manufactured by stamping copper plates and then welding, and is radially distributed in a disc structure.

Referring to Fig. 4, the present invention stacks a group of coaxial iron cores in the contact cup, and staggers a certain angle of 10°.

The present invention adopts this structure for both dynamic and static contacts. During the breaking process, there will be an arc area between the dynamic and the static. Through the action of the three-phase alternating current, under the action of the coil windings of the dynamic and static contacts, a rotating magnetic field will appear on the contact surface. Since the vacuum arc is formed by Composed of metal plasma, through the action of the arc, a strong rotating magnetic field will also be generated in the arc area between the moving and static contacts. Through the strong action of the rotating magnetic field, the arc energy will be quickly taken away, the arc will be extinguished, and the arc temperature will be effectively reduced. , Accelerate the release of arc energy, reduce the degree of contact ablation, protect the contact structure, and improve the breaking capacity of the vacuum circuit breaker.

The invention can meet the breaking requirements under special working conditions, and at the same time, the invention has strong capacitive current breaking ability, and can improve product reliability and safe operation through simulation test research.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (1)

1. The disc-type stacked gyromagnetic vacuum interrupter is characterized in that it includes a conductive rod (1), a contact cup bottom (2), an iron core (7) and a contact cup (3); the contact cup The bottom (2) and the contact cup (3) are fixedly connected with the conductive rod (1) in sequence; the iron core (7) is placed in the contact cup (3); equal parts are placed on the iron core (7) There are winding slots (6); more than two sets of coaxial coil windings (8) are stacked into the winding slots (6) and staggered by a certain angle θ; the number of the winding slots (6) is 12; the The slot width of the winding slot (6) is 2.5mm; the coil winding (8) is radially distributed into a disk structure; the end of the contact cup bottom (2) is fixed with a contact piece (4); the angle θ=10°.