CN102522259A - Disc-type overlapping gyromagnetic longitudinal blowing vacuum arc extinguish chamber - Google Patents

Abstract

The invention belongs to the field of vacuum circuit breakers, and particularly relates to a disc-type stacked rotary magnetic vertical blowing vacuum interrupter, which includes a conductive rod (1), a contact cup (5), an iron core (7) and a The electrode (4) connected to the head cup (5); the contact cup (5) is fixedly connected with the conductive rod (1); the iron core (7) is placed in the contact cup (5); There are an even number of circulating side slots on the contact cup (5); winding slots (6) are opened on the iron core (7); more than two sets of coaxial coil windings (8) are stacked and placed Inside the winding slot (6) and sequentially staggered by a certain angle θ. The invention can reduce the arc voltage through the strong action of the rotating magnetic field and the action of the longitudinal magnetic field at the same time, drive the arc column to distribute evenly on the anode surface, accelerate the release of arc energy, and improve the breaking capacity of the vacuum circuit breaker.

Description

Disk-type stacked rotary magnetic vertical blowing vacuum interrupter

technical field

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

Background technique

Vacuum circuit breaker is named for its arc extinguishing medium and the insulating medium of the contact gap after arc extinguishing are both high vacuum; it has the advantages of small size, light weight, suitable for frequent operation, and no maintenance for arc extinguishing. The application is more popular. Vacuum circuit breaker is an indoor power distribution device in 3-10kV, 50Hz three-phase AC system, which can be used for protection and control of electrical equipment in industrial and mining enterprises, power plants, and substations, especially suitable for oil-free, less In places where maintenance and frequent operations are used, circuit breakers can be configured in central cabinets, double-layer cabinets, and fixed cabinets to control and protect high-voltage electrical equipment.

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 longitudinal blowing vacuum interrupter, which can generate a longitudinal magnetic field while providing a transverse magnetic field, which is more conducive to arc energy. The dissipation, the arc temperature drop block, the insulation performance is good, the breaking capacity is strong, the installation and maintenance are convenient, and the operation reliability is high.

In order to solve the above-mentioned technical problems, the present invention is achieved in the following way: a disc-type stacked rotary magnetic vertical blowing vacuum interrupter, which includes a conductive rod, a contact cup, an iron core and electrodes connected to the contact cup; The contact cup is fixedly connected with the conductive rod; the iron core is placed in the contact cup; an even number of circulating side slots are opened in equal parts on the contact cup; windings are opened in equal parts on the iron core Slot; more than two sets of coaxial coil windings are stacked into the winding slot and staggered by a certain angle θ.

As a preferred solution, the number of winding slots in the present invention can be selected from 12 to 30.

As another preferred solution, the slot width of the winding slot in the present invention can be selected as 2.5-3mm.

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

Furthermore, in the present invention, contact pieces are fixedly provided at the ends of the electrodes.

The angle θ in the present invention is between 5° and 15°.

The contact cup used in the present invention is a contact structure capable of generating a longitudinal magnetic field, which superimposes and cooperates with the rotating magnetic field generated by the coil winding with a disc structure to extinguish the arc.

In the present invention, after the three-phase alternating current is applied, the conduction current flows into the contact cup through the conductive rod, forms a rotating magnetic field in the contact cup through the winding coil, and works together through another contact with the same structure. The coil windings are arranged so that the direction of the magnetic field generated by each group of coils is different at the same time, and through the joint action of the contacts with the same structure on the other side, a rotating magnetic field with different rotation frequencies is generated in the middle air gap, and at the same time it increases the strength of the rotating magnetic field. 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. Under the action of the longitudinal magnetic field, the arc voltage can be reduced and the arc column can be driven Evenly distributed on the surface of the anode, reducing the current density in the local area, thereby eliminating anode spots or increasing the critical current value for forming anode spots. During the movement, the gas undergoes a radial exchange of kinetic energy, which quickly takes away the arc energy and 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.

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

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

Detailed ways

As shown in the figure, the disk-type stacked rotary magnetic vertical blowing vacuum interrupter includes a conductive rod 1, a contact cup 5, an iron core 7 and an electrode 4 connected to the contact cup 5; the contact The cup 5 is fixedly connected with the conductive rod 1; the iron core 7 is placed in the contact cup 5; an even number of circulating side grooves are opened on the contact cup 5 in equal parts; There are winding slots 6; more than two sets of coaxial coil windings 8 are stacked and placed in the winding slots 6 and staggered by a certain angle θ in turn.

Two to five sets of coil windings 8 can be coaxially stacked in the iron core 7 of the present invention. Each of the coaxial coil windings in the present invention can be staggered by an angle; take 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 2.5-3 mm. 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 3 at the end of the electrode 4 .

The disk-type stacked rotary magnetic vertical blowing vacuum interrupter of the present invention can equate the contact cup with the armature of the motor through slots on the contact cup, and the effective conductor of the armature winding radiates radially in space. Distributed 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 vertical blowing vacuum interrupter includes a conductive rod 1 , a contact piece 3 , an electrode 4 and a contact cup 5 .

Referring to Fig. 2, the present invention places an iron core 7 in the contact cup (armature) 5, and the iron core 7 has a winding slot 6 every 30°, 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 coil windings 8 in the iron core and staggers them at a certain angle.

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 voltage drives the arc column to distribute evenly on the anode surface, reduces the current density in the local area, thereby eliminating anode spots or increasing the critical current value for forming anode spots, effectively reducing the arc temperature, accelerating the release of arc energy, and reducing the degree of contact ablation , Protect the contact structure, extinguish the arc, 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 (6)

1. the folded formula gyromagnet of dish-type is vertical blows vacuum interrupter, it is characterized in that, comprises conducting rod (1), contact cup (5), iron core (7) and the electrode (4) that joins with said contact cup (5); Said contact cup (5) fixedly connects with conducting rod (1); Said iron core (7) is inserted in the contact cup (5); Go up equal portions at said contact cup (5) and have even number circulation side channel; Go up equal portions at said iron core (7) and have slot for winding (6); Two groups of above coaxial coil windings (8) stack inserts in the slot for winding (6) and the certain angle θ that staggers successively.

2. the folded formula gyromagnet of dish-type according to claim 1 is vertical to blow vacuum interrupter, and it is characterized in that: the number of said slot for winding (6) is 12～30.

3. the folded formula gyromagnet of dish-type according to claim 2 is vertical to blow vacuum interrupter, and it is characterized in that: the groove width of said slot for winding (6) is 2.5～3mm.

4. the folded formula gyromagnet of dish-type according to claim 3 is vertical to blow vacuum interrupter, and it is characterized in that: said coil windings (8) radially is scattered in tray type structure radially.

5. the folded formula gyromagnet of dish-type according to claim 4 is vertical to blow vacuum interrupter, and it is characterized in that: the end at said electrode (4) is fixed with contact blade.

6. the folded formula gyromagnet of dish-type according to claim 5 is vertical to blow vacuum interrupter, and it is characterized in that: said angle θ is between 5 °～15 °.

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