CN105140073A - Vacuum arc extinguishing chamber and operation method thereof - Google Patents
Vacuum arc extinguishing chamber and operation method thereof Download PDFInfo
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- CN105140073A CN105140073A CN201510441317.3A CN201510441317A CN105140073A CN 105140073 A CN105140073 A CN 105140073A CN 201510441317 A CN201510441317 A CN 201510441317A CN 105140073 A CN105140073 A CN 105140073A
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- vacuum interrupter
- radome
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- moving contact
- moving
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
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Abstract
The invention provides a vacuum arc extinguishing chamber and an operation method thereof. The vacuum arc extinguishing chamber comprises a shell, a static end part, a first movable end part and a second movable end part, wherein the static end part is arranged in the shell and divides an inner cavity of the shell into a first arc extinguishing chamber and a second arc extinguishing chamber which are independent to each other; the first movable end part comprises a first movable contact, and the first movable contact is arranged in the first arc extinguishing chamber and provided with a closing position where the first movable contact is closed with the static end part and an opening position where the first movable contact is separated from the static end part; and the second movable end part comprises a second movable contact, and the second movable contact is arranged in the second arc extinguishing chamber and provided with a closing position where the second end part is closed with the static end part and an opening position where the second movable end part is separated from the static end part. With the adoption of the technical scheme provided by the invention, the problems that a single-break vacuum arc extinguishing chamber in the prior art cannot make capacitive switching and short-circuit fualt switching-off well compatible.
Description
Technical field
The present invention relates to electrical equipment, in particular to a kind of vacuum interrupter and method of operation thereof.
Background technology
At present, press in electrical equipment in 10 ~ 35kV, vacuum interrupter has been widely used in the middle of the switching operation of reactive power compensation device for capacitor, and frequent operation, annual number of operations can reach 300 ~ 700 times.
Existing vacuum interrupter mainly comprises two classes:
One class is capacitive switching Special vacuum arc control device, is characterized in that arc control device adopt single break to carry out switching, the resistance to ablation of contact material, and contact can bear the shove melting welding that brings of 4250Hz, 20kA high frequency in the process of closing and destroy.Contact can tolerate the System recover voltage effect being superimposed with DC component after disconnecting, and switching repeated breakdown probability is in such cases low, usually can reach C2 grade standard.But such vacuum interrupter does not have and cut-offs function under short circuit fault condition, and capacitive drop-out current is also very little, and rated back-to-back capacity bank breaking current is generally not more than 400A.
Another kind of is take into account the capacitive switching vacuum interrupter that short trouble cut-offs, and is characterized in that arc control device also carry out switching by single break, but its contact material adopting break performance excellent, system be short-circuited fault time there is short circuit current break function.Compare last class vacuum interrupter, its capacitive drop-out current is higher.But its shortcoming shares a fracture because short trouble cut-offs with the operation of capacitive switching, cause the contact surface of arc control device very easily destroyed, increase contact surface field emission coefficient, make to carry out being easier to when normal capacity current cut-offs repeated breakdown occurs subsequently, produce overvoltage, this causes very large threat to the safe operation of power capacitor reactive compensation installation and electric power system, and to carry out normal capacitive switching frequency also very limited simultaneously.
The useful life of vacuum interrupter is relevant with its function, in fact when carrying out capacitor group switching operation, vacuum interrupter running current is capacitive load currents, capacitive load is cut-off operation and is almost accounted for whole switch life (closing a point number of times), and the probability that short trouble drop-out current occurs is very little.
Along with power system reactive power compensation problem is outstanding day by day, the switching operation that vacuum interrupter is used for Capacitor banks is more frequent, also improves constantly the requirement of vacuum interrupter short circuit current connecting-disconnecting function simultaneously.Analyze according to function examination and operation lifetime, capacitor group switching vacuum extinction chamber traditional at present cannot take into account capacitive switching preferably and short trouble cut-offs, and therefore needs the technical merit improving vacuum interrupter to meet corresponding requirements.
Summary of the invention
Main purpose of the present invention is to provide a kind of vacuum interrupter and method of operation thereof, cannot take into account with the vacuum interrupter solving single break in prior art the problem that capacitive switching and short trouble cut-off preferably.
To achieve these goals, according to an aspect of the present invention, provide a kind of vacuum interrupter, comprising: shell; Quiet end, quiet end is connected with shell to form the first separate arc extinguishing chamber and the second arc extinguishing chamber; First moved end portion, the first moved end portion comprises the first moving contact, and it is indoor that the first moving contact is positioned at the first arcing chamber, the first moving contact have with closing position during quiet closed end and with open position during quiet end separating; Second moved end portion, the second moved end portion comprises the second moving contact, and it is indoor that the second moving contact is positioned at the second arcing chamber, the second moving contact have with closing position during quiet closed end and with open position during quiet end separating.
Further, quiet end comprises quiet end terminal pad, the first fixed contact and the second fixed contact, first fixed contact is arranged on the first side of quiet end terminal pad, second fixed contact is arranged on the second side of quiet end terminal pad, quiet end terminal pad is connected with shell, it is indoor that first fixed contact is positioned at the first arcing chamber, and it is indoor that the second fixed contact is positioned at the second arcing chamber, and the first fixed contact is electrically connected with the second fixed contact.
Further, shell comprises upper end cover, enclosure body and bottom end cover, upper end cover lid is located at one end of enclosure body, upper end cover, enclosure body and quiet end terminal pad form the first arc extinguishing chamber, bottom end cover lid is located at the other end of enclosure body, and bottom end cover, enclosure body and quiet end terminal pad form the second arc extinguishing chamber.
Further, vacuum interrupter also comprises: the first radome, and it is indoor that the first radome is positioned at the first arcing chamber, and the first end of the first radome is connected to the inner side of upper end cover, and when the first moving contact is in open position, the first moving contact is positioned at the first radome; Secondary shielding cover, it is indoor that secondary shielding cover is positioned at the first arcing chamber, the first end of secondary shielding cover is connected on quiet end terminal pad, secondary shielding cover is around the first fixed contact, second end of secondary shielding cover and the second end of the first radome are oppositely arranged, and have gap between the second end of secondary shielding cover and the second end of the first radome to form fixing fracture.
Further, vacuum interrupter also comprises the 3rd radome, and the end of the 3rd radome is connected to the inner side of upper end cover, and the 3rd radome extends between enclosure body and the first radome.
Further, vacuum interrupter also comprises the 4th radome, and it is indoor that the 4th radome is positioned at the second arcing chamber, and the 4th radome is connected to the inner side of enclosure body, and the second fixed contact and the second moving contact are all positioned at the 4th radome.
Further, vacuum interrupter also comprises the 5th radome, and the first end of the 5th radome is connected to the inner side of bottom end cover, and the second end of the 5th radome extends between enclosure body and the second moved end portion.
Further, the first moved end portion also comprises the first moving conductive rod, and the first end of the first moving conductive rod is through upper end cover, and the first moving contact is connected to the second end of the first moving conductive rod; Second moved end portion also comprises the second moving conductive rod, the first end of the second moving conductive rod is through bottom end cover, and the bearing of trend of the bearing of trend of the first end of the second moving conductive rod and the first end of the first moving conductive rod away from, the second moving contact is connected to the second end of the second moving conductive rod.
Further, vacuum interrupter also comprises the first bellows and the second bellows, and the first bellows-sheathed is located on the first moving conductive rod, and the end of the first bellows is connected with upper end cover, second bellows-sheathed is located on the second moving conductive rod, and the end of the second bellows is connected with bottom end cover.
Further, quiet end also comprises quiet end conductive seat, and quiet end conductive seat is embedded on quiet end terminal pad, and the first fixed contact is connected on the first side of quiet end conductive seat, and the second fixed contact is connected on the second side of quiet end conductive seat.
According to a further aspect in the invention, provide a kind of method of operation of vacuum interrupter, when aforesaid vacuum interrupter is carried out the switching operation of capacity load as electric reactive compensating device, when it normally works, the order of the pass closing operation of capacitive load is: first the second moving contact and quiet end are closed a floodgate, then close a floodgate with conducting vacuum interrupter by the first moving contact and quiet end; The order cut-offfing operation of its capacitive load is: first by the first moving contact and quiet end separating brake, then vacuum interrupter is cut-off operation to complete by the second moving contact and quiet end separating brake.
According to a further aspect in the invention, provide a kind of method of operation of vacuum interrupter, using aforesaid vacuum interrupter as electric reactive compensating device, when circuit system occurs that short trouble need cut-off, the order of operation of cut-offfing of vacuum interrupter is: first by the second moving contact and quiet end separating brake, then the first moving contact and quiet end separating brake are cut-off operation with what complete vacuum interrupter.
Apply technical scheme of the present invention, this vacuum interrupter comprises quiet end, the first moved end portion and the second moved end portion, like this, the first fracture is formed between first Bu Yujing end, moved end, form the second fracture between second Bu Yujing end, moved end, wherein, the first moved end portion has the first moving contact, second moved end portion has the second moving contact, and vacuum interrupter is by the first moving contact, connection between the second moving contact and quiet end and conducting.Apply technical scheme of the present invention, this vacuum interrupter can be widely used in the occasion of power system reactive power compensation capacitor group switching, there is the function of cut-offfing short-circuit current simultaneously, make vacuum interrupter of the present invention have capacitive load switching to stablize, short circuit current cut-offs the advantages such as reliable, and this vacuum interrupter has wide application by power system reactive power compensation field.
Accompanying drawing explanation
The Figure of description forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 shows the internal structure schematic diagram of the first embodiment according to vacuum interrupter of the present invention;
Fig. 2 shows the internal structure schematic diagram of the second embodiment according to vacuum interrupter of the present invention;
Fig. 3 shows the operating sequence schematic diagram of application vacuum interrupter of the present invention when Capacitor banks drops into;
Fig. 4 shows the operating sequence schematic diagram of application vacuum interrupter of the present invention when Capacitor banks cuts off;
Fig. 5 shows the operating sequence schematic diagram of application vacuum interrupter of the present invention when short trouble cut-offs.
Wherein, above-mentioned accompanying drawing comprises the following drawings mark:
11, upper end cover; 12, enclosure body;
13, bottom end cover; 20, quiet end;
21, quiet end terminal pad; 22, the first fixed contact;
23, the second fixed contact 24, quiet end conductive seat;
30, the first moved end portion; 31, the first moving contact;
32, the first moving conductive rod; 40, the second moved end portion;
41, the second moving contact; 42, the second moving conductive rod;
51, the first radome; 52, secondary shielding cover;
53, the 3rd radome; 54, the 4th radome;
55, the 5th radome; 61, the first bellows;
62, the second bellows.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
As depicted in figs. 1 and 2, the invention provides a kind of vacuum interrupter.This vacuum interrupter comprises shell, quiet end 20, first moved end portion 30 and the second moved end portion 40, wherein, quiet end 20 is connected with shell to form the first separate arc extinguishing chamber and the second arc extinguishing chamber, first moved end portion 30 comprises the first moving contact 31, it is indoor that first moving contact 31 is positioned at the first arcing chamber, first moving contact 31 has closing position when closing with quiet end 20, and the open position of the first moving contact 31 when being separated with quiet end 20, second moved end portion 40 comprises the second moving contact 41, it is indoor that second moving contact 41 is positioned at the second arcing chamber, second moving contact 41 has closing position when closing with quiet end 20, and second open position that be separated with quiet end 20 of moving contact 41.
Like this, between the first moved end portion 30 and quiet end 20, form the first fracture, between the second moved end portion 40 and quiet end 20, form the second fracture, vacuum interrupter conducting by the connection between the first moving contact 31, second moving contact 41 and quiet end 20.Apply technical scheme of the present invention, coordinated with cut-offfing by closing of the different order between the first fracture and the second fracture, capacitive load switching and short trouble can be taken into account preferably cut-off function (when vacuum interrupter needs to be connected electric equipment or conducting loop, vacuum interrupter is realized by the first moving contact 31 and the connection of quiet end 20, second moving contact 41 with quiet end 20; When vacuum interrupter needs excision electric equipment or cutoff circuit, by the first moving contact 31 and quiet end 20, second moving contact 41 with between quiet end 20 cut-off to coordinate realize).This vacuum interrupter can be widely used in power system reactive power compensation capacitor group switching occasion, there is the function of cut-offfing short-circuit current simultaneously, this vacuum interrupter is had, and capacitive load switching is stable, short circuit current cut-offs the advantages such as reliable, and this vacuum interrupter has wide application by power system reactive power compensation field.
In the present invention, quiet end 20 comprises quiet end terminal pad 21 (in order to meet quiet end terminal pad 21 pairs of intensity, the requirement such as gassiness and welded seal, quiet end terminal pad 21 is manufactured by metal material, and meet high temperature resistant requirement), first fixed contact 22 and the second fixed contact 23, first fixed contact 22 is arranged on the first side of quiet end terminal pad 21, second fixed contact 23 is arranged on the second side of quiet end terminal pad 21, quiet end terminal pad 21 is connected with shell, it is indoor that first fixed contact 22 is positioned at the first arcing chamber, it is indoor that second fixed contact 23 is positioned at the second arcing chamber, and the first fixed contact 22 is electrically connected with the second fixed contact 23.Further, the first fixed contact 22 and the first moving contact 31 all adopt C
uw material, the second fixed contact 23 and the second moving contact 41 all adopt C
uc
rmaterial.
First moving contact 31 and the first fixed contact 22 adopt the C of resistance to ablation
uw material, its objective is because when the first fracture will perform normal work, capacitive load closes closing operation, vacuum interrupter is closing capacitive load especially in Capacitor banks process back-to-back, the high frequency that can produce amplitude very high is through-flow, the level of 20kA, 4250Hz can be reached, when closing, prebreakdown electric arc is understood Partial ablation, is heated the contact surface of the first moving contact 31 and the first fixed contact 22, makes, during contact closure, melting welding occurs, and therefore adopts C
uw material occurs to prevent melting welding.Simultaneously after capacity current cut-offs end, C
uw material has again stronger voltage endurance, contributes to bearing the System recover voltage that is superimposed with DC component and shoves and the overvoltage that produces because closing, reducing the probability cut-offfing repeated breakdown.
Second moving contact 41 and the second fixed contact 23 adopt C
uc
rmaterial, its object is to high-performance contact material is that the vacuum interrupter electric current core of cut-offfing is with crucial.C
uc
rmaterial is as the contact material of break performance excellence, and in high-current on-off process, arc current is at contact surface ablation C
u, C
rparticle dissolves isotropism.Arc temperature is higher, C
rat C
uin dissolving more, but arrived certain temperature range C
rdissolving reach balance, at this moment the molten hole of contact surface is very shallow.At cooling and C when solidifying
rvery even again, can not form red-hot spot, correspondingly the medium recovery speed of contact gap is fast, and arc extinguishing ability is strong, therefore contributes to the connecting-disconnecting function improving big current.
Quiet end 20 also comprises quiet end conductive seat 24, quiet end conductive seat 24 is embedded on quiet end terminal pad 21 (quiet end conductive seat 24 of the present invention can be hardwares integrally with quiet end terminal pad 21), first fixed contact 22 is connected on the first side of quiet end conductive seat 24, and the second fixed contact 23 is connected on the second side of quiet end conductive seat 24.By being connected to the electrical connection of quiet end terminal pad 21 directly inlaying quiet end conductive seat 24 and realizing between the first fixed contact 22 and the second fixed contact 23, such set-up mode simplifies the conducting structure of vacuum interrupter, is also conducive to the Miniaturization Design realizing vacuum interrupter.
Particularly, shell comprises upper end cover 11, enclosure body 12 and bottom end cover 13, upper end cover 11 lid is located at one end of enclosure body 12, bottom end cover 13 lid is located at the other end of enclosure body 12, wherein, upper end cover 11, enclosure body 12 and quiet end terminal pad 21 form the first arc extinguishing chamber, and bottom end cover 13, enclosure body 12 and quiet end terminal pad 21 form the second arc extinguishing chamber.Enclosure body 12 is the porcelain shell of ceramic material, and the end cap that upper end cover 11 and bottom end cover 13 manufacture for metal material.Upper end cover 11 of the present invention and bottom end cover 13 utilize special material soldering in enclosure body 12, thus the sealing realized between upper end cover 11 and enclosure body 12 and between bottom end cover 13 and enclosure body 12, to ensure the vacuum degree of the first arc extinguishing chamber and the second arcing chamber indoor.
In the present invention, enclosure body 12 is drum, and the first arc extinguishing chamber of the indoor formation of vacuum extinction and the second arc extinguishing chamber are symmetrically arranged relative to quiet end 20.
As shown in Figure 1, it illustrates the structural representation of the first embodiment of vacuum interrupter of the present invention.In the present embodiment, columnar structured (enclosure body 12 is the porcelain shell of ceramic material) that enclosure body 12 is structure as a whole, quiet end terminal pad 21 is connected on the inwall of enclosure body 12, thus the arc extinguishing chamber of the enclosure body 12 of integrative-structure is separated into the first separate arc extinguishing chamber and the second arc extinguishing chamber.
As shown in Figure 2, it illustrates the structural representation of the second embodiment of vacuum interrupter of the present invention.The difference of the second embodiment and the first embodiment is following structure.Enclosure body 12 comprises two shapes, first cylinder all identical with size and the second cylinder (the first cylinder and the second cylinder are the porcelain shell of ceramic material), the external diameter of quiet end terminal pad 21 is equal with the external diameter of enclosure body 12 (the first cylinder and the second cylinder), first cylinder and the second cylinder are connected to the both sides of quiet end terminal pad 21, wherein, between first cylinder and quiet end terminal pad 21, and second cylinder special brazing material can be utilized to weld with the connection between quiet end terminal pad 21, thus ensure the vacuum degree of the first arc extinguishing chamber and the second arcing chamber indoor formed, also otherwise (can require that connected mode herein meets seal request, and require the connecting material of connected mode or syndeton high temperature resistant) be tightly connected.Like this, between upper end cover 11, first cylinder and quiet end terminal pad 21, form the first arc extinguishing chamber, between bottom end cover 13, second cylinder and quiet end terminal pad 21, form the second arc extinguishing chamber.Second embodiment is all identical with all the other structure element of the first embodiment.
Particularly, vacuum interrupter also comprises the first radome 51 and secondary shielding cover 52, wherein, it is indoor that first radome 51 is positioned at the first arcing chamber, the first end of the first radome 51 is connected to the inner side of upper end cover 11, when the first moving contact 31 is in open position, first moving contact 31 is positioned at the first radome 51, and (the first radome 51 is for cylindric, first moved end portion 30 is surrounded), it is indoor that secondary shielding cover 52 is positioned at the first arcing chamber, the first end of secondary shielding cover 52 is connected on quiet end terminal pad 21, secondary shielding cover 52 is centered around the outside of the first fixed contact 22, second end of the first radome 51 and the second end of secondary shielding cover 52 are oppositely arranged, and (namely the first radome 51 is all fixedly installed with secondary shielding cover 52 to form fixing fracture to have gap between the second end of the second end of secondary shielding cover 52 and the first radome 51, thus define fixing fracture).When the first fracture produces arc erosion; first moving contact 31 and the first fixed contact 22 easily produce splatter thing; when these splatter things are splashed on the inwall of enclosure body 12; meeting causes pollution in varying degrees to enclosure body 12; in order to avoid or reduce this pollution; thus the first radome 51 and secondary shielding cover 52 is utilized to protect, thus the splashing of barrier metal splash.In addition, when the first moving contact 31 and the first fixed contact 22 separated after (the first fracture disconnects prior to the second fracture), stronger electric field can be produced between the first moving contact 31 and the first fixed contact 22, likely cause the danger of cut-offfing rear repeated breakdown.In order to avoid the generation of this kind of dangerous situation, utilize the first radome 51 with secondary shielding cover 52 to shift electric field, namely after being provided with the first radome 51, secondary shielding cover 52, electric field between original first moving contact 31 and the first fixed contact 22 is transferred on the fixing fracture formed between the first radome 51 and secondary shielding cover 52 like this, contribute to the electric Field Optimization between the first moving contact 31 and the first fixed contact 22.
Preferably, vacuum interrupter also comprises the 4th radome the 54, four radome 54 and is positioned at the second arcing chamber indoor, and the 4th radome 54 is connected to the inner side of bottom end cover 13, and the second fixed contact 23 and the second moving contact 41 are all positioned at the 4th radome 54.When second fracture disconnect and cause produce splatter thing between the second moving contact 41 and the second fixed contact 23 time; the 4th radome 54 is utilized to protect; thus barrier metal splash is splashed on the inwall of enclosure body 12; prevent in interrupting process; enclosure body 12 causes flashover breakdown because of the splash of red-hot metal residues particle, causes failure of interruption.
As depicted in figs. 1 and 2, the first end that vacuum interrupter also comprises the 3rd radome the 53, three radome 53 is connected to inside upper end cover 11, and the second end of the 3rd radome 53 extends between enclosure body 12 and the first radome 51.Further, the first end that vacuum interrupter also comprises the 5th radome the 55, five radome 55 is connected to the inner side of bottom end cover 13, and the second end of the 5th radome 55 extends between enclosure body 12 and the second moved end portion 40.Because upper end cover in vacuum interrupter 11 and the weld of enclosure body 12 and the weld of bottom end cover 13 and enclosure body 12 belong to vacuum-ceramic-metal three-phase medium intersection, electric field concentrates distortion, for optimizing the electric field of this three-phase medium intersection, be respectively arranged with the 3rd radome 53 and the 5th radome 55 in vacuum interrupter upper and lower end parts, avoid electric field distortion and causing herein to insulate unsuccessfully.
In order to the conduction connecting structure of further improved vacuum arc control device, the mode of operation be turned on or off of improved vacuum arc control device, therefore, first moved end portion 30 also comprises the first moving conductive rod 32, the first end of the first moving conductive rod 32 is through upper end cover 11, first moving contact 31 is connected to the second end of the first moving conductive rod 32, second moved end portion 40 also comprises the second moving conductive rod 42, the first end of the second moving conductive rod 42 is through bottom end cover 13, and the bearing of trend of the first end of the bearing of trend of the first end of the second moving conductive rod 42 and the first moving conductive rod 32 mutually away from, second moving contact 41 is connected to the second end of the second moving conductive rod 42.
In order to the vacuum degree of the first arc extinguishing chamber and the second arcing chamber indoor that can ensure vacuum interrupter better, thus improve the application of vacuum interrupter under more voltage levels better, vacuum interrupter also comprises the first bellows 61 and the second bellows 62, first bellows 61 is set on the first moving conductive rod 32, and the end of the first bellows 61 is connected with upper end cover 11, second bellows 62 is set on the second moving conductive rod 42, and the end of the second bellows 62 is connected with bottom end cover 13.Vacuum interrupter of the present invention carries out further airtight sealing to the gap between the first moving conductive rod 32 and upper end cover 11, the second bellows 62 to the gap between the second moving conductive rod 42 and bottom end cover 13 by the first bellows 61, make the first moving conductive rod 32 and the second moving conductive rod 42 also can ensure good sealing effectiveness in the process of movement, realize the Absolute truth reciprocal of duty cycle of the arc extinguishing chamber of vacuum interrupter.
According to a further aspect in the invention, a kind of method of operation of vacuum interrupter is provided.When aforesaid vacuum interrupter is carried out the switching operation of capacity load as electric reactive compensating device, when it normally works, the order of the pass closing operation of capacitive load is: first closed a floodgate with quiet end 20 by the second moving contact 41, then closes a floodgate with conducting vacuum interrupter by the first moving contact 31 with quiet end 20; Its normally work time capacitive load the order cut-offfing operation be: first by the first moving contact 31 and quiet end 20 separating brake, then vacuum interrupter is cut-off operation to complete by the second moving contact 41 and quiet end 20 separating brake.
As shown in Figure 3, vacuum interrupter is by the initial condition of the disconnection of a in Fig. 3, first the second moving contact 41 and the second fixed contact 23 close a floodgate, thus the closure state of b in arrival Fig. 3, then the first moving contact 31 and the first fixed contact 22 close a floodgate, to complete the pass closing operation of vacuum interrupter, closure state as shown in c in Fig. 3.
As shown in Figure 4, vacuum interrupter is by the initial condition of the combined floodgate of a in Fig. 4, first the first moving contact 31 and the first fixed contact 22 separating brake, thus the fracture state of b in arrival Fig. 4, then the second moving contact 41 and the second fixed contact 23 separating brake, operation is cut-off, off-state as shown in c in Fig. 4 with what complete vacuum interrupter.Capacity current flows through and just forms vacuum arc when the first fracture of separating brake, and the effective value of capacitive drop-out current is generally hundred amperes of levels, and electric arc is in diffusion state.When the first fracture arcing terminates, and after arc, media recovery process successfully can tolerate the effect of the interchange recovery voltage being superimposed with DC component, represents that capacity current cut-offs successfully, as shown in b in Fig. 4.Then the second fracture carries out separating brake to complete whole sub-switching operation.
According to another aspect of the invention, a kind of method of operation of vacuum interrupter is additionally provided.Using aforesaid vacuum interrupter as electric reactive compensating device, when circuit system occurs that short trouble need cut-off, the order of operation of cut-offfing of vacuum interrupter is: first by the second moving contact 41 and quiet end 20 separating brake, then the first moving contact 31 and quiet end 20 separating brake are cut-off operation with what complete vacuum interrupter.
As shown in Figure 5, vacuum interrupter is by the initial condition of the combined floodgate of a in Fig. 5, first the second moving contact 41 and the second fixed contact 23 separating brake, thus the off-state of b in arrival Fig. 5, then the first moving contact 31 and the first fixed contact 22 separating brake, operation is cut-off, off-state as shown in c in Fig. 5 with what complete vacuum interrupter.Short circuit current can reach tens kiloamperes usually, and electric current flows through and just forms initial Metal Melting bridge when the second fracture of separating brake, and after the fusing of Metal Melting bridge, bridge column vacuum arc is formed, and the increase afterwards with arc current develops into diffusion state or gathers state vacuum current.Finally when the second fracture arcing terminates, and after arc, media recovery process successfully can tolerate transient recovery voltage TRV effect, represents that short circuit current cut-offs successfully, as shown in b in Fig. 5.Then, the first fracture carries out separating brake to complete whole sub-switching operation.
Figure 3 shows that the vacuum interrupter of application first embodiment carries out the schematic diagram of closing operation, when the vacuum interrupter of application second embodiment carries out closing operation, its closing operation method is identical with the vacuum interrupter of application the first embodiment.
Fig. 4 and Figure 5 shows that the vacuum interrupter of application first embodiment carries out the schematic diagram of sub-switching operation, when the vacuum interrupter of application second embodiment carries out sub-switching operation, its sub-switching operation method is identical with the vacuum interrupter applying the first embodiment.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. a vacuum interrupter, is characterized in that, comprising:
Shell;
Quiet end (20), described quiet end (20) is connected with described shell to form the first separate arc extinguishing chamber and the second arc extinguishing chamber;
First moved end portion (30), described first moved end portion (30) comprises the first moving contact (31), it is indoor that described first moving contact (31) is positioned at described first arcing chamber, closing position when described first moving contact (31) has closed with described quiet end (20) and open position when being separated with described quiet end (20);
Second moved end portion (40), described second moved end portion (40) comprises the second moving contact (41), it is indoor that described second moving contact (41) is positioned at described second arcing chamber, closing position when described second moving contact (41) has closed with described quiet end (20) and open position when being separated with described quiet end (20).
2. vacuum interrupter according to claim 1, it is characterized in that, described quiet end (20) comprises quiet end terminal pad (21), first fixed contact (22) and the second fixed contact (23), described first fixed contact (22) is arranged on the first side of described quiet end terminal pad (21), described second fixed contact (23) is arranged on the second side of described quiet end terminal pad (21), described quiet end terminal pad (21) is connected with described shell, it is indoor that described first fixed contact (22) is positioned at described first arcing chamber, it is indoor that described second fixed contact (23) is positioned at described second arcing chamber, and described first fixed contact (22) is electrically connected with described second fixed contact (23).
3. vacuum interrupter according to claim 2, it is characterized in that, described shell comprises upper end cover (11), enclosure body (12) and bottom end cover (13), described upper end cover (11) lid is located at one end of described enclosure body (12), described upper end cover (11), described enclosure body (12) and described quiet end terminal pad (21) form described first arc extinguishing chamber, described bottom end cover (13) lid is located at the other end of described enclosure body (12), described bottom end cover (13), described enclosure body (12) and described quiet end terminal pad (21) form described second arc extinguishing chamber.
4. vacuum interrupter according to claim 3, is characterized in that, described vacuum interrupter also comprises:
First radome (51), it is indoor that described first radome (51) is positioned at described first arcing chamber, the first end of described first radome (51) is connected to the inner side of described upper end cover (11), when described first moving contact (31) is in described open position, described first moving contact (31) is positioned at described first radome (51);
Secondary shielding cover (52), it is indoor that described secondary shielding cover (52) is positioned at described first arcing chamber, the first end of described secondary shielding cover (52) is connected on described quiet end terminal pad (21), described secondary shielding cover (52) is around described first fixed contact (22), second end of described secondary shielding cover (52) and the second end of described first radome (51) are oppositely arranged, and have gap between the second end of the second end of described secondary shielding cover (52) and described first radome (51) to form fixing fracture.
5. vacuum interrupter according to claim 4, it is characterized in that, described vacuum interrupter also comprises the 3rd radome (53), the end of described 3rd radome (53) is connected to the inner side of described upper end cover (11), and described 3rd radome (53) extends between described enclosure body (12) and described first radome (51).
6. vacuum interrupter according to claim 3, it is characterized in that, described vacuum interrupter also comprises the 4th radome (54), it is indoor that described 4th radome (54) is positioned at described second arcing chamber, described 4th radome (54) is connected to the inner side of described enclosure body (12), and described second fixed contact (23) and described second moving contact (41) are all positioned at described 4th radome (54).
7. vacuum interrupter according to claim 6, it is characterized in that, described vacuum interrupter also comprises the 5th radome (55), the first end of described 5th radome (55) is connected to the inner side of described bottom end cover (13), and the second end of described 5th radome (55) extends between described enclosure body (12) and described second moved end portion (40).
8. vacuum interrupter according to claim 3, is characterized in that,
Described first moved end portion (30) also comprises the first moving conductive rod (32), the first end of described first moving conductive rod (32) is through described upper end cover (11), and described first moving contact (31) is connected to the second end of described first moving conductive rod (32);
Described second moved end portion (40) also comprises the second moving conductive rod (42), the first end of described second moving conductive rod (42) is through described bottom end cover (13), and the bearing of trend of the bearing of trend of the first end of described second moving conductive rod (42) and the first end of described first moving conductive rod (32) away from, described second moving contact (41) is connected to the second end of described second moving conductive rod (42).
9. vacuum interrupter according to claim 8, it is characterized in that, described vacuum interrupter also comprises the first bellows (61) and the second bellows (62), described first bellows (61) is set on described first moving conductive rod (32), and the end of described first bellows (61) is connected with described upper end cover (11), described second bellows (62) is set on described second moving conductive rod (42), and the end of described second bellows (62) is connected with described bottom end cover (13).
10. vacuum interrupter according to claim 2, it is characterized in that, described quiet end (20) also comprises quiet end conductive seat (24), described quiet end conductive seat (24) is embedded on described quiet end terminal pad (21), described first fixed contact (22) is connected on the first side of described quiet end conductive seat (24), and described second fixed contact (23) is connected on the second side of described quiet end conductive seat (24).
The method of operation of 11. 1 kinds of vacuum interrupters, is characterized in that,
When vacuum interrupter according to any one of claim 1 to 10 is carried out the switching operation of capacitive load as electric reactive compensating device, when it normally works, the order of the pass closing operation of capacitive load is: first described second moving contact (41) and described quiet end (20) are closed a floodgate, then closes a floodgate with vacuum interrupter described in conducting by described first moving contact (31) and described quiet end (20);
Its normally work time capacitive load the order cut-offfing operation be: first will described first moving contact (31) and described quiet end (20) separating brake, more described vacuum interrupter is cut-off operation to complete by described second moving contact (41) and described quiet end (20) separating brake.
The method of operation of 12. 1 kinds of vacuum interrupters, is characterized in that,
Using the vacuum interrupter according to any one of claim 1 to 10 as electric reactive compensating device, when circuit system occurs that short trouble need cut-off, the order of operation of cut-offfing of described vacuum interrupter is: first by described second moving contact (41) and described quiet end (20) separating brake, more described first moving contact (31) and described quiet end (20) separating brake are cut-off operation with what complete described vacuum interrupter.
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| CN112582203A (en) * | 2020-11-24 | 2021-03-30 | 平高集团有限公司 | Multifunctional solid-sealed polar pole |
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| CN113130247A (en) * | 2019-12-30 | 2021-07-16 | 西安西电高压开关有限责任公司 | Combined bypass switch |
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