CN1171261C - Long-service silver-saving switch appliance with arc transfer contact - Google Patents
Long-service silver-saving switch appliance with arc transfer contact Download PDFInfo
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- CN1171261C CN1171261C CNB991045807A CN99104580A CN1171261C CN 1171261 C CN1171261 C CN 1171261C CN B991045807 A CNB991045807 A CN B991045807A CN 99104580 A CN99104580 A CN 99104580A CN 1171261 C CN1171261 C CN 1171261C
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Abstract
The present invention relates to a long-service silver-saving switch appliance with an arc transfer contact, which is characterized in that a by-pass circuit comprising the arc contact is used; electric current can be broken only in the by-pass circuit; a diode connected with the arc contact in series is utilized; AC arcs can be extinguished within half cycle. A main contact and an arc contact of a switch are all reliable and durable, and have obvious energy saving effect. The present invention is similar to the gene technology, and can be used from miniature relays of automatic control systems to high-current contactors and from sensitive switches to various high and low pressure switches. The present invention is an update and generation replacing product which has the advantages of low cost, high performance and long service life. The present invention can also open a large market to power electronic devices, and can have corresponding measures and effects in a DC switch.
Description
The present invention relates to the device for switching with arc transfer contact and electronic device arc extinguishing, by arc transfer contact circuit disjunction power supply, closing a floodgate with separating brake can be manually to control to this device for switching, also can be realized by electrically operated institution when separating brake.It is specially adapted to the multiple device for switching that the contact is arranged such as contactor, knife switch, master switch, universal seclector, automatic switch, air switch, limit switch, travel switch, sensitive switch, drum controller, relay, button.
One, technical field
What the present invention described is a kind of new arc-suppressing method of contact switch electrical equipment.With can develop many device for switching.
In the industrial electrical equipment product, the proportion maximum of device for switching accounts for more than 50%.The said device for switching of the present invention, the existing device for switching that belongs to the low-voltage electrical apparatus field also has the device for switching that belongs to the High-Voltage Electrical Appliances field.The said low-voltage electrical apparatus of the present invention comprises 1140v and the following low-voltage electrical apparatus of 1140v; The said High-Voltage Electrical Appliances of the present invention refer to the High-Voltage Electrical Appliances that 1140v is above.
Two, background technology
Contact system, arc quenching system and operating system are the elements of switch.Traditional contact switch electrical equipment except low-power load, when dividing deenergizing, can produce electric arc between contact.Inductive component is big more, electric current is big more, supply voltage is high more, and the arc extinguishing difficulty is also big more, and contact is also many more by the ablation amount that electric arc causes.The arc extinguishing technology is the important component part of contact switch electrical equipment.
The existing high-power shell relay of moulding that is used to cut-off tens peace loads, nominal load at disjunction A C250v, 50A, or during the nominal load of disjunction DC30v, 50A, the reliable make-break capacity of its contact, the electric life of contact, the safe and reliable and contact of moulding shell may produce aspect portions such as melting welding that problem is arranged.In addition, in internal combustion engine drive or battery-driven vehicle, the electric life index of heavy DC switch is not high, can only stand several ten thousand times the circulation of cut-offfing mostly;
Noble metals such as silver are the important materials of making various contacts.Various countries are when making contact switch electrical equipment, and the consumption of noble metal is all very considerable.On the other hand, in the existing device for switching of low-voltage electrical apparatus, in the device for switching of especially big electric current, yet there are no the contact that heat proof materials such as using tungsten or tungsten alloy is made.
In the prior art, existing performance " copper-based non-silver electric contact material " (Chinese patent) close aspect contact resistance, electric conductivity, arc ablation resistance, electric life with silver-based contact.But the toughness of this material and mechanical strength are also undesirable, also should not be used for the bigger contactors of current capacity such as 100A and 150A, and main cause is that contact occurs mechanicalness easily and damages.
In the slidingtype main contact system of high-tension oil switch (oil circuit breaker), for improving the performance of contact arc ablation resistance, the contact that uses combining structure is arranged, adopt the different sections of different material contacts, moving contact part by copper conducting rod part and be positioned at the end, contain arcing contact that gold makes etc. by copper tungsten and partly constitute: in the end of lobe shape fixed contact, at the main position of arc burning, the arcing angle that has arc resistant material to make.When normal "on" position, have only copper conducting rod to contact with lobe shape fixed contact, arcing contact is not partly worked with the arcing angle, so contact resistance is little; During separating brake, the arcing contact of moving contact part is the electric contact piece before separating with fixed contact, and electric arc mainly burns between arcing contact and arcing angle.Low tension switch also has and the similar structure of high-voltage switch gear, and such as in the Direct Action Type contactor of big-and-middle capacity, the extended spot in moving contact, fixed contact end has the structure at iron arc angle, is equivalent to the arcing contact in the high-voltage switch gear.This structure helps improving the performance and the anti-electric arc ability of contact system, but electric arc always reduces the electrical contact performance of this class contact and the electric arc short basic reason of conventional switch electrical equipment electric life always.
In the prior art, in the device for switching of control load on/off, the existing noncontacting switch that is called solid switch.Its work pressure drop ratio contact switch is big, and corresponding heating loss is far longer than contact switch, adds noncontacting switch price height, and current capacity is also limited, so use amount and cut-off capacity and all limited to.In addition, there is small leakage current in noncontacting switch, at gate-dividing state, can not cut off power supply fully, is unfavorable for routine maintenance.
In the prior art, existing Arcless AC Contactor ", claim again " hybrid AC contactor ".Shown in Fig. 1 [switching circuit of hybrid AC contactor], it is in parallel with the main contact that the contact is arranged by thyristor and constitutes, and the main contact of each circuitry phase (1) all is parallel with a pair of antiparallel each other thyristor (2) and (3) or a bidirectional thyristor (4).
There are two subject matters in Arcless AC Contactor.The one, the overload capacity of thyristor is limited, and the overcurrent breaking capacity is poor, in case thyristor punctures, just accidents happened for possibility, so reliability is not enough; The 2nd, thyristor price height, the complete machine cost is unable to come down.In addition, at gate-dividing state, can not cut off power supply fully.Above problems affect the popularization and the development of this product.
In high-altitude and hypobaric (at height above sea level 4000m, air pressure reduce to the sea level about 60%), the extinguishing of electric arc than the following difficulty of normal pressure, the dielectric strength of general electronic corporation also can reduce; In addition, in hypobaric, the effect of cross-ventilation heat radiation descends.So except plateau electrical equipment, the operating altitude of existing general electronic corporation product mostly is limited in below the height above sea level 2500m.
Three, summary of the invention
The object of the present invention is to provide a kind of contact that has, reliable, economic, durable, that performance is good, applied widely device for switching new technology.Make the raising that the electric life of device for switching and main contact can the order of magnitude.After adopting new arc extinguishing measure, make switch realize quick arc extinguishing, thereby bring the update of multiple device for switching, comprise explosion-proof switch, the flame-proof switch of development of new, also comprise the new product that can be used for hypobaric;
The present invention also aims to save the consumption of noble metals such as silver in the switch manufacturing.
Basic measures of the present invention can borrow Fig. 2 [being parallel with the switching circuit of arc transfer contact] to begin explanation, on the main contact (5) of each way switch of energized, electric arc carry circuit in the parallel connection is connected in the arc transfer circuit and is used for " arc transfer contact " (7) of transferred arc.Main contact (5) constitutes " hybrid sets of contacts " with arc transfer contact (7).Main contact system (5) can use existing device for switching, also can redesign; The contact that arc transfer contact system (7) can preferentially use arc resistant material to make, and be added with arc quenching system; Secondly just be to use the contact system of existing product.AC-DC Circuit can both be used this circuit.Main contact can be a single-break, also can be double break point; Arc transfer contact can be a single-break, also can be double break point.
In device for switching of the present invention, during separating brake, arc transfer contact all must just separate after main contact separates.
Adopt the device for switching of Fig. 2, the mechanism of its separating brake arc extinguishing is such: allow different contacts carry out difference in functionality, Each performs its own functions, has complementary advantages.Because main contact is more first separately than arc transfer contact, so when separating brake, current transfer is in the arc transfer circuit, electric arc can not produce on main contact, and only can produce on arc transfer contact, and extinguishes on arc transfer contact.Its effect is, on the arc transfer contact that adopts electric arc resistant material to make, the arc erosion amount of contact will significantly reduce, thus make main contact, arc transfer contact, so that the electric life of whole device for switching all be improved; And the reliability of raising switch.
Can will use the device for switching of Fig. 2 circuit to be called " current interruption switch ", and the contactor in " current interruption switch " is called " current interruption contactor ", by that analogy.
Fig. 2 is an element circuit, such scheme can be recycled and reused in the multi-thread powered switch electrical equipment, such as in device for switching the most general, that exchange phase three-wire three, there are three " hybrid sets of contacts " arranged side by side, control three-phase power line respectively, each sets of contacts all is the separate repetition of Fig. 2 circuit.Identical therewith, hereinafter the Fig. 3 of Jie Shaoing and Fig. 4 can be recycled and reused for multi-thread powered switch electrical equipment equally.
One of key technology of the present invention is to adopt new switching circuit, makes new device for switching have the new mechanism of quick arc extinguishing:
For the control of alternating current circuit, shown in Fig. 3 [switching circuit of half-wave current interruption], go up the two-way arc transfer circuit of going up in parallel at the main contact (5) of connecting main power source, form one group of hybrid sets of contacts.First arc transfer circuit is in series by " arc transfer contact " (7) and diode assembly (6) and forms; Second arc transfer circuit is in series by arc transfer contact (9) and another diode assembly assembly (8) and forms, and (8) should be reverse each other with the polarity of (6).Main contact can be a single-break, also can be double break point; Arc transfer contact can be a single-break, also can be double break point.It also can be that an above connection in series-parallel forms that diode assembly can be one, in diode assembly, can also take the overvoltage protection measure and all press measure.It all is unidirectional that the diode assembly that polarity is opposite each other (6) makes the arc transfer contact of flowing through (7) and the electric current of (9) with (8), promptly there are positive half wave and negative half-wave not, for ease of distinguishing and describing, the arc transfer contact that is connected with diode can be called " half-wave contact "; " half-wave contact " has the branch of " half-wave fixed contact " and " half-wave moving contact ".As long as it is right that the polarity of diode connects, no matter diode is connected on the mains side of contact or the load-side that is connected on contact can; One is connected on mains side; It is also passable that another is connected on load-side.Circuit is certain, and the diode assembly among Fig. 3 also can substitute with the thyristor assembly.The arc transfer circuit is the core of arc quenching system among the present invention, and the arc extinguishing function of cutting off the electricity supply is just finished by it.
During separating brake, in Fig. 3 circuit, its arc extinguishing mechanism is such: allow diode produce the new function of current interruption.Because main contact must separate prior to arc transfer contact, when main contact separately, arc transfer contact also was in closure state in short-term, electric current thereby transfer in the arc transfer circuit, so electric arc can not produce on main contact, and only can produce on arc transfer contact.As long as arc transfer contact in time separately puts in place, because the effect that oppositely ends of diode, in the arc transfer circuit of diode current flow, electric arc will extinguish automatically less than half cycle; After negative half-wave arrived, because the arc transfer contact in another road arc transfer circuit separates, electric arc can't be transferred in another road and burn away.This specific character makes the main contact of switch not have the arc-extinguish chamber also can operate as normal.
Adopt the device for switching break-time and the AC vacuum switch peer of Fig. 3 circuit, as a rule, the current interruption time equals cycle for a short time half.Have that fast, the whole cost of breaking speed is low, performance good, therefore, this The Application of Technology field is widely.
Can will use in the arc transfer circuit of Fig. 3, the device for switching that is connected with diode or thyristor on the half-wave contact is called " half-wave current interruption switch ", and the contactor in " half-wave current interruption switch " is called " half-wave current interruption contactor ", by that analogy.
Meanwhile, " half-wave current interruption switch " can be independent of main contact system and individualism (promptly not wanting the main contact in the circuit), such as being barricaded as accordingly " half-wave current interruption switch " with diode assembly and general relay or universal contactor, under the not overheated prerequisite of diode assembly, just can operate as normal and make contact have the function of quick-break arc.Its effect is to improve the withstand voltage properties of contact system and the useful life that can also improve switch simultaneously.For example, after adopting this technology on the midget relay that can only be used for tens volts of rated voltages of disjunction usually, under the current capacity prerequisite of using full contact (not being superheated to condition with contact), promptly can be used for rated voltage is that 110v, 220v are so that the load of 380v.This technology can adopt on existing sensitive switch or small-sized contact switch equally.In automatic control system, this class " half-wave current interruption switch " has its unique significance because and value.
Different with alternating current circuit, for the control of DC circuit, shown in Fig. 4 [dc switch circuit of current interruption fast], (5) only need one tunnel arc transfer circuit in parallel on the main contact of connection main power source.The arc transfer circuit is by " arc transfer contact " (11) and the electronic power switch device that is in series with it---and turn-off thyristor assembly (10) or field effect transistor assembly (12) constitute.In Fig. 4 circuit, press the flow direction of electric current, "+" is the high potential mark; "-" is the electronegative potential mark.
During separating brake, in the DC circuit of Fig. 4, its arc extinguishing mechanism has identical point with Fig. 3: because main contact must separate prior to arc transfer contact, when main contact separately, arc transfer contact also is in closure state in short-term, electric current thereby transfer in the arc transfer circuit so electric arc can not produce on main contact, and only can produce on arc transfer contact.Be that with the different of Fig. 3 situation the electric arc that is produced is along with the shutoff of thyristor or field effect transistor is just extinguished, thereby makes switch finish the separating brake task on arc transfer contact (11).This scheme can improve the breaking speed of dc switch electrical equipment and the electric life of product.
For the title of the device for switching that adopts Fig. 4 circuit, do not having before the definite title, imitative before, might as well be referred to as " direct current half-wave current interruption switch " temporarily, and the contactor in this switch is called " direct current half-wave current interruption contactor " temporarily, by that analogy.
Adopt the device for switching and the characteristic of correspondence that has that adopts Fig. 3 circuit of Fig. 4 circuit: arc transfer contact can be a single-break, also can be double break point; It also can be that an above connection in series-parallel forms that turn-off thyristor assembly (10) or field effect transistor assembly (12) can be one; " direct current half-wave current interruption switch " can be independent of main contact system and independent the existence equally; On (10) and (12) device, also can take the overvoltage protection measure and all press measure.
With regard to optimizing cooperation, High-Voltage Electrical Appliances and low-voltage electrical apparatus are different:
For kilovolt level electrical equipment and High-Voltage Electrical Appliances, the electric-force gradient in the medium is big, produces electric arc for preventing main contact at the contact eve, and arc transfer contact should be connected earlier than main contact.Adopt this cooperation of electric-linked easy realization.When adopting mechanical linkage, can utilize existing operating means, main contact system and arc transfer contact system are moved simultaneously, on the locus, realize above-mentioned requirements thereby arc transfer contact is connected prior to main contact.Other makes arc transfer contact that long overtravel be arranged, when separating brake, when main contact system and arc transfer contact system trip simultaneously, can make arc transfer contact than main contact after disjunction;
In low-voltage electrical apparatus,, can be described as n line power supply circuits for two-wire or the multi-thread power supply circuits more than the two-wire [such as the circuit that exchanges phase three-wire three power supply, direct current two-wire power supply or interchange two-wire power supply].Having under the situation of protection, can directly receive load to a power line, and only in the power line of (n-1), be connected to hybrid sets of contacts;
For low-voltage electrical apparatus, the following device for switching of 500v particularly, during combined floodgate, arc transfer contact also can be just closed after the main contact closure, and this helps improving the electric life of switch.This optimization can be referred to as low-voltage electrical apparatus " bidirectional optimistic of action sequence ".Can preferentially adopt electric-linkedly, realize that this optimization cooperates:
Can use " current interruption contactor " (or " half-wave current interruption contactor ").Combined floodgate and separating brake with " closing ", " branch " signal controlling " current interruption contactor " (or " half-wave current interruption contactor ") of main contact." current interruption contactor " (or " half-wave current interruption contactor ") can utilize existing contactor to combine, also can adopt the patent of invention (Granted publication CN1025702) of " small universal electromagnet operated at wide voltage range ", manufacture and design special-purpose current interruption contactor and main contact contactor.This " current interruption contactor " has dynamo-electric life-span long, reliable (the static power consumption of electromagnet be'ss little, often has only 0.5 watt～3 watts, and it is good to inhale the counter-force registration property) advantage, both has been applicable to uninterrupted duty, also is applicable to the operating state of frequent operation.
When adopting mechanical linkage, the methods of " bidirectional optimistic of action sequence " of low-voltage electrical apparatus can be diversified.With Fig. 5 [a kind of primary structure of mechanical lock buckle] a kind of frame mode is shown.Have an elongated slot (14) on the push mechanism (13) that drives the main contact action, the operating mechanism of arc transfer contact is promoted by an application of force axle (15), and application of force axle (15) is enclosed within the elongated slot (14).Application of force axle (15) is synchronized with the movement with arc transfer contact, and application of force axle (15) can be a circular shaft, also can be rectangular shaft.Move at push mechanism (13) work combined floodgate (direction: ←) or the separating brake motion (direction: →) time, in the front and back of driven application of force axle (15) motion one section neutral gear arranging all, neutral gear and separating brake neutral gear are referred to as respectively to close a floodgate." bidirectional optimistic " of low-voltage electrical apparatus can be achieved like this: during combined floodgate, utilize the combined floodgate neutral, make the closure of arc transfer contact will lag behind the closure of main contact.
Behind the combined floodgate, the operating mechanism of arc transfer contact is locked by a mechanical lock buckle device, makes arc transfer contact remain on on-state.The mechanical lock buckle device can adopt the semiaxis mechanism in the high-voltage switch gear operating mechanism.The also method that can adopt Fig. 5 to illustrate:
In Fig. 5, rocking arm (17) and securing rod (19) match, and a hook (16) is arranged on the rocking arm (17).A runner can be equipped with in the end of securing rod (19).Rocking arm (17) can be swung around axle (18).Shown in the dotted line among Fig. 5, securing rod (19) is synchronized with the movement with application of force axle (15).When "on" position, securing rod (19) is blocked by hook (16), can not be to the motion of tripping operation direction.
During separating brake, main contact is finished the tripping operation motion eve, along with opening of main contact, reducing of separating brake neutral gear only after the separating brake neutral gear reduces to put in place, is positioned at the driven wheel (20) of push mechanism (13) top, by being positioned at the terminal triangular shape projection (21) of rocking arm (17), make rocking arm (17) can do anticlockwise rotation, thereby unclamp constraint, separate in main contact after making arc transfer contact securing rod (19).
Certainly, elongated slot (14) and application of force axle (15) can transpositions, that is to say, application of force axle (15) on the push mechanism (13) of main contact, application of force axle (15) and main contact interlock; And elongated slot (14) is on the operating mechanism of arc transfer contact.This transposition does not change above-mentioned registration property.When Fig. 2 or Fig. 3 scheme were used for the cam controller of ac motor speed control control, this elongated slot can be a circular arc.
Except the mechanical lock buckle device, can also make the locker of electromechanical integration by magnetic hold mode (permanent magnetism keeps, reverse excitatory release).
In the device for switching that uses Fig. 2, Fig. 3 and Fig. 4, also have following characteristics:
1, allow arc transfer contact that bigger contact resistance is arranged.Arc transfer contact can adopt the made of arc ablation resistance, such as adopting tungsten alloy manufacturings such as tungsten or tungsten-molybdenum alloy, perhaps makes with evanohm.The operating pressure of the comparable use silver-based contact of the end pressure of contact strengthens (50%～200%) and holds concurrently and the effect of its opening velocity of acquisition raising;
2, except " the half-wave current interruption switch " and " direct current half-wave current interruption switch " of little electric current, more than the hundreds of ampere, the big electric current of 400v or 660v " half-wave current interruption switch " and " direct current half-wave current interruption switch ", its arc-extinguish chamber can be without the potter's clay manufacturing, and can adopt, and simplify the structure of arc quenching system as heat resistant plastice manufacturings such as aerogenesis plastics such as melamine or phenolic plastics;
3, because the quick arc extinguishing of energy as long as suitably improve the insulation property and the heat dispersion of being correlated with, just is easy to derive the new product that is applicable to high-altitude and the use of high altitude environment;
4, in traditional product, because of the ablation of electric arc, the rated operational current of contact switch electrical equipment under intermittent periodic duty is than all little tens percentage points under uninterrupted duty; The contact electric life of contact switch electrical equipment often has only the part of mechanical endurance so that less than one of percentage.As CJ20-630 type three-phase ac contactor, the rated operational current under uninterrupted duty is 630A, at the next 500A of reducing to of the intermittent periodic duty of 380V, AC-4 (at 660V time have only 320A); Be 6,000,000 its mechanical endurance, and the electric life of its main contact is 600,000 times under the AC-2 intermittent periodic duty, at following of AC-4 surplus 6,000 times (1 ‰).Adopt the technology of the present invention, easily make the electric life of the electric life, particularly contact of device for switching obtain the raising of the order of magnitude;
5, in existing high-voltage switch gear, the main contact that silver-based material also of no use is made.After adopting the solution of the present invention, can develop the following high-voltage switch gear new product of 6kv and 6kv level earlier.Its main contact can adopt the silver-based material manufacturing.With regard to the highest voltage withstand class of diode or thyristor, though also there is not the above element of 10kv electric pressure and 10kv at present, but, the development that promotes this class power electronic device is also promoted conversely the development of the novel high-pressure switch more than the 10kv along with the appearance and the application of quick arc extinguishing new mechanism;
When 6, making the main contact of traditional product with silver-based material, the money base main contact is an electric interface, is attached on the contact base parts of copper-based material.The thickness of main contact will reduce along with the ablation of electric arc.For this reason, the main contact of conventional switch except to have very big overtravel with compensation because of main contact gradually the thickness of attenuate, main contact must have enough thickness.With three-phase 380V, (A.C. contactor of 600A～630A) is an example, CJ12-600 type rotary type contactor copper-based material the main contact overtravel be 9.5～10.5mm, this is equivalent to the limit electrical wear amount that its main contact allows; The contactor of CJ20-600 type Direct Action Type double break point, the area of every money base main contact all is 18mm * 24mm, and the thickness of every silver-based contact is 3mm, needs 12 dynamic and static contacts altogether, and the silver-based material that each contactor consumed is all very considerable.
By contrast, because there is not the ablation of separating brake electric arc in the main contact of device for switching of the present invention, the electrical wear amount is very little, so can make slim contact replace original thick type contact.During with the silver-based contact of sheet type, its thickness only needs 0.1 to 1.5mm.For the low main contact of frequency of operation, resemble the connector in the High-Voltage Electrical Appliances, get final product copper main contact is silver-plated.Effect is: save noble metal in a large number;
7, because main contact does not produce electric arc, thus can reduce main contact open distance and overtravel.Especially adopt the low-tension switch electric appliance of electrically operated institution, after the opening distance and overtravel and reduce of main contact, the combined floodgate impact strength of main contact will descend greatly, therefore on 100A and the big capacity low pressure contactor more than the 150A, just can select for use " copper-based non-silver electric contact material " to make main contact;
8, adopt the scheme of described Fig. 3 or Fig. 4, such as add with " current interruption contactor " corresponding " half-wave current interruption relay " or " direct current half-wave current interruption relay " after, the aforementioned high-power existing problem of shell relay of moulding just can be readily solved, and can adopt the solution of the present invention, design, produce better high power relay of cost performance and composite type new product;
9, in the sensitive switch of contact is arranged, the actuating mechanism of quick upset is all arranged, actuating mechanism is used so that the contact of sensitive switch in quick disjunction, can also guarantee that contact has enough distances of opening.Meticulousr elastic part is often arranged in the actuating mechanism, and this class actuating mechanism is often malfunctioning because of the heating and the electrical wear of contact easily, so when nominal load, its electric life is very limited.That design is opened for a short time is distance, simple, do not have the button type switch of upset actuating mechanism fast, adds above-mentioned " half-wave current interruption relay " or " direct current half-wave current interruption relay ", just can become all very long novel sensitive switch of mechanical endurance and electric life;
10, owing to the unfavorable factors such as thermal effect of having got rid of arc erosion and electric arc, so, to the main contact system selection of working parameters,, all change to some extent no matter be in low-voltage electrical apparatus neck city or in the High-Voltage Electrical Appliances field:
In the prior art, remove vacuum switch, the way of contact of main contact has a contact, also wired contact; In order to improve the current capacity of contact, also useful braiding flexible cord is that connect, parallel, forms a contact by a plurality of parallel pectination contacts, and structure is complexity, but arc resistant melting welding performance is unsatisfactory.Because the factor of arc erosion resembles switch contacts such as lv contactor, does not all have the contact of plane contact formula.With typical two breakpoint straight type contactors is example, and the contact-making surface of its silver-based contact is all the arcwall face of projection.Real contact area has only the sub-fraction of contact area of base, contact effectively utilize area seldom, the average current that shows as contact is close very low.Several amperes to tens amperes low capacity contact, the average current density of contact often has only every square millimeter of 0.5A～0.8A; The big capacity contact of hundreds of ampere also has only about the 1.5A, seldom has above 2A, and the numerical value of copper base contact is littler.After adopting the present invention, plane contact formula contact that just can be with effect simple in structure, promptly the enveloping surface of main contact-making surface is a plane.Contact-making surface can be a level and smooth plane; The plane that microgroove groove or microgroove grid are arranged on also can the enveloping surface of plane.The latter more is applicable to the large current contact that 100A is above, so that under certain contact pressure and under certain heat loss through conduction area, obtains better contact effect.Plane contact formula contact can reduce contact area significantly, save contact material, and reduces contact temperature rise.The criterion that reduces contact area is, no matter be silver-based contact or copper base contact, the average current density of plane contact formula main contact can be brought up to every square millimeter of 2.1A～10A.
In addition, in the device for switching that the arc transfer circuit is arranged, even the very big main contact system of current capacity also can be cancelled traditional arc quenching system.
11, in using Electromagnetically-operating or electric operating or spring-operated or pneumatically-operated automatic switch, its main contact can adopt plug-type getting type, such as the getting type that resembles bakelite knife switch commonly used; In the high-voltage switch gear of band dolly, with the plug-in connected mode that many lobes are arranged, aforementioned switches also can be used the getting type of this multi-clove type now.
When 12, the present invention was used for high-voltage switch gear, its current interruption switch or half-wave current interruption switch can adopt the trolley type underframe, so that to connecting the main contact switch or break away from the main contact switch, and be convenient to safeguard.
Four, embodiment
The invention will be further described below in conjunction with accompanying drawing and preferred embodiment.
The terminals of load-side (26) also connect the positive pole (hot end) of diode (6); The negative pole (cold end) of diode (6) is received half-wave moving contact (29) by the line that is flexible coupling and is gone up [corresponding to the arc transfer contact (9) of Fig. 3]; Also connect the terminals (24) of mains side with the half-wave fixed contact (28) of half-wave moving contact (29) pairing.
Every road arc transfer contact is all single-break.The all available tungsten alloy material manufacturing of half-wave fixed contact and half-wave moving contact.Be independent of the switch of main contact as design, just with half-wave current interruption contactor when mains switch, contact should be made with silver-based material.
With power supply is three-phase alternating current 380v, and 50Hz, specified breaking current are that the half-wave current interruption contactor of 630A is an example, and clearance between open contacts is 10mm, and overtravel is 3.2mm.The specified suction of keeping of electromagnet is 500N, electromagnet is a tubular concentric type T type electromagnet, two work adhesive faces are arranged, electromagnet external diameter 60mm, high 60mm, closing time≤100 millisecond, power about 1kVA in short-term closes a floodgate, about 3 watts of power consumption when keeping adhesive, the nominal operation frequency is 1200 times/hour.
In Fig. 8 [a kind of moving contact] with compression spring, show the moving a kind of mode that connects unshakable in one's determination of moving contact and electromagnet, can be used for above-mentioned " half-wave current interruption contactor ", also can be used for " main contact contactor ".When being used for half-wave current interruption contactor, contact can be with heat-resisting alloy manufacturings such as wolfram steel; When being used for the main contact contactor, contact can adopt the silver-based material manufacturing of sheet type.There is a bolt (34) at the back side of moving contact.Bolt is with compression spring (35) outward.Also be with sliding stand cover (36) on the bolt in order to compression spring (35).The operating pressure of nut (37) the scalable contact of bolt (34) end also can contact contact or separately simultaneously.Sliding stand cover (36) can use heat resistant plastice manufacturings such as acetal plastic, phenolic plastics or melamine.The sliding stand cover has individual hold-down arm on (36), and securing member (38) is fixed on the hold-down arm on the sliding stand cover (36) on the support that the moving iron core with electromagnet fuses.Among Fig. 8, connect half-wave moving contact (40) by the line that is flexible coupling (39).Also have tripping spring to act on the moving iron core of electromagnet in addition.Like this, during electromagnetic actuation, moving iron core can drive moving contact and finish the motion of closing a floodgate; During the electromagnet outage, by compression spring (35) and tripping spring, make unshakable in one's determination release, thereby contactor is finished the separating brake motion and is remained on gate-dividing state.
The structure of main contact contactor is similar to half-wave current interruption contactor, operation electromagnet (32) the dress main contact system of main contact contactor and the top of main contact protective cover (33).Adopt the main contact of single-break.The basic structure of moving contact as shown in Figure 8, described.On the main contact contactor, use protective cover (33) for the arc-extinguish chamber of getting for traditional contactor.Protective cover can use the manufacturing of phenolic heat resistant plastice, also can use the plastics manufacturing of nonrefractory types such as ABS.
Still with three-phase alternating current 380v, 50Hz, specified breaking current are that the situation of 630A is an example, and the rated current of main contact contactor is 630A.Opening of main contact apart from being 6mm, overtravel is 1.5mm, the contact-making surface of main contact is the thick silver-based contact of a slice 0.8mm.Adopt and embodiment 1 described, structure identical operations electromagnet, the specified suction of keeping of electromagnet is 250N, electromagnet external diameter 55mm, high 48mm, closing time≤100 millisecond, the about 500VA of power that closes a floodgate in short-term, the power consumption when keeping adhesive＜2.5 watt, the nominal operation frequency is 1200 times/hour.
Embodiment 3, in many situations, according to purposes, can select for use existing product to carry out technical combinations, reach application target.When using the present invention program to carry out technical combinations, the bigger room for maneuver is arranged.For example, selecting 380v, 50Hz, rated power is the demonstration test that the phase asynchronous dynamo-electric motivation of 11kw is carried out frequent operation.Select for use rated current be the A.C. contactor (such as CJ20-20 type A.C. contactor) of 20A when the main contact contactor, the small contactor (such as CJ10-10 type contactor) of adapted 10A is used as " half-wave current interruption contactor " and is used in addition.Because six of the main contact less thaies of CJ10-10 are so directly receive a power line in the load.In frequent operation, though on the different contacts of CJ10-10 type contactor, occur solar flare frequently, all flash across, also have little time to form slightly stable electric arc and just disappeared; It is overheated that the 20A diode that does not add radiator does not have yet.Have a power failure and check, the spot of arc erosion is arranged on the contact of CJ10-10 type contactor, but not serious; On the contact of CJ20-20 main contact contactor, do not see tangible electrical wear vestige yet.
Motor for big-and-middle capacity, owing to got rid of the unfavorable factor of electric arc and arc heat effect, thereby can select for use contactor with the same shelves of motor rated current capacity, need not the nargin of current capacity as the main contact contactor, promptly being used in frequent operation, also is like this.Not sacrificing under the preceding topic of reliability, reduced cost of equipment.
For the current interruption contactor,, can produce electric arc though disjunction power is big, but the arc duration is short, and finite energy is so allow to select for use two rated current to equate with the motor rated current, so that have only 1/2nd contactor, connect into one " half-wave current interruption contactor " with lead and use.
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Claims (9)
1. use the device for switching of arc transfer contact and electronic device arc extinguishing, comprise contact system, arc quenching system and operating system, the contact system that it is characterized in that switch is hybrid contact system, the arc transfer circuit that is used for cutting off the electricity supply can be independent device for switching, also can be connected in parallel on the main contact (5), the arc transfer circuit is in series by arc transfer contact and power electronic device.
2. the device for switching with arc transfer contact and electronic device arc extinguishing according to claim 1, it is characterized in that for alternating current circuit, the arc transfer circuit is formed in parallel by two arc transfer circuit, and first arc transfer circuit is in series by " arc transfer contact " (7) and diode assembly (6) and forms; Second arc transfer circuit is in series by arc transfer contact (9) and another diode assembly assembly (8) and forms, and diode assembly (8) should be reverse each other with the polarity of (6).
3. the device for switching with arc transfer contact and electronic device arc extinguishing according to claim 1, it is characterized in that for DC circuit, the electric arc shifting circuit is connected to arc transfer contact (11), is in series with turn-off thyristor assembly (10) or field effect transistor assembly (12) on arc transfer contact.
4. according to claim 1 or claim 2 or the described device for switching with arc transfer contact and electronic device arc extinguishing of claim 3, the contact-making surface that it is characterized in that main contact (5) is level and smooth plane
5. according to claim 1 or claim 2 or the described device for switching with arc transfer contact and electronic device arc extinguishing of claim 3, the contact-making surface that it is characterized in that main contact (5) is the plane that the microgroove groove is arranged on the enveloping surface of plane.
6. according to claim 1 or claim 2 or the described device for switching with arc transfer contact and electronic device arc extinguishing of claim 3, the contact-making surface that it is characterized in that main contact (5) is the plane that the microgroove grid is arranged on the enveloping surface of plane.
7. according to claim 1 or claim 2 or the described device for switching with arc transfer contact and electronic device arc extinguishing of claim 3, it is characterized in that main contact (5) is the silver-base alloy contact of sheet type, its thickness is 0.1 to 0.4mm.
8. according to claim 1 or claim 2 or the described device for switching of claim 3, it is characterized in that main contact (5) is silver-plated copper base contact with arc transfer contact and electronic device arc extinguishing.
9. the device for switching with arc transfer contact and electronic device arc extinguishing according to claim 2 is characterized in that replacing diode assembly (6) and diode assembly (8) with the thyristor assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB991045807A CN1171261C (en) | 1999-04-23 | 1999-04-23 | Long-service silver-saving switch appliance with arc transfer contact |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB991045807A CN1171261C (en) | 1999-04-23 | 1999-04-23 | Long-service silver-saving switch appliance with arc transfer contact |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1271955A CN1271955A (en) | 2000-11-01 |
| CN1171261C true CN1171261C (en) | 2004-10-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB991045807A Expired - Fee Related CN1171261C (en) | 1999-04-23 | 1999-04-23 | Long-service silver-saving switch appliance with arc transfer contact |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1171261C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1234140C (en) * | 2001-11-05 | 2005-12-28 | 刘卫歧 | Cutoff Switch |
| CN201549395U (en) * | 2009-09-16 | 2010-08-11 | 深圳市英赛威科技有限公司 | Mechanical electronic DC switch |
| CN101969006B (en) * | 2010-08-19 | 2013-12-18 | 中国电力科学研究院 | Method for improving converted current switching capability of ultra-high voltage alternating current open isolating switch |
| CN102623220B (en) * | 2011-02-01 | 2016-05-11 | 王海 | High-pressure electronic arc-suppressing switch |
| CN102244507B (en) * | 2011-06-24 | 2013-06-19 | 崔万恒 | High-voltage DC (direct current) switching circuit and switching-on/off method thereof |
-
1999
- 1999-04-23 CN CNB991045807A patent/CN1171261C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1271955A (en) | 2000-11-01 |
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