CN102354638B - Dual-power automatic transfer switch and overload and short-circuit protection method thereof - Google Patents
Dual-power automatic transfer switch and overload and short-circuit protection method thereof Download PDFInfo
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- CN102354638B CN102354638B CN201110204861.8A CN201110204861A CN102354638B CN 102354638 B CN102354638 B CN 102354638B CN 201110204861 A CN201110204861 A CN 201110204861A CN 102354638 B CN102354638 B CN 102354638B
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Abstract
The invention discloses a dual-power automatic transfer switch, which comprises a controller, a transfer mechanism, a contact system and an arc-extinguishing system, and a protective current transformer is arranged on the load circuit of the transfer switch, and is connected with the circuit of the controller. The invention also provides an overload and short-circuit protection method for the dual-power automatic transfer switch. When the technical scheme is adopted, a load can be protected against overloading and short-circuiting, and overload and short-circuit protection can be regulated and switched off; rated short-circuit making capability, rated short-circuit breaking capability and rated short-time current-withstanding capability are achieved; if both overload protection and short-circuit protection are switched off, the dual-power automatic transfer switch is equivalent to a PC-class dual-power automatic transfer switch in order to be applied in a fire protection circuit; the invention embodies the advantages of the ATSE (automatic transfer switching equipment), such as reliability in operation, convenience in model selection, economy and convenience in maintenance; and the dual-power automatic transfer switch and the overload and short-circuit protection method thereof disclosed by the invention realize the normalization and universalization of various classes of ATSE, facilitate the design, production and usage of power systems, and save a large quantity of resources.
Description
Technical field
The invention belongs to the technical field of power equipment, relate to the switchgear of electric power system, more particularly, the present invention relates to a kind of double power supply automatic transfer switch.In addition, the invention still further relates to overload, the short-circuit protection method that this double power supply automatic transfer switch adopts.
Background technology
Double power supply automatic transfer switch (is called again automatic transfer switching electric appliance, hereinafter to be referred as ATSE) be mainly used in two-way electric supply system, its effect is: when power supply breaks down, load circuit is transformed into another (standby) power supply automatically from (a commonly using) power supply.
ATSE is as guaranteeing the important load device for switching of power supply continuously, and GB, IEC, UL have formulated corresponding codes and standards (IEC60947-6-1 has issued second edition in August, 2005), and China is also standard progressively at aspects such as design, manufacture, uses.ATSE, according to standard, has two kinds of ranks of PC level and CB level, and this feature causes user when selecting, and easily causes confusion.
In CNS, by short-circuit capacity, ATSE is divided three classes:
1, PC level: can connect and carry, but be not used in the ATSE of disjunction short circuit current;
2, CB level: be equipped with the ATSE of overcurrent trip, its main contact can be connected and for disjunction short circuit current;
3, CC level: can connect and carry, but be not used in the ATSE of disjunction short circuit current.
Fig. 1 in accompanying drawing, Fig. 2 and Fig. 3 represent respectively the electrical equipment symbol of these three rank ATSE.
And < < China electrical engineering grand ceremony > > is according to architectural feature, again the ATSE on domestic and international market is divided into 7 quasi-representative structures:
The 1st class: PC-1 type: the special-purpose PC level ATSE that is operating as feature with bistable electro-magnet;
The 2nd class: PC-2 type: the derivation type PC level ATSE that two switch combinations of take are feature;
The 3rd class: PC-3 type: take and there is the PC level ATSE that 3 working positions of two groups of moving contacts are feature special use;
The 4th class: PC-4 type: the special-purpose PC level ATSE that single electricity behaviour tape-transport mechanism of take is feature;
The 5th class: CB-1 type: the ATSE being derived from by two MCB circuit breakers (miniature circuit breaker);
The 6th class: CB-2 type: the ATSE that has two MCCB circuit breakers (breaker of plastic casing) to derive from;
The 7th class: CB-3 type: the ATSE being derived from by two ACB circuit breakers (omnipotent breaker).
From using Shang Kan， Europe, region country to adopt CB level ATSE, be master, as the Schneider of German Muller, France; PC level ATSE be take as main in North America (U.S.), East Asia (Japan, Korea S); In Chinese product, CB level and PC level ATSE are widely used.
From using, because CC level is comprised of two contactors, mechanical interlockings, as easy as rolling off a log melting welding, although cheap, safety does not ensure, so mainly ATSE is divided into two large class, i.e. PC level and CB levels on using at present.Its primary structure is generally:
PC level is comprised of electromagnet operating mechanism and custom-designed change over switch body, controller; CB level is comprised of two circuit breakers, operating mechanism, interlocking device and controllers.
Above data shows, ATSE classification is so loaded down with trivial details, use and be subject to again regional impact, and in Chinese Industrial Standards (CIS), ATSE is divided into PC level, three kinds of CB levels, CC level.Manufacturer is when manufacturing a product, want several rank ATSE to do entirely very difficult, production and processing complexity is loaded down with trivial details, the production and sales of all kinds of specification ATSE cause social resources to waste in a large number, very big inconvenience that Ye Gei designing unit and Subscriber Unit have been used type selecting band, so which type of dual-power transfer switch electrical design personnel to select have difference always in circuit.Above situation shows, current ATSE does not meet to a certain extent product and uses generalization, standardized requirement.
From PC level ATSE and the CB level ATSE main distinction:
1, both Machine Design theories are different: CB level is comprised of circuit breaker, and circuit breaker be with breaking arc for appointing, require its mechanical structure to answer rapid-releasing.Thereby there is slide fastener, buckle problem (buckleing again not in place) again in the mechanism of circuit breaker; And PC level product does not exist this aspect problem, therefore, the reliability of PC level product is far above CB level product.
2, both require to have any different to carrying short circuit withstand current: general circuit breaker does not carry short circuit withstand current, belongs to category-A circuit breaker more; 400A and above specified frame size circuit breaker have design carrying short circuit withstand current at present, belong to category-B circuit breaker.Circuit breaker Main Function is load circuit while being short-circuited, when contact is scolded out generation metering function, thus disjunction short circuit current; And PC level ATSE should bear 20Ie and above overload current, can carry specified short time withstand current.
3, the selection of contact material requires different: circuit breaker is often selected silver-colored tungsten, the pairing of silver-colored tungsten carbide material, and this is conducive to breaking arc.But such contact material is oxidizable, standby contact long term exposure outside, easily forms in its surface and hinders conduction, the difficult oxide of removing, and standby contact is once come into operation, and contact temperature raises, and easily causes switch to burn; And PC level ATSE has taken into full account the consequence that contact material oxidation brings.
4, conversion speed is different: PC level ATSE is mechanism owing to there being electromagnet, adopts excitation to drive, and conversion speed is fast, generally, below 300ms, can be used for one-level important load; And CB level duplicate supply generally adopts motor as mechanism, conversion speed is slow, generally more than 1500ms, and can only be for secondary important load.
Summary of the invention
The problem that the present invention solves is to provide a kind of double power supply automatic transfer switch, its objective is and make ATSE become CB level, PC level function integration, even if ATSE possesses the specified short time withstand current ability of the specified short circuit breaking capacity of CB level and the specified making capacity that opens circuit, PC level, and quick conversion performance and the mechanism reliability with PC level simultaneously.
To achieve these goals, the technical scheme that the present invention takes is:
Double power supply automatic transfer switch provided by the present invention; be located on the change-over circuit of two-way power supply; comprise controller, switching mechanism, contact system and arc quenching system; the load circuit of described double power supply automatic transfer switch is provided with protective type CT, and described protective type CT is connected with described controller circuitry.
Described protective type CT is built-in current transformer; its mounting means is: before the gusset piece of the load wiring on change over switch body, establish a cavity; the size of this cavity can be put into described built-in current transformer, and described built-in current transformer is fixedly mounted in this cavity.
Described protective type CT is external current mutual inductor, and its mounting means is: described external current mutual inductor is serially connected on the cable of this external load outgoing line side of change over switch.
Fixed contact in described contact system is the galvanic circle of U-shaped.
The material of the moving contact in described contact system is AgW40, and the material of the fixed contact in described contact system is AgC5.
Or the material of the moving contact in described contact system is AgW70, the material of the fixed contact in described contact system is AgC5.
Between the contact of the two-way power supply of described contact system, by pedestal, separate.
The structure of described arc quenching system is: in arc control device, establish arc quenching plate, lower arc quenching plate, between described upper arc quenching plate and lower arc quenching plate, establish multi-disc arc extinguishing grid pieces; The grid sheet fixed head on described arc control device both sides adopts gas exhausted material; The compound flash barrier of two laminated construction is established in described arc control device outside, and wherein one deck flash barrier in arc control device is provided with a plurality of steam vents, and one deck flash barrier outside arc control device is elastic piece structure wide at the top and narrow at the bottom.
Before described fixed contact, 1.5mm～2mm place arranges arc striking piece, the structure that described arc striking piece is bending, and the direction of this bending is that electric arc is introduced to described arc control device.
The present invention also provides overload, the short-circuit protection method of above-described double power supply automatic transfer switch, and its goal of the invention is identical with technique scheme, and the step of described guard method is:
1, current sample;
2, A/D digital translation;
3, on controller, show current value, then carry out respectively step 4 and step 5;
4, controller judges that whether current value is greater than overload protection set point, if so, enters step 6; If not, return to step 1;
5, controller judges that whether current value is greater than short-circuit protection set point, if so, enters step 6; If not, return to step 1;
6, switching winding action, double power supply automatic transfer switch is in two minutes states;
7, meeting under the condition of double power supply automatic transfer switch normal operation, by manually or by combined floodgate button, double power supply automatic transfer switch is being devoted oneself to work again, returning to step 1.
The present invention adopts technique scheme, can realize overload, short-circuit protection function to load, and adjustable, can close; Possess specified short circuit making capacity and specified short circuit breaking capacity; Overload and short-circuit protection can be turned off, just be equal to PC level double power supply automatic transfer switch, to be applied to fire-fighting loop; The ability that possesses specified short time withstand current; Embody the advantages such as ATSE reliable operation, type selecting be convenient, economic, easy to maintenance; Unification and the generalization of existing all kinds of rank ATSE, facilitate design, manufacture and the use of electric power system, saves a large amount of resources.
Accompanying drawing explanation
Below the expressed content of each width accompanying drawing of this specification and the mark in figure are briefly described:
Electrical equipment symbol in the ATSE that Fig. 1 to Fig. 3 partly relates to for this specification background technology, wherein:
Fig. 1 is PC level electrical equipment symbol;
Fig. 2 is CB level electrical equipment symbol;
Fig. 3 is CC level electrical equipment symbol;
Fig. 4 is overall structure schematic diagram of the present invention;
Fig. 5 is the A-A profile in Fig. 4, embodies ATSE arc quenching system structure and the built-in structure of protective type CT in ATSE;
Fig. 6 is ATSE protective type CT outlet structure schematic diagram;
Fig. 7 is arc control device design schematic diagram;
Fig. 8 is the flash barrier structural representation in arc control device outside;
Fig. 9 is the flash barrier structural representation of arc control device inner side;
Figure 10 is the FB(flow block) of CB level, PC level function integration double power supply automatic transfer switch overload, short-circuit protection method.
In figure, be labeled as:
1, base plate, 2, controller, 3, switching mechanism, 4, protective type CT, 5, phase partition, 6, contact system, 7, current transformer lead-in wire, 8, flash barrier, 9, wire lead slot, 10, flash barrier, 11, arc control device, 12, fixed contact, 13 moving contacts, 14, soft connection, 15, contact plate, 16, built-in current transformer, 17, gusset piece, 18, moving contact, 19, arc striking piece, 20, phase partition, 21, fixed contact, 22, flash barrier, 23, flash barrier, 24, arc control device, 25, moving contact, 26, square shaft, 27, fixed contact, 28, pedestal, 29, square shaft, 30, moving contact, 31, arc striking piece, 32, fixed contact, 33, external current mutual inductor, 34, cable, 35, grid sheet fixed head, 36, upper arc quenching plate, 37, arc extinguishing grid pieces, 38, lower arc quenching plate.
Embodiment
Contrast accompanying drawing below, the description by embodiment, is described in further detail the specific embodiment of the present invention, to help those skilled in the art to have more complete, accurate and deep understanding to inventive concept of the present invention, technical scheme.
Structure of the present invention as expressed in Fig. 4 to Fig. 9, the present invention is a kind of double power supply automatic transfer switch, is located on the change-over circuit of two-way power supply, comprises base plate 1, controller 2, switching mechanism 3, contact system 6 and arc quenching system.Between each phase, adopt phase partition 5, phase partition 20 isolation.
Its middle controller 2 can also form separately Split type structure, just be arranged on cabinet body door.
One, to the controller conventional func relating in the present invention and PC-3 type, have three position mechanisms of three-winding control to carry out brief analysis below:
1, the conventional func of controller 2:
Above two-way power supply great majority are civil power---civil power type.If conventional power supply is civil power, stand-by power supply is generator, and this type is civil power---generator type, is generally the runback mode of hauling oneself willingly into.
2, three position mechanisms that PC-3 type three-winding is controlled:
Take there are two groups of moving contacts, the drive mechanism of special-purpose PC-3 type ATSE that three working positions are feature is basis, has three coils in this structure:
Closing coil: can allow ATSE be operated in conventional power supply or stand-by power supply;
Must guidance coil when guidance coil: ATSE drops into stand-by power supply and closing coil simultaneously electric;
Two sub-coils: make ATSE under load overload, short-circuit conditions, jump to centre position (two minutes positions) from conventional power supply or stand-by power supply.
The three-winding of this structure is contained in switching mechanism 3 inside, can make contact system 6 be in following three kinds of states:
The first state is that ATSE is operated in the state while commonly using power supply: contact system 6 states as shown in Figure 5, now show in mechanism that conventional power supply closes a floodgate;
The second state is the state of ATSE while being operated in stand-by power supply: when closing coil closes a floodgate and guidance coil moment obtains when electric, square shaft 29 clockwise under switching mechanism drives rotates, conventional power supply disconnects, and then square shaft 26 clockwises rotate, stand-by power supply closes, be that in Fig. 5, left side stand-by power supply moving contact 18, fixed contact 21 close, power supply moving contact 13, fixed contact 32 are commonly used separately in the right;
The third state is two minutes states: when switching winding obtains electric time, under the second state, square shaft 29 is motionless, and square shaft 26 inverse clocks rotate; Or the first state lower shaft 26 is motionless, square shaft 29 clockwises rotate, and all make ATSE be in two minutes states, the state that two-way power supply all disconnects.
Three working positions refer to: ATSE is operated in conventional position of source; ATSE is operated in stand-by power supply position; ATSE is operated in Ji Shuanfen position, centre position.
When load is transshipped, short circuit is while surpassing set point, ATSE jumps to two minute positions automatically;
Only have after unloading or short trouble eliminating, just can rework conventional position of source or stand-by power supply position.
Two, technical scheme main points of the present invention:
In order to facilitate the designing unit of electric power system and to consider for user uses, the invention is intended to retain the advantage of PC level, the advantage of CB level is incorporated to PC level, make ATSE become the double power supply automatic transfer switch of CB level, PC level function integration.For realizing this goal of the invention, the technical scheme that the present invention takes is:
As shown in Figure 4, Figure 5 and Figure 6, double power supply automatic transfer switch provided by the present invention, the load circuit of described double power supply automatic transfer switch is provided with protective type CT 4, and described protective type CT 4 is connected with described controller 2 circuit.By 2 pairs of loads of controller transship, short-circuit protection.Described controller 2 sends current sample for receiving protective type CT 4; in controller 2, carry out A/D digital translation; afterwards with controller 2 in the data that arrange carry out logic and compare; judge whether to be greater than overload, short-circuit protection set point and show in real time; make if desired switching winding action, after action, ATSE is in two minute positions.
Deficiency for existing all types of, each rank ATSE; the invention provides CB level as above, PC level function integration double power supply automatic transfer switch; ATSE is realized in the use unified and general; be that ATSE can provide overload, short-circuit protection; the short circuit that possesses CB level divides short ability and the making capacity that opens circuit; meet the specified short time withstand current requirement of PC level; there is quick conversion performance and the mechanism reliability of PC level, thereby realize the advantages such as ATSE reliable operation, type selecting be convenient, economic, easy to maintenance.
Because ATSE overload, short circuit need current sample, therefore use protective type CT.In fact, be exactly in PC-3 type basic framework, design adds protective type CT 4, adds the structure of current sample in controller 2, to carry out current sample, realizes overload, short-circuit protection function, and overload, short-circuit protection is adjustable, also can close.Its protective type CT 4 adopts built-in structure and two kinds of modes of outlet structure to be fixed.
Three, the form that arranges of protective type CT:
Adopt external and built-in two kinds of structures, be about to protective type CT 4 and go here and there in load wiring and be arranged on the two kinds of structures in body the inside, also will on conventional ATSE intelligent controller, increase overload, short-circuit protection function in addition.
Described built-in structure: be exactly by design the built-in space that can put into protective type CT before the gusset piece of load wiring on change over switch body, to meet current sample.
Above-described protective type CT 4 is built-in current transformer 16; its mounting means is: before the gusset piece 17 of the load wiring on change over switch body, establish a cavity; the size of this cavity can be put into described built-in current transformer 16, and described built-in current transformer 16 is fixedly mounted in this cavity.
Be as shown in Figure 5 the A-A of Fig. 4 to profile, embody arc quenching system structure and protective type CT built-in structure.
The design of protective type CT embedding structure, in load outlet, mainly contains contact plate 15, soft connection 14, gusset piece 17, protective type CT 16, wire lead slot 9, current transformer lead-in wire 7 formations.The output of protective type CT 16 is gone between and 7 is connected with controller (2) by protective type CT; One side is very large because protective type CT coil takes up space, Gu will be designed to soft connection 14 modes between contact plate 15 and gusset piece 17.Being flexible coupling 14 also can be designed to cylinder mode, between riveted joint contact plate 15 and gusset piece 17, first puts protective type CT 16 before riveted joint; Gusset piece 17 is load outlets on the other hand, no matter which power supply ATSE is operated in, load outlet is all public, and ATSE only needs 3 protective type CTs just can complete current sample like this.
Described outlet structure: be exactly by protective type CT string at change over switch body load outgoing line side, by user, be enclosed within on cable 34, to meet current sample.
Described protective type CT 4 is external current mutual inductor 33, and its mounting means is: described external current mutual inductor 33 is serially connected on the cable of this external load outgoing line side of change over switch.
What Fig. 6 represented is ATSE protective type CT outlet structure, by external protective type CT 33, is enclosed within on cable 34 and is realized.
Built-in structure is that special space is set on the pedestal of ATSE load end, with built-in protective type CT, and protection type instrument transformer is carried out to size design, can be contained in the load end of pedestal; Outlet structure is to be directly enclosed within load outgoing line side, by the protective type CT access controller that goes between.
Four, the design of arc quenching system:
Because the ATSE in the present invention possesses specified short circuit breaking capacity; therefore arc quenching system is needed to redesign; make ATSE that overload, short-circuit protection can be provided, possess short circuit breaking capacity and the short circuit making capacity of CB level, possess the specified short time withstand current requirement of PC level.Contact system is redesigned, make product possess certain short circuit breaking and making capacity, and possess short time withstand current, in short circuit breaking, ATSE can jump to two minute positions, and now load all disconnects with normal, stand-by power supply.
Described arc quenching system redesigns and comprises that contact system, slider material are selected, arc control device design.
1, the galvanic circle that the fixed contact 21 in described contact system 6, fixed contact 32 are U-shaped.When contact system designs, fixed contact is made to U-shaped galvanic circle, strengthen magnetic field and act on the electrodynamic repulsion force on moving contact.
When the loop of the fixed contact 21 (or fixed contact 32) of short circuit current by U-shaped and moving contact 18 (or moving contact 13), by parallel conductor, produce between electrodynamic repulsion force and moving contact 25 (or moving contact 30) and fixed contact 27 (or fixed contact 12) and locate Huo Muli, moving contact 18 (or moving contact 13) is opened fast, produced arc voltage and current limliting.The fixed contact 21 of U-shaped (or fixed contact 32) is when design, and the contact-making surface that connects inlet wire is higher than fixed contact 27 (or fixed contact 12) face, and fixed contact generates an electromagnetic field and can accelerate extinguish arcs like this.
2, slider material is selected:
Specified frame size electric current 400A and following dynamic and static slider material adopt respectively AgW40 and AgC5 pairing, the moving contact 25 in described contact system 6, the material of moving contact 30 are AgW40, and the fixed contact 12 in described contact system 6, the material of fixed contact 27 are AgC5.
Specified frame size electric current 400A and above dynamic and static slider material adopt respectively AgW70 and AgC5 pairing, the moving contact 25 in described contact system 6, the material of moving contact 30 are AgW70, and the fixed contact 12 in described contact system 6, the material of fixed contact 27 are AgC5.
For guaranteeing good connection interrupting performance, moving contact 25 (moving contact 30) is at rated operational current 400A and following employing AgW40, and 400A adopts AgW70 above; Fixed contact 27 (fixed contact 12) all adopts AgC5.
Silver tungsten (AgW40, AgW70) electrical contact material extreme hardness, good resistance to wear and stability, resistance to arcing is good, scaling loss is few, welding tendency is little, and silver-colored graphite 5 (AgC5) electrical contact material has good resistance fusion welding and conductivity, low and stable contact resistance and excellent low-temperature-rise characteristic, matrix silver provides good conductivity and don't has formed stable oxide, thereby can not cause the in use sharply rising of contact resistance.
The contact system of PC level double power supply automatic transfer switch is redesigned, make ATSE not only possess short time withstand current and specified short circuit making capacity, and possess specified short circuit breaking capacity, improve the short-circuit protection performance of ATSE.
3, the isolation of arc control device:
As shown in Figure 5 and Figure 6, between the contact of the two-way power supply of described contact system 6, by pedestal 28, separate.
When arc control device design, adopt conventional power supply and the complete isolation method of stand-by power supply arc extinguishing, when preventing a road power work, during because of load short circuits disjunction, the electric arc influence of generation, to another road power supply, prevents arc restriking phenomenon.Conventional power supply and stand-by power supply arc quenching system form symmetry, and centre has pedestal 28 to complete to separate, when conventional power supply, stand-by power supply splitting or integrating, be independent of each other each other.
4, the structure of described arc quenching system is:
As Fig. 7 represents the structure of arc control device, in arc control device 11, arc control device 24, establish respectively arc quenching plate 36, lower arc quenching plate 38, between described upper arc quenching plate 36 and lower arc quenching plate 38, establish multi-disc arc extinguishing grid pieces 37; Described upper arc quenching plate 36, lower arc quenching plate 38 and arc extinguishing grid pieces 37 are all used cold-rolled steel sheet Q235, plating nickel on surface.
When short circuit breaking, electric arc is pulled open in electric arc quick disjunction under the switching winding effect of switching mechanism 3, utilize upper arc quenching plate 36, arc extinguishing grid pieces 37, lower arc quenching plate 38 in arc control device that elongating arc is cut into rapidly to several sections of short arcs simultaneously, and cool in arc control device 11 and arc control device 24.Arc extinguishing grid pieces 37 is cut into short arc by long arc, not only plays the effect of grid sheet arc extinguishing, can also make electric arc cooling rapidly.
The grid sheet fixed head 35 on described arc control device 11, arc control device 24 both sides adopts gas exhausted material.The gas exhausted material that the grid sheet fixed head 35 of arc control device adopts is advanced melamine glass fabric laminate.Arc control device 11, arc control device 24 both sides flash barriers 35 adopt gas exhausted material, help gas arc blowing function.
Fig. 8 represents the part drawing of flash barrier 10, flash barrier 23; Fig. 9 represents flash barrier 8, flash barrier 22) part drawing.
The compound flash barrier of two laminated construction is established respectively in described arc control device 11, the outside of arc control device 24, wherein one deck flash barrier 10 in arc control device, flash barrier 23 are provided with a plurality of steam vents, and one deck flash barrier 8 outside arc control device, flash barrier 22 are elastic piece structure wide at the top and narrow at the bottom.
The flash barrier that has arc control device 11, arc control device 24 is grid sheet fixed head 35 aerogenesis, and at electric current, disconnects under the huge air pressure of moment, by flash barrier 10 and flash barrier 8, flash barrier 22 and flash barrier 23 exhausts, plays the effect of air-blowing arc, and electric arc is extinguished rapidly.
In the flash barrier 10 of arc quenching system inner face, the advanced melamine glass fabric laminate that flash barrier 23 adopts with steam vent; Flash barrier 8, the flash barrier 22 of arc quenching system outside are hard-steel cardboard.
Upper arc quenching plate 36, lower arc quenching plate 38 not only can play breaking arc, can also stop electric arc diffusion up and down outside arc control device.
At described fixed contact 12, the front 1.5mm～2mm of fixed contact 27 place, arc striking piece 19, arc striking piece 31 are set respectively, described arc striking piece 19, arc striking piece 31 are the structure of bending, and the direction of this bending is that electric arc is introduced to described arc control device (11,24).
Run-on tab adopts cold-rolled steel sheet Q235, plating nickel on surface.Before fixed contact, 1.5 to 2mm place design arc striking piece 19 and arc striking piece 31, plays the effect of electric arc being introduced to arc control device 24 and arc control device 11.
Arc quenching system adopts above structure can greatly improve specified short circuit breaking capacity and specified short circuit making capacity, also meets overload, short-circuit protection requirement.
Five, owing to adopting said structure and design, the present invention is had the following advantages;
1, can realize overload, short-circuit protection function to load, and adjustable, can close;
2, possess specified short circuit making capacity and specified short circuit breaking capacity;
3, overload and short-circuit protection can be turned off, just be equal to PC level double power supply automatic transfer switch, for use in fire-fighting loop.
4, possesses specified short time withstand current.
5, make that all kinds of rank ATSE are unitized, generalization, a large amount of conservation of power and social resources.
Six, the guard method of overload, short circuit:
The present invention also provides overload, the short-circuit protection method of above-described double power supply automatic transfer switch, and its goal of the invention is identical with technique scheme.
On the controller that possesses conventional ATSE function, add current sample, first carry out A/D digital translation, transship again, short-circuit protection logic judgement, if there is overload current, just by the guardtime action of requirement within the scope of inverse-time curve, when if short circuit current surpasses the multiple (short circuit set point is 1.0Ie-20.0Ie, adjustable) of rated operational current regulation, protection action makes ATSE jump to two minute positions; If do not surpass the multiple of rated operational current regulation, continue monitoring current numerical value.
The step of described guard method is:
1, current sample;
2, A/D digital translation;
3, on controller 2, show current value, then carry out respectively step 4 and step 5;
4, controller 2 judges that whether current value is greater than overload protection set point, if so, enters step 6; If not, return to step 1;
5, controller 2 judges that whether current value is greater than short-circuit protection set point, if so, enters step 6; If not, return to step 1;
6, switching winding action, double power supply automatic transfer switch is in two minutes states;
7, meeting under the condition of double power supply automatic transfer switch normal operation, by manually or by combined floodgate button, double power supply automatic transfer switch is being devoted oneself to work again, returning to step 1.
Figure 10 is the overload of ATSE, the FB(flow block) of short-circuit protection, step 1 is carried out current sample by protective type CT 4, step 2 is carried out A/D conversion by the electric current microprocessor in controller 2, step 3 shows current value on controller 2, step 4 and step 5 judge respectively whether demonstration current value is greater than overload and short-circuit protection set point, if not, return to the sampling of step 1 intermittent current; If so, enter the action of step 6 switching winding, after action, ATSE jumps to two minute positions.
Until after unloading or short trouble eliminating, again manually or by combined floodgate button (conventional power supply or stand-by power supply combined floodgate button) ATSE is devoted oneself to work.
Described overload, short-circuit protection set point are all adjustable and can close.Described closing refers to, when not needing overload protection, can close and plant protection; When not needing overload and short-circuit protection, overload and short-circuit protection all can be closed.
When overload protection is closed, in Figure 10 without step 4, when overload, short-circuit protection are when all close, in figure only in steps 1, step 2 and step 3.
By reference to the accompanying drawings the present invention is exemplarily described above; obviously specific implementation of the present invention is not subject to the restrictions described above; as long as adopted the improvement of the various unsubstantialities that method of the present invention design and technical scheme carry out; or without improving, design of the present invention and technical scheme are directly applied to other occasion, all within protection scope of the present invention.
Claims (2)
1. a double power supply automatic transfer switch, is located on the change-over circuit of two-way power supply, comprises controller (2), switching mechanism (3), contact system (6) and arc quenching system;
It is characterized in that:
The load circuit of described double power supply automatic transfer switch is provided with protective type CT (4), and described protective type CT (4) is connected with described controller (2) circuit;
Described protective type CT (4) is built-in current transformer (16), or is external current mutual inductor (33); The mounting means of described built-in current transformer (16) is: the gusset piece of the load wiring on change over switch body (17) is front establishes a cavity, and described built-in current transformer (16) is fixedly mounted in this cavity; The mounting means of described external current mutual inductor (33) is: described external current mutual inductor (33) is serially connected on the cable (34) of this external load outgoing line side of change over switch;
Fixed contact in described contact system (6) (21,32) is the galvanic circle of U-shaped;
The material of the moving contact in described contact system (6) (25,30) is AgW40, or is AgW70; The material of the fixed contact in described contact system (6) (12,27) is AgC5;
Between the contact of the two-way power supply of described contact system (6), by pedestal (28), separate;
The structure of described arc quenching system is:
In arc control device (11,24), establish upper arc quenching plate (36), lower arc quenching plate (38), between described upper arc quenching plate (36) and lower arc quenching plate (38), establish multi-disc arc extinguishing grid pieces (37); The grid sheet fixed head (35) on described arc control device (11,24) both sides adopts gas exhausted material; The compound flash barrier of two laminated construction is established in described arc control device (11,24) outside, and wherein one deck flash barrier in arc control device (10,23) is provided with a plurality of steam vents, and one deck flash barrier outside arc control device (8,22) is elastic piece structure wide at the top and narrow at the bottom;
At the front 1.5mm～2mm of described fixed contact (12,27) place, arc striking piece (19,31) is set, described arc striking piece (19,31) is the structure of bending, and the direction of this bending is that electric arc is introduced to described arc control device (11,24).
2. according to the overload of double power supply automatic transfer switch claimed in claim 1, short-circuit protection method, it is characterized in that: the step of described guard method is:
1), current sample;
2), A/D digital translation;
3), at the upper current value that shows of controller (2), then carry out respectively step 4) and step 5);
4), controller (2) judges that whether current value is greater than overload protection set point, if so, enters step 6); If not, return to step 1);
5), controller (2) judges that whether current value is greater than short-circuit protection set point, if so, enters step 6); If not, return to step 1);
6), switching winding action, double power supply automatic transfer switch is in two minutes states;
7), meeting under the condition of double power supply automatic transfer switch normal operation, by manually or by combined floodgate button, double power supply automatic transfer switch is devoted oneself to work again, return to step 1).
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| CN201110204861.8A CN102354638B (en) | 2011-07-21 | 2011-07-21 | Dual-power automatic transfer switch and overload and short-circuit protection method thereof |
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| CN201110204861.8A CN102354638B (en) | 2011-07-21 | 2011-07-21 | Dual-power automatic transfer switch and overload and short-circuit protection method thereof |
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| CN102354638B true CN102354638B (en) | 2014-03-12 |
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| CN201110204861.8A Expired - Fee Related CN102354638B (en) | 2011-07-21 | 2011-07-21 | Dual-power automatic transfer switch and overload and short-circuit protection method thereof |
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Cited By (1)
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| CN106486305A (en) * | 2015-08-25 | 2017-03-08 | 上海精益电器厂有限公司 | Three-way power CB level automatic transfer switching equipment |
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| WO2014131163A1 (en) * | 2013-02-27 | 2014-09-04 | General Electric Company | Electrical transfer switch system |
| CN103258664B (en) * | 2013-04-19 | 2015-05-13 | 上海亿盟电气自动化技术有限公司 | Automatic change-over switch |
| CN103576537B (en) * | 2013-08-01 | 2015-01-28 | 安徽鑫龙电器股份有限公司 | Detector for double-power supply conversion time |
| CN105931871A (en) * | 2016-05-25 | 2016-09-07 | 林益晶 | Dual-power electric change-over switch |
| CN105931867A (en) * | 2016-05-25 | 2016-09-07 | 林益晶 | Design method for dual-power electric change-over switch |
| CN108270284A (en) * | 2017-12-28 | 2018-07-10 | 施耐德万高（天津）电气设备有限公司 | A kind of control method for supporting multiple power sources automatic change-over mechanism |
| CN108306411B (en) * | 2018-03-27 | 2024-05-07 | 北京京人电器有限公司 | Power supply switching device |
| CN110970239B (en) * | 2018-09-30 | 2022-05-27 | 施耐德电器工业公司 | Automatic transfer switch, dual-power automatic transfer switch and manufacturing method thereof |
| CN110517913A (en) * | 2019-09-27 | 2019-11-29 | 兴宇科技沧州有限公司 | A kind of dual power supply arc-control device |
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Address after: 241008 Anhui Province, Wuhu City Jiuhua Jiujiang District Road No. 118 Patentee after: ANHUI ZHONGDIAN XINGFA AND XINLONG TECHNOLOGY CO., LTD. Address before: 241008 Anhui Province, Wuhu City Jiuhua Jiujiang District Road No. 118 Patentee before: Xinlong Electric-Appliance Co., Ltd., Anhui |
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Effective date of registration: 20170510 Address after: 241008 Anhui Province, Wuhu City Jiuhua Jiujiang District No. 118 North Park electrical components Patentee after: Anhui Xin Long SBLV Address before: 241008 Anhui Province, Wuhu City Jiuhua Jiujiang District Road No. 118 Patentee before: ANHUI ZHONGDIAN XINGFA AND XINLONG TECHNOLOGY CO., LTD. |
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