CN104716737B - A kind of circuit for contactor type dual-power transfer switch electrical equipment - Google Patents

Abstract

The invention discloses a kind of circuit for contactor type dual-power transfer switch electrical equipment, be characterized in being provided with capacity voltage dropping circuit in crucial energy-saving circuit module and putting into selection switch.Capacity voltage dropping circuit be provided with starting relay as short switch for catalyst full voltage starting time, the relatively low catalyst adhesive hold mode of power is then powered by capacity voltage dropping circuit, thus realize high voltage startup low pressure and keep energy saver mode, the main advantages of the present invention as follows: energy-saving circuit module connects and puts into the coupling use selecting switch, an energy-saving circuit module can be shared by two A.C. contactors, save an energy-saving circuit module, simplified circuit structure, add the reliability of circuit；Provide cost savings power factor close to 1, power consumption little；Good economy performance, cost performance are high, do not have A.C. contactor distinctive noise during operation, and easy to manufacture, maintenance is also convenient for, and maintenance cost is low, energy-conserving and environment-protective.PC level ATSE can be replaced to use, there is bigger promotional value.

Description

A kind of circuit for contactor type dual-power transfer switch electrical equipment

Technical field

The present invention relates to a kind of low-voltage electrical apparatus, open particularly to the conversion of a kind of dual power supply with A.C. contactor as master switch Close electrical equipment.

Background technology

The important events of some low-voltage distributions, the economic loss caused because of power failure for minimizing, use two road power supplys to power: Conventional, standby or the most standby, this two roads power supply can be all that electrical network is powered, it is possible to a road is that electrical network is powered, and a road is diesel oil Generator powered.When a road power supply in power supply process because of fault can not normal power supply time, its load is switched to another road The device of power supply is referred to as dual-power transfer switch electrical equipment, is called for short TSE, and the device that its load is automatically handed over another road power supply claims For automatic transfer switching electric appliance, it is called for short ATSE.

At present, ATSE is typically made up of automatic change-over body and control circuit two parts, is used primarily in and does not allows to stop The important place of electricity.When ATSE detects the deviation that the current power supply voltage of load or frequency occur more than permission, ATSE automatically switches to another power supply and powers, it is ensured that load supplying does not interrupts.

TSE is generally classified as PC level, CB level and three ranks of CC level, is defined as follows by short-circuit capacity:

CB level is equipped with the TSE of overcurrent release, and its main contact can connect and be used for disjunction short circuit current.

CC level can be connected and carry, but is not used in the TSE of disjunction short circuit current, and this TSE is mainly by satisfied contact The electrical equipment that the national standard of device requires is constituted.

PC level can be connected and carry, but is not used in the TSE (note: if PC level can be met of disjunction short circuit current Test requirements document, catalyst can be used for PC level).

Understanding CC level from definition the most the same with PC level, be considered as a special case of PC level, simply it is by connecing Tentaculum is constituted.

The difference of CB level ATSE and PC level ATSE is not only in that disjunction short circuit current ability, constitutes at machinery, contact material Select, safety there is also difference.CB level ATSE is made up of two choppers, there is slide fastener, buckles problem again；Contact of breaker pressure Power is little, it is impossible to carrying short circuit tolerance electric current；The multiplex oxidizable silver-colored tungsten of contact material, silver tungsten carbide etc., cause temperature rise after oxidation Increase, switch may finally be caused to burn；Also there is power supply superposition problem during conversion, residual current circuit breaker may be caused to jump Lock；When connecing fire-fighting load, do not meet regulation ATSE in national standard " control circuit of fixed fire pump driver " and should not carry Short circuit and the requirement of excess current protective function.After electrical apparatus release dropout disjunction short circuit current, it may appear that mains side has electricity, load-side is broken The situation of electricity, does not meets the power reguirements of I and II load.PC level ATSE overcomes the problem that CB level ATSE exists, as it touches Head pressure is difficult to greatly be scolded out, and contact is difficult to, by melting welding, to bear the dash current of more than 20Ie, it is ensured that fire-fighting electric power system Reliable power supply Deng important load.Contact material good in oxidation resistance, high resistance are burnt, and such as silicon alloy, also using can from wiping point With cleaning dust and oxide-film, both improve service life, added again security performance；Electric clearance, creep age distance allowance Greatly, thus its reliability is higher.

ATSE experienced by for four stages at home at present.First stage is contactor type, belongs to CC level, by two catalysts and Its mechanically and electrically interlock composition, reliability is low, power consumption is big, electrical engineering application in gradually replaced.Second stage For breaker type, belong to CB level, be made up of two choppers, motor drive mechanism and mechanical interlock mechanism, there is short circuit or over current protection Protective function, volume is big, conversion speed is slow, mechanical interlocking reliability is not ideal enough, and the use not meeting the places such as fire-fighting load is wanted Asking, its application has certain limitation.Phase III is on-load switch formula, belongs to PC level, by two on-load switches and Overlapping built-in interlocking mechanism to combine, compact conformation, volume are little, self interlocking, change and are come by solenoid generation captivation Driving switch, conversion speed is fast.Fourth stage is double-throw formula (bikini), falls within PC level, and main body is single-pole double throw integration Disconnecting switch, by built-in mechanical connection hold mode, conversion is driven by motor, and conversion is steadily and speed is fast, simple in construction, Volume is little, self interlocking, safe and reliable, and there is zero passage bit function.

The ATSE that reliability is high at present not only requires that control circuit is intelligent, has various signal, fire-fighting link and connects with communicating Mouthful, accuracy of detection is high, and the parameter set point width such as voltage, frequency, delay time, Electro Magnetic Compatibility is good.Also require switch main body Shock resistance current capacity high, can frequent transitions, mechanical interlocking is reliable, the conversion time is fast, zero-bit function, and isolation distance is big, holds The voltage that is hit is high；The N pole of four-pole switch can first be closed and be divided afterwards, in case there is potential drifting on N line during switching, causes residual current Protection device misoperation.CB level can not fully meet requirement, but PC level ATSE exists the problems such as price is higher, maintenance cost is high, Typically only just can use in very important place.

The improvement situation of existing CC level ATSE: CC level ATSE majority uses auxiliary reclay or time relay conduct in early days Control element and build a control circuit, control the catalyst on two major loops, it is achieved the conversion of two-way power supply.Ac contactor Device is the industrial control electric appliance that a kind of technology is highly developed, is mainly used in controlling motor start-up and stopping, can frequent movement, enough bear The peak impulse current of more than 20Ie.And the peak impulse current of motor start-up moment to be generally 6e～7Ie, ATSE main Loadtype majority is the mixed load such as illuminating lamp, UPS, contact connect moment, dash current is less, though be fire pump, The inductive loads such as smoke exhaust fan, owing to ATSE is switched fast, dash current is super not over 20Ie, occurs that contact melts hardly The situation of weldering.

The mechanical interlocking of ATSE and the undesirable defect of electric interlock reliability, enter the voltage signal of each road power supply in early days Row detection in real time, when there are the abnormal conditions such as decompression, under-voltage, overvoltage, carries out conversion operation automatically.Although Interlock Reliability improves , but unresolved safety issue.

A.C. contactor as key element is operation principle based on " power-off discharges for energising adhesive, charged holding " On, the most when the coil is energized, static iron core produces electromagnetic attraction, by dynamic iron core adhesive, owing to contact system is and dynamic iron core Linkage, therefore move iron core and drive three movable contact springs to run simultaneously, the closing of contact, thus switch on power.When the coil is de-energized, inhale Power disappears, and dynamic iron core linkage part relies on the counteracting force of spring to separate, and makes main contact disconnect, cuts off the electricity supply.For realizing it Work process, technological design and have employed corresponding structure, in running, the magnetic hystersis loss in iron core and short-circuited conducting sleeve and eddy current Loss accounts for more than the 90% of total energy consumption, and power factor is low, and noise is big, and coil temperature rise is high, increases the electric energy on power network line Loss, reduces the service life of contactor coil.

In sum, the economical preferable advantage of CC level ATSE, i.e. contactor type ATSE.Overcome at present the interlocking can By the problem that property is low, if the weakness that its power consumption is big can be transformed with technological means row, reach the purpose of energy-conserving and environment-protective, reduce its temperature rise To improve its reliability, then it is greatly improved its cost performance, it will make CC level ATSE being replaced again radiate vigour.

Summary of the invention

There is drawbacks described above for solving to be currently used for the circuit of contactor type dual-power transfer switch electrical equipment, the present invention provides A kind of reliability is high, power consumption is little, the quiet circuit for contactor type dual-power transfer switch electrical equipment of work.

For achieving the above object, the scheme that the present invention takes is:

A kind of circuit for contactor type dual-power transfer switch electrical equipment, including as conventional on and off switch and standby electricity Two A.C. contactors of source switch, and control the control circuit of two A.C. contactor work；Wherein, it is located at conventional power supply The A.C. contactor of switch terminals is defined as conventional catalyst, and the A.C. contactor being located at Backup Power Switch end is defined as standby connecing Tentaculum；It is characterized in that: described control circuit includes the working power module powered for circuit system, process as central data Control unit module, the power supply voltage signal detection module being connected with control unit module input respectively, man-machine interaction mould Block and catalyst duty detection module, the duty display module being connected with control unit module outfan respectively, Output alarm signal module, control follow-up energy-saving circuit module work drive circuit module, with drive circuit module outfan Connect and export DC source and drive the energy-saving circuit module of A.C. contactor work, and defeated with energy-saving circuit module respectively Go out the input selection switch that the outfan of end and drive circuit module connects；Put into and select switch to be provided with normally closed outfan and normally opened Outfan, normally closed outfan is connected with the coil input end of conventional catalyst, and normally opened outfan is defeated with the coil of standby catalyst Enter end to connect；Wherein, energy-saving circuit module is the unidirectional current automatic switch-over circuit of exportable two kinds of voltages, i.e. at A.C. contactor In attracting process, the output of this unidirectional current automatic switch-over circuit ensures the high voltage direct current of A.C. contactor adhesive, at ac contactor After device adhesive completes, the output of this unidirectional current automatic switch-over circuit ensures that A.C. contactor keeps the low-voltage DC of attracting state； Catalyst duty detection module is connected with conventional catalyst and standby catalyst respectively；Energy-saving circuit module is for connect exchange Tentaculum controls power supply and is become the circuit module of direct current from exchange, and it includes carrying out conventional power supply and stand-by power supply selected as friendship The power selection switch of stream catalyst power supply, can start A.C. contactor and make the instantaneous pressure start-up circuit of closed action, Exportable low voltage makes the low pressure holding circuit that A.C. contactor is kept closed；The input of power selection switch is with often Be connected with stand-by power supply with power supply, the outfan of power selection switch respectively with input and the low pressure of instantaneous pressure start-up circuit The input of holding circuit is connected, and the outfan of instantaneous pressure start-up circuit and the outfan of low pressure holding circuit select with putting into Switch input terminal is connected；Power selection switch is the power supply selective relay being provided with two groups of normally closed normally open contacts, its normally closed interlock Being connected with conventional power supply, its normally open contact is connected with stand-by power supply；Instantaneous pressure start-up circuit includes rectifier bridge, and controls wink Between the starting relay with double groups of normally open contacts of high-voltage starting circuit break-make；Low pressure holding circuit includes capacity voltage dropping circuit And the rectifier bridge in aforementioned instantaneous pressure start-up circuit；Wherein, capacity voltage dropping circuit is by the nonpolarity electricity being resistant to power frequency high voltage Container and the discharge resistance in parallel with this non-polar condenser composition；The first input end of rectifier bridge and power supply selective relay First common port connects, the common port of starting relay and the input of capacity voltage dropping circuit all with the of power supply selective relay Two common ports connect, and the normally opened outfan of starting relay and the outfan of capacity voltage dropping circuit all input with the second of rectifier bridge End connects；Rectification bridge output end is connected with putting into the common port selecting switch.

In foregoing circuit, starting circuit and reduction voltage circuit share a rectifier bridge, are Rectified alternating current convert alternating current, Then supply coil, make circuit the most simple and reliable.The effect essence of starting relay is that electric capacity two ends are carried out fault control, During connection, the voltage of rectifier bridge input is the voltage of whole alternating current power supply, and during disconnection, the voltage of rectifier bridge input is through nothing The voltage of alternating current power supply after polar capacitor blood pressure lowering.Electric capacity used by blood pressure lowering in capacity voltage dropping circuit is idle electronics unit Part, during work, itself does not consume active power, will not change the power supply sinusoidal wave form after blood pressure lowering, and load characteristic is by original inductive Load transfer is capacity load, not only will not pollute electrical network, also electrical network be played compensating action, produce positive effect.

Aforesaid contacts duty detection module is the auxiliary contact being located on conventional catalyst and standby catalyst, auxiliary Help that contact is provided with the normally open contact of the main contact of the main contact of conventional catalyst or standby catalyst linkage and normally closed touch Head.By normally open contact and the connection of normally closed interlock, i.e. can determine that the state of main noddle on contactor；Utilize auxiliary contact also can set Put regular alternating current contactor circuit interlock circuit, the most do not make further physical circuit explanation.

Preferably, aforementioned non-polar condenser is CBB electric capacity, and its pressure voltage is 240V ~ 1000V, its capacity be 0.1uF ~ 2.2uF.CBB electric capacity is polypropylene capactive, is using metal forming as electrode, by itself and polypropylene film after the overlap of two ends, Being wound into the capacitor of the structure of cylindrical shape, nonpolarity, insulation impedance is the highest, and frequency characteristic is excellent, and dielectric loss is the least. It is widely used on the circuit of resonance circuit, bypass circuit and high-frequency high-voltage.

Aforementioned discharge resistance is 330k Ω ~ 1000 k Ω.

Or, aforementioned non-polar condenser is safety electric capacity, and its pressure voltage is 240V ~ 600V, its capacity be 0.1uF ~ 2.2uF。

Equally, aforementioned discharge resistance is 330k Ω ~ 1000 k Ω.

As the improvement of such scheme, between aforementioned rectification bridge output end and the common port putting into selection switch, it is in series with heat Quick resistance.

The aforementioned selection switch that puts into is at least provided with one group of normally open contact and the relay of normally closed interlock, and by this relay It is defined as putting into selective relay.

Aforementioned conventional catalyst and standby catalyst include the iron core as magnetic circuit, and iron core is the pig iron or the steel plate structure of monoblock Become.Become direct current owing to energy-saving circuit module controls power supply A.C. contactor from exchange, make the A.C. contactor can electric current greatly The mode of adhesive small area analysis sticking works, and is exactly substantially that A.C. contactor is used as D.C. contactor, and Traditional DC connects The scale of construction is relatively large because its coil is taller and thinner for tentaculum, and avoids the Traditional DC catalyst using identical capacity, decreases The volume of catalyst.Relatively inexpensive material generation such as the pig iron or steel plate can be used for the iron core in this ac contactor electromagnetic system For the stalloy that price is of a relatively high, and eliminate the short-circuited conducting sleeve on iron core, thus effectively eliminate A.C. contactor Intrinsic electromagnetic consumable " iron loss " and " copper loss ", also eliminate exchange noise intrinsic during operation；Contact without short-circuited conducting sleeve Device processing technique decreases, and the various faults brought because of the damage of short-circuited conducting sleeve also eliminate, but also save material；By Contactor coil running voltage and electric current when sticking are greatly reduced, and the line footpath of coil reduces the most accordingly, saves copper material.Warp After this transformation, A.C. contactor not only significantly reduces the power consumption of electromagnetic system, decreases the consumption of material, simplifies technique, fall Low cost, and low-down temperature rise also extends coil service life, makes reliability and safety have qualitative leap.Right In the above A.C. contactor of rated current 400A, electric energy is up to more than 96%.

The line footpath of the coil of aforementioned conventional catalyst and standby catalyst is the line footpath of same specification A.C. contactor line coil 90%.Due to direct current sucting speed than exchange sucting speed faster, electromagnetic attraction higher, therefore keep original working index feelings Under condition, operating current can be more relatively small, reduces providing the foundation for the line footpath of coil, the constant situation of the number of turn at coil Under, be conducive to reducing the volume of coil, save the consumption of copper material, save resource, reduce cost.

Further illustrating as such scheme, power selection switch guarantees that control circuit has two-way power supply to be simultaneously in confession Electricity condition.Two groups of normally closed normally open contacts, it is ensured that have a road power supply normal power supply, and occur without two-way power supply and power simultaneously, cause Interfere with each other.The working power of control circuit is at least made up of two-way power supply, it is ensured that occurring at arbitrary road power supply of control circuit Can normally work during fault；By power supply voltage signal detection module, the voltage signal of two-way power supply is detected, to judge Power supply status is the most normal；The A.C. contactor duty of two-way power supply is carried out by catalyst duty detection module simultaneously Detection, it is ensured that two catalysts normally work；Relevant information, according to testing result, is processed, shows by control unit module, And export control signal or alarm signal.Certainly, if Intelligent control circuit, it is also possible to plus man-machine communication's platform.Work as place When reason result requires transformation into another road power supply, control unit module sends corresponding control instruction to drive circuit module and selection Switch, drive circuit module disconnects the control power supply of the A.C. contactor of mains side of originally devoting oneself to work, and energy-saving circuit module is lost Electricity, is output as zero, makes the catalyst of former adhesive disconnect；Subsequently quickly (time delay can certainly be carried out according to practical situations) Connect the control power supply of catalyst switching another power supply, energy-saving circuit module obtain electric after, the full-voltage starting after the rectification of output Voltage, through selecting switch to target contactor coil, makes A.C. contactor adhesive；After having started, power save circuit automatically switches To relatively low pulsating dc voltage, catalyst is made to keep attracting state.

The use of energy-saving circuit module, make after two A.C. contactor adhesives the power factor of electromagnetic system close to 1, power consumption Becoming the lowest, the range of decrease is up to more than 95%, and power savings is obvious, thus realizes the long-term continuous firing of catalyst and keep low temperature Rising, perfection solves that the power consumption of in early days CC level ATSE Electromagnetic System of Contactor is big, the high problem easily burnt of coil temperature rise, increases The strong service life of two A.C. contactors.Owing to the contact of two A.C. contactors is not simultaneously in closure state, joint Energy circuit module connects and puts into the coupling use selecting switch, can share an energy-saving circuit module by two A.C. contactors, Save an energy-saving circuit module, simplified circuit structure, added the reliability of circuit, provide cost savings.

For not having the ATSE of delay requirement, switching action typically can complete in 0.2s, the most imperceptible power failure Sensation, suitably selects the preferable A.C. contactor of indices parameter and mixes relatively reliable mechanical interlocks, the most permissible Reaching PC level ATSE indices, can substitute for PC level ATSE and use, its cost performance is high, safeguards more convenient.

Be worth special instruction: due to catalyst not closed time, its iron core is separate, i.e. moves iron core and electrostatic core not Close and form complete magnetic circuit, therefore when starting, static iron core needs bigger magnetic force could attract come by dynamic iron core, after closing, Both define complete magnetic circuit, avoid the need for big magnetic force and maintain and be closed, and magnetic force is flow through coil by electric current and produces, the most just It is to say, has only to less electric current after Guan Bi and can maintain the closure state of catalyst.Therefore, conventional catalyst or standby contact Device, by after electricity, after total head alternating current is rectified, becomes high-pressure pulsating unidirectional current and starts, after A.C. contactor Guan Bi, cancel starting Signal, is switched on capacity voltage dropping circuit simultaneously, rectified after become low pressure Rectified alternating current when providing long for contactor coil Between the constant current source that works, capacity voltage dropping circuit key element non-polar condenser is wattless component, and itself does not consume wattful power Rate, does not generates heat, and also load characteristic is converted simultaneously, the inductive load of contactor coil will transfer capacitive load to, Avoid the generation of harmonic wave, reduce the harmonic pollution to electrical network.The loss so exchange brought all eliminates, coil Temperature rise falls too low the most therewith, and noise also eliminates.

Its principle of capacity voltage dropping circuit actually utilizes capacitive reactance current limliting, flows through contactor coil by electric current and produces magnetic force Carrying out the attracting state of control contactor, its Current calculation formula is illustrated below.Such as, the exchange of 220V/50Hz is being received Voltage is as controlling voltage, when capacitance C is 1uF, if the employing available electric current of all wave rectification (meansigma methods) is: I (AV)=0.89×V/Zc=0.89×220×2×∏×f×C =0.89×220×2×3.14×50×C=60000C = 60000×0.000001=0.06A=60mA。

Work process is as follows: after powering on, and when two-way power supply is all in normal condition, conventional catalyst Guan Bi, by conventional electricity Source powers to the load, and when conventional power supply generation decompression, phase shortage or under-voltage fault, control unit module is to drive circuit module Sending input selects switch to send and forward standby catalyst switching signal and catalyst pickup signal to, after catalyst adhesive, and contact Device pickup signal releases；Control unit module then sends catalyst to drive circuit module and keeps pickup signal, it is achieved by standby Power to the load with power supply.When conventional power up is normal, control unit module sends input to drive circuit module and selects Switch sends and forwards conventional catalyst switching signal and catalyst pickup signal, after catalyst adhesive, catalyst pickup signal solution to Remove；Control unit module then sends catalyst to drive circuit module and keeps pickup signal, it is achieved by conventional power supply to load Power supply.

From the foregoing, it will be observed that the present invention mainly has the advantage that the simple science of circuit, reliability is high, power factor close to 1, merit Consume little；Not only good economy performance, cost performance are high, there is not the defect of CB level ATSE, do not have that A.C. contactor is distinctive makes an uproar during operation Sound, easy to manufacture, maintenance is also convenient for, and maintenance cost is low, energy-conserving and environment-protective.PC level ATSE can be replaced to use, meet current low-carbon (LC) warp The social theme of Ji, also complies with the policy of current national energy-saving and emission-reduction, has bigger promotional value.

Accompanying drawing explanation

Fig. 1 is the schematic block circuit diagram of the present invention.

Fig. 2 is the energy-saving circuit schematic diagram of Fig. 1.

Main Reference label declaration:

1, instantaneous pressure start-up circuit 2, low pressure holding circuit 3, power selection switch.

Detailed description of the invention

Below in conjunction with the accompanying drawings and preferred embodiment, the present invention and Advantageous Effects thereof are carried out the most specifically Bright.

Embodiment 1: see Fig. 1 ~ Fig. 2, the circuit for contactor type dual-power transfer switch electrical equipment includes as conventional On and off switch and two A.C. contactors of Backup Power Switch, and control the control circuit of two A.C. contactor work； Wherein, the A.C. contactor being located at conventional on and off switch end is defined as conventional catalyst KM2, is located at the friendship of Backup Power Switch end Stream catalyst is defined as standby catalyst KM1；Described control circuit includes the working power module powered for circuit system, as The control unit module that central data processes, the power supply voltage signal being connected with control unit module input respectively detection mould Block, human-computer interaction module and catalyst duty detection module, the work being connected with control unit module outfan respectively State display module, output alarm signal module, control follow-up energy-saving circuit module work drive circuit module, with drive electricity Road module outfan connects and exports the energy-saving circuit module that DC source drives A.C. contactor to work, and respectively with energy-conservation The input that the outfan of circuit module and the outfan of drive circuit module connect selects switch K2；Put into and select switch K2 to be provided with Normally closed outfan and normally opened outfan, normally closed outfan is connected with the coil input end of conventional catalyst KM2, normally opened outfan with The coil input end of standby catalyst KM1 connects；Wherein, energy-saving circuit module is that the unidirectional current of exportable two kinds of voltages is cut automatically Changing circuit, i.e. in A.C. contactor attracting process, the output of this unidirectional current automatic switch-over circuit ensures A.C. contactor adhesive High voltage direct current, after A.C. contactor adhesive completes, the output of this unidirectional current automatic switch-over circuit ensures that A.C. contactor keeps The low-voltage DC of attracting state；Catalyst duty detection module respectively with conventional catalyst KM2 and standby catalyst KM1 Connect；Energy-saving circuit module is A.C. contactor to be controlled power supply become the circuit module of direct current from exchange, and it includes conventional Power supply and stand-by power supply carry out the power selection switch 3 selected as A.C. contactor power supply, can start A.C. contactor Making the instantaneous pressure start-up circuit 1 of closed action, the low pressure that exportable low voltage makes A.C. contactor be kept closed is protected Hold circuit 2；The input of power selection switch 3 is connected with conventional power supply and stand-by power supply, and the outfan of power selection switch 3 divides It is not connected with the input of instantaneous pressure start-up circuit 1 and the input of low pressure holding circuit 2, instantaneous pressure start-up circuit 1 Outfan selects switch K2 input to be connected with the outfan of low pressure holding circuit 2 with putting into；Power selection switch 3 is for being provided with two Organizing the power supply selective relay K3 of normally closed normally open contact, its normally closed interlock is connected with conventional power supply, its normally open contact and standby electricity Source connects；Instantaneous pressure start-up circuit 1 includes rectifier bridge, and controls the normal with double groups of instantaneous pressure start-up circuit 1 break-make The starting relay K1 of open contact；Low pressure holding circuit 2 includes in capacity voltage dropping circuit and aforementioned instantaneous pressure start-up circuit 1 Rectifier bridge；Wherein, capacity voltage dropping circuit by be resistant to power frequency high voltage non-polar condenser C1 and with this non-polar condenser C1 Discharge resistance R1 composition in parallel；The first input end of rectifier bridge is connected with first common port of power supply selective relay K3, opens The common port of motor type relay K1 and the input of capacity voltage dropping circuit all the second common ports with power supply selective relay K3 are connected, The normally opened outfan of starting relay K1 and the outfan of capacity voltage dropping circuit are all connected with the second input of rectifier bridge；Rectification Bridge outfan is connected by critesistor Rt1 with putting into the common port selecting switch K2.

Aforesaid contacts duty detection module is the auxiliary being located on conventional catalyst KM2 and standby catalyst KM1 Contact, the normally open contact linked with the main contact of the main contact of conventional catalyst or standby catalyst that auxiliary contact is provided with and Normally closed interlock.By normally open contact and the connection of normally closed interlock, i.e. can determine that the state of main noddle on contactor；Utilize auxiliary contact Regular alternating current contactor circuit interlock circuit also can be set, the most do not make further physical circuit explanation.

Preferably, seeing Fig. 2, aforementioned non-polar condenser C1 is CBB electric capacity, and its pressure voltage is 240V ~ 1000V, and it holds Amount is 0.1uF ~ 2.2uF.Or, aforementioned non-polar condenser C1 is safety electric capacity, and its pressure voltage is 240V ~ 600V, its capacity For 0.1uF ~ 2.2uF.The discharge resistance R1 that matches is 330k Ω ~ 1000 k Ω.Safety electric capacity is big due to allowance, during selection, The tolerances of pressure voltage can be considered, it is to avoid choose the area that too high pressure voltage busy line plate is excessive.Generally Coming, master switch contact capacity is the biggest, and the capacity of the capacitor of selection is the biggest.

More specifically, for master switch contact as 9A ~ ATSE of 12A, can be selected for the CJT1 that rated current is 9A ~ 12A Series AC Contactor；If during running voltage 220V: non-polar condenser C1 can be selected for pressure voltage be 400V, capacity be The CBB electric capacity of 0.33uF；Or can be selected for pressure voltage be 240V, capacity be the safety electric capacity of 0.33uF, match electric discharge electricity Resistance R1 is 1000k Ω.If during running voltage 380V: non-polar condenser C1 can be selected for pressure voltage be 630V, capacity be The CBB electric capacity of 0.15uF；Or can be selected for pressure voltage be 400V, capacity be the safety electric capacity of 0.15uF, match electric discharge electricity Resistance R1 is 750k Ω.

The aforementioned selection switch K2 that puts into is at least provided with one group of normally open contact and the relay of normally closed interlock, and by this relay Device is defined as putting into selective relay.

Aforementioned conventional catalyst KM2 and standby catalyst KM1 includes the iron core as magnetic circuit, iron core be monoblock the pig iron or Steel plate is constituted.

The line footpath of the coil of aforementioned conventional catalyst KM2 and standby catalyst KM1 is same specification A.C. contactor line coil Line footpath 90%.

Embodiment 2: see Fig. 2, the present embodiment is substantially the same manner as Example 1, and difference is master switch contact capacity: Specifically, for master switch contact as 16A ~ ATSE of 25A, can be selected for the CJT1 series exchange that rated current is 9A ~ 12A and connect Tentaculum；If during running voltage 220V: non-polar condenser C1 can be selected for pressure voltage be 400V, capacity be 0.47uF CBB electricity Hold；Or can be selected for pressure voltage be 240V, capacity be the safety electric capacity of 0.47uF, the discharge resistance R1 that matches is 750k Ω. If during running voltage 380V: non-polar condenser C1 can be selected for pressure voltage be 630V, capacity be the CBB electric capacity of 0.22uF；Or Person can be selected for pressure voltage be 400V, capacity be the safety electric capacity of 0.22uF, the discharge resistance R1 that matches is 500k Ω.

Book and specific embodiment do not constitute any restriction to the present invention according to the above description, the invention is not limited in The detailed description of the invention that face is disclosed and described, some amendments and the deformation to the present invention, it should also the right falling into the present invention is wanted In the protection domain asked.

Claims (10)

1. for a circuit for contactor type dual-power transfer switch electrical equipment, including as conventional on and off switch and stand-by power supply Two A.C. contactors of switch, and control the control circuit of two A.C. contactor work；Wherein, it is located at conventional power supply to open The A.C. contactor of Guan Duan is defined as conventional catalyst, and the A.C. contactor being located at Backup Power Switch end is defined as standby contact Device；It is characterized in that: described control circuit includes the working power module powered for circuit system, process as central data Control unit module, the power supply voltage signal detection module being connected with control unit module input respectively, human-computer interaction module, And catalyst duty detection module, the duty display module being connected with control unit module outfan respectively, defeated Go out alarm signal module, control the drive circuit module that follow-up energy-saving circuit module works, with drive circuit module outfan even Connect and export DC source and drive the energy-saving circuit module of A.C. contactor work, and respectively with the output of energy-saving circuit module The input that the outfan of end and drive circuit module connects selects switch；Put into and select switch to be provided with normally closed outfan and normally opened defeated Going out end, normally closed outfan is connected with the coil input end of conventional catalyst, and normally opened outfan inputs with the coil of standby catalyst End connects；Wherein, energy-saving circuit module is the unidirectional current automatic switch-over circuit of exportable two kinds of voltages, i.e. inhales at A.C. contactor During conjunction, the output of this unidirectional current automatic switch-over circuit ensures the high voltage direct current of A.C. contactor adhesive, at A.C. contactor After adhesive completes, the output of this unidirectional current automatic switch-over circuit ensures that A.C. contactor keeps the low-voltage DC of attracting state；Connect Tentaculum duty detection module is connected with conventional catalyst and standby catalyst respectively；Energy-saving circuit module is ac contactor Device controls power supply and is become the circuit module of direct current from exchange, and it includes carrying out conventional power supply selected as exchanging with stand-by power supply The power selection switch of catalyst power supply, can start A.C. contactor and make the instantaneous pressure start-up circuit of closed action, can Output low voltage makes the low pressure holding circuit that A.C. contactor is kept closed；The input of power selection switch is with conventional Power supply is connected with stand-by power supply, and the outfan of power selection switch is protected with the input of instantaneous pressure start-up circuit and low pressure respectively The input holding circuit is connected, and the outfan of instantaneous pressure start-up circuit and the outfan of low pressure holding circuit leave with putting into selection Pass input is connected；Power selection switch is the power supply selective relay being provided with two groups of normally closed normally open contacts, its normally closed interlock with Conventional power supply connects, and its normally open contact is connected with stand-by power supply；Instantaneous pressure start-up circuit includes rectifier bridge, and controls moment The starting relay with double groups of normally open contacts of high-voltage starting circuit break-make；Low pressure holding circuit include capacity voltage dropping circuit with And the rectifier bridge in aforementioned instantaneous pressure start-up circuit；Wherein, capacity voltage dropping circuit is by the polarity free capacitor being resistant to power frequency high voltage Device and the discharge resistance in parallel with this non-polar condenser composition；The of the first input end of rectifier bridge and power supply selective relay One common port connect, the common port of starting relay and the input of capacity voltage dropping circuit all with the second of power supply selective relay Common port connects, the normally opened outfan of starting relay and the outfan of capacity voltage dropping circuit all with the second input of rectifier bridge Connect；Rectification bridge output end is connected with putting into the common port selecting switch.

2. the circuit for contactor type dual-power transfer switch electrical equipment as claimed in claim 1, is characterized in that: described contact Device duty detection module is the auxiliary contact being located on conventional catalyst and standby catalyst, auxiliary contact be provided with Commonly use the main contact of catalyst or the normally open contact of the main contact linkage of standby catalyst and normally closed interlock.

3. the circuit for contactor type dual-power transfer switch electrical equipment as claimed in claim 2, is characterized in that: described electrodeless Property capacitor is CBB electric capacity, and its pressure voltage is 240V ~ 1000V, and its capacity is 0.1uF ~ 2.2uF.

4. the circuit for contactor type dual-power transfer switch electrical equipment as claimed in claim 3, is characterized in that: described electric discharge Resistance is 330k Ω ~ 1000 k Ω.

5. the circuit for contactor type dual-power transfer switch electrical equipment as claimed in claim 2, is characterized in that: described electrodeless Property capacitor is safety electric capacity, and its pressure voltage is 240V ~ 600V, and its capacity is 0.1uF ~ 2.2uF.

6. the circuit for contactor type dual-power transfer switch electrical equipment as claimed in claim 5, is characterized in that: described electric discharge Resistance is 330k Ω ~ 1000 k Ω.

7. the circuit for contactor type dual-power transfer switch electrical equipment as claimed in claim 1, is characterized in that: described rectification It is in series with critesistor between bridge outfan and the common port putting into selection switch.

8. the circuit for contactor type dual-power transfer switch electrical equipment as described in any one of claim 1 ~ 7, is characterized in that: The described selection switch that puts into is at least provided with one group of normally open contact and the relay of normally closed interlock, and is defined as this relay throwing Enter selective relay.

9. the circuit for contactor type dual-power transfer switch electrical equipment as claimed in claim 8, is characterized in that: described conventional Catalyst and standby catalyst include the iron core as magnetic circuit, and iron core is the pig iron or the steel plate composition of monoblock.

10. the circuit for contactor type dual-power transfer switch electrical equipment as claimed in claim 9, is characterized in that: described often With the line footpath 90% that the line footpath of catalyst and the coil of standby catalyst is same specification A.C. contactor line coil.