CN102347168B - Low-voltage intelligent circuit breaker with plastic shell - Google Patents

Low-voltage intelligent circuit breaker with plastic shell Download PDF

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CN102347168B
CN102347168B CN201110282525.5A CN201110282525A CN102347168B CN 102347168 B CN102347168 B CN 102347168B CN 201110282525 A CN201110282525 A CN 201110282525A CN 102347168 B CN102347168 B CN 102347168B
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circuit board
voltage
switch
control circuit
mcu1
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CN102347168A (en
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胡俊兵
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胡俊兵
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Abstract

The invention relates to a low-voltage intelligent circuit breaker with a plastic shell. The low-voltage intelligent circuit breaker comprises a switch base and a switch cover, wherein the switch base is provided with four longitudinal through grooves and a transverse through groove penetrating through the longitudinal through grooves, a vacuum electromagnetic switch, a current transformer and a storage capacitor are sequentially installed in three longitudinal through grooves; another vacuum electromagnetic switch and another storage capacitor are sequentially installed in the other longitudinal through grooves, and a zero sequence transformer is installed in the transverse through groove; and a control circuit board is fixed at the upper middle of the switch base, a power module, a charging module, a phasing voltage transformer, three voltage transformer for phase selection, two main processors and two auxiliary processors, wherein the display circuit board is located in the upper middle of the control circuit board and embedded in the switch cover and provided with a display screen, a red indication lamp, a green indication lamp, a switching-in operation button, a switching-off operation button and the like. The invention has the advantages of small volume, compact structure, convenience for use and installation and capability of truly realizing comprehensive intelligence of digital protection, automatic control and communication function.

Description

A kind of low voltage plastic housing intelligent breaker
Technical field
The present invention relates to a kind of switching device for low-voltage Based Intelligent Control, especially there is the low voltage switchgear of numerical protection, automatic control, distant place communication and phase-splitting disengagement failure function of current, belong to low voltage electrical equipment field.
Background technology
Current our country has proposed the concept of development intelligent power network, wherein also comprise the intellectuality of low-voltage distribution electrical network, and the most important part of the intellectuality of low voltage electric network is the intellectuality of low-voltage circuit breaker.Intelligent low-voltage circuit breaker must have the function of general protection, automatic control, distant place communication and phase-splitting disengagement failure electric current simultaneously.At present; China just advances towards this direction; many innovation works have been done by each large professional low-voltage electrical apparatus producer and scientific research institutions; as the products such as MB60 electric appliance series of the NM7 electric appliance series of positive Thailand, the section that powers on; all these products all also belong to the primary stage of low-voltage intelligent circuit breaker, only have general defencive function and reliable communication function.And these circuit breakers all also rest in mechanical mode of operation, also use all kinds of releases based on electromagnetic principle.Therefore from use, control, defencive function, these products all fail to obtain breakthrough and the innovation of essence, also do not have intellectuality truly, and this type of circuit breaker can't be referred to as intelligent breaker.
In addition, the current low-voltage intelligent using on the market or the non intelligent breaker of plastic casing deficiency of ubiquity the following aspects also.
1, existing circuit breaker does not have intelligentized four large fundamentals, both comprehensively reliable information Perception ability; The data-handling capacity that high speed is powerful; The operation executive capability of efficient and sensible; Reliable and stable distant place ability to communicate.
2, the various defencive functions of existing circuit breaker complete by corresponding magnetictrip, complex structure, and efficiency is low, poor reliability.
3, mode of operation is mechanical system, does not consider that the integration of release and efficient blow-out is processed, and does not consider the Digital Control of various release, does not consider the integrated of release and operating mechanism.
Though 4, existing circuit breaker has been realized and partly protected freely arranging of definite value, and protect and throw the free setting moving back, can only by mechanical mode, arrange on the spot.
5,, during abnormal or fault trip, can not send in time the warning messages such as sound, light, word.
6, can not oneself whole disconnected and whether on-line monitoring situation is good.
7, control mode is on the spot, and most circuit breakers can only be controlled deciliter circuit breaker by on-site manual, do not have a distant place or distant control function, only have minority circuit breaker to have communication function, can realize a distant place and divide, close circuit breaker, but the information mutually exchanging is very limited.
8, tripping operation speed is fixed, cannot be according to fault current size free setting tripping operation speed.
9, all circuit breakers are multipole combined operation mechanism, do not have that phase selection and phasing divide, closing operation function.
Summary of the invention
The object of the invention is to provide a kind of low voltage plastic housing intelligent breaker, is and realizes numerical protection, automatically controls and comprehensive intellectuality of communication function provides a kind of carrier that can practical application, and volume is little, compact conformation, use with install all very convenient.
Technical scheme is switch base and the switch cover that includes plastic production, switch base has four longitudinal grooves and a transverse groove that connects longitudinal groove, the upper and lower end of every longitudinal groove has respectively inlet wire terminals, outlet terminals, wherein in three longitudinal grooves as A, B, C phase passage, vacuum electromagnetic switch, current transformer, storage capacitor are installed successively, in longitudinal groove as N phase passage, vacuum electromagnetic switch, storage capacitor are installed successively, zero-sequence transformer is installed in transverse groove, top, switch base middle part has been screwed control circuit board, control circuit board top is provided with power module, charging module, the phasing voltage instrument transformer that primary winding is directly connected with main power source and three primary coils respectively with A, B, the connected phase selection voltage transformer of C phase vacuum electromagnetic switch load side power line, the main processing of MCU1 and MCU2 auxiliary processor are equipped with in control circuit board middle part, two socket communications are equipped with in control circuit board bottom, on control circuit board dual-side, be provided with four signal of telecommunication connectors and the first communication gang socket, control circuit board is also provided with test relay and temperature sensor.Display circuit board is positioned at top, control circuit board middle part and is mounted in switch cover, the display circuit board left side is display screen, the right be provided with red, green indicator light, minute, closing operation button, key-press matrix human-computer dialogue for, return to button, involution button, below display circuit board, have the second communication gang socket that is communicated with use with control circuit board.Switch cover is positioned at directly over display circuit board and with fastened by screw on switch base, and bottom, switch cover surface is provided with the groove that cabling is used, and is provided with two communication sockets in the middle of groove.
Described vacuum electromagnetic construction of switch is as follows: on bobbin, be wound with coil, in bobbin, be set with vacuum porcelain tube, in vacuum porcelain tube inner chamber, be fixed with the iron core that soft magnetism pure iron is made, core center hole inner sleeve has axostylus axostyle made of copper, axostylus axostyle left end is fixed with I permanent magnet and left moving contact, and axostylus axostyle right-hand member is fixed with II permanent magnet and right moving contact, and the magnetic pole of I permanent magnet is that axial SN distributes, the magnetic pole of II permanent magnet is contrary, is axially NS distribution; Left and right end cap by Welding at the left and right end of porcelain tube, between left and right fixed contact and left and right end cap, be welded with respectively the left and right bellows of isolation, in left and right end cap center screw, be installed with respectively circuit breaker dedicated hydraulic buffer, Hall element is equipped with respectively at the bobbin two ends that are positioned at vacuum porcelain tube top, left moving contact connects left end cap through flexible cord, on left end cap outer end, have inlet wire terminals, right fixed contact is communicated with right end cap through flexible cord.
Vacuum electromagnetic switch is execution unit of the present invention, and its basic structure and operating principle are introduced in detail in No. 201020173157.1 utility model patents." vacuum electromagnetic driving switch " that the present invention proposes this patent made following improvement: the axial height that has increased left and right end cap; Left and right fixed contact is fixed on left and right end cap inner face through bellows respectively, is installed with circuit breaker dedicated hydraulic buffer (German compact company produces, and model is WSK-M0.5) in left and right end cap center screw.Why to make above-mentioned improvement? because the increase along with vacuum electromagnetic switch power and volume, require movement velocity and the also corresponding increasing of the pressure between contact of moving contact, thereby the movement velocity of the parts such as II permanent magnet, right-hand member contact, axostylus axostyle, left end moving contact, I permanent magnet is increased, inertia increases, the increase in simultaneous I, II permanent magnet volume and cross section and also corresponding increase of magnetic force.Dividing, during closing operation, cause I, the collision of II permanent magnet and iron core is serious, and high-performance permanent mechanical strength is poor, property is crisp frangible, left to electromagnetic switch in addition, right end cap also causes very large impact, therefore at the two ends of electromagnetic switch, adopt import definite purpose circuit breaker hydraulic bjuffer to cushion, to divide, severe impact during closing operation cushions, the compression energy that makes axial mechanical kinetic energy change into liquid discharges, thereby avoid the direct collision of permanent magnet and iron core, improve useful life and the reliability of electromagnetic switch, and improve its vibrations and noise level.Again because electromagnetic switch inside is vacuum, and hydraulic bjuffer can not weld together with end cap, therefore between end cap and fixed contact, designed an isolation and be connected with bellows, bellows can be together with fixed contact, end cap welding fabrication, hydraulic bjuffer can be in later stage spinning in end cap center screw.Next is the improvement of the two ends end cap of electromagnetic switch, and for energy fit on hydraulic bjuffer, the axial height of end cap has increased some.Left end cap is in the situation that axial height increases, in the upper shaft of cushion hole to increasing by a fixed head, the inlet wire link of circuit breaker namely, in the middle of fixed head, be provided with screw-socket, for fixed power source wire, fixed head diagonal is provided with two screw-sockets, for electromagnetic switch is fixed to, moulds shell base.Left end cap fixed head top has a screw-socket, for drawing, connects power line.Right end cap is axially increasing in height, directly over cushion hole, be provided with two screw-sockets, for extracting power supply cord, under cushion hole, be provided with a platform, platform the right and left is provided with two screw-sockets (not shown in FIG.) perpendicular to the centre position of hydraulic bjuffer, for electromagnetic switch being fixed to breaker of plastic casing base.Have again exactly transducer valve jacket and bobbin are combined, merge installation and the location of being together convenient to transducer.
The bus connection method of each parts of the present invention and existing Intelligent control circuit are basic identical, please refer to accompanying drawing 5, repeat no more herein.
It is core that control circuit of the present invention be take main and auxiliary two digital processing unit MCU1, MCU2.Primary processor MCU1 is responsible for protection, controls; Auxiliary processor MCU2 is responsible for operation, demonstration, communication.
Primary processor MCU1 is furnished with its inside program, communication, AD conversion, data memory unit, outside is furnished with capacitor charhing unit, 4 groups of driver elements that formed by voltage driving, IGBT power tube, storage capacitor, electromagnetic switch, current signal collecting unit, voltage signal acquisition unit, zero-sequence current collecting unit, and a modular power source unit.The circuit such as protection and control provide 5V, 15V power supply by power module; Capacitor charhing unit charges to 4 energy storage capacitors through current-limiting resistance and IGBT, and charging process is controlled by MCU1 processor and IGBT power tube, and charhing unit feeds back to charging voltage again MCU1 processor simultaneously; 4 groups of voltage drive units are controlled by MCU1, and MCU1 controls the waveform width degree that voltage drives, and with this, realizes the control to circuit breaker actuating speed.With the power that voltage drives, start IGBT power tube, make circuit breaker polarity, speed and phase sequence on request start electromagnetic switch, drive the inner moving contact action of electromagnetic switch, realize circuit breaker minute, closing operation.
Directly the signal section of input MCU1 comprises: the signals such as threephase current transformer, threephase potential transformer, zero-sequence transformer, temperature sensor, charging module feedback voltage, main power source side phasing voltage instrument transformer.Current transformer is used for gathering the current data in main circuit; for MCU1 computing; for realizing tertiary current protection, provide foundation; voltage transformer is used for gathering the voltage data in main circuit, for MCU1 computing, for realizing two sections of voltage protections, provides foundation; simultaneously also as differentiating one of criterion of circuit-breaker switching on-off; zero sequence current mutual inductor is used for the leakage current parameter in Acquisition Circuit, for MCU1 computing, for realizing one section of earth leakage protective, provides foundation.Temperature sensor is used for gathering the temperature parameter of circuit breaker inner space; for MCU1 computing; as the backup protection of circuit breaker and the foundation of failure alarm signal; charging module feedback voltage is used for gathering the voltage parameter of energy storage capacitor; for CMU1 computing; in order to realize, the speed change of circuit breaker is divided, closing operation provides basic data, then in conjunction with the size of fault current, finally determines drive waveforms and the speed of circuit breaker.Phasing voltage instrument transformer is used for gathering the parameters such as voltage in mains side main circuit, phase place, phase sequence, for realizing the phasing closing operation of the controllable phase angle of circuit breaker, provides foundation.Before all signal input MCU1, all must, through shaping and filtering, be convenient to processor collection and use.MCU1 is first converted to digital signal by analog signal, then according to preset program, require to calculate, and the result of calculating is deposited in memory, then according to the predetermined logical relation of program storing value and setting value comparison, if meet the terms and conditions that logical relation arranges, processor is exported a level signal, and this signal is through power amplification, in order to drive electromagnetic switch tripping operation.If can not meet the terms and conditions that logical relation arranges, the working procedure of processor can turn back to Gather and input signal condition, recalculates the data that next time period gathers, and then remakes logic analysis judgement, so goes round and begins again, from uninterruptedly.
Auxiliary processor MCU2 is responsible for operation, demonstration and communication, and its inside is furnished with program, communication, AD conversion, data memory unit, and outside is furnished with CAN bus unit, shows and operating unit, controls and indicating member hall position sensor collecting unit.8 Hall elements that are positioned at electromagnetic switch contact position top, export 8 road hall signals, after shaping and filtering, in input MCU2, establish AD converting unit, then according to preset program, require to calculate, and the result of calculating is deposited in memory, with standard value comparison, to judge physical location and the divide-shut brake speed of electromagnetic switch contact in circuit breaker, for realizing the reliable state indication of circuit breaker, provide mechanical type criterion, simultaneously on-line monitoring contact of breaker minute, closing speed.CAN bus unit is used for setting up reliable bus communication with outside and contacts.Show and operating unit, be used for carrying out human-computer dialogue, check various fault messages and revise various parameters.Control and indicating member, scene be used for carrying out circuit breaker minute, closing operation, indication circuit breaker minute, "on" position.
All fault message, abnormal conditions, protection definite value and the throwings of intelligent breaker are moved back and are controlled word etc.; can both be on the spot or a distant place check, process and confirm; on the spot by display interface and the cooperation of human-computer dialogue unit; can inquire easily all fault messages, abnormal conditions, protection definite value and throwing and move back information such as controlling word, and revise and confirm these information.In strange land, by CAN bus, set up communication, use and have the middle control device of human-computer interaction interface and PC that various parameters are freely set, and inquire about the word warning message that circuit breaker sends.
In order to ensure the earth leakage protective high security of intelligent breaker and reliability; be specially provided with earth leakage protective automatic gauging circuit; and circuit breaker divides, closes a floodgate and drives loop detection circuit; by MCU1, control periodical test, detect a whole set of circuit, comprise the parts such as start-up circuit, transducer, MCU1 processor, amplification driving circuit, IGBT power tube, solenoid winding.
Output circuit comprises: charging module control circuit, and controlled by MCU1 processor, at processor, send the disjunction that command signal is controlled the IGBT power tube in charging module, make capacitor with charge power supply isolation or be communicated with, the charging of control capacitor or stop charging.Electromagnetic switch drive circuit, by MCU1, provide driving signal, start 4 road voltage drivers, drive again the direct current reversing circuit and the power amplification circuit that by IGBT power tube device, are formed, and finally drive the contact of 4 electromagnetic switch inside to move, realize circuit breaker minute, closing operation, drive energy is provided by energy storage capacitor.Drive circuit of indicator by MCU1 to MCU2 provide minute, switching voltage determines signal and position memory signal, MCU2 is the position signalling of combination zero your transducer again, judge circuit breaker minute, "on" position, red, the green indicator light of driving LED shows the splitting or integrating lock state of circuit breaker.Circuit breaker trip or while breaking down, drive red, green indicator light ceaselessly glittering, represent that circuit breaker has fault or trip condition, prompting user: " circuit breaker and circuit have fault or abnormal conditions to need to process ", on the spot by can check the information such as fault content, character, time on man-machine dialog interface, after checking, pressing involution button will slot signal, and indicator light stops glittering.The information such as fault content, character, time can be checked equally in a distant place, by carrying out involution icon, operate slot signal.Communication drive circuit drives CAN bus control unit and higher controller or PC to carry out both-way communication by MCU2 and contacts, to reach the object of remote monitoring, control.
The control of intelligent breaker, protection, communication supervisor, be solidificated in the processor chips of MCU1 and MCU2, so that complete every control, protection, communication function, the digitlization of round Realization breaker of plastic casing, intellectuality.
It is as follows that the present invention has advantage:
1, circuit breaker meets intelligentized four large fundamentals comprehensively, both comprehensively reliable information Perception platform; The data processing platform (DPP) that high speed is powerful; Platform is carried out in the operation of high efficient and reliable; Rapid stable strange land communication platform.
2, circuit breaker round Realization digital protection and control function; defencive function is powerful complete; be provided with and comprise that three sections, electric current, two sections of voltages, zero sequence one section, section equate protection; many condition composite protections of high reliability can also be set; the startup of all protections and operate time all can freely arrange, the input of all protections or exit all and can freely arrange.
3, breaker operator electronization, efficiency simple to operate is high, minute, closing speed can regulate arbitrarily, and can be according to the big or small free setting tripping operation speed of real time fail electric current.
4, the single-phase vacuum electromagnetic switch platform of circuit breaker based on excellent, is easy to realize single-phase independent design and single-phase operating function.
5, circuit breaker is realized closing operation with the mode of operation of phasing, in the mode of phase-splitting, realizes sub-switching operation, realizes the synthetic operation effect of circuit breaker the best.
6, breaker operator is convenient, simple, reliable, and state recognition is clear, has on the spot and remote operation function.
7, circuit breaker all meets selectivity, rapidity, sensitivity, the reliability requirement of Microcomputer Protection.
8, circuit breaker has remote control, remote regulating, remote signalling, telemetry function.
9, circuit breaker has self-diagnosing function, whether well can regularly detect the circuit such as control, driving, power supply, communication.
10, circuit breaker has real-time communication function and regularly automatically detects creepage protection function.
11, circuit breaker has the function that warning message is checked in a distant place online, revises the function of protection definite value, and sets protection and throw the function of moving back.
12, circuit breaker round Realization contactless design, optimizes whole synthesis performance.
13, vacuum electromagnetic switch has been realized standardization, modularization, General design.
In a word, the brand-new shell intelligent breaker of moulding is the full Intelligent switch of really having realized digital protection, automation control and communication function.
Accompanying drawing explanation
Fig. 1 is low voltage plastic housing intelligent breaker three-dimensional appearance figure
Fig. 2 is low voltage plastic housing intelligent breaker three-dimensional structure decomposing schematic representation
Fig. 3 is vacuum electromagnetic switch three-dimensional cross-sectional figure
Fig. 4 is vacuum electromagnetic switch three-dimensional structure decomposing schematic representation.
Fig. 5 moulds shell intelligent breaker Intelligent control circuit block diagram.
Fig. 6 is charging module circuit diagram.
Fig. 7 is earth leakage protective automatic gauging circuit diagram.
Embodiment
As Figure 1-5, the present invention includes switch base 1 and the switch cover 20 of plastic production, switch base 1 has four longitudinal grooves and a transverse groove that connects longitudinal groove, the upper and lower end of every longitudinal groove has respectively inlet wire terminals 7, outlet terminals 8, wherein in three longitudinal grooves as A, B, C phase passage, vacuum electromagnetic switch 3, current transformer 4, storage capacitor 5 are installed successively, vacuum electromagnetic switch 3, storage capacitor 5 are installed in the longitudinal groove as N phase passage successively, zero-sequence transformer 6 is installed in transverse groove, switch base 1 top, middle part has been screwed control circuit board 2, control circuit board 2 tops are provided with power module 10, charging module 11, the phasing voltage instrument transformer 12 that primary coil is directly connected with main power source and three primary coils respectively with A, B, the voltage transformer 13 for phase selection that C phase vacuum electromagnetic switch 3 load side power lines are connected, MCU1 primary processor 14 and MCU2 auxiliary processor 15 are equipped with in control circuit board 2 middle parts, two socket communications 16 are equipped with in control circuit board 2 bottoms, on control circuit board 2 dual-sides, be provided with four signal of telecommunication connectors 17 and the first communication gang socket 18, control circuit board 2 is also provided with test relay and temperature sensor, display circuit board 19 is positioned at control circuit board 2 tops, middle part and is mounted in switch cover 20, display circuit board 19 left sides are display screen 21, the right is provided with red, green indicator light 22,23, minute, closing operation button 24, key-press matrix 25 for human-computer dialogue, return to button 26, involution button 27, there is the second communication gang socket 28 that is communicated with use with control circuit board 2 display circuit board 19 belows, switch cover 20 is positioned at directly over display circuit board and with fastened by screw on switch base 1, and the groove 9 that the surperficial bottom of switch cover 20 has cabling to use is provided with two communication sockets 16 in the middle of groove 9.
Described vacuum electromagnetic switch 3 structures are as follows: on bobbin 31, be wound with coil 32, in bobbin 31, be set with vacuum porcelain tube 33, in vacuum porcelain tube 33 inner chambers, be fixed with the iron core 35 that soft magnetism pure iron is made, iron core 35 centre bore inner sleeves have axostylus axostyle 34 made of copper, axostylus axostyle 34 left ends are fixed with I permanent magnet 36 and left moving contact 37, axostylus axostyle 34 right-hand members are fixed with II permanent magnet 38 and right moving contact 39, the magnetic pole of I permanent magnet 36 is that axial SN distributes, the magnetic pole of II permanent magnet 38 is contrary, is axially NS distribution; Left and right end cap 40,41 by Welding on the left and right two ends of porcelain tube 33, between left and right fixed contact 42,43 and left and right end cap 40,41, be welded with respectively left and right bellows 48,44 for isolation, in left and right end cap 40,41 center screws, be installed with respectively circuit breaker dedicated hydraulic buffer 30,45, Hall element 46,47 is equipped with respectively at bobbin 31 two ends that are positioned at vacuum porcelain tube 33 tops, left moving contact 37 connects left end cap 40 through flexible cord, left end cap 40 is turned left and is extended to inlet wire terminals 7, and right fixed contact connects right end cap 41 through flexible cord; In vacuum porcelain tube 33, remain vacuum environment.
The workflow of the present embodiment is as follows:
When intelligent breaker is in place, and confirm that circuit breaker is after open position, can charge to circuit breaker.First power module starts, for each several part circuit provides power supply, MCU1 and MCU2 obtain electric startup self check, and the glittering red light of green light goes out, now circuit breaker can not realize minute, closing operation, then check each hardware circuit, MCU1 checks that whether charging module is normal, and whether charging voltage is normal, checks that whether combined floodgate circuit is normal, check that phasing voltage instrument transformer is no normal, and the parameter information such as phase place, voltage.When MCU1 processor completes every detection, confirm normal.Simultaneously, MCU2 obtains electric self check with it, whether normally detects the functions such as interactive system, communication system, control system, after normal with reference to the self-detection result of MCU1, point gives a green light, extinguishes red light, and circuit breaker, in dormant state, can be carried out the operation of combined floodgate power transmission at any time.If it is undesired to detect, green light continuation is glittering, and circuit breaker can not be realized closing operation.
Local operation switch knob, or from the controller of a distant place, there is instruction and carry out closing operation, MCU2 processor is received after reclosing command, to MCU1 processor, send switching signal immediately, start 4 groups of voltage drivers, then drive 4 IGBT power tubes, by the polar requirement closing a floodgate, with the closing speed being applicable to, 4 discrete electric magnetic switches are closed simultaneously, realize the closing operation of circuit breaker.The new combined floodgate for the first time that circuit breaker is installed is because determining phase place and the phase sequence of power supply, so breaker closing mode is 4 utmost point asynchronous switch-ons operations.After circuit breaker closes, extinguish green light red lamp flass, MCU1 primary processor is carried out a series of task: detect threephase current transformer signal, starting protection program; Detect threephase potential transformer signal, detect phase sequence A, B, C, D, N and the phase place of main circuit, the signal that comprehensive phasing instrument transformer provides, judges the phase sequence of phasing instrument transformer in whole phase sequence, MCU1 primary processor records this phase sequence, carries out the foundation of phasing closing operation as next time; Whether normally detect leakage protection circuit and trip(ping) circuit; MCU2 detects Hall element signal simultaneously, and integrated voltage transducer signal confirms that 4 utmost points of circuit breaker close simultaneously; Detect breaker closing speed and meet the requirements, the consistency that detects 4 utmost points combined floodgates is normal; After all these detections complete, confirm that circuit-breaker status is good, red light stops glittering, enters normal operating condition.
While there is short trouble in load side circuit, electric current sharply increases, the several times that reach normal electrical flow valuve are even larger, MCU1 processor is by improper current parameters and setting value comparison, confirm to go out greatly setting value how many, and in conjunction with the voltage of storage capacitor, the comprehensive opening velocity of determining electromagnetic switch, the phase sequence detecting according to MCU1 processor again, phase place, select each tripping operation order mutually nearby, export fast tripping operation waveform, polarity and each be tripping operation order mutually, thereby start corresponding voltage driver, drive IGBT power tube, the phase-splitting of shell intelligent breaker is moulded in realization, high-speed tripping operation, protective circuit breaker is with high speed, efficiently, the mode open failure electric current of safety, guarantee the safety of main electrical network, stable, reliability service.After tripping operation, the red light green light that goes out is glittering, and sends corresponding word warning message, and reminding user is processed and confirmed that fault-signal, fault-signal do not affect the normal operation of circuit breaker itself, only open suggesting effect.
While carrying out sub-switching operation under normal circumstances, circuit breaker, according to the phase sequence of power supply and phase angle, is selected tripping operation order nearby, with suitable breaking speed, and each utmost point vacuum electromagnetic switch of phase-splitting tripping, wherein N extremely finally disconnects.The red light green light of going out after separating brake.No matter circuit breaker this in closing or open position, can be on the spot or a distant place check the warning message of circuit breaker, and confirm.
When again closing circuit breaker, MCU1 primary processor is A, B, C, N phase sequence with record, then the phase place providing in conjunction with phasing instrument transformer, and with the phase sequence of fixing and suitable speed, phase-splitting each utmost point vacuum electromagnetic switch that closes, wherein N level is closed at first.After closing a floodgate, when red green light goes out.So far circuit breaker steps in the middle of normal use.If mains side power-off, circuit breaker detects the phase sequence of power supply again, and automatic record.
In the present embodiment, the structure of charging module 11 as shown in Figure 6, the input termination 220V ac main power of rectifier bridge D, rectifier bridge D positive output end and IGBT power tube Q 6drain electrode be connected, Q 6source electrode and current-limiting resistance R 4head end is connected, Q 6grid be connected with voltage driver IC, IC output connects MCU1 primary processor 14; Diode Z 3, Z 4, Z 5, Z 6respectively with four storage capacitor C a, C b, C c, C nafter series connection, be parallel to again current-limiting resistance R 4on tail end and rectifier bridge D negative output terminal, divider resistance R 5, R 6, R 7after series connection, be parallel to equally resistance R 4on tail end and rectification bridge output end, zener diode Z 7with divider resistance R 7parallel connection, to MCU1 output sampling voltage.
When main power source is charged, MCU1 primary processor starting resistor driver IC, voltage driver IC drives IGBT power tube Q 6conducting, power supply is through current-limiting resistance R4 to the charging of energy storage capacitor group, and the charging interval is shorter, is generally no more than 2 seconds, and after energy storage capacitor is full of, charging finishes standby.Its voltage parameter feeds back to MCU1 processor by sample circuit, and sample circuit voltage is 3V, the highest 5V that is no more than, as determine divide-shut brake speed according to one of, Z 3, Z 4, Z 5, Z 6for single-phase conducting diode, each capacitor phase mutual interference while preventing that circuit breaker from dividing, closing a floodgate, IGBT power tube Q when circuit breaker divides, closes a floodgate 6disconnect.
As shown in Figure 7, the present embodiment is provided with A phase earth leakage protective automatic gauging circuit on control circuit board 2, i.e. one of MCU1 primary processor group of output pin joint test relay J, and J is through resistance R 1be connected on 220V power supply, zero-sequence transformer T0 output is connected on low-power consumption amplifier ic chip 5, IC5 output connects MCU1 primary processor, and another three groups of output pins of MCU1 connect respectively voltage and drive ic chip 1, IC2, IC3, and two output pins of IC3 connect respectively IGBT power tube Q 1, Q 2grid, two output pins of IC2 connect respectively IGBT power tube Q 3, Q 4grid, IC1 output pin connects IGBT power tube Q 5grid; Storage capacitor Ca positive pole and IGBT power tube Q 1, Q 3drain electrode is with diode Z 1be connected, one end of inductance coil L connects Q 1source electrode, Q 2drain electrode, the J other end connects Q 3source electrode, Q 4drain electrode, resistance R 2one end and Q 2, Q 4source electrode, Q 5drain electrode is connected, resistance R 2the other end and resistance R 3, voltage stabilizing didoe Z 6negative pole is connected, resistance R 3the other end and Q 5source electrode, Z 2anodal, capacitor C a negative pole is connected, Z 2negative pole connects photoelectrical coupler IC4 input, and IC4 output connects MCU1 primary processor.The earth leakage protective automatic gauging circuit of other B, C, N phase is mutually the same with A.
How long automatically product Ke You producer or user set is voluntarily detected earth leakage protective once.When circuit breaker is at closing position, and in main circuit, there is voltage and during again to Check-Out Time, MCU1 sends a pulse checking signal makes test relay J normal opened contact closed, through resistance R 1220V AC power is connected, open fast again subsequently, manufacture artificially a short time leakage current, zero-sequence transformer T0 checks electric leakage signal, sends low-power consumption amplifier ic chip 5 to, signal inputs to MCU1 and processes, calculates after amplifying arrangement, then with the comparison of setting definite value, be greater than after set point, send the instruction of check separating brake drive circuit, MCU1 starting resistor drives ic chip 1-IC3, disconnects IGBT pipe Q 1, Q 4, Q 5, closed IGBT power tube Q 3, Q 2, make the power supply of storage capacitor Ca from positive pole, through IGBT pipe Q 3, inductance coil L, IGBT manage Q 2, voltage forms resistance R 2, R 3flow back into capacitor C a negative pole, in resistance R 3the voltage of 3V of upper generation left and right, this voltage through IC4 Isolation input to MCU1, with standard value relatively after, finally judge that whether leakage protection loop good, when undesired, send light and word alarm signal.Equally also can pass through closed Q 1, Q 4, disconnect Q 3, Q 2, Q 5whether normally detect closing circuit, the detection waveform of strict control circuit in checkout procedure, guarantees that test voltage is lower than 5V, and select suitable resistance, to hinder large electric current, pass through, making the signal power of hookup is only 0.5% of normal running, guarantees not drive electromagnetic switch to move in test.Z 2for voltage stabilizing didoe, be used for protecting the numerical value of sampled voltage in certain number range.

Claims (4)

1. a low voltage plastic housing intelligent breaker, it is characterized in that comprising switch base (1) and the switch cover (20) of plastic production, switch base (1) has four longitudinal grooves and a transverse groove that connects longitudinal groove, every longitudinal groove upper, there are respectively inlet wire terminals (7) lower end, outlet terminals (8), wherein as A, B, in three longitudinal grooves of C phase passage, vacuum electromagnetic switch (3) is installed successively, current transformer (4), storage capacitor (5), vacuum electromagnetic switch (3) is installed in the longitudinal groove as N phase passage successively, storage capacitor (5), zero-sequence transformer (6) is installed in transverse groove, top, switch base (1) middle part has been screwed control circuit board (2), control circuit board (2) top is provided with power module (10), charging module (11), the phasing voltage instrument transformer (12) that primary coil is directly connected with main power source and three primary coils respectively with A, B, the voltage transformer for phase selection (13) that C phase vacuum electromagnetic switch (3) load side power line is connected, MCU1 primary processor (14) and MCU2 auxiliary processor (15) are equipped with in control circuit board (2) middle part, two socket communications (16) are equipped with in control circuit board (2) bottom, on control circuit board (2) dual-side, be provided with four signal of telecommunication connectors (17) and the first communication gang socket (18), control circuit board (2) is also provided with test relay and temperature sensor, display circuit board (19) is positioned at top, control circuit board (2) middle part and is mounted in switch cover (20), display circuit board (19) left side is display screen (21), the right be provided with red, green indicator light (22,23), minute, closing operation button (24), button matrix (25) human-computer dialogue for, return to button (26), involution button (27), below display circuit board (19), have the second communication gang socket (28) that is communicated with use with control circuit board (2), switch cover (20) is positioned at directly over display circuit board (19) and with fastened by screw on switch base (1), the surperficial bottom of switch cover (20) is provided with the groove (9) that cabling is used, and is provided with two communication sockets (29) in the middle of groove (9).
2. low voltage plastic housing intelligent breaker according to claim 1, it is characterized in that described vacuum electromagnetic switch (3) structure is as follows: on bobbin (31), be wound with coil (32), in bobbin (31), be set with vacuum porcelain tube (33), in vacuum porcelain tube (33) inner chamber, be fixed with the iron core (35) that soft magnetism pure iron is made, iron core (35) centre bore inner sleeve has axostylus axostyle made of copper (34), axostylus axostyle (34) left end is fixed with I permanent magnet (36) and left moving contact (37), axostylus axostyle (34) right-hand member is fixed with II permanent magnet (38) and left moving contact (39), the magnetic pole of I permanent magnet (36) is that axial SN distributes, the magnetic pole of II permanent magnet (38) is contrary, for axially NS distribution, left, right end cap (40, 41) by Welding on porcelain tube (33) left side, on right two ends, on a left side, right fixed contact (42, 43, ) and left, right end cap (40, 41) between, be welded with respectively isolation with left, right bellows (48, 44), on a left side, right end cap (40, 41) in center screw, be installed with respectively circuit breaker dedicated hydraulic buffer (30, 45), Hall element (46 is equipped with respectively at bobbin (31) two ends that are positioned at vacuum porcelain tube (33) top, 47), left moving contact (37) connects left end cap (40) through flexible cord, left end cap (40) is turned left and is extended to inlet wire terminals (7), right fixed contact (43) connects right end cap (41) through flexible cord.
3. low voltage plastic housing intelligent breaker according to claim 1, is characterized in that the structure of charging module (11) is as follows: the input of rectifier bridge D connects 220V AC power, rectifier bridge D positive output end and IGBT power tube Q 6drain electrode is connected, Q6 source electrode and current-limiting resistance R 4head end is connected, Q 6grid is connected with voltage driver IC output, and IC output connects MCU1 primary processor (14); Diode Z 3, Z 4, Z 5, Z 6after connecting with four storage capacitor Ca, Cb, Cc, Cn respectively, be parallel to again on current-limiting resistance R4 tail end and rectifier bridge D negative output terminal divider resistance R 5, R 6, R 7after series connection, be parallel to equally resistance R 4on tail end and rectifier bridge D output, zener diode Z 7with divider resistance R 7in parallel.
4. low voltage plastic housing intelligent breaker according to claim 1, is characterized in that being provided with on control circuit board (2) earth leakage protective automatic gauging circuit, i.e. one of MCU1 primary processor group of output pin joint test relay J, and J is through resistance R 1be connected on 220V power supply, zero-sequence transformer T0 output is connected to low-power consumption amplifier ic chip 5upper, IC 5output connects MCU1 primary processor, and another three groups of output pins of MCU1 connect respectively voltage and drive ic chip 1, IC 2, IC 3, IC 3two output pins connect respectively IGBT power tube Q 1, Q 2grid, IC 2two output pins connect respectively IGBT power tube Q 3, Q 4grid, IC1 output pin connects IGBT power tube Q 5grid; The positive level of storage capacitor Ca and IGBT power tube Q 1, Q 3drain electrode and diode Z 1negative pole is connected, and one end of inductance coil L connects Q 1source electrode, Q 2drain electrode, L 4the other end connects Q 3source electrode, Q 4drain electrode, resistance R 2one end and Q 2, Q 4source electrode, Q 5drain electrode is connected, resistance R 2the other end and resistance R 3, voltage stabilizing didoe Z 6negative pole is connected, resistance R 3the other end and Q 5source electrode, Z 2anodal, capacitor C a negative pole is connected, Z 2negative pole connects photoelectrical coupler IC 4input, IC 4output connects MCU1 primary processor.
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CN105305434A (en) * 2015-11-12 2016-02-03 天津市百利电气有限公司 Intelligent controller and control method for universal low-voltage circuit breaker capable of automatically starting in case of human body approaching
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