CN202050245U - Three-phase intelligent composite switching device - Google Patents
Three-phase intelligent composite switching device Download PDFInfo
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- CN202050245U CN202050245U CN 201120064231 CN201120064231U CN202050245U CN 202050245 U CN202050245 U CN 202050245U CN 201120064231 CN201120064231 CN 201120064231 CN 201120064231 U CN201120064231 U CN 201120064231U CN 202050245 U CN202050245 U CN 202050245U
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- circuit
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- microprocessor
- switching device
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The utility model discloses a three-phase intelligent composite switching device, comprising a microprocessor control circuit, a power supply circuit, a silicon controlled rectifier switching circuit, a contactor switching circuit, an AC zero cross detection circuit, an alarm circuit and a network communication circuit. The microprocessor is connected with the AC zero cross detection circuit through an optical coupler; the AC zero cross detection circuit is connected with a power transmission line; the microprocessor is connected with a relay through a driving circuit; a silicon controlled rectifier module is parallelly connected with the contact of an AC contactor and connected to a compensation capacitor, and is capable of realizing precise reactive compensation. In the switching process, the microprocessor firstly controls the silicon controlled rectifier switching circuit, and then controls the operation of the contactor switching circuit, under this state, the circuit is connected through a silicon controlled rectifier when the contact of the contractor is switched on, therefore no surge or arc is generated when the contact is switched on or switched off, the compensation capacitor is protected from being impacted by the surge current, thus ensuring the service life of the contactor, as well as the security and reliability of switching. The microprocessor, provided with RS 232 and RS 485 communication ports for connecting with communication modules to form a network, can monitor the operation state of a composite switch. The alarm circuit executes alarm function under power phase lack, contact failure of the contactor, as well as overvoltage and undervoltage of power supply.
Description
(1) technical field
The utility model relates to a kind of three-phase intelligent composite switching device, and particularly a kind of reactive power compensation device that is used for switches the three-phase intelligent composite switching device that power capacitor carries out switch control.
(2) background technology
Alternating current is in by pure resistance, electric energy has all changed into heat energy, and in by pure capacitive or pure inductive load, do not do work. that is to say does not have consumed power, is reactive power. actual loading certainly, can not be pure capacitive load or pure inductive load, generally all be the Combination load, electric current just has the part electric energy not do work by in them like this, be exactly reactive power, this moment
Power factorLess than 1,, will carry out reactive power compensation in order to improve the utilance of electric energy.Method commonly used is a shunt compensation power capacitor on the line, and as switching device, there is such or such problem in these two kinds of switching devices all the time in the actual field use with contactor or controllable silicon.
A.C. contactor is that contact resistance is little as its advantage of switching device, the switching time is slower, in the switching process, be easy to generate and shove, under big electric current high voltage situation, easily produce spark and electric arc, long-term its contact of using is very easy to the sintering adhesion, has a strong impact on switching device and compensates electric capacitor life-span.
Controllable silicon is that response speed is fast as its advantage of switching device, can overcome the problem of shoving.But there is power consumption controllable silicon in itself, when high-power applications, has tangible heating, because controllable silicon reaches overcurrent, overvoltage the sensitiveness of dv/dt is also damaged than being easier to.In actual applications, the switching device fault is to damage caused by controllable silicon mostly.
Learn that by above analysis we need and a kind ofly can take into account above two kinds of switching device advantages, overcome the switching device of existence, Here it is three-phase intelligent composite switching device to topic.
(3) summary of the invention
1. the purpose of the present utility model is to be to have increased control circuit not changing on original A.C. contactor architecture basics, three-phase alternating-current supply A/B/C sends into sampled signal by photoelectric isolating circuit (4) the A/D mouth of microprocessor control circuit (6) by alternating current sampling circuit (2); Microprocessor control circuit (6) output signal control contactor control circuit (9); Microprocessor control circuit (6) output signal control SCR control circuit (10); Contacts of contactor is connected in parallel with controllable silicon and links to each other with compensation condenser.Among above control procedure, microprocessor control controllable silicon and contactor carry out the switching action, with controllable silicon use in parallel with contacts of contactor, realize voltage zero-cross input and current over-zero excision by controllable silicon, pass through continuous current by the contactor contact, so just avoid silicon controlled conduction loss problem, also avoided capacitor shoving when dropping into.
The present utility model is implemented by the following technical programs.
1. in the switching process of capacitor,, tend between its contact, produce stronger arc damage contact, cause the contact loose contact, even the phenomenon of contact fusion can take place contact type switch; To the contactless type switch of controllable silicon, because of its power consumption is big, heating problem is particularly outstanding.At above-mentioned situation, during the design of three-phase intelligent composite switching device, increased delay circuit.When opening, the conducting of controllable silicon elder generation, 2～3 all after dates of delaying time, the contactor closure, controllable silicon turn-offs, and the loaded work piece electric current is provided by contactor; When turn-offing, the conducting of controllable silicon elder generation, contactor turn-offs, and controllable silicon postpones 2～3 all after dates and turn-offs.Like this, solved fundamentally that contactor occurs when turning on and off shove and contact between the arcing phenomenon, also eliminated the heating problem of noncontacting switch, the useful life that makes switch is near its mechanical endurance, both prolong the useful life of switch greatly, improved reliability of system operation again.Shown in the software main program flow process accompanying drawing 3.
2. traditional contactor can produce a large amount of harmonic waves when dropping into electric capacity, polluted electrical network, also reduced simultaneously the useful life of electric capacity, and this three-phase intelligent composite switching device adopts advanced microprocessor, unique PCB design technology, antijamming capability is strong, can detect zero-crossing of alternating current accurately, make electric capacity in the zero crossing input, no harmonic wave does not have to impact sees accompanying drawing 4.The employing A.C. contactor is an actuator, and its contact ability is strong, and overcurrent is big, is difficult for burning the contact, and having remedied domestic just is the common three-phase intelligent composite switching device contact weak point of switching mechanism with the magnetic latching relay.There was a mechanical failure or overvoltage appears in line voltage when three-phase intelligent composite switching device, under-voltage, phase shortage, during serious the distortion, three-phase intelligent composite switching device refusal drops into, and by RS232/485 relevant information is passed to the host computer procedure of master-control room, and the monitor staff can in time be pinpointed the problems.
(4) description of drawings
Accompanying drawing 1 is a three-phase intelligent composite switching apparatus system block diagram
Accompanying drawing 2 is the silicon control zero-cross circuits for triggering
Accompanying drawing 3 is a three-phase intelligent composite switching device program structure diagram
Accompanying drawing 4 be three-phase intelligent composite switching device when dropping into electric capacity moment waveform
Accompanying drawing 5 is a three-phase intelligent composite switching schematic diagram of device
(5) embodiment
Embodiment is seen accompanying drawing 5.
1. power-supply system principle: getting the A phase voltage is supply power voltage, through Industrial Frequency Transformer T1, and by diode D3, D4, D5, D6, C1, the C3 rectifying and wave-filtering, output 5V direct voltage is given single-chip microcomputer STC and drive circuitry thereof after the voltage-stabiliser tube U5 voltage stabilizing.
2. controllable silicon trigger theory: thyristor gating circuit is by controllable silicon Q1, Q2, Q3, Q4 and optocoupler U6, U7, U8, U9, resistance (R11～R21), capacitor C 6, C7, diode M1, M3 forms, and the circuit working principle is when single-chip microcomputer receives outside switching signal and detects zero crossing, single-chip microcomputer pin P1.1, P1.2 is changed to high level successively, optocoupler U6, U7, U8, U9 receive from single-chip microcomputer pin P1.1, the high level signal of P1.2, optocoupler U6 then, U7, U8, the conducting of U9 side of isolation, optocoupler U6, the U7 conducting makes B cross streams voltage by R13, and R14 triggers controllable silicon Q1 behind the R15 electric resistance partial pressure, the G utmost point of Q2, Q1, Q2 conducting then B phase electric capacity drops into.Optocoupler U8, the U9 conducting makes C cross streams voltage by R19, and R20 triggers controllable silicon Q3 behind the R21 electric resistance partial pressure, the G utmost point of Q4, Q3, Q4 conducting then C phase electric capacity drops into.As single-chip microcomputer pin P1.1, after P1.2 is changed to low level, optocoupler U6, U7, U8, the U9 side of isolation is ended, controllable silicon Q1, Q2, Q3, the G utmost point of Q4 can't obtain voltage, ends excision electric capacity at the ac zero-crossing point controllable silicon.R11, R17, capacitor C 6, C7 forms the RC spike and absorbs circuit, and the peak voltage that produces when eliminating capacitor switching is avoided and can be punctured for silicon.R12, R18 are piezo-resistance, effectively absorb surge voltage, with protection controllable silicon and optocoupler.
3. zero passage detection, phase shortage, combined floodgate separating brake control principle: B mutually with the C 150K resistance of connecting respectively mutually, current limliting after-current (I=U/R=380V/150K=2.53mA) flows through optocoupler U2, U3 light-emitting diode side, after AC signal is isolated through photoelectricity, transfer to the I/O mouth P3.3 of single-chip microcomputer, P3.4 pin, P3.3 are that C phase zero crossing detects pin, and P3.4 is that B phase zero crossing detects pin, single-chip microcomputer does not stop to detect P3.3 always, P3.4 pin state, when AC signal was in zero crossing, then single-chip microcomputer detected high level; When non-zero crossing, detect and be low level.If P3.3, the P3.4 pin is the phase voltage phase shortage of high level explanation corresponding pin at 1S with interior the detection always, and then red alarm indicator light D-red shows, three-phase intelligent composite switching device miss operation.By terminal J3,,, illustrate that then three-phase intelligent composite switching device receives outside switching signal from outside switching signal (5V-12vDC) in case pin P1.6 detects low level through being connected to single-chip microcomputer pin P1.6 after the optocoupler U4 isolation.After three-phase intelligent composite switching device receives outside switching signal, and in 20ms, detect zero crossing, trigger thyristor gating circuit simultaneously, after 2～3 ms time-delays, contactor closure, electric capacity input.After outside switching signal (5V-12vDC) disappeared, when pin P1.6 detected high level, controllable silicon was triggered, and contactor flicks, and behind the time-delay 300ms, withdrew to supply the silicon triggering signal, and the controllable silicon current over-zero is from turn-offing excision electric capacity.
4. overvoltage/undervoltage principle: JA1 gets B by terminal, and C line voltage is through diode D8 rectification, resistance R A1, RA2, RA7, the RA8 dividing potential drop, voltage-stabiliser tube DZ1, DZ2, after the DZ3 voltage stabilizing, obtain+3v (overvoltage comparator AR1 reference voltage) ,+1.5v (under-voltage comparator AR2 reference voltage), + 5v (comparator supply power voltage), with B, output voltage V 1 after the filtering of C line voltage resistance-capacitance depressurization, V1 inserts overvoltage comparator AR1 end of oppisite phase, under-voltage comparator AR2 in-phase end respectively.When V1 greater than AR1+3v reference voltage comparator output low level then, when V1 less than AR2+1.5v reference voltage comparator output high level then, comparator AR1, AR2 output is through optocoupler U11, and U12 is connected to single-chip microcomputer pin P3.6, P1.0, when P3.6 receives low level, B then is described, C top-stitching electric voltage over press, when P1.0 receives high level, then single-chip microcomputer judges that this phase voltage is under-voltage.Under the overvoltage/undervoltage situation, red alarm indicator light D-red shows, three-phase intelligent composite switching device miss operation.
5. A.C. contactor drive principle: this circuit is by relay R ELAY-SP9T and triode Q1, and resistance R 22 is formed, and single-chip microcomputer pin P3.7 is changed to high level and drives triode Q1, drives contactor and makes its closure thereby Q1 drives relay R ELAY-SP9T.
6.LED displaying principle: LED light is made up of a green LED D-blue and emitting red light two utmost point D-red pipe respectively, green LED is the normal indicator light of power supply and with the flicker of time of every 0.5S, the operation of expression three-phase intelligent composite switching device is normal, red light emitting diodes is the abnormity of power supply indicator light, when the input voltage phase shortage appears in three-phase intelligent composite switching device, overvoltage/undervoltage, the contactor loose contact, output does not connect faults such as load, then green LED D-blue extinguishes, and red light emitting diodes D-red is long bright.
7.RS232 serial ports principle: this circuit is formed U13 by a MAX232 chip U13 and communication interface J10 and is connected with single-chip microcomputer RXD/TXD pin, single-chip microcomputer passes through pin TXD the every state information of three-phase intelligent composite switching device, send to MAX232 chip U13, by communication interface data are sent to the master-control room upper computer software after over level transforms, the monitor staff can monitor the running status of three-phase intelligent composite switching device so that safeguard timely and effectively by upper computer software.
Claims (2)
1. a three-phase intelligent composite switching device is characterized in that three-phase alternating-current supply A/B/C is sent to photoelectric isolating circuit (4) by alternating current sampling circuit (2) with signal, sends into the A/D mouth of microprocessor control circuit (6) through the sampled signal after isolating; Microprocessor control circuit (6) output signal control contactor control circuit (9); Microprocessor control circuit (6) output signal control SCR control circuit (10); Contactor touches to be connected in parallel with controllable silicon and links to each other with compensation condenser.
2. it is characterized in that according to the described a kind of three-phase intelligent composite switching device of claim 1 outputs state detection circuit (5) detects contacts of contactor fault-signal, power supply phase shortage and overvoltage, under-voltage signal, and above-mentioned signal microprocessor control circuit (6) control warning circuit (8) given on-the-spot sound and light alarm, simultaneously this signal is uploaded to the control room by RS232/485 communicating circuit (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120064231 CN202050245U (en) | 2011-03-11 | 2011-03-11 | Three-phase intelligent composite switching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120064231 CN202050245U (en) | 2011-03-11 | 2011-03-11 | Three-phase intelligent composite switching device |
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| CN202050245U true CN202050245U (en) | 2011-11-23 |
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| CN 201120064231 Expired - Fee Related CN202050245U (en) | 2011-03-11 | 2011-03-11 | Three-phase intelligent composite switching device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102946106A (en) * | 2012-11-27 | 2013-02-27 | 常州市宏大电气有限公司 | Silicon controlled rectifier combination switch |
| CN102957157A (en) * | 2012-11-27 | 2013-03-06 | 常州市宏大电气有限公司 | Silicon controlled composite switch of intelligent zero-crossing switching |
| CN103023044A (en) * | 2012-11-27 | 2013-04-03 | 常州市宏大电气有限公司 | Combination switch with intelligent zero-crossing switching function |
| CN103904660A (en) * | 2014-03-24 | 2014-07-02 | 郑成锋 | Composite contactor |
| CN106877772A (en) * | 2017-01-04 | 2017-06-20 | 李振久 | A kind of three-phase contactless alternating-current switch of alternative A.C. contactor |
| CN111711202A (en) * | 2020-06-30 | 2020-09-25 | 合肥众甫工业技术有限公司 | Reactive compensation capacitor switching device based on three-phase four-wire system power grid |
| CN112531886A (en) * | 2020-10-26 | 2021-03-19 | 国网内蒙古东部电力有限公司电力科学研究院 | Power distribution station area mobile monitoring platform device, system and method |
-
2011
- 2011-03-11 CN CN 201120064231 patent/CN202050245U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102946106A (en) * | 2012-11-27 | 2013-02-27 | 常州市宏大电气有限公司 | Silicon controlled rectifier combination switch |
| CN102957157A (en) * | 2012-11-27 | 2013-03-06 | 常州市宏大电气有限公司 | Silicon controlled composite switch of intelligent zero-crossing switching |
| CN103023044A (en) * | 2012-11-27 | 2013-04-03 | 常州市宏大电气有限公司 | Combination switch with intelligent zero-crossing switching function |
| CN102957157B (en) * | 2012-11-27 | 2015-04-08 | 常州市宏大电气有限公司 | Silicon controlled composite switch of intelligent zero-crossing switching |
| CN102946106B (en) * | 2012-11-27 | 2015-04-08 | 常州市宏大电气有限公司 | Silicon controlled rectifier combination switch |
| CN103904660A (en) * | 2014-03-24 | 2014-07-02 | 郑成锋 | Composite contactor |
| CN106877772A (en) * | 2017-01-04 | 2017-06-20 | 李振久 | A kind of three-phase contactless alternating-current switch of alternative A.C. contactor |
| CN106877772B (en) * | 2017-01-04 | 2024-01-05 | 李振久 | Three-phase contactless AC switch capable of replacing AC contactor |
| CN111711202A (en) * | 2020-06-30 | 2020-09-25 | 合肥众甫工业技术有限公司 | Reactive compensation capacitor switching device based on three-phase four-wire system power grid |
| CN112531886A (en) * | 2020-10-26 | 2021-03-19 | 国网内蒙古东部电力有限公司电力科学研究院 | Power distribution station area mobile monitoring platform device, system and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111123 Termination date: 20120311 |