CN103683186B - A kind of residual current circuit breaker with self-setting function - Google Patents
A kind of residual current circuit breaker with self-setting function Download PDFInfo
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- CN103683186B CN103683186B CN201210326015.8A CN201210326015A CN103683186B CN 103683186 B CN103683186 B CN 103683186B CN 201210326015 A CN201210326015 A CN 201210326015A CN 103683186 B CN103683186 B CN 103683186B
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Abstract
The present invention relates to a kind of residual current circuit breaker with self-setting function, comprise power module and the creepage mutual inductor, signal amplification module, control module, controllable silicon and the electrical apparatus release that connect successively, creepage mutual inductor connects three-phase circuit, control module comprises microprocessor, and the EEPROM in this microprocessor preserves the leakage inductance induction signal minimum of a value in compulsory exercise value and previous time period; The leakage inductance induction signal of creepage mutual inductor is after signal amplification module amplifies, be delivered to control module, the leakage inductance induction signal minimum of a value of microprocessor in compulsory exercise value and previous time period is added as new compulsory exercise value, compare with the leakage inductance induction signal of input, if leakage inductance induction signal is greater than new compulsory exercise value, microprocessor output control signal triggers controllable silicon, makes electrical apparatus release action, drives circuit breaker trip. Compared with prior art, the present invention has self-setting function, the error tripping that can avoid intrinsic leakage current to cause.
Description
Technical field
The present invention relates to a kind of breaker, especially relate to a kind of residual current circuit breaker with self-setting function.
Background technology
Residual current circuit breaker (RCCB) is widely used in electric power system, can protect the person, equipmentAnd circuit. But always there is intrinsic leakage current, intrinsic leakage current in user's consumer, circuit selfRelevant with factors such as supply line length, the construction of cable, environment, weathers. The existence of intrinsic leakage current can not be madeForming apparatus circuit and personal accident. But the existence of intrinsic leakage current becomes the protection of RCCBInaccurate, even make a mistake. For example, the residual operating current of certain RCCB is 30mA, as intrinsicLeakage current is 14mA, and so, the leakage current of 16mA occurs device line, and this RCCB just willTripping operation, is not now that real 30mA fault current causes tripping operation, and current tripping operation is a malfunction.All there is above-mentioned defect in the residual current circuit breaker using in the market, not from the merit of adjusting electric leakage working valueEnergy.
Summary of the invention
Object of the present invention is exactly to provide one to have from adjusting in order to overcome the defect that above-mentioned prior art existsThe residual current circuit breaker of function, this breaker in the time judging whether to leak electricity by considering that intrinsic leakage current carries outFrom adjusting, the error tripping of having avoided intrinsic leakage current to cause.
Object of the present invention can be achieved through the following technical solutions:
Have a residual current circuit breaker for self-setting function, this breaker is arranged on three-phase line, comprises electricitySource module and the creepage mutual inductor, signal amplification module, control module, controllable silicon and the electrical apparatus release that connect successively,Described creepage mutual inductor connects three-phase circuit, and described control module comprises microprocessor, and this microprocessor is provided withA/D converter and EEPROM, preserve the electric leakage in compulsory exercise value and previous time period in this EEPROMInduced signal minimum of a value;
When this breaker work, the leakage inductance induction signal of creepage mutual inductor, after signal amplification module amplifies, is delivered toControl module, the microprocessor of control module is by the leakage inductance induction signal minimum in compulsory exercise value and previous time periodValue is added as new compulsory exercise value, compares, if leakage inductance induction signal is large with the leakage inductance induction signal of inputIn new compulsory exercise value, microprocessor output control signal triggers controllable silicon, makes electrical apparatus release action, drivesCircuit breaker trip.
Described signal amplification module comprises the first amplifying unit, the second amplifying unit and the fine setting electricity that connect successivelyResistance, one end of this semifixed resistor connects the output of the second amplifying unit, other end ground connection, its adjustable side is as defeatedGo out to hold link control module, the leakage inductance induction signal of creepage mutual inductor amplifies through the first amplifying unit and second successivelyAfter unit amplifies, then through semifixed resistor, signal is finely tuned then input control module.
The first described amplifying unit comprises the first operational amplifier, the 3rd diode, the 4th diode, the first electricityResistance, the second resistance, the 3rd resistance, the 4th resistance and the 5th resistance, a lead-out terminal ground connection of creepage mutual inductor,Another lead-out terminal connects the inverting input of the first operational amplifier by the second resistance, the first resistance is connected on electric leakageBetween two lead-out terminals of transformer, after described the 3rd diode and the 4th diode reverse parallel connection, be connected onBetween the inverting input and in-phase input end of one operational amplifier, the 3rd described resistance is connected on the first operation amplifierBetween the inverting input and output of device, the 4th described resistance one end ground connection, one of the other end and the 5th resistanceEnd connects, and the other end of the 5th resistance connects power module, and the 4th resistance is connected first with the common port of the 5th resistanceThe in-phase input end of operational amplifier.
The two ends of described signal amplification module are also provided with the anti-interference net of signal end, and the anti-interference net of this signal end comprisesOne electric capacity, the second electric capacity, the 3rd electric capacity and the 3rd inductance, the first described Capacitance parallel connection is at the first resistance two ends,The second described electric capacity is connected with the second resistance, and the 3rd described inductance is connected to adjustable side and the control of semifixed resistorBetween module, the 3rd described electric capacity one end connects the common port of the 3rd inductance and control module, other end ground connection.
The second described amplifying unit comprise the second operational amplifier, the 6th resistance, the 7th resistance, the 8th resistance andThe 9th resistance, the inverting input of the second described operational amplifier connects the first amplifying unit by the 6th resistanceOutput, the 7th described resistance is connected between the inverting input and output of the second operational amplifier, describedOne end of the 8th resistance connects power module, and the other end is connected with one end of the 9th resistance, the other end of the 9th resistanceGround connection, the 8th resistance is connected the in-phase input end of the second operational amplifier with the common port of the 9th resistance.
Described control module also comprises the relay and the LED alarm lamp that are connected with microprocessor, described relayAfter the normally opened contact of device is connected with the tenth resistance, the inverting input and first that is connected on the second operational amplifier amplifies singleBetween the output of unit; When the leakage inductance induction signal detecting when microprocessor exceedes setting value, control relay is ledLogical, make the normally opened contact closure of relay connect the tenth resistance, change the multiplication factor of the second operational amplifier;When leakage inductance induction signal exceed new compulsory exercise value 60%～90% time, microprocessor control LED alarm lamp dodgeBright shinny.
Described power module is accessed by the wherein two-phase of three-phase line, comprises the rectification unit, the power supply that connect successivelyFeed unit and voltage conversion unit, rectification unit carries out after rectification the voltage of input, input power feed unitCarry out step-down, be then converted to applicable voltage through voltage conversion unit.
Described rectification unit comprises two incoming lines, and every incoming line includes access resistance, rectification two utmost pointsPipe and voltage protection device, access resistance one end connects a wherein phase of three-phase line, and the other end connects rectification two utmost pointsThe anode of pipe, the negative electrode of commutation diode connects power supply unit, and described voltage protection device is connected on access electricityResistance and the common port of commutation diode and the neutral conductor of three-phase line.
Described power supply unit comprises N-channel MOS FET device and DC/DC power management chip, instituteThe drain electrode of the N-channel MOS FET device of stating connects rectification unit, and grid connects DC/DC power management chip,After source electrode is connected with DC/DC power management chip as the output of power supply unit.
Described voltage conversion unit comprises the anti-interference network of power end and two voltage transitions chips, and power end is anti-dryDisturb network and comprise the 7th electric capacity, the 6th electric capacity, the 5th electric capacity, inductance coil and the second inductance, the 7th described electricityHold for electrochemical capacitor its anodal output that connects power supply unit, minus earth, described inductance coilTwo input terminals are connected between the positive pole and negative pole of the 7th electric capacity, and two lead-out terminals of inductance coil are by theAfter the filter circuit of six electric capacity, the second inductance and the 5th electric capacity composition, access successively two voltage transitions chips.
Compared with prior art, the present invention has the following advantages:
1, with the function of the new compulsory exercise value of electric leakage of certainly adjusting, avoided non-true leak current fault electric current to causeTripping operation, for different electricity consumption objects, the electric leakage working value of certainly adjusting different, it is meticulousr, more accurate to protect.
2, be provided with alarm prompt facility, in the time that electric leakage exceedes to a certain degree, can time LED alarm lamp flicker shinny,Now discharge current is larger for prompting user, should arouse vigilance.
3,, because the excursion of leakage current is larger, in accuracy of detection circuit, be provided with miniature relay in order to improveDevice, carrys out the multiplication factor of control algorithm amplifier by relay, make it to adapt to the detection of leakage current on a large scale.
4,, in power module, N-channel MOS FET device and DC/DC power management chip have been adopted, differenceIn traditional transformer pressure-reducing or Switching Power Supply, without transformer or inductance, do not need high input voltage electric capacity, yetObtainable 18V DC voltage. This 18V DC voltage obtains 9V through follow-up two voltage transitions chips voltage stabilizingWith 5V voltage, for microprocessor and other devices.
5, be equipped with anti-interference network at signals collecting end and power end, fully ensured anti-the doing in the course of workDisturb ability, this external power access end is provided with voltage protection device, and protection power source is not subject to superpotential damage, canAbsorb surge impact voltage.
Brief description of the drawings
Fig. 1 is the circuit diagram of an embodiment of the present invention;
Fig. 2 is the workflow diagram of control module in the present invention.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment
As shown in Figure 1, a kind of residual current circuit breaker with self-setting function, this breaker is arranged on triple lineLu Shang, comprise power module and the creepage mutual inductor RCT, signal amplification module, control module that connect successively,Controllable silicon SCR and electrical apparatus release TRIP, creepage mutual inductor RCT connects three-phase circuit and gathers leakage inductance induction signal,Signal amplification module comprises the first amplifying unit, the second amplifying unit and the semifixed resistor VR that connect successively.
Wherein the first amplifying unit comprises the first operational amplifier IC1-A, the 3rd diode D3, the 4th diodeD4, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4 and the 5th resistance R 5, leakA lead-out terminal ground connection of electricity transformer RCT, another lead-out terminal connects the first fortune by the second resistance R 2The inverting input of calculating amplifier IC1-A, the first resistance R 1 is connected on two outputs of creepage mutual inductor RCTBetween son, after the 3rd diode D3 and the 4th diode D4 reverse parallel connection, be connected on the first operational amplifier IC1-AInverting input and in-phase input end between, the 3rd resistance R 3 is connected on the anti-phase of the first operational amplifier IC1-ABetween input and output, the 4th resistance R 4 one end ground connection, the other end is connected with one end of the 5th resistance R 5,The other end of the 5th resistance R 5 connects power module, and the 4th resistance R 4 is connected the with the common port of the 5th resistance R 5The in-phase input end of one operational amplifier IC1-A.
After the second amplifying unit is connected in the first amplifying unit, comprise the second operational amplifier IC1-B, the 6th electricityResistance R6, the 7th resistance R 7, the 8th resistance R 8 and the 9th resistance R 9, the second operational amplifier IC1-B's is anti-phaseInput connects the output of the first operational amplifier IC1-A by the 6th resistance R 6, the 7th resistance R 7 is connected onBetween the inverting input and output of the second operational amplifier IC1-B, one end of the 8th resistance R 8 connects power supplyModule, the other end is connected with one end of the 9th resistance R 9, the other end ground connection of the 9th resistance R 9, the 8th resistanceR8 is connected the in-phase input end of the second operational amplifier IC1-B with the common port of the 9th resistance R 9.
One end of semifixed resistor VR connects the output of the second operational amplifier IC1-B, other end ground connection, its tuneJoint end is as output. At input and the output of signal amplification module, be provided with the anti-interference network of signal end,Comprise the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3 and the 3rd inductance L 3, the first capacitor C 1 parallel connectionsAt the first resistance R 1 two ends, the second capacitor C 2 is connected with the second resistance R 2, and the 3rd inductance L 3 is connected to fine settingBetween the adjustable side and control module of resistance VR, the 3rd capacitor C 3 one end connect the 3rd inductance L 3 and control mouldThe common port of piece, other end ground connection.
Control module comprises microprocessor IC2 and relative peripheral circuit, and microprocessor IC2 is provided with A/DConverter and EEPROM, preserve compulsory exercise value and previous time period (in the present embodiment in this EEPROMBe set as before this for 3 times round the clock) in leakage inductance induction signal minimum of a value, in the time judging, by compulsory exercise value and frontLeakage inductance induction signal minimum of a value in one time period is added as new compulsory exercise value, answers with the leakage inductance detectingSignal compares, and has so just played self-setting function, has avoided the impact of intrinsic leakage current for breaker.Peripheral circuit has comprised LED alarm lamp, button AK, relay J, triode T and the 11 resistanceR11, the 12 resistance R the 12, the 13 resistance R the 13, the 14 resistance R the 14, the 15 resistance R 15,Four capacitor C 4 etc., after the normally opened contact J-1 of relay J connects with the tenth resistance R 10, are connected on the second computing and putBetween the large inverting input of device IC1-B and the output of the first operational amplifier IC1-A, when the leakage detectingWhen electric induction signal exceedes this setting value of 500mA, microprocessor IC2 sends high level to triode T,Make triode T conducting, be connected on the relay J adhesive on the emitter stage of triode T, its normal opened contact J-1 connectsLead to the tenth resistance R 10, changed the multiplication factor of the second operational amplifier IC1-B, make it to adapt to electric leakage on a large scaleThe detection of stream. And when leakage inductance induction signal exceed new compulsory exercise value 80% time, microprocessor IC2 is intermittentlySend the flicker of high level control LED alarm lamp shinny, prompting user: now leakage current should arouse vigilance more greatly.Button AK is the switch that breaker is adjusted certainly, and button AK presses rear microprocessor IC2 and is received from the control of adjustingOrder.
Power module is accessed by the wherein two-phase of three-phase line, is accessed mutually, like this in the present embodiment by A phase with CJust ensure to appoint a scarce phase time still can normally work at three phase mains. Whole power module comprises connect successively wholeStream unit, power supply unit and voltage conversion unit.
Two incoming lines of rectification unit include access resistance, commutation diode and voltage protection device. A phaseAccess resistance R A, the second diode D2, A phase voltage protection device YMA, form A phase incoming line, CAccess mutually resistance R C, the first diode D1, C phase voltage protection device YMC, form C phase incoming line.Access resistance one end connects a wherein phase of three-phase line, and the other end connects the anode of commutation diode, rectification two utmost pointsThe negative electrode of pipe connects power supply unit, the common port that voltage protection device is connected on access resistance and commutation diode withThe neutral conductor of three-phase line.
Power supply unit comprises N-channel MOS FET device Q1 and DC/DC power management chip IC5, NThe drain electrode of channel mosfet device Q1 connects rectification unit, and grid connects DC/DC power management chip IC5,After being connected with DC/DC power management chip, source electrode as the output of power supply unit, exports the direct current of 18VVoltage to follow-up voltage dress changes unit.
Voltage conversion unit comprises the anti-interference network of power end and two voltage transitions chip IC 3 and IC4, power endAnti-interference network comprises the 7th capacitor C 7, the 6th capacitor C 6, the 5th capacitor C 5, inductance coil L1 and the second electricitySense L2, the 7th electric capacity is electrochemical capacitor, its anodal output that connects power supply unit, minus earth, electricityTwo input terminals of sense coil L1 are connected between the positive pole and negative pole of the 7th capacitor C 7, inductance coil L1'sAfter the filter circuit that two lead-out terminals consist of the 6th capacitor C 6, the second inductance L 2 and the 5th capacitor C 5, comply withTwo voltage transitions chips of inferior access. Voltage transitions chip IC 3 is exported DC voltage, the voltage transitions chip of 9VThe DC voltage of IC4 output 5V, for for other devices.
When this breaker work, the leakage inductance induction signal of creepage mutual inductor, after signal amplification module amplifies, is delivered toControl module, if leakage inductance induction signal is greater than new compulsory exercise value, microprocessor IC2 output control signal is touchedSend out controllable silicon SCR, make electrical apparatus release TRIP action, drive circuit breaker trip. The Concrete workflow of microprocessorJourney as shown in Figure 2, has comprised following steps;
1) initialize;
2) carry out the sampling of leakage inductance induction signal;
3) A/D conversion;
4) filtering interfering pulse;
5) the value U of calculating leakage inductance induction signalΔ；
6) judge UΔWhether exceed 500mA, if yes, perform step 7); If NO, carry outStep 8);
7) send signal control relay J adhesive;
8) judge UΔWhether be the minimum of a value of leakage inductance induction signal, if yes, perform step 9); If NO,Perform step 10);
9) by UΔAs minimum of a value UminDeposit EEPROM in;
10) judge whether button AK presses, if yes, perform step 11), if NO, execution step13)：
11) by compulsory exercise value U0Minimum of a value U with leakage inductance induction signalmiAddition conduct judges whether tripping operationNew compulsory exercise value U0；
12) by U0Deposit EEPROM in;
13) judge UΔWhether be greater than 0.8U0, if yes, perform step 14), if NO, return to step 2)；
14) sending signal controlling LED warning light glimmers shinny;
15) judge UΔWhether be greater than 0.8U0, if yes, perform step 16, if NO, scope step 2);
16) send signal controlling and trigger controllable silicon SCR, make electrical apparatus release TRIP action, drive circuit breaker trip.
The present invention has from the function of adjusting electric leakage working value, has avoided non-true leak current fault electric current to cause tripping operation,For different electricity consumption objects, the electric leakage working value of certainly adjusting different, it is meticulousr, more accurate to protect.
Claims (9)
1. have a residual current circuit breaker for self-setting function, this breaker is arranged on three-phase line, bagCreepage mutual inductor, signal amplification module, control module, controllable silicon and the dropout of drawing together power module and connecting successivelyDevice, described creepage mutual inductor connects three-phase circuit, it is characterized in that, and described control module comprises microprocessor,This microprocessor is provided with A/D converter and EEPROM, preserves compulsory exercise value and front in this EEPROMLeakage inductance induction signal minimum of a value in one time period;
When this breaker work, the leakage inductance induction signal of creepage mutual inductor, after signal amplification module amplifies, is delivered toControl module, the microprocessor of control module is by the leakage inductance induction signal minimum in compulsory exercise value and previous time periodValue is added as new compulsory exercise value, compares, if leakage inductance induction signal is large with the leakage inductance induction signal of inputIn new compulsory exercise value, microprocessor output control signal triggers controllable silicon, makes electrical apparatus release action, drivesCircuit breaker trip;
Described signal amplification module comprises the first amplifying unit, the second amplifying unit and the fine setting electricity that connect successivelyResistance, one end of this semifixed resistor connects the output of the second amplifying unit, other end ground connection, its adjustable side is as defeatedGo out to hold link control module, the leakage inductance induction signal of creepage mutual inductor amplifies through the first amplifying unit and second successivelyAfter unit amplifies, then through semifixed resistor, signal is finely tuned then input control module.
2. a kind of residual current circuit breaker with self-setting function according to claim 1, its feature existsIn, the first described amplifying unit comprises the first operational amplifier, the 3rd diode, the 4th diode, the first electricityResistance, the second resistance, the 3rd resistance, the 4th resistance and the 5th resistance, a lead-out terminal ground connection of creepage mutual inductor,Another lead-out terminal connects the inverting input of the first operational amplifier by the second resistance, the first resistance is connected on electric leakageBetween two lead-out terminals of transformer, after described the 3rd diode and the 4th diode reverse parallel connection, be connected onBetween the inverting input and in-phase input end of one operational amplifier, the 3rd described resistance is connected on the first operation amplifierBetween the inverting input and output of device, the 4th described resistance one end ground connection, one of the other end and the 5th resistanceEnd connects, and the other end of the 5th resistance connects power module, and the 4th resistance is connected first with the common port of the 5th resistanceThe in-phase input end of operational amplifier.
3. a kind of residual current circuit breaker with self-setting function according to claim 1, its feature existsIn, the two ends of described signal amplification module are also provided with the anti-interference net of signal end, and the anti-interference net of this signal end comprisesOne electric capacity, the second electric capacity, the 3rd electric capacity and the 3rd inductance, the first described Capacitance parallel connection is at the first resistance two ends,The second described electric capacity is connected with the second resistance, and the 3rd described inductance is connected to adjustable side and the control of semifixed resistorBetween module, the 3rd described electric capacity one end connects the common port of the 3rd inductance and control module, other end ground connection.
4. a kind of residual current circuit breaker with self-setting function according to claim 1, its feature existsIn, the second described amplifying unit comprise the second operational amplifier, the 6th resistance, the 7th resistance, the 8th resistance andThe 9th resistance, the inverting input of the second described operational amplifier connects the first amplifying unit by the 6th resistanceOutput, the 7th described resistance is connected between the inverting input and output of the second operational amplifier, describedOne end of the 8th resistance connects power module, and the other end is connected with one end of the 9th resistance, the other end of the 9th resistanceGround connection, the 8th resistance is connected the in-phase input end of the second operational amplifier with the common port of the 9th resistance.
5. a kind of residual current circuit breaker with self-setting function according to claim 4, its feature existsIn, described control module also comprises the relay and the LED alarm lamp that are connected with microprocessor, described relayAfter the normally opened contact of device is connected with the tenth resistance, the inverting input and first that is connected on the second operational amplifier amplifies singleBetween the output of unit; When the leakage inductance induction signal detecting when microprocessor exceedes setting value, control relay is ledLogical, make the normally opened contact closure of relay connect the tenth resistance, change the multiplication factor of the second operational amplifier;When leakage inductance induction signal exceed new compulsory exercise value 60%～90% time, microprocessor control LED alarm lamp dodgeBright shinny.
6. a kind of residual current circuit breaker with self-setting function according to claim 1, its feature existsIn, described power module is accessed by the wherein two-phase of three-phase line, comprises the rectification unit, the power supply that connect successivelyFeed unit and voltage conversion unit, rectification unit carries out after rectification the voltage of input, input power feed unitCarry out step-down, be then converted to applicable voltage through voltage conversion unit.
7. a kind of residual current circuit breaker with self-setting function according to claim 6, its feature existsIn, described rectification unit comprises two incoming lines, every incoming line includes access resistance, rectification two utmost pointsPipe and voltage protection device, access resistance one end connects a wherein phase of three-phase line, and the other end connects rectification two utmost pointsThe anode of pipe, the negative electrode of commutation diode connects power supply unit, and described voltage protection device is connected on access electricityBetween resistance and the common port of commutation diode and the neutral conductor of three-phase line.
8. a kind of residual current circuit breaker with self-setting function according to claim 6, its feature existsIn, described power supply unit comprises N-channel MOS FET device and DC/DC power management chip, instituteThe drain electrode of the N-channel MOS FET device of stating connects rectification unit, and grid connects DC/DC power management chip,After source electrode is connected with DC/DC power management chip as the output of power supply unit.
9. a kind of residual current circuit breaker with self-setting function according to claim 6, its feature existsIn, described voltage conversion unit comprises the anti-interference network of power end and two voltage transitions chips, power end is anti-dryDisturb network and comprise the 7th electric capacity, the 6th electric capacity, the 5th electric capacity, inductance coil and the second inductance, the 7th described electricityHold for electrochemical capacitor its anodal output that connects power supply unit, minus earth, described inductance coilTwo input terminals are connected between the positive pole and negative pole of the 7th electric capacity, and two lead-out terminals of inductance coil are by theAfter the filter circuit of six electric capacity, the second inductance and the 5th electric capacity composition, access successively two voltage transitions chips.
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| CN104993450B (en) * | 2015-07-22 | 2018-08-21 | 济南市市政工程设计研究院（集团）有限责任公司 | A kind of road lighting Aftercurrent protecting equipment and method |
| CN108306256B (en) * | 2018-02-08 | 2019-07-30 | 常熟开关制造有限公司(原常熟开关厂） | Prevent the method and residual current circuit breaker of residual current circuit breaker malfunction |
| CN108711827B (en) * | 2018-04-27 | 2023-11-24 | 天津市百利电气有限公司 | Signal processing device of leakage circuit breaker |
| CN109683014A (en) * | 2019-02-22 | 2019-04-26 | 山东欧德利电气设备有限公司 | A kind of instrument current detection circuit that can directly detect direct current and exchange |
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