CN103683186A - Residual current breaker with self-tuning function - Google Patents
Residual current breaker with self-tuning function Download PDFInfo
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Abstract
The invention relates to a residual current breaker with a self-tuning function. The residual current breaker comprises a power module, as well as a leakage mutual inductor, a signal amplifying module, a control module, a controllable silicon and a tripping device which are connected in series, wherein the leakage mutual inductor is connected with a three-phase circuit; the control module comprises a microprocessor with an EEPROM therein in which a set action value and a minimum value of a leakage induction signal in the last time period are saved; the leakage induction signals of the leakage mutual inductor are amplified by the signal amplifying module, and then sent to the control module; the microprocessor calculates the sum of the set action value and the minimum value of the leakage induction signal in the last time period to serve as a new set action value for comparing with an input leakage induction signal, if the leakage induction signal is larger than the new set action value, the microprocessor outputs a control signal to trigger the controllable silicon, and accordingly the tripping device acts to drive the breaker to trip. Compared with the prior art, the breaker has the self-tuning function, and can avoid false tripping caused by inherent leakage current.
Description
Technical field
The present invention relates to a kind of circuit breaker, especially relate to a kind of residual current circuit breaker with self-setting function.
Background technology
Residual current circuit breaker (residual current circuit breaker) is widely used in electric power system, can protect the person, equipment and circuit.But user's power consumption equipment, circuit self always exist intrinsic leakage current, intrinsic leakage current is relevant with factors such as supply line length, the construction of cable, environment, weathers.The existence of intrinsic leakage current can not cause device line and personal accident.Yet the existence of intrinsic leakage current makes the protection of residual current circuit breaker become inaccurate, even makes a mistake.For example, the residual operating current of certain residual current circuit breaker is 30mA, if intrinsic leakage current is 14mA, so, there is the leakage current of 16mA in device line, and this residual current circuit breaker just will trip, be not now that real 30mA fault current causes tripping operation, 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 function of adjusting electric leakage operating value.
Summary of the invention
Object of the present invention is exactly to provide a kind of residual current circuit breaker with self-setting function in order to overcome the defect of above-mentioned prior art existence, this circuit breaker when judging whether to leak electricity by considering that intrinsic leakage current carries out from 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:
A kind of residual current circuit breaker with self-setting function, this circuit breaker is arranged on three-phase line, comprise power module and the creepage mutual inductor, signal amplification module, control module, controllable silicon and the release that connect successively, described creepage mutual inductor connects three-phase circuit, described control module comprises microprocessor, this microprocessor is provided with A/D converter and EEPROM, preserves the leakage inductance induction signal minimum value in compulsory exercise value and previous time period in this EEPROM;
During this circuit breaker work, 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 value of the microprocessor of control module 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, make release action, drive circuit breaker trip.
Described signal amplification module comprises the first amplifying unit, the second amplifying unit and the semifixed resistor connecting successively, one end of this semifixed resistor connects the output of the second amplifying unit, other end ground connection, its adjustable side is as output link control module, the leakage inductance induction signal of creepage mutual inductor is successively after the first amplifying unit and the amplification of the second amplifying unit, through semifixed resistor, signal is finely tuned again, then input control module.
The first described amplifying unit comprises the first operational amplifier, the 3rd diode, the 4th diode, the first resistance, 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 between two lead-out terminals of creepage mutual inductor, after described the 3rd diode and the 4th diode reverse parallel connection, be connected between the inverting input and in-phase input end of the first operational amplifier, the 3rd described resistance is connected between the inverting input and output of the first operational amplifier, the 4th described resistance one end ground connection, the other end is connected with one end of the 5th resistance, the other end of the 5th resistance connects power module, the 4th resistance is connected the in-phase input end of the first operational amplifier with the common port of the 5th resistance.
The two ends of described signal amplification module are also provided with the anti-interference net of signal end, the anti-interference net of this signal end comprises the first 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, the 3rd described inductance is connected between the adjustable side and control module of semifixed resistor, 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 comprises the second operational amplifier, the 6th resistance, the 7th resistance, the 8th resistance and the 9th resistance, the inverting input of the second described operational amplifier connects the output of the first amplifying unit by the 6th resistance, the 7th described resistance is connected between the inverting input and output of the second operational amplifier, one end of the 8th described resistance connects power module, the other end is connected with one end of the 9th resistance, the other end ground connection of the 9th resistance, 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 relay and the LED alarm lamp being connected with microprocessor, after the normally opened contact of described relay is connected with the tenth resistance, is connected between the inverting input of the second operational amplifier and the output of the first amplifying unit; When the leakage inductance induction signal detecting when microprocessor surpasses set point, control relay conducting, makes closed the tenth resistance of connecting of normally opened contact of relay, changes the multiplication factor of the second operational amplifier; When leakage inductance induction signal surpass new compulsory exercise value 60%～90% time, it is shinny that microprocessor is controlled the flicker of LED alarm lamp.
Described power module is accessed by the wherein two-phase of three-phase line, comprise the rectification unit, power supply unit and the voltage conversion unit that connect successively, rectification unit carries out after rectification the voltage of input, input power feed unit carries out step-down, then through voltage conversion unit, is converted to applicable voltage.
Described rectification unit comprises two incoming lines; every incoming line includes access resistance, rectifier diode and voltage protection device; access resistance one end connects a wherein phase of three-phase line; the other end connects the anode of rectifier diode; the negative electrode of rectifier diode connects power supply unit, and described voltage protection device is connected on access resistance and the common port of rectifier diode and the neutral line of three-phase line.
Described power supply unit comprises N-channel MOS FET device and DC/DC power management chip, the drain electrode of described N-channel MOS FET device connects rectification unit, 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, the anti-interference network of power end comprises the 7th electric capacity, the 6th electric capacity, the 5th electric capacity, inductance coil and the second inductance, the 7th described electric capacity is electrochemical capacitor, its anodal output that connects power supply unit, minus earth, two input terminals of described inductance coil are connected between the positive pole and negative pole of the 7th electric capacity, two lead-out terminals of inductance coil are by the 6th electric capacity, after the filter circuit that the second inductance and the 5th electric capacity form, 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 cause tripping operation, for different electricity consumption objects, the electric leakage operating value of certainly adjusting different, it is meticulousr, more accurate to protect.
2, be provided with alarm prompt facility, when electric leakage surpasses 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 order to improve in accuracy of detection circuit, be provided with midget relay, by relay, carry out the multiplication factor of control algorithm amplifier, make it to adapt to the detection of leakage current on a large scale.
4, in power module, adopt N-channel MOS FET device and DC/DC power management chip, be different from traditional transformer pressure-reducing or Switching Power Supply, without transformer or inductance, also do not needed high input voltage electric capacity, i.e. obtainable 18V direct voltage.This 18V direct voltage obtains 9V and 5V voltage through follow-up two voltage transitions chips voltage stabilizing, for microprocessor and other devices.
5, at signals collecting end and power end, be equipped with anti-interference network, fully guaranteed the antijamming capability in the course of work, this external power access end is provided with voltage protection device, and protection power source is not subject to superpotential damage, can absorb surge impact voltage.
Accompanying drawing explanation
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.
Embodiment
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 circuit breaker is arranged on three-phase line, comprise power module and the creepage mutual inductor RCT, signal amplification module, control module, controllable silicon SCR and the release TRIP that connect successively, creepage mutual inductor RCT connects three-phase circuit and gathers leakage inductance induction signal, and signal amplification module comprises the first amplifying unit, the second amplifying unit and the semifixed resistor VR connecting successively.
Wherein the first amplifying unit comprises the first operational amplifier IC1-A, the 3rd diode D3, the 4th diode D4, 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, a lead-out terminal ground connection of creepage mutual inductor RCT, another lead-out terminal connects the inverting input of the first operational amplifier IC1-A by the second resistance R 2, the first resistance R 1 is connected between two lead-out terminals of creepage mutual inductor RCT, after the 3rd diode D3 and the 4th diode D4 reverse parallel connection, be connected between the inverting input and in-phase input end of the first operational amplifier IC1-A, the 3rd resistance R 3 is connected between the inverting input and output of the first operational amplifier IC1-A, 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, the 4th resistance R 4 is connected the in-phase input end of the first operational amplifier IC1-A with the common port of the 5th resistance R 5.
After the second amplifying unit is connected in the first amplifying unit, comprise the second operational amplifier IC1-B, the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8 and the 9th resistance R 9, the inverting input of the second operational amplifier IC1-B connects the output of the first operational amplifier IC1-A by the 6th resistance R 6, the 7th resistance R 7 is connected between the inverting input and output of the second operational amplifier IC1-B, one end of the 8th resistance R 8 connects power module, 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 resistance R 8 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, and its adjustable side is as output.Input and output at 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 is connected in parallel on the first resistance R 1 two ends, the second capacitor C 2 is connected with the second resistance R 2, the 3rd inductance L 3 is connected between the adjustable side and control module of semifixed resistor VR, and the 3rd capacitor C 3 one end connect the common port of the 3rd inductance L 3 and control module, other end ground connection.
Control module comprises microprocessor IC2 and relative peripheral circuit, microprocessor IC2 is provided with A/D converter and EEPROM, in this EEPROM, preserve the leakage inductance induction signal minimum value in compulsory exercise value and previous time period (be set as in the present embodiment before this 3 round the clock time), when judgement, leakage inductance induction signal minimum value in compulsory exercise value and previous time period is added as new compulsory exercise value, compare with the leakage inductance induction signal detecting, so just play self-setting function, avoided intrinsic leakage current for the impact of circuit breaker.Peripheral circuit has comprised LED alarm lamp, button AK, relay J, triode T and the 11 resistance R 11, the 12 resistance R 12, the 13 resistance R 13, the 14 resistance R 14, the 15 resistance R 15, the 4th capacitor C 4 etc., after the normally opened contact J-1 of relay J connects with the tenth resistance R 10, be connected between the inverting input of the second operational amplifier IC1-B and the output of the first operational amplifier IC1-A, when the leakage inductance induction signal detecting surpasses this set point of 500mA, microprocessor IC2 sends high level to triode T, make triode T conducting, be connected on the relay J adhesive on the emitter of triode T, its normal opened contact J-1 connects the tenth resistance R 10, changed the multiplication factor of the second operational amplifier IC1-B, make it to adapt to the detection of leakage current on a large scale.And when leakage inductance induction signal surpass new compulsory exercise value 80% time, microprocessor IC2 intermittently sends high level, and to control the flicker of LED alarm lamp shinny, prompting user: now leakage current should arouse vigilance more greatly.Button AK is the switch that circuit breaker is adjusted certainly, and button AK presses rear microprocessor IC2 and is received from the control command of adjusting.
Power module is accessed by the wherein two-phase of three-phase line, in the present embodiment, by A phase, is accessed mutually with C, has so just guaranteed to appoint a scarce phase time still can normally work at three phase mains.Whole power module comprises rectification unit, power supply unit and the voltage conversion unit connecting successively.
Two incoming lines of rectification unit include access resistance, rectifier diode and voltage protection device.A accesses resistance R A, the second diode D2, A phase voltage protection device YMA mutually, forms A phase incoming line, and C accesses resistance R C, the first diode D1, C phase voltage protection device YMC mutually, forms C phase incoming line.Access resistance one end connects a wherein phase of three-phase line, and the other end connects the anode of rectifier diode, and the negative electrode of rectifier diode connects power supply unit, and voltage protection device is connected on access resistance and the common port of rectifier diode and the neutral line of three-phase line.
Power supply unit comprises N-channel MOS FET device Q1 and DC/DC power management chip IC5, the drain electrode of N-channel MOS FET device Q1 connects rectification unit, grid connects DC/DC power management chip IC5, after source electrode is connected with DC/DC power management chip, as the output of power supply unit, the direct voltage of output 18V 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, the anti-interference network of power end comprises the 7th capacitor C 7, the 6th capacitor C 6, the 5th capacitor C 5, inductance coil L1 and the second inductance L 2, the 7th electric capacity is electrochemical capacitor, its anodal output that connects power supply unit, minus earth, two input terminals of inductance coil L1 are connected between the positive pole and negative pole of the 7th capacitor C 7, two lead-out terminals of inductance coil L1 are by the 6th capacitor C 6, after the filter circuit that the second inductance L 2 and the 5th capacitor C 5 form, access successively two voltage transitions chips.The direct voltage of the direct voltage of voltage transitions chip IC 3 output 9V, voltage transitions chip IC 4 output 5V, for for other devices.
During this circuit breaker work, the leakage inductance induction signal of creepage mutual inductor is after signal amplification module amplifies, be delivered to control module, if leakage inductance induction signal is greater than new compulsory exercise value, microprocessor IC2 output control signal triggers controllable silicon SCR, make release TRIP action, drive circuit breaker trip.The specific works flow process of microprocessor as shown in Figure 2, has comprised following steps;
1) initialization;
2) carry out the sampling of leakage inductance induction signal;
3) A/D conversion;
4) filtering interfering pulse;
5) calculate the value U of leakage inductance induction signal
Δ;
6) judgement U
Δwhether surpass 500mA, if yes, perform step 7); If NO, perform step 8);
7) send signal control relay J adhesive;
8) judgement U
Δwhether be the minimum value of leakage inductance induction signal, if yes, perform step 9); If NO, perform step 10);
9) by U
Δas minimum value U
mindeposit EEPROM in;
10) judge whether button AK presses, if yes, perform step 11), if NO, perform step 13):
11) by compulsory exercise value U
0minimum value U with leakage inductance induction signal
mibe added as the new compulsory exercise value U that judges whether tripping operation
0;
12) by U
0deposit EEPROM in;
13) judgement U
Δwhether be greater than 0.8U
0, if yes, perform step 14), if NO, return to step 2);
14) sending signal controlling LED warning light glimmers shinny;
15) judgement U
Δwhether be greater than 0.8U
0, if yes, perform step 16, if NO, scope step 2);
16) send signal controlling and trigger controllable silicon SCR, make release TRIP action, drive circuit breaker trip.
The present invention has from the function of adjusting electric leakage operating value, has avoided non-true leak current fault electric current to cause tripping operation, for different electricity consumption objects, and the electric leakage operating value of certainly adjusting different, it is meticulousr, more accurate to protect.
Claims (10)
1. a residual current circuit breaker with self-setting function, this circuit breaker is arranged on three-phase line, comprise power module and the creepage mutual inductor, signal amplification module, control module, controllable silicon and the release that connect successively, described creepage mutual inductor connects three-phase circuit, it is characterized in that, described control module comprises microprocessor, this microprocessor is provided with A/D converter and EEPROM, preserves the leakage inductance induction signal minimum value in compulsory exercise value and previous time period in this EEPROM;
During this circuit breaker work, 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 value of the microprocessor of control module 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, make release action, drive circuit breaker trip.
2. a kind of residual current circuit breaker with self-setting function according to claim 1, it is characterized in that, described signal amplification module comprises the first amplifying unit, the second amplifying unit and the semifixed resistor connecting successively, one end of this semifixed resistor connects the output of the second amplifying unit, other end ground connection, its adjustable side is as output link control module, the leakage inductance induction signal of creepage mutual inductor is successively after the first amplifying unit and the amplification of the second amplifying unit, through semifixed resistor, signal is finely tuned again, then input control module.
3. a kind of residual current circuit breaker with self-setting function according to claim 2, it is characterized in that, the first described amplifying unit comprises the first operational amplifier, the 3rd diode, the 4th diode, the first resistance, 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 between two lead-out terminals of creepage mutual inductor, after described the 3rd diode and the 4th diode reverse parallel connection, be connected between the inverting input and in-phase input end of the first operational amplifier, the 3rd described resistance is connected between the inverting input and output of the first operational amplifier, the 4th described resistance one end ground connection, the other end is connected with one end of the 5th resistance, the other end of the 5th resistance connects power module, the 4th resistance is connected the in-phase input end of the first operational amplifier with the common port of the 5th resistance.
4. a kind of residual current circuit breaker with self-setting function according to claim 2, it is characterized in that, the two ends of described signal amplification module are also provided with the anti-interference net of signal end, the anti-interference net of this signal end comprises the first 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, the 3rd described inductance is connected between the adjustable side and control module of semifixed resistor, the 3rd described electric capacity one end connects the common port of the 3rd inductance and control module, other end ground connection.
5. a kind of residual current circuit breaker with self-setting function according to claim 2, it is characterized in that, the second described amplifying unit comprises the second operational amplifier, the 6th resistance, the 7th resistance, the 8th resistance and the 9th resistance, the inverting input of the second described operational amplifier connects the output of the first amplifying unit by the 6th resistance, the 7th described resistance is connected between the inverting input and output of the second operational amplifier, one end of the 8th described resistance connects power module, the other end is connected with one end of the 9th resistance, the other end ground connection of the 9th resistance, the 8th resistance is connected the in-phase input end of the second operational amplifier with the common port of the 9th resistance.
6. a kind of residual current circuit breaker with self-setting function according to claim 5, it is characterized in that, described control module also comprises relay and the LED alarm lamp being connected with microprocessor, after the normally opened contact of described relay is connected with the tenth resistance, be connected between the inverting input of the second operational amplifier and the output of the first amplifying unit; When the leakage inductance induction signal detecting when microprocessor surpasses set point, control relay conducting, makes closed the tenth resistance of connecting of normally opened contact of relay, changes the multiplication factor of the second operational amplifier; When leakage inductance induction signal surpass new compulsory exercise value 60%～90% time, it is shinny that microprocessor is controlled the flicker of LED alarm lamp.
7. a kind of residual current circuit breaker with self-setting function according to claim 1, it is characterized in that, described power module is accessed by the wherein two-phase of three-phase line, comprise the rectification unit, power supply unit and the voltage conversion unit that connect successively, rectification unit carries out after rectification the voltage of input, input power feed unit carries out step-down, then through voltage conversion unit, is converted to applicable voltage.
8. a kind of residual current circuit breaker with self-setting function according to claim 7; it is characterized in that; described rectification unit comprises two incoming lines; every incoming line includes access resistance, rectifier diode and voltage protection device; access resistance one end connects a wherein phase of three-phase line; the other end connects the anode of rectifier diode; the negative electrode of rectifier diode connects power supply unit, and described voltage protection device is connected on access resistance and the common port of rectifier diode and the neutral line of three-phase line.
9. a kind of residual current circuit breaker with self-setting function according to claim 7, it is characterized in that, described power supply unit comprises N-channel MOS FET device and DC/DC power management chip, the drain electrode of described N-channel MOS FET device connects rectification unit, 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.
10. a kind of residual current circuit breaker with self-setting function according to claim 7, it is characterized in that, described voltage conversion unit comprises the anti-interference network of power end and two voltage transitions chips, the anti-interference network of power end comprises the 7th electric capacity, the 6th electric capacity, the 5th electric capacity, inductance coil and the second inductance, the 7th described electric capacity is electrochemical capacitor, its anodal output that connects power supply unit, minus earth, two input terminals of described inductance coil are connected between the positive pole and negative pole of the 7th electric capacity, two lead-out terminals of inductance coil are by the 6th electric capacity, after the filter circuit that the second inductance and the 5th electric capacity form, access successively two voltage transitions chips.
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Cited By (5)
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| CN104993450A (en) * | 2015-07-22 | 2015-10-21 | 济南市市政工程设计研究院（集团）有限责任公司 | Residual current protection device and residual current protection method for road lighting |
| CN108306256A (en) * | 2018-02-08 | 2018-07-20 | 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 |
| CN108711827A (en) * | 2018-04-27 | 2018-10-26 | 天津市百利电气有限公司 | Leakage circuit breakers signal processing apparatus |
| 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 |
| CN114069555A (en) * | 2020-08-03 | 2022-02-18 | 广东顺德锐铂汇电子科技有限公司 | Three-phase power failure and leakage tripping switch |
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| CN114069555A (en) * | 2020-08-03 | 2022-02-18 | 广东顺德锐铂汇电子科技有限公司 | Three-phase power failure and leakage tripping switch |
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| CN103683186B (en) | 2016-05-18 |
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