CN109975597A - Residual current detection method, apparatus and intelligent electrical apparatus release - Google Patents
Residual current detection method, apparatus and intelligent electrical apparatus release Download PDFInfo
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- CN109975597A CN109975597A CN201910317532.0A CN201910317532A CN109975597A CN 109975597 A CN109975597 A CN 109975597A CN 201910317532 A CN201910317532 A CN 201910317532A CN 109975597 A CN109975597 A CN 109975597A
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- residual current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses a kind of residual current detection methods.Residual current detection method of the present invention samples residual current signal using residual current transformer, and carries out signal condition to the residual current signal sampled, finally calculates residual current according to signal after conditioning；When carrying out signal condition to the residual current signal sampled, signal condition is carried out respectively to the positive and negative half-wave signa in the residual current signal sampled.The invention also discloses a kind of residual current detection device and a kind of intelligent electrical apparatus releases.The present invention is due to only amplifying half of wave, waveforms amplitude only has the half of entire AC wave shape, operational amplifier circuit can use higher amplification factor, while the zero point of residual current sampled signal is reference with the ground of buckle releaser circuit, does not need to return to zero, the problem of there is no zero point floatings, measurement accuracy is significantly improved, and only needs a power supply, requires hardware circuit low, without rear class A/D module, the cost of intelligent electrical apparatus release can be reduced.
Description
Technical field
The present invention relates to a kind of residual current detection method, apparatus, belong to low voltage electrical apparatus technology field.
Background technique
With the continuous development of low-voltage electrical apparatus, demand of the market to low-voltage circuit breaker is growing day by day.Low-voltage circuit breaker conduct
The important component of low-voltage electrical apparatus is mainly used for overloading distribution system and electrical equipment etc., the various protections such as short circuit,
And intelligent electrical apparatus release is the core detection control unit of breaker.In a power distribution system, residual current protecting function is to prevent people
The effective measures of member's electric shock, are also possible to prevent the electrical fire caused by residual current and equipment damage, are widely used in
The various occasions such as family and industry.
Since residual current signal is ac small signal, it is directed to the processing of residual current signal, the side generallyd use at present
Formula is to carry out enhanced processing after lifting level or lift level processing again after directly amplifying to AC signal using positive-negative power.This two
All there is null offset in kind method, the drift of zero point, which will lead to, is superimposed DC component on current signal, influence measurement essence
Degree.The latter one also need in addition to configure negative electricity source chip etc., are handled again amplified AC signal, switch to direct current point
Amount, circuit structure is complicated, higher cost.
Summary of the invention
Practical problem to be solved by this invention is to overcome the shortage of prior art, and it is simple to provide a kind of circuit structure, surveys
Accuracy of measurement height, low-cost residual current detection method, apparatus.
The present invention specifically uses following technical scheme to solve above-mentioned technical problem:
A kind of residual current detection method samples residual current signal using residual current transformer, and to the residue sampled
Current signal carries out signal condition, finally calculates residual current according to signal after conditioning；To the residual current signal sampled
When carrying out signal condition, signal condition is carried out respectively to the positive and negative half-wave signa in the residual current signal sampled.
Preferably, the positive and negative half-wave signa in the residual current signal sampled carries out signal condition respectively, tool
Body includes: using in-phase amplification circuit and see-saw circuit to the positive and negative half-wave signa in the residual current signal sampled
It amplifies respectively.
Further, the positive and negative half-wave signa in the residual current signal sampled carries out signal condition respectively,
Further include: positive and negative half-wave signa amplified to the difference is carried out with phase summation process.
A kind of residual current detection device, comprising: for sampling the residual current transformer of residual current signal, for pair
The residual current signal sampled carries out the residual current signal conditioning circuit of signal condition, for being calculated according to signal after conditioning
The logic circuit of residual current out；The residual current signal conditioning circuit includes positive half-wave conditioning circuit and negative half-wave conditioning electricity
Road is respectively used to carry out signal condition to the positive and negative half-wave signa in the residual current signal sampled.
Preferably, the positive half-wave conditioning circuit is in-phase amplification circuit, for in the residual current signal sampled
Positive half-wave signal amplify；The negative half-wave conditioning circuit is see-saw circuit, for the residual current sampled
Negative half-wave signa in signal amplifies.
It is further preferred that the in-phase amplification circuit is by resistance R1 ~ R3, capacitor C1, C2 and operational amplifier N1A structure
At one end of resistance R1 connects sampled residual current signal, and the other end of resistance R1 connects one end of capacitor C1, fortune simultaneously
The non-inverting input terminal of amplifier N1A, the other end ground connection of capacitor C1 are calculated, the inverting input terminal of operational amplifier N1A connects simultaneously
One end of resistance R2, one end of resistance R3, capacitor C2 one end, the other end of resistance R2 connects jointly with the other end of capacitor C2
The other end on ground, resistance R3 is connect with the output end of operational amplifier N1A；The see-saw circuit is by resistance R4 ~ R6, capacitor
C3, C4 and operational amplifier N1B are constituted, and one end of resistance R4 connects sampled residual current signal, and resistance R4's is another
End at the same connect one end of capacitor C3, one end of resistance R6, operational amplifier N1B inverting input terminal, the other end of capacitor C3
Ground connection, the output end of the other end connection operational amplifier N1B of resistance R6, the non-inverting input terminal of operational amplifier N1B connect simultaneously
One end of connecting resistance R5, capacitor C4 one end, the other end of resistance R5 is grounded jointly with the other end of capacitor C4.
Further, the residual current signal conditioning circuit further includes same phase summing circuit, for putting respectively to described
Positive and negative half-wave signa after big is carried out with phase summation process.
Preferably, the same phase summing circuit is made of resistance R7 ~ R10 and operational amplifier N1C, resistance R7 ~ R10's
Resistance value is equal, and one end of resistance R9, one end of resistance R10 are separately connected the output end of in-phase amplification circuit, reverse amplification circuit
Output end, the other end of resistance R9 connect the non-inverting input terminal of operational amplifier N1C with the other end of resistance R10 jointly, transports
The inverting input terminal for calculating amplifier N1C is connect jointly with one end of one end of resistance R7, resistance R8, another termination of resistance R7
Ground, the output end of the other end connection operational amplifier N1C of resistance R8.
Following technical scheme can also be obtained according to identical invention thinking:
A kind of intelligent electrical apparatus release, including as above residual current detection device described in any technical solution.
It is further preferred that the intelligent electrical apparatus release further includes for providing the test electricity of residual current fault simulating function
Road.
Compared with prior art, technical solution of the present invention has the advantages that
Compared with the signal processing mode amplified again after existing lift level, the present invention is positive and negative to residual current sampled signal
Half-wave carries out signal condition mode respectively, and due to only amplifying to half of wave, waveforms amplitude only has the one of entire AC wave shape
Half, operational amplifier circuit can use higher amplification factor, while the zero point of residual current sampled signal is with the ground of buckle releaser circuit
The problem of for reference, not needing to return to zero, floating there is no zero point, measurement accuracy is significantly improved.
Compared with the signal processing mode that existing amplifier is amplified using positive-negative power, the present invention has circuit structure letter
Single advantage, it is only necessary to a power supply, it is low to hardware circuit requirement, the cost of intelligent electrical apparatus release can be reduced.
Detailed description of the invention
Fig. 1 is the circuit block diagram of one preferred embodiment of intelligent electrical apparatus release of the present invention；
Fig. 2 is the circuit diagram of residual current signal conditioning circuit one embodiment；
Fig. 3 is the waveform diagram of residual current sampled signal V0；
Fig. 4 is the waveform diagram of residual current sampled signal V1 after amplification；
Fig. 5 is the waveform diagram of residual current sampled signal V2 after amplification；
Fig. 6 is the circuit diagram of another embodiment of residual current signal conditioning circuit；
Fig. 7 is the waveform diagram of residual current sampled signal V3 after combination.
Specific embodiment
For the deficiency of the processing technique of existing residual current signal, thinking of the invention is to residual current sampled signal
In positive and negative half-wave signa carry out signal condition respectively, due to only being amplified to half of wave, the only entire exchange of waveforms amplitude
The half of waveform, operational amplifier circuit can use higher amplification factor, while the zero point of residual current sampled signal is with buckle releaser
The problem of ground of circuit is reference, does not need to return to zero, and is floated there is no zero point, measurement accuracy is significantly improved, and only needs
A power supply is wanted, it is low to hardware circuit requirement, the cost of intelligent electrical apparatus release can be reduced.
Technical solution of the present invention is described in detail with reference to the accompanying drawing:
Fig. 1 shows the circuit block diagram of one preferred embodiment of intelligent electrical apparatus release of the present invention comprising residual current transformer remains
Aftercurrent sample circuit, residual current signal conditioning circuit, rectification circuit, filter circuit, power circuit, sample circuit, signal
Conditioning circuit, MCU, tripping driving circuit, voltage and break detection circuit, indicating circuit, adjusting circuit, hot memory circuit, report
Alert output, test interface, threephase switch power supply and hookup.
Residual current sampled signal circuit is connect with residual current transformer, and residual current sampled signal collected is sent
MCU is sent into after entering the processing of residual current signal conditioning circuit.Residual current sample circuit is collected by residual current transformer
Residual current signal include positive half-wave and negative half-wave, residual current signal conditioning circuit to residual current sampled signal just half
Wave, negative half-wave carry out signal condition respectively.Residual current signal conditioning circuit of the invention can be used two or more
Operational amplifier carry out signal condition, can be supplied to MCU two independent residual current current signals or one combination
Residual current current signal.
Rectification circuit is connect with current transformer, and power supply provided by current transformer is sent into filter circuit.Filtered electrical
In addition road is also connect with threephase switch power supply, test interface, be sent into power circuit after power supply provided by it is filtered, electricity
Source circuit generation system working power.Current sampling circuit is connected with the rectifying circuit, and generated current sampling signal is sent into
MCU is sent into after signal conditioning circuit processing.Hookup is connect with MCU and residual current transformer, provides residual circuit failure
Analog functuion.Magnetic flow convertor is connected by voltage and break detection circuit and tripping driving circuit with MCU, and tripping electricity is provided
Pressure differentiation, magnetic flux burn out detection function.MCU realizes the tripping of breaker by tripping driving circuit control magnetic flux converter.MCU
Also it is connected respectively with indicating circuit, adjusting circuit, hot memory circuit, alarm output circuit, operating status instruction, tripping is provided
Device parameter tuning, hot memory function and alarm non-tripping function.
Fig. 2 shows one embodiment of wherein residual current signal conditioning circuit, as shown in Fig. 2, it is simultaneously using same
Phase amplifying circuit and see-saw circuit carry out signal come positive and negative half of cycle respectively to residual current sampled signal V0 and put
Greatly, wherein residual current sampled signal V0 waveform is as shown in Figure 3.As shown in Fig. 2, resistance R1, R2, R3, capacitor C1, C2, amplifier
N1A constitutes in-phase amplification circuit, amplifies to obtain residual current signal V1 to the positive half-wave of residual current sampled signal V0,
Magnification ratio coefficient is (1+R3/R2), and amplified residual current signal V1 waveform is as shown in figure 4, wherein resistance R1 is balance
Resistance, capacitor C1, C2 play decoupling.Similarly, resistance R4, R5, R6, the see-saw circuit that amplifier N1B is constituted is to residue
The negative half-wave of current sampling signal V0 is reversely amplified, and positive residual current signal V2 is obtained, and magnification ratio coefficient is
(- R6/R4), as shown in figure 5, wherein resistance R5 is balance resistance, capacitor C3, C4 rise amplified residual current signal V2 waveform
Decoupling effect.Amplified signal V1, V2 obtained can be sent directly into MCU and carry out calculation processing, and residual current can be obtained
Exact numerical.
MCU carries out n times AD sampling to signal V1, V2 in sampling period T, and successively obtaining V1 sampled value is a1, a2 ...
An, V2 sampled value are b1, b2 ... bn, take c1=a1+b1, c2=a2+b2 ... cn=an+bn, and calculate data c1, c2 ... cn exists
The root-mean-square value C of cycle T, chooses suitable resistance value, keeps magnification ratio coefficient (1+R3/R2), (R6/R4) equal, then C multiplied by
The obtained value of one determining COEFFICIENT K is the virtual value of signal V0, COEFFICIENT K pass proportional to above-mentioned magnification ratio coefficient
System.For the residual current protecting function of having instantaneous demand, queue processing can be carried out to the data of sampling to have reduced
Valid value calculates the time needed, and queue length n, i.e., when (n+1)th AD is sampled, V1 sampled value is an+1, V2 sampled value is bn+1,
Take cn+1= an+1+ bn+1, calculate data c2, c3 ... cn+1Root-mean-square value as new root-mean-square value C, K*C be having for V0
Valid value, the n-th+2 times and AD sampling processing method is identical later, this will not be detailed here.MCU is by the numerical value of V0 compared with given threshold
After carry out corresponding residual current protecting.
In order to be further reduced MCU pin number, simplify programmed algorithm, use can also be increased on the basis of Fig. 2 circuit
In carrying out the same phase summing circuit with phase summation process to the amplified positive and negative half-wave signa of the difference, Fig. 6 shows this
One, sample the same as phase summing circuit.As shown in fig. 6, amplified signal V1, V2 is again by by resistance R7, R8, R9, R10 and amplifier N1C
Composed same phase summing circuit carries out same Xiang Qiuhe, and the residual current signal V3 of an available combination is sent into MCU and is counted
Calculation processing, is arranged parameter R7=R8=R9=R10, then V3=R8*(V1/R9+V2/R10), the waveform of signal V3 is as shown in Figure 7.This
Sample, MCU only need the combination signal V3 for receiving V1 and V2 using an I/O pin that can calculate accurate residual current, and
Corresponding residual current protecting is carried out according to the testing result of residual current.
Claims (10)
1. a kind of residual current detection method samples residual current signal using residual current transformer, and surplus to what is sampled
Aftercurrent signal carries out signal condition, finally calculates residual current according to signal after conditioning；It is characterized in that, to being sampled
When residual current signal carries out signal condition, letter is carried out respectively to the positive and negative half-wave signa in the residual current signal sampled
Number conditioning.
2. method as described in claim 1, which is characterized in that the positive and negative half-wave in the residual current signal sampled
Signal carries out signal condition respectively, specifically includes: using in-phase amplification circuit and see-saw circuit to the residue electricity sampled
Positive and negative half-wave signa in stream signal amplifies respectively.
3. method as claimed in claim 2, which is characterized in that the positive and negative half-wave in the residual current signal sampled
Signal carries out signal condition respectively, further includes: positive and negative half-wave signa amplified to the difference is carried out with phase summation process.
4. a kind of residual current detection device, comprising: for sampling the residual current transformer of residual current signal, for institute
The residual current signal of sampling carries out the residual current signal conditioning circuit of signal condition, for being calculated according to signal after conditioning
The logic circuit of residual current；It is characterized in that, the residual current signal conditioning circuit includes positive half-wave conditioning circuit and bears
Half-wave conditioning circuit is respectively used to carry out signal condition to the positive and negative half-wave signa in the residual current signal sampled.
5. device as claimed in claim 4, which is characterized in that the positive half-wave conditioning circuit be in-phase amplification circuit, for pair
The positive half-wave signal in residual current signal sampled amplifies；The negative half-wave conditioning circuit is see-saw circuit,
For being amplified to the negative half-wave signa in the residual current signal sampled.
6. device as claimed in claim 5, which is characterized in that the in-phase amplification circuit by resistance R1 ~ R3, capacitor C1, C2 with
And operational amplifier N1A is constituted, one end of resistance R1 connects sampled residual current signal, and the other end of resistance R1 connects simultaneously
One end of capacitor C1, the non-inverting input terminal of operational amplifier N1A are connect, the other end ground connection of capacitor C1, operational amplifier N1A's is anti-
Phase input terminal connect simultaneously one end of resistance R2, one end of resistance R3, capacitor C2 one end, the other end of resistance R2 and capacitor C2
The other end be grounded jointly, the other end of resistance R3 is connect with the output end of operational amplifier N1A；The see-saw circuit by
Resistance R4 ~ R6, capacitor C3, C4 and operational amplifier N1B are constituted, and one end of resistance R4 connects sampled residual current letter
Number, the other end of resistance R4 connect simultaneously one end of capacitor C3, one end of resistance R6, operational amplifier N1B inverting input terminal,
The other end of capacitor C3 is grounded, and the output end of the other end connection operational amplifier N1B of resistance R6, operational amplifier N1B's is same
Phase input terminal connects one end of resistance R5, one end of capacitor C4 simultaneously, and the other end of the other end and capacitor C4 of resistance R5 is common
Ground connection.
7. such as claim 5 or 6 described devices, which is characterized in that the residual current signal conditioning circuit further includes mutually asking together
And circuit, it carries out for positive and negative half-wave signa amplified to the difference with phase summation process.
8. device as claimed in claim 7, which is characterized in that the same phase summing circuit is by resistance R7 ~ R10 and operation amplifier
Device N1C is constituted, and the resistance value of resistance R7 ~ R10 is equal, and one end of resistance R9, one end of resistance R10 are separately connected in-phase amplification circuit
Output end, reverse amplification circuit output end, the other end of resistance R9 connect operation amplifier with the other end of resistance R10 jointly
The non-inverting input terminal of device N1C, inverting input terminal and one end of resistance R7, one end of resistance R8 of operational amplifier N1C connect jointly
It connects, the other end ground connection of resistance R7, the output end of the other end connection operational amplifier N1C of resistance R8.
9. a kind of intelligent electrical apparatus release, which is characterized in that including any one of such as claim 4 ~ 8 residual current detection device.
10. intelligent electrical apparatus release as claimed in claim 9, which is characterized in that further include for providing residual current fault simulation function
The hookup of energy.
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| CN201910317532.0A CN109975597A (en) | 2019-04-19 | 2019-04-19 | Residual current detection method, apparatus and intelligent electrical apparatus release |
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| CN201910317532.0A CN109975597A (en) | 2019-04-19 | 2019-04-19 | Residual current detection method, apparatus and intelligent electrical apparatus release |
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Cited By (5)
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| CN110780250A (en) * | 2019-09-30 | 2020-02-11 | 国创新能源汽车能源与信息创新中心(江苏)有限公司 | Automatic calibration system and method for residual current detection |
| CN112582978A (en) * | 2019-09-30 | 2021-03-30 | 国创新能源汽车能源与信息创新中心(江苏)有限公司 | Leakage protection method and device and charging pile |
| CN113325358A (en) * | 2021-05-07 | 2021-08-31 | 南方电网数字电网研究院有限公司 | Method and system for rapidly detecting residual current of intelligent electric meter |
| CN113552406A (en) * | 2021-07-27 | 2021-10-26 | 上海电机学院 | High-precision residual current detection device powered by single power supply |
| CN114596719A (en) * | 2022-03-21 | 2022-06-07 | 无锡安邦电气股份有限公司 | Signal lamp state real-time monitoring system based on software and hardware double-layer framework |
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| CN114596719A (en) * | 2022-03-21 | 2022-06-07 | 无锡安邦电气股份有限公司 | Signal lamp state real-time monitoring system based on software and hardware double-layer framework |
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