CN104034940B - Residual voltage detecting system and method thereof in high precision - Google Patents
Residual voltage detecting system and method thereof in high precision Download PDFInfo
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Abstract
The open a kind of high accuracy residual voltage detecting system of the present invention and method thereof.System includes the 1st solid-state relay SSR1, the 2nd solid-state relay SSR2, the 3rd solid-state relay SSR3, electrical network crest voltage detector unit, residual voltage signal condition unit, main control unit.Electrical network crest voltage detector unit provides electrical network peak value interrupt signal, and crest voltage Direct Inspection Technology contributes to reducing the complexity of residual voltage detecting system, the precision being favorably improved detection and concordance；Electromagnetic relay upgrades to solid-state relay, and the time precision that circuit state is cut is promoted to μ s from ms；When main control unit replaces existing power-off by " immediately accessing " technology acquisition process residual voltage data, the method for access testing system, is favorably improved precision and the concordance of detection；Absolute value circuit carries out reversal to input voltage, and the residual voltage polarity of residual voltage detecting system device under test is insensitive, improves ease for use and the reliability of system.
Description
Technical field
The invention belongs to the technology category of residual voltage detecting system, particularly relate to high accuracy residual voltage detecting system and
Method.
Background technology
Along with science and technology and growth in the living standard, electrical equipment miscellaneous oneself infiltrate into the Fang Fang of productive life
Face, face.After power down, electric energy temporary in circuit energy-storage travelling wave tube during electrical equipment work, so-called " residual voltage ", have one
The individual process the most gradually decayed；During electrical equipment design, if inconsiderate to residual voltage problem, it will cause residue electricity
Pressure can not drop to safety range at short notice；Once operator, maintainer touch the circuit of electrical equipment, easily produce
Electric shock event.The definition of residual voltage (residual voltage) is: after electrical equipment power-off, each interpolar of attaching plug, use
On electricity device interior energy storage device, the residual voltage kept within a period of time.
Electrical equipment has to comply with electromagnetic compatibility respective standard requirement, and engineers and technicians pay close attention to the electromagnetism of product and hold concurrently
Capacitive and the anti-interference index of electromagnetism, conventional technological means is to arrange X electric capacity, Y capacitance or electromagnetic interface filter.The most electrically set
In Bei for wide variety of Switching Power Supply: electrical network is done from the interference of electrical network and the switching pulse of equipment for suppression
Disturbing, Switching Power Supply mostly concatenates low pass EMI(electromagnetic interference in exchange (AC) input side circuit) power-supply filter, and in parallel
Filter capacitor；Wave filter is possible not only to the interference that electrical network is caused by the equipment that effectively filters out, and can cut off the electricity in electrical network
Magnetic disturbance is to the propagation path of equipment, thus plays the effect of two-way isolation.But a large amount of uses of this type of energy-storage travelling wave tube, on the one hand
Bring help to the Electro Magnetic Compatibility of electrical equipment, on the other hand increase again the technical difficulty that residual voltage effectively discharges.
Electrical equipment should reach Electro Magnetic Compatibility index, the requirement of safety criterion to be met；To this end, the safety of all kinds of electrical equipments
Standard increasingly payes attention to the release And Spread of Solute of residual voltage.
Nearly two during the last ten years, and International Electrotechnical Commission (IEC) gives lasting pass to protection against electric shock measure and detection technique
Note；The nineties in 20th century has revised a collection of standard relevant with protection against electric shock and technical report in succession.China or totally introduce or
Adopt by reference IEC standard, and constitute the basic standard system of China's protection against electric shock: GB5226.1-2002 " machine security mechanical electric
Gas equipment part 1: general technical specifications ", GB 9706.1-2007 " medical electrical equipment part 1: safety general require ",
The safety of GB4943-2001 Information Technology Equipment ", GB8898-2001 " audio frequency, video and similar electronic equipments safety require ",
GB4793.1-2007 " measure, control and the safety requirements part 1 of use for laboratory electrical equipment: General Requirement ", standard
GB4706.1-2005 " domestic and the safe part 1 of similar applications electrical equipment: safety requirements ", GB7000.1-2007 " light fixture
1 part: general requirement and test ".Although the service occupation of above-mentioned seven point plan is different, statement term is different, but residual voltage
Cleaning Principle and technology be but identical.In view of the terseness stated the most without loss of generality, standard it is only facing herein
The technical specification of GB4706.1-2005 and term launch to discuss: utensil is powered with rated voltage, and then by it, any one is opened
Pass is placed in " off " position, and utensil disconnects from power supply when voltage peak.During 1s upon opening, will not be to measured value with one
Producing the instrument significantly affected, measure the voltage between each pin of plug, this voltage is not to be exceeded 34V.
Residual voltage has two kinds of detection methods: memory oscilloscope method and special inspecting equipment method.Memory oscilloscope method is at electricity
During gas device powers down one second, with between memory oscilloscope test foot or foot voltage over the ground in addition store-memory, then from screen
The value of residual voltage is read on curtain；Shortcoming is that test man's Artificial Control pulls off the time, judges peak value power-cut time, from oscillograph screen
Reading data on Mu, anthropic factor is many, bad timing is true, measurement error is big, detection efficiency is low.Special inspecting equipment method automatization
Degree is high；Shortcoming is that the concordance of detection data dispatches a person to anticipate, and extensively by the accuracy of detection that dirt is sick；Special inspecting equipment method generation
The developing direction that residual voltage detection technique is following by table.It is little that residual voltage signal presents energy, and the time is short, instantaneous voltage form
Feature；The technological rationality of existing residual voltage detecting system and effectiveness Shortcomings, not enough source by with ask accordingly
Solution approach is analyzed as follows one by one:
Standard GB4706.1-2005 regulation " disconnects from power supply when voltage peak ".In view of crest voltage detection exists skill
Art difficulty, uses zero-detection circuit+chronotron (such as 1/4 cycle 5ms of 50Hz power supply) indirectly to solve scheme mostly；Because of supporting
Electromagnetic relay response time in terms of ms, i.e. chronotron and electromagnetic relay is in same time dimension, therefore electromagnetic relay
The time precision cut off the electricity supply is inadequate, affects precision and the concordance of residual voltage detection.Research and develop simple voltage peak direct
Detection technique, not only facilitates the complexity of reduction residual voltage detecting system and is favorably improved residual voltage detection
Precision and concordance.
Standard GB4706.1-2005 specifies " during 1s upon opening, to produce measured value with one and to significantly affect
Instrument, measures the voltage between each pin of plug ".Noting, the marrow of standard is " will not produce measured value and significantly affect "！
The research work that " measured value will not be produced the instrument significantly affected " focuses on single direction--improve the input of detecting system
Impedance, i.e. reduces detecting system and shunts the decay of electrical equipment residual voltage；Consider from the visual angle of system engineering and owe comprehensively.Cause
Decay for electrical equipment residual voltage depends not only on the timeconstantτ (proper time of electrical equipment residual voltage circuit to be measured
Between constant, τ1, the timeconstantτ of electrical equipment residual voltage circuit after access testing system2), also closely bound up with discharge time；
And research work be confined to access testing system completely after, affect the time constant of electrical equipment residual voltage circuit less
τ1.Existing detection method is: accessing residual voltage detecting system while power-off, time delay 1s gathers residual voltage；Detection system
System reaches 1s to the decay shunting time of electrical equipment residual voltage, it is clear that detection method is owed rationally: now, the residue electricity of collection
Pressure value the most more or less deviates non-access testing system, the residual voltage of electrical equipment after power-off.Imagination: be aided with μ s response time
Solid-state relay (SSR)；" while power-off, access residual voltage detecting system " to make into: during power-off, after time delay 995ms, make SSR
Conducting (access of residual voltage detecting system), it then follows GB4706.1-2005 requires to continue time delay 5ms, start adopting of residual voltage
Collection process；This cut-in method of residual voltage detecting system might as well name " immediately accessing ".It is seen that, this example detects
The decay shunting time of electrical equipment residual voltage is down to 5ms from 1000 ms by system, and instant access technology preferably embodies
The spirit of " measured value will not be produced the instrument significantly affected " that GB4706.1-2005 requires, instant access technology contributes to
Improve precision and the concordance of residual voltage detection.
Up to now, the intellectual property achievement about residual voltage detecting system is very few, more representational relevant knowledge
Property right Summary on research results is as follows:
Patent of invention " the residual voltage measuring method of detection electric appliance load characteristic automatically " (application number
201210359320.7), propose between electric appliance load and power supply, design a measurement apparatus, when electric appliance load works, pass through
Measure corresponding electrical quantity, extrapolate the load characteristic of electrical equipment, after the reckoning of voltage, current phase is calculated deenergization
Phase value during corresponding discharge voltage value maximum after delay, thus at this phase place after power-off, measure magnitude of voltage on request.
Patent of invention " a kind of residual voltage Signal sampling and processing method and system " (application number 201310446821.3),
Propose a kind of residual voltage and gather data processing method and the system of signal, i.e. utilize method of least square to realize exponential curve and intend
Close, the ordered pair observed is modeled, thus realize the optimization to data.
Above-mentioned benefit our pursuits, it is proposed that measure residual voltage, and the post processing side to measurement data according to load characteristic
Method, has certain reference value, but explores achievement and still suffer from limitation；Therefore, it is necessary to base oneself upon existing residual voltage detecting system
And method, on the basis of existing achievement in research, make in-depth study and innovation, lacking for main flow residual voltage detecting system
Fall into and make improvements: abandon the electrical network crest voltage indirect detection technology of zero-detection circuit+chronotron, develop simple electrical network peak
Threshold voltage Direct Inspection Technology；Electromagnetic relay upgrades to solid-state relay (SSR), and the time precision that circuit state is cut is from ms
It is promoted to μ s；From the overall visual angle of system engineering, consider residual voltage detecting system " will not to measured value produce significantly affect "
Requirement, break through and stick to the traditional idea of timeconstantτ, expand towards compression direction discharge time.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, it is provided that a kind of high accuracy residual voltage detecting system and side thereof
Method.
Residual voltage detecting system includes the 1st solid-state relay SSR1, the 2nd solid-state relay SSR2, the 3rd solid-state in high precision
Relay SSR3, electrical network crest voltage detector unit, residual voltage signal condition unit, main control unit；
The input of electrical network and the 1st solid-state relay SSR1, the 2nd solid-state relay SSR2 is connected, the 2nd solid-state relay
The outfan of SSR2 is connected with main control unit through electrical network crest voltage detector unit, the outfan of the 1st solid-state relay SSR1 with
Electrical equipment to be measured, the input of the 3rd solid-state relay SSR3 are connected, and the outfan of the 3rd solid-state relay SSR3 is through residue electricity
Pressure signal condition unit is connected with main control unit, and main control unit is connected with host computer PC；Main control unit issues according to host computer PC
Detection parameter, control residual voltage detecting system, acquisition process residual voltage detection data.
Described electrical network crest voltage detector unit includes dividing potential drop and follow circuit, high pass holds resistance circuit, zero point detects electricity
Road；Dividing potential drop and follow circuit include divider resistance R211、 R212, amplifier LM124；High pass is held resistance circuit and is included electric capacity C22, resistance
R22；Zero-detection circuit includes 2 photoelectrical coupler PC817, phase inverter 74HC04 and resistance R23；
Divider resistance R211And R212Electrical network, divider resistance R are accessed in series connection, two ends211And R212Common port and amplifier
The in-phase input end foot 3 of LM124 is connected, and the inverting input foot 2 of amplifier LM124 is connected with the outfan foot 1 of amplifier LM124 structure
Become voltage follower；Amplifier LM124 outfan foot 1 and electric capacity C22Connected, electric capacity C22The other end be divided into two-way: the first via with
Resistance R22Ground connection after being connected, the second tunnel is connected with 2 photoelectrical coupler PC817 of input reverse parallel connection；Photoelectrical coupler
The collector output of PC817 is in parallel and is connected with the input of phase inverter, and the emitter stage outfan of photoelectrical coupler also couples
Ground, resistance R23One end be connected with the collector output of photoelectrical coupler, resistance R23Another termination VCC；Phase inverter defeated
Go out interrupt request singal INT as electrical network crest voltage.
Described residual voltage signal condition unit includes dividing potential drop and follow circuit, absolute value circuit；
The dividing potential drop of dividing potential drop and the composition of follow circuit and function and electrical network crest voltage detector unit and follow circuit phase
With L and the N end of, the input of dividing potential drop and follow circuit and electrical equipment residual voltage to be measured or L and E end or N and E end phase
Even, the output end voltage U of dividing potential drop and follow circuitinIt is the residual voltage conditioned signal after dividing potential drop, output end voltage UinInput is extremely
Absolute value circuit；
Absolute value circuit includes the 1st amplifier A1 , the 2nd amplifier A2, diode D31、D32, resistance R31、R32、R33、R34And R35；
Resistance R31、R32, diode D31Negative electrode, the 1st amplifier A1Inverting input foot the 2 and the 2nd amplifier A2In-phase input end foot 3 phase
Even, the 1st amplifier A1In-phase input end foot 3 ground connection；Resistance R31The other end and R33, dividing potential drop and the outfan U of follow circuitin
It is connected, resistance R33The other end and R34、R35, the 2nd amplifier A2Inverting input foot 2 be connected, resistance R35The other end and the 2nd
Amplifier A2Outfan Uout2Foot 1 is connected；Diode D31Anode, diode D32Negative electrode and the 1st amplifier A1Outfan Uout1Foot 1
It is connected, resistance R32And R34The other end and diode D32Anode is connected.
Described main control unit is with MCU Atmega128 as core；The foot PB4 of Atmega128, foot PB5, foot PB6 are respectively
It is connected with the 1st solid-state relay SSR1, the 2nd solid-state relay SSR2, the control end of the 3rd solid-state relay SSR3, electrical network peak value
Electrical network crest voltage interrupt request singal INT of voltage detection unit accesses the foot INT0 of MCU Atmega128, and residual voltage is believed
The output signal U of number conditioning unitout2Access the foot ADC0 of MCU Atmega128；The foot RXD of MCU Atmega128, foot TXD
It is connected with host computer PC.
The flow process of residual voltage detection method includes that residual voltage detection prepares flow process, residual voltage detection stream in high precision
Journey；
Residual voltage detection preparation flow process:
Host computer PC human-computer interaction interface selects the GB of detection foundation, confirms or revise the detection of the GB presented
Parameters default is worth, and inputs entrance normal operating conditions required time t after electrical equipment to be measured powers on0；After detection operator confirms
Generate the detection configuration file of this residual voltage, configuration file download to residual voltage detecting system main control unit and
Host computer PC retains a backup；
Residual voltage testing process:
(1) interruption of electrical network crest voltage is closed；
(2) the 1st solid-state relay SSR1 conductings, the 2nd solid-state relay SSR2 and the 3rd solid-state relay SSR3 cut-off, prolong
Time t0；
(3) the 1st solid-state relay SSR1 conductings, the 2nd solid-state relay SSR2 conducting, the 3rd solid-state relay SSR3 cut-off,
Open electrical network crest voltage to interrupt；
Responsive electricity grid crest voltage interrupt, the 1st solid-state relay SSR1 cut-off, the 2nd solid-state relay SSR2 cut-off, the 3rd
Solid-state relay SSR3 cut-off, closes electrical network crest voltage and interrupts, employing " access immediately " technology collection residual voltage value:
Time delay t11Ms, the 1st solid-state relay SSR1 cut-off, the 2nd solid-state relay SSR2 cut-off, the 3rd solid-state relay
SSR3 turns on,
Time delay t12Ms, gathers residual voltage value, the 1st solid-state relay SSR1 ends, the 2nd solid-state relay SSR2 ends,
3rd solid-state relay SSR3 cut-off；
(4) N=N-1, wherein: N is the detection number of times of residual voltage
N ≠ 0 goes to step (2)；
(5) residual voltage detection data packaging file is uploaded to host computer PC, terminates.
The present invention, compared with background technology, has the beneficial effect that
Electrical network crest voltage Direct Inspection Technology replaces the electrical network crest voltage indirect detection of zero-detection circuit+chronotron
Technology, not only facilitates the complexity of reduction residual voltage detecting system and is favorably improved the precision of residual voltage detection
And concordance；Electromagnetic relay upgrades to solid-state relay (SSR), and the time precision that circuit state is cut is promoted to μ s from ms；
" immediately access " method accessing residual voltage detecting system when replacing existing electrical equipment power-off, preferably embody
The spirit of " measured value will not be produced the instrument significantly affected " that GB4706.1-2005 requires, is favorably improved residual voltage
The precision of detection and concordance；Absolute value circuit carries out reversal to input voltage, and residual voltage detecting system is to electricity to be measured
The residual voltage polarity of gas equipment is insensitive, improves ease for use and the reliability of system.
Accompanying drawing explanation
Fig. 1 is the block diagram of high accuracy residual voltage detecting system；
Fig. 2 is the circuit diagram of electrical network crest voltage detector unit；
Fig. 3 is the circuit diagram of residual voltage signal condition unit；
Fig. 4 is the theory diagram of main control unit；
Fig. 5 is the flow chart of high accuracy residual voltage detection method.
Detailed description of the invention
As it is shown in figure 1, high accuracy residual voltage detecting system include the 1st solid-state relay SSR1(1), the 2nd solid-state relay
Device SSR2(2), the 3rd solid-state relay SSR3(3), electrical network crest voltage detector unit 20, residual voltage signal condition unit 30,
Main control unit 40；
Electrical network 4 is connected with the 1st solid-state relay SSR1, the input of the 2nd solid-state relay SSR2, the 2nd solid-state relay
The outfan of SSR2 is connected with main control unit 40 through electrical network crest voltage detector unit 20, the output of the 1st solid-state relay SSR1
End is connected with the input of electrical equipment the 5, the 3rd solid-state relay SSR3 to be measured, and the outfan of the 3rd solid-state relay SSR3 is through surplus
Remaining voltage signal conditioning unit 30 is connected with main control unit 40, and main control unit 40 is connected with host computer PC 6；Main control unit 40
The detection parameter issued according to host computer PC, controls residual voltage detecting system, acquisition process residual voltage detection data.
As in figure 2 it is shown, described electrical network crest voltage detector unit 20 includes dividing potential drop and follow circuit 21, high pass appearance resistance electricity
Road 22, zero-detection circuit 23；Dividing potential drop and follow circuit 21 include divider resistance R211、 R212, amplifier LM124；High pass holds resistance electricity
Road 22 includes electric capacity C22, resistance R22；Zero-detection circuit 23 includes 2 photoelectrical coupler PC817, phase inverter 74HC04 and electricity
Resistance R23；
Divider resistance R211And R212Electrical network 4, divider resistance R are accessed in series connection, two ends211And R212Common port and amplifier
The in-phase input end foot 3 of LM124 is connected, and the inverting input foot 2 of amplifier LM124 is connected with the outfan foot 1 of amplifier LM124 structure
Become voltage follower；Amplifier LM124 outfan foot 1 and electric capacity C22Connected, electric capacity C22The other end be divided into two-way: the first via with
Resistance R22Ground connection after being connected, the second tunnel is connected with 2 photoelectrical coupler PC817 of input reverse parallel connection；Photoelectrical coupler
The collector output of PC817 is in parallel and is connected with the input of phase inverter, and the emitter stage outfan of photoelectrical coupler also couples
Ground, resistance R23One end be connected with the collector output of photoelectrical coupler, resistance R23Another termination VCC；Phase inverter defeated
Go out interrupt request singal INT as electrical network crest voltage.
Amplifier foot 1 output is that the line voltage conditioned signal after dividing potential drop, high pass hold resistance circuit by the electrical network electricity after dividing potential drop
The peak point of pressure conditioned signal becomes zero point, the i.e. detection of electrical network crest voltage and is changed into the zero of high pass appearance resistance circuit output voltage
Point detection；Hold the positive-negative half-cycle of resistance circuit output in high pass, 2 photoelectrical couplers are respectively turned on, voltage is output as low level,
High pass holds the resistance circuit output moment of zero passage, 2 photoelectrical couplers are all not turned on, voltage is output as high level, this potential pulse
Signal inverted device shaping, as interrupt request singal INT of electrical network crest voltage to main control unit；
Virtual value 0 ~ the 220V of line voltage or 0 ~ 230V, measures the peak value 230*=325.27V, divider resistance R of voltage211
And R212Value 990M Ω and 10M Ω, i.e. intrinsic standoff ratio take 99:1 respectively.1st solid-state relay SSR1 can be selected for solid-state relay type
Number KSI240A25, the 2nd solid-state relay SSR2, the 3rd solid-state relay SSR2 can be selected for solid-state relay model KSI240A10.
As it is shown on figure 3, described residual voltage signal condition unit 30 includes dividing potential drop and follow circuit 31, absolute value circuit
32；
Dividing potential drop and the composition of follow circuit 31 and function and the dividing potential drop of electrical network crest voltage detector unit 20 and follow circuit
21 is identical, L and the N end of the input of dividing potential drop and follow circuit 31 and electrical equipment 5 residual voltage to be measured or L and E end or N and
E end is connected, the output end voltage U of dividing potential drop and follow circuit 31inIt is the residual voltage conditioned signal after dividing potential drop, output end voltage
UinInput is to absolute value circuit 32；
Absolute value circuit 32 includes the 1st amplifier A1 , the 2nd amplifier A2, diode D31、D32, resistance R31、R32、R33、R34With
R35；Resistance R31、R32, diode D31Negative electrode, the 1st amplifier A1Inverting input foot the 2 and the 2nd amplifier A2In-phase input end foot 3
It is connected, the 1st amplifier A1In-phase input end foot 3 ground connection；Resistance R31The other end and R33, dividing potential drop and the outfan of follow circuit 31
UinIt is connected, resistance R33The other end and R34、R35, the 2nd amplifier A2Inverting input foot 2 be connected, resistance R35The other end and
2 amplifiers A2Outfan Uout2Foot 1 is connected；Diode D31Anode, diode D32Negative electrode and the 1st amplifier A1Outfan Uout1Foot 1
It is connected, resistance R32And R34The other end and diode D32Anode is connected.
Work as Uin> 0 time, D31Cut-off, D32Conducting, then
Uout1=-*Uin
Uout2=**Uin-*Uin
Work as Uin< when 0, D31Conducting, D32Cut-off, Uout1=0, then
Uout2=-*Uin
Take R31=R32=R33= R35 =R, R34=0.5 R, Uout2=
Absolute value circuit carries out reversal, the residual voltage detecting system residue to electrical equipment to be measured to input voltage
Polarity of voltage is insensitive.
As shown in Figure 4, described main control unit 40 is with MCU Atmega128 as core；The foot PB4(14 of Atmega128),
Foot PB5(15), foot PB6(16) respectively with the 1st solid-state relay SSR1(1), the 2nd solid-state relay SSR2(2), the 3rd solid-state continues
Electrical equipment SSR3(3) control end be connected, electrical network crest voltage interrupt request singal INT of electrical network crest voltage detector unit 20 connects
Enter the foot INT0(25 of MCU Atmega128), the output signal U of residual voltage signal condition unit 30out2Access MCU
The foot ADC0(61 of Atmega128)；The foot RXD(27 of MCU Atmega128), foot TXD(28) be connected with host computer PC.
As it is shown in figure 5, the flow process of high accuracy residual voltage detection method includes that residual voltage detection prepares flow process, residue electricity
Pressure testing process (being described as a example by GB4706.1-2005)；
Residual voltage detection preparation flow process:
Host computer PC human-computer interaction interface selects the GB (such as choosing GB4706.1-2005) of detection foundation, really
Recognize or revise the GB presented detection parameters default value (such as power-off start detection time: ts=1s, detection number of times: N=10
Secondary, qualified residual voltage higher limit: V0=34V), input entrance normal operating conditions after electrical equipment to be measured powers on and taken
Between t0；Detection operator confirms the detection configuration file of after-cost time residual voltage, and configuration file downloads to residual voltage inspection
The main control unit of examining system reservation one backup in host computer PC；
Residual voltage testing process:
(1) interruption of electrical network crest voltage is closed；
(2) the 1st solid-state relay SSR1 conductings, the 2nd solid-state relay SSR2 and the 3rd solid-state relay SSR3 cut-off, prolong
Time t0；
(3) the 1st solid-state relay SSR1 conductings, the 2nd solid-state relay SSR2 conducting, the 3rd solid-state relay SSR3 cut-off,
Open electrical network crest voltage to interrupt；
Responsive electricity grid crest voltage interrupt, the 1st solid-state relay SSR1 cut-off, the 2nd solid-state relay SSR2 cut-off, the 3rd
Solid-state relay SSR3 cut-off, closes electrical network crest voltage and interrupts, employing " access immediately " technology collection residual voltage value:
Time delay t11Ms (995ms), the 1st solid-state relay SSR1 cut-off, the 2nd solid-state relay SSR2 cut-off, the 3rd solid-state
Relay SSR3 turns on,
Time delay t12Ms (5ms), gathers residual voltage value, the 1st solid-state relay SSR1 cut-off, the 2nd solid-state relay SSR2
Cut-off, the 3rd solid-state relay SSR3 cut-off；
(4) N=N-1, wherein: N is the detection number of times of residual voltage
N ≠ 0 goes to step (2)；
(5) residual voltage detection data packaging file is uploaded to host computer PC, terminates.
The application program of host computer PC is civilian according to detection configuration file, the residual voltage detection data packing of residual voltage
Part, makes the examining report of residual voltage.
Claims (4)
1. a high accuracy residual voltage detecting system, it is characterised in that system includes the 1st solid-state relay SSR1(1), the 2nd solid
State relay SSR2(2), the 3rd solid-state relay SSR3(3), electrical network crest voltage detector unit (20), residual voltage signal adjust
Reason unit (30), main control unit (40)；
Electrical network (4) and the 1st solid-state relay SSR1(1), the 2nd solid-state relay SSR2(2) input be connected, the 2nd solid-state continues
Electrical equipment SSR2(2) outfan be connected with main control unit (40) through electrical network crest voltage detector unit (20), the 1st solid-state relay
SSR1(1) outfan and electrical equipment to be measured (5), the 3rd solid-state relay SSR3(3) input be connected, the 3rd solid-state relay
Device SSR3(3) outfan be connected with main control unit (40) through residual voltage signal condition unit (30), main control unit (40) with
Host computer PC (6) is connected；The detection parameter that main control unit (40) issues according to host computer PC (6), controlling residual voltage detection is
System, acquisition process residual voltage detection data；
Described electrical network crest voltage detector unit (20) include dividing potential drop and follow circuit (21), high pass hold resistance circuit (22), zero
Point testing circuit (23)；Dividing potential drop and follow circuit (21) include divider resistance R211、 R212, amplifier LM124；High pass holds resistance circuit
(22) electric capacity C is included22, resistance R22；Zero-detection circuit (23) include 2 photoelectrical coupler PC817, phase inverter 74HC04 and
Resistance R23；
Divider resistance R211And R212Electrical network (4), divider resistance R are accessed in series connection, two ends211And R212Common port and amplifier LM124
In-phase input end foot 3 be connected, the inverting input foot 2 of the amplifier LM124 composition that is connected with the outfan foot 1 of amplifier LM124 is electric
Pressure follower；Amplifier LM124 outfan foot 1 and electric capacity C22Connected, electric capacity C22The other end be divided into two-way: the first via and resistance
R22Ground connection after being connected, the second tunnel is connected with 2 photoelectrical coupler PC817 of input reverse parallel connection；Photoelectrical coupler PC817's
Collector output is in parallel and is connected with the input of phase inverter, the emitter stage outfan earth of photoelectrical coupler, resistance
R23One end be connected with the collector output of photoelectrical coupler, resistance R23Another termination VCC；The output of phase inverter is as electricity
Interrupt request singal INT of net crest voltage.
A kind of high accuracy residual voltage detecting system the most according to claim 1, it is characterised in that described residual voltage
Signal condition unit (30) includes dividing potential drop and follow circuit (31), absolute value circuit (32)；
Dividing potential drop and the composition of follow circuit (31) and function and the dividing potential drop of electrical network crest voltage detector unit (20) and follow circuit
(21) identical, the input of dividing potential drop and follow circuit (31) and L and the N end of electrical equipment to be measured (5) residual voltage or L and E
End or N with E end are connected, dividing potential drop and the output end voltage U of follow circuit (31)inIt is the residual voltage conditioned signal after dividing potential drop, defeated
Go out terminal voltage UinInput to absolute value circuit (32)；
Absolute value circuit (32) includes the 1st amplifier A1 , the 2nd amplifier A2, diode D31、D32, resistance R31、R32、R33、R34And R35；
Resistance R31、R32, diode D31Negative electrode, the 1st amplifier A1Inverting input foot the 2 and the 2nd amplifier A2In-phase input end foot 3 phase
Even, the 1st amplifier A1In-phase input end foot 3 ground connection；Resistance R31The other end and R33, dividing potential drop and the outfan of follow circuit (31)
UinIt is connected, resistance R33The other end and R34、R35, the 2nd amplifier A2Inverting input foot 2 be connected, resistance R35The other end and
2 amplifiers A2Outfan Uout2Foot 1 is connected；Diode D31Anode, diode D32Negative electrode and the 1st amplifier A1Outfan Uout1Foot 1
It is connected, resistance R32And R34The other end and diode D32Anode is connected.
A kind of high accuracy residual voltage detecting system the most according to claim 1, it is characterised in that described main control unit
(40) with MCU Atmega128 as core；The foot PB4(14 of Atmega128), foot PB5(15), foot PB6(16) solid with the 1st respectively
State relay SSR1(1), the 2nd solid-state relay SSR2(2), the 3rd solid-state relay SSR3(3) control end be connected, electrical network peak
Electrical network crest voltage interrupt request singal INT of threshold voltage detector unit (20) accesses the foot INT0(25 of MCU Atmega128),
The output signal U of residual voltage signal condition unit (30)out2Access the foot ADC0(61 of MCU Atmega128)；MCU
The foot RXD(27 of Atmega128), foot TXD(28) be connected with host computer PC (6).
4. the high accuracy residual voltage detection method using system as claimed in claim 1, it is characterised in that high accuracy is surplus
The flow process of remaining voltage detection method includes that residual voltage detection prepares flow process, residual voltage testing process；
Residual voltage detection preparation flow process:
Host computer PC human-computer interaction interface selects the GB of detection foundation, confirms or revise the detection parameter of the GB presented
Default value, inputs entrance normal operating conditions required time t after electrical equipment to be measured powers on0；Detection operator generates after confirming
The detection configuration file of this residual voltage, configuration file downloads to the main control unit of residual voltage detecting system and upper
Machine PC retains a backup；
Residual voltage testing process:
(1) interruption of electrical network crest voltage is closed；
(2) the 1st solid-state relay SSR1 conductings, the 2nd solid-state relay SSR2 and the 3rd solid-state relay SSR3 cut-off, time delay t0；
(3) the 1st solid-state relay SSR1 conductings, the 2nd solid-state relay SSR2 conducting, the 3rd solid-state relay SSR3 cut-off, open electricity
Net crest voltage interrupts；
Responsive electricity grid crest voltage interrupts, the 1st solid-state relay SSR1 cut-off, the 2nd solid-state relay SSR2 cut-off, the 3rd solid-state
Relay SSR3 cut-off, closes electrical network crest voltage and interrupts, employing " access immediately " technology collection residual voltage value:
Time delay t11Ms, the 1st solid-state relay SSR1 cut-off, the 2nd solid-state relay SSR2 cut-off, the 3rd solid-state relay SSR3 lead
It is logical,
Time delay t12Ms, gather residual voltage value, the 1st solid-state relay SSR1 cut-off, the 2nd solid-state relay SSR2 cut-off, the 3rd
Solid-state relay SSR3 ends；
(4) N=N-1, wherein: N is the detection number of times of residual voltage
N ≠ 0 goes to step (2)；
(5) residual voltage detection data packaging file is uploaded to host computer PC, terminates.
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| CN105158544A (en) * | 2015-09-25 | 2015-12-16 | 中检集团南方电子产品测试（深圳）有限公司 | Measurer and measuring method for measuring human contact current and terminal discharge capacity |
| CN106199141B (en) * | 2016-08-31 | 2018-08-17 | 四川新环佳科技发展有限公司 | A kind of residual voltage detecting system |
| CN106199142B (en) * | 2016-08-31 | 2018-08-14 | 四川新环佳科技发展有限公司 | A kind of residual voltage detection method |
| CN106841912B (en) * | 2017-01-13 | 2019-01-18 | 浙江大学 | The accurate positioning auxiliary device and method of power cable fault |
| CN113655279B (en) * | 2021-08-13 | 2023-09-26 | 海南师范大学 | Insulation resistance value detection method during disconnection of electric automobile power battery |
| CN113655277B (en) * | 2021-08-13 | 2023-09-26 | 海南师范大学 | Insulation resistance value detection method during disconnection of electric automobile power battery |
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