CN103487699A - Digital detecting system for leakage protector and high-precision detecting method - Google Patents

Digital detecting system for leakage protector and high-precision detecting method Download PDF

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CN103487699A
CN103487699A CN201310459251.1A CN201310459251A CN103487699A CN 103487699 A CN103487699 A CN 103487699A CN 201310459251 A CN201310459251 A CN 201310459251A CN 103487699 A CN103487699 A CN 103487699A
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current
ssr
module
detection
earth leakage
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CN103487699B (en
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盛刚伟
郑涛
盛英英
傅炳
吴明光
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Zhejiang University ZJU
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Zhejiang University ZJU
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Abstract

The invention discloses a digital detecting system for a leakage protector and a high-precision detecting method. The system comprises a transformer, a voltage regulator, an arc extinction circuit, a load current zero-cross detecting module, a residual current T-type regulating module, a residual current peak detecting module, the leakage protector, a leakage protector load, a load current conditioning and sampling module, a residual current conditioning and sampling module and a sampling processing and control module. According to the digital detecting system for the leakage protector and the high-precision detecting method, through the adoption of a current zero-cross voltage regulating technology of an electronic contactless type SSR and the combination of a voltage regulation and arc extinction circuit, the erosion degree of a tap by electric arcs in a voltage regulating process can be weakened effectively; digital current regulation of residual currents is achieved through a T-type network and an SSR array, and the defects that a simulation current regulating method is poor in precision and reliability and the like are overcome; detection precision is improved through a high pass capacitance and resistance detecting scheme of current peak time points; a digital framework detection system has the advantages of being high in efficiency, precision and reliability.

Description

The digital detection system of earth leakage protective device and high-precision detection method
Technical field
The invention belongs to the detection technique category of earth leakage protective device, refer to especially digital detection system and the high-precision detection method of earth leakage protective device.
Background technology
China reaches thousands because of the personnel death that electric shock causes every year, and the economic loss caused because of electric leakage is several hundred million units; Earth leakage protective device be a kind of effective prevent from getting an electric shock hurt sb.'s feelings, the device that leakage fire, electrical equipment damage.The RCD of IEEE definition is called for short residual current operated protective device; China and Japanese called after earth leakage protective device, the appellation that Europe adopts are electric leakage earthing breakers (ELCB), and the technical term of the U.S. is ground-fault interrupter (GFCD).National standard points out, earth leakage protective device refers in particular to " under rated condition, mechanical switch electrical equipment or combined electrical apparatus that can automatic shutoff circuit when residual current meets or exceeds set-point "; Earth leakage protective device has obtained being widely used under the wideling popularize of country, and is bringing into play huge effectiveness aspect the electric shock of the reduction person and leakage fire.1912, German invention voltage action type electric leakage earthing breaker; 1940, France proposed electric current action type electric leakage earthing breaker; Last century the fifties, the leading position of the rapid occuping market of electric current action type earth leakage protective device, voltage action type earth leakage protective device is cleaned out.1964, Japan released electronic current action type earth leakage protective device, and European countries are inclined to the development of electromagnetic type electric current action type earth leakage protective device all the time; 1966, China started to develop earth leakage protective device, and electronic current action type earth leakage protective device accounts for 90% left and right of continent total production at present; The term earth leakage protective device is conceived to characterize function or the usefulness of protector; and the term residual current operated protective device lays particular emphasis on the technical characterictic that characterizes protector, the technical characterictic that is different from the early voltage action type, so country variant is usually used different terms sanctified by usage at application scenario, identical product separately.
Earth leakage protective device is comprised of residual current detection parts, intermediate link and electrical apparatus release topworks; Detection part is zero sequence current mutual inductor, detect residual current current signal, current signal is converted into to the intermediate link treatable voltage of institute or power signal; Intermediate link is processed voltage or power signal; Electrical apparatus release topworks is controlled by intermediate link, maintains or cut off protected main circuit power.Residual operating current value, electric leakage non-operating current value and break are three important technology indexs estimating the earth leakage protective device performance, and the difficulty maximum is the accuracy of detection of break--put actuation time of precisely determining electrical apparatus release topworks ten minutes difficulties; The reliability of detection system and detection efficiency depend on the reliability with the voltage adjustment of on-load device--and with voltage adjustment of on-load can cause arcing, arcing diminishes the reliability of detection system; Therefore, effective acquisition is the earth leakage protective device technical indicator accurately, depends on earth leakage protective device detection system and the detection method of high-efficiency high-accuracy.The earth leakage protective device detection system comprises the detection power supply that load voltage is adjustable, residual current is adjustable; the pressure regulation topworks of load voltage, the tune of residual current stream topworks; the conditioning acquisition module of earth leakage protective device load current signal; the conditioning acquisition module of residual current signal, the processing module of master control and detection data.
The domestic manufacturer of earth leakage protective device testing instrument has Shanghai to think instrument and equipment far away factory, Shanghai Electric Appliances Science Inst, Xi'an Zhong Feng science and technology Electric Appliance Equipment Co., Ltd etc., and there are Japan vertical company and German Bei Han company etc. altogether in external producer; Above-mentioned detector obtains the technical parameter of earth leakage protective device based on analogue technique, parameter detecting speed is slow, efficiency is low, and manual operation intensity is high, error is large, and the testing process complexity; The record of testing result, the processing of record all by manually completing, the automation and intelligentification level is low, less reliable; The testing staff must possess higher technological literacy simultaneously, moreover single equipment there is no whole test items that method completes the residual current operated protective device function.The domestic producer that is engaged in earth leakage protective device detection system (instrument) is limited, and the R&D institutions such as research institute, colleges and universities are very few especially, therefore the technical progress of earth leakage protective device detection system (instrument) is relatively slow; Take colleges and universities as example, except the research and development of absorbed earth leakage protective device of He north Gong sparetime university's Long phase and earth leakage protective device detection system (instrument), only have minority colleges and universities to set foot in once in a while.At present, the basic technical features of domestic earth leakage protective device detection system is:
By contact type voltage regulator, adjusting detects the voltage of power supply, the method for switching by transformer tapping realizes pressure regulation, and the contribution of Hebei University of Technology is to substitute early stage manual voltage regulation with the pressure regulation of the moving machine Ju of motor+biography; But electronic pressure regulation can't be eliminated the arc phenomenon in the tap changing process, the tap ablation defect that electric arc causes still exists; In addition, slow, the complex structure of low, the response speed of the pressure regulation precision of contact type voltage regulator, O&M workload are large.
The traditional control method that follows analog variohm, the tune that carries out residual current flows; Analog variohm has hindered the robotization (robotization that testing process and detected parameters are processed) of detection system, and simultaneously analog variohm adjusts the energy consumption of stream method also considerable.
The current zero-crossing point of detection system supply unit is the optimum time point of pressure regulation, although the etection theory perfection of current zero-crossing point, the result of engineering practice is far from each other; Problem is derived from the pressure regulation instruction issuing in one's handsly/electronic to be completed pressure regulation and needs the time, the former is because the quick level of people's reaction is different, the latter obeys newton law of inertia, and the implementation of the supply frequency of 50HZ (corresponding zero point to current peak frequency is 100HZ), hand/electronic pressure regulation seriously lags behind relatively--and the tap changing time of pressure regulation actuator even is greater than the cycle of zero point to current peak; One speech with general it: the pressure regulation of current zero-crossing point is theoretical perfect, and it is imperfect, at least so perfect that the pressure regulation of current zero-crossing point is put into practice; Therefore, the effective prerequisite of current zero-crossing point voltage-regulating technique is the pressure regulation actuator with fast response characteristic.
The high reliability that earth leakage protective device band voltage adjustment of on-load detects is the critical support technology that promotes detection system reliability and efficiency, and the current over-zero voltage-regulating technique can slacken the arcing of tap voltage regulating device (TAPCHANGER); But when earth leakage protective device is in the heavy duty state, even if only adopt current over-zero pressure regulation single technology application solid-state relay to carry out pressure regulation, still can't get rid of pressure regulation fully and cause that the possibility of arcing and arcing are to the negative effect caused with voltage adjustment of on-load detection system reliability; Therefore, the pressure regulation crowbar circuit under the design heavy condition is necessary, and the pressure regulation crowbar circuit contributes to improve efficiency and the reliability of earth leakage protective device detection system.
The time to peak point of residual current is related to the accuracy of detection of electric leakage non-operating current value, residual operating current value and break index, the exploration of industry Jing Guo Long phase is reached common understanding: the time starting point of electrical apparatus release topworks action is the time point of first peak value of residual current, and what something lost was shaken is the simple solution that there is no so far effective detection residual current time to peak point; Once determine the residual current peak value time point, just can obtain break and obtain the residual current peak value, just can directly release from the residual current peak value leak electricity non-operating current value and residual operating current value.
Obviously, detection system and the detection method of existing earth leakage protective device are urgently improved raising.The present invention is intended to fill this class.At present, the intellecture property achievement of earth leakage protective device detection system and detection method is few, and most intellecture properties focuses on earth leakage protective device but not detection system and the detection method of earth leakage protective device; Relevant knowledge property right achievement is substantially blank.More representational relevant knowledge property right Summary on research results is as follows:
Patent of invention " a kind of DC over current protector detection method and system " (patent No. ZL200610170565.X); a kind of DC over current protector detection method and system are proposed; by detecting, amplify the electric parameter at protector two ends, differentiate whether operation irregularity of protector.
Patent of invention " surge protector detecting device based on temperature sensor " (application number 200910067800.4); the surge protector detecting device of proposition based on temperature sensor; detect the surge suppression device temperature, analyze and draw the characteristic of this current flowing and the status information of device of surge protector.
Patent of invention " detecting device for overcurrent protector " (application number 201010213928.X); a kind of detecting device for overcurrent protector is proposed; the secondary coil of transformer connects rectifier; the output terminal parallel connection direct voltage table of rectifier, series connection A.C. contactor switch, DC ammeter, test jack and adjustable resistance.
Patent of invention " RCD with self-diagnostic function " (patent No. ZL200710105744.X); a kind of RCD with self-diagnostic function is proposed; it comprises parts and the custom circuit of the protectors such as protector, zero-sequence transformer, dropout shunt opening coil, residual current treatment circuit, rectification circuit, controllable silicon SCR, also comprises self diagnosis indicating circuit and/or self diagnosis warning circuit and/or self diagnosis holding circuit.
Above-mentioned benefiting our pursuits, proposed framework and the detection method of earth leakage protective device detection system, and certain reference value is arranged, but explore achievement, still has limitation.Therefore, be necessary to base oneself upon existing earth leakage protective device detection system, on the basis of existing achievement in research, do deep research and innovation, detection system and detection method with digital technology transformation earth leakage protective device: the digital detection system framework of earth leakage protective device is proposed, and efficient, high precision and highly reliable detection method; The digital electric source apparatus of the exploitation earth leakage protective device detection system current over-zero voltage-regulating technique of solid-state relay SSR of--abandoning mechanical contact-type pressure regulation topworks, adopt electronic contactless formula pressure regulation topworks--, and set up the pressure regulation crowbar circuit under the earth leakage protective device heavy condition; Give up the simulation slide-wire potentiometer and adjust the stream method, by T-shaped resistor network, adjust stream, and propose a kind of method of effective detection residual current time to peak point--the high pass of residual current time to peak point is held the resistance detection technique.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of digital detection system and high-precision detecting method of earth leakage protective device is provided.
The digital detection system of earth leakage protective device comprises transformer, SSR array pressure regulator, pressure regulation crowbar circuit, load current detection module, the T-shaped tune flow module of SSR array residual current, residual current peak detection block, earth leakage protective device, earth leakage protective device load, load current conditioning sampling module, residual current conditioning sampling module, sampling processing and control module;
Civil power, the transformer secondary that the former edge joint of transformer enters 220V is connected with the SSR array and forms SSR array pressure regulator, and the pressure regulation crowbar circuit is by transformer T, extinguishing arc resistance R 201, extinguishing arc solid-state relay SSR 201form, the output of SSR array pressure regulator is connected with former limit, earth leakage protective device, the earth leakage protective device load of pressure regulation crowbar circuit transformer T successively, and the SSR array is implemented SSR array 1 by sampling processing and control module and controlled; The extinguishing arc resistance R 201with extinguishing arc solid-state relay SSR 201two ends in parallel, as to be connected to transformer T secondary, solid-state relay SSR 201implement SSR by sampling processing and control module 201control; The turn ratio 1:N of the former secondary of transformer T, SSR 201moment before earth leakage protective device heavy duty pressure regulation switching that and if only if disconnects, i.e. the former limit of transformer T access of equal value N 2* R 201, the arcing energy when reducing the electric current in earth leakage protective device pressure regulation when switching and absorbing earth leakage protective device detection system pressure regulation switching, all the other time SSR 201all closed, be the extinguishing arc resistance R 201by extinguishing arc solid-state relay SSR 201short circuit, pressure regulation crowbar circuit do not affect the output of SSR array pressure regulator;
The live wire of SSR array pressure regulator output or zero line pass from load current detection module and the shared Hall current sensor of load current conditioning sampling module, one tunnel of Hall current sensor collection signal through signal conditioning circuit to sampling processing and control module, obtain the load current value of earth leakage protective device, another road of Hall current sensor collection signal is through the load current detection module, generate the load current interrupt request to sampling processing and control module, as SSR array pressure regulator SSR array, switch, it is the trigger pip of SSR array 1 control of SSR array pressure regulator pressure regulation,
The live wire of earth leakage protective device output is connected with the ground protection end of SSR array pressure regulator through the T-shaped tune flow module of SSR array residual current, residual current conditioning sampling module, residual current peak detection block, and the T-shaped tune flow module of SSR array residual current is implemented SSR array 2 by SSR array pressure regulator and controlled, the live wire of SSR array pressure regulator output passes from residual current peak detection block and the shared Hall current sensor of residual current conditioning sampling module, one tunnel of Hall current sensor collection signal through signal conditioning circuit to SSR array pressure regulator, obtain the residual electricity flow valuve of earth leakage protective device, another road of Hall current sensor collection signal holds resistance and current over-zero testing circuit through high pass, generate residual current peak value interrupt request to sampling processing and control module, time starting point as the action of earth leakage protective device electrical apparatus release, it is the time starting point of break index,
The transformer secondary sequentially by 0.5,1,2 ... 128V amounts to 9 windings and forms, and the pressure regulator of SSR array comprises that 18 SSR, every 2 SSR are that 9 groups, pressure regulation resolution 0.5V are counted in a combination; The T-shaped tune flow module of the residual current of SSR array (400) is comprised of T-shaped resistor network and 16 SSR, and every 2 SSR are that a combination counts 8 groups, adjusts stream resolution is 1/511i mAX, i mAXit is the upper limit ratings that T-shaped resistor network is adjusted stream; The residual current peak detection block is all set up indirectly circuit by magnetic field and detection system with residual current conditioning sampling module, load current detection module with load current conditioning sampling module and is connected; The digital electric source apparatus is to control module output residual current peak value interrupt request, load current interrupt request singal; control module nurses one's health sampling module by residual current and load current conditioning sampling module obtains the residual electricity flow valuve of earth leakage protective device, the load current value of earth leakage protective device, and the SSR array 1 that digital electric source apparatus response sample is processed and control module is assigned is controlled, solid-state relay SSR 201control, SSR array 2 steering orders.
Described load current conditioning sampling module comprises Hall current sensor, 2 voltage stabilizing diode 2CW53, amplifier LM124; Pressure regulator output is passed from load current conditioning sampling module and the shared Hall current sensor of load current detection module, voltage stabilizing diode D 811with voltage stabilizing diode D 812end ground connection, the other end and a resistance R after reverse parallel connection 811, resistance R 812, capacitor C 811with the output OUT end of Hall current sensor, be connected, resistance R 811and capacitor C 811other end ground connection; Resistance R 812the other end and capacitor C 812, capacitor C 813be connected, capacitor C 812other end ground connection, capacitor C 813the other end and resistance R 821be connected; Resistance R 821the other end and resistance R 823, capacitor C 821with the inverting input pin 2 of amplifier, be connected, resistance R 823and capacitor C 821the other end and resistance R 824, amplifier output terminal pin 1 be connected; In-phase input end pin 3 and the resistance R of amplifier 822, capacitor C 822be connected, resistance R 822another termination+2.5V; Resistance R 824the other end and capacitor C 823be connected, to the load current signal of sampling processing and control module output earth leakage protective device, capacitor C 823and capacitor C 822other end ground connection; Hall current sensor gathers the load current signal of earth leakage protective device, filtering, amplification, the level translation of nursing one's health sampling module through load current, becomes the unipolarity voltage signal (0~5V) that sampling processing and control module can gather;
The composition of residual current conditioning sampling module, 26S Proteasome Structure and Function and load current conditioning sampling module roughly the same, repeat no more.
Described sampling processing and control module are by PLC S7-200(1010), touch-screen MT506T forms, both are by special-purpose RS485 telecommunication cable Jiao Change data, touch-screen finishing man-machine interaction and detect the aftertreatment of data, the sampling that detects data and the control of detection system and born by PLC, PLC S7-200 comprises that CPU226CN module, digital quantity input/go out module EM223, analog input/go out module EM235 and power module (NES-75-24);
The DO of module EM223 is inputted/gone out to digital quantity 1, DO 2... DO 9output forms SSR array 1 to be controlled, DO 10sSR is carried out in output 201control DO 11, DO 12... DO 18output forms SSR array 2 and controls; The first input channel of analog input/go out module EM235 gathers earth leakage protective device load current value AI 1, the second input channel of EM235 gathers earth leakage protective device residual electricity flow valuve AI 2; The interrupt request INT of the middle fracture 1 input load current over-zero detection module of CPU226CN module 1, the interrupt request INT of the middle fracture 2 input residual current peak detection block of CPU226CN module 2.
The high-precision detecting method of the digital detection system of earth leakage protective device comprises detecting prepares flow process, band voltage adjustment of on-load testing process and residual current detection flow process; the residual current detection flow process is embedded in band voltage adjustment of on-load testing process, symbol description: t_break break, electric leakage non-operating current adopt GB GB6829-95 symbol I Δ no, residual operating current I Δ ok, I Δfor residual current, residual current peak value variable array I Δ _ peak[i], i=1,2,3,4;
Detect and prepare flow process: on the touch-screen human-computer interaction interface, input the rated residual operating current value I of earth leakage protective device to be measured Δ n, residual current detection initial value I Δ odetection increment value Δ I with residual current Δ, specified break T_break, the detection voltage parameter table with voltage adjustment of on-load, the load current value of earth leakage protective device, adjust the access earth leakage protective device the earth leakage protective device load, make " load current value of earth leakage protective device " of the current value that load current conditioning sampling module uploads=setting;
Band voltage adjustment of on-load testing process: from the voltage parameter table detected with voltage adjustment of on-load, each circulation reads in a magnitude of voltage according to the order of sequence, if the voltage parameter table is empty, finishes otherwise be with the voltage adjustment of on-load detection with the magnitude of voltage read in,
Heavy duty pressure regulation state, opening interruption 1 is that " load current interrupt request " enables, response is interrupted 1 request, is carried out SSR 201control and disconnect SSR 201, carry out SSR array 1 and control, pressure regulation, then carry out SSR 201control is closed SSR 201, closing interruption 1 is that " load current interrupt request " forbids, calls the residual current detection flow process;
Non-heavily loaded pressure regulation state, opening interruption 1 is that " load current interrupt request " enables, and 1 control of SSR array is asked, carried out in response interruption 1 is pressure regulation, and it is that " load current interrupt request " forbids that pass interrupts 1, calls the residual current detection flow process;
Residual current detection flow process: the coherent detection parameter I of reading in residual current Δ n, I Δ o, Δ I Δ, I Δ=I Δ 0, the timer=100ms of sampling processing and control module is set,
1, array I Δ _ peak[i]=0, t_break=0, i=1, according to residual current I Δ, carry out SSR array 2 and control--adjust stream, open and interrupt 2 and make " residual current peak value interrupt request " enable, open to interrupt 3 " control module timer interrupt request " enabled,
It is " residual current peak value interrupt request ", I that 2-1, response interrupt 2 Δ _ peakcurrent value, residual current time to peak point t that [i]=residual current conditioning sampling module is uploaded peakthe time of [i]=residual current peak value interrupt request, if i=4 close interrupt 2 " residual current peak value interrupt request " forbid, close that to interrupt 3 be that " control module timer interrupt request " forbids and turn " 3 " otherwise i=i+1 returns to " 2-1 ",
2-2, response interrupt 3 be the 100ms timer of control module interrupt, close interrupt 2 " residual current peak value interrupt request " forbid, close that to interrupt 3 be that " control module timer interrupt request " forbids, read in whole residual electricity flow valuves that residual current conditioning sampling module uploads, search for first null residual electricity flow valuve and corresponding time t_zero, t_break=t_zero-t peak[1], residual operating current I Δ ok=I Δ _ peak[1] and turn " 4 ",
3, I Δ no=I Δ _ peakthe meta mean value of [i], I Δ=I Δ+ Δ I Δif, I Δ>=I Δ nturn the end point of " band voltage adjustment of on-load testing process " otherwise turn " 1 ",
4, return to the starting point of " band voltage adjustment of on-load testing process ".
The present invention compares with background technology, the beneficial effect had is: adopt electronic contactless formula pressure regulation topworks--the current over-zero voltage-regulating technique of solid-state relay SSR, and the pressure regulation crowbar circuit of setting up under the earth leakage protective device heavy condition carries out pressure regulation, effectively slackened the tap ablation degree of electric arc, overcome that the contact type voltage regulator automatization level is low, the shortcomings such as low precision, response speed are slow, complex structure; Realize that by T-shaped resistor network and SSR array the digitizing tune of earth leakage protective device residual current flows, and has solved the simulation slide-wire potentiometer and has adjusted the difficult problems such as stream method intrinsic low precision, less reliable, automatization level are low; The detection scheme of giving up direct-detection residual current time to peak point, propose to detect the high pass appearance resistance detection scheme of residual current time to peak point--change residual current peak value test problems into test problems at zero point that high pass is held the resistance circuit output current, improved accuracy of detection and the real-time of current peak; Detect residual current and load current by Hall current sensor, because direct electrical communication does not occur for the circuit at testing circuit and electric current to be measured place, so detect the circuit parameter that does not affect electric current to be measured place, contribute to pick up the raising of surveying precision; The earth leakage protective device detection system adopts the digitizing framework to realize detecting omnidistance robotization, has efficient, high precision and highly reliable characteristics.
The accompanying drawing explanation
Fig. 1 is the structured flowchart of the digital detection system of earth leakage protective device;
Fig. 2 is the circuit diagram of load current conditioning sampling module;
Fig. 3 is the schematic diagram of sampling processing and control module;
Fig. 4 (a) is the high-precision detecting method process flow diagram of earth leakage protective device detection system;
Fig. 4 (b) is that process flow diagram is prepared in detection of the present invention;
Fig. 4 (c) is band voltage adjustment of on-load overhaul flow chart of the present invention;
Fig. 4 (d) is residual current detection process flow diagram of the present invention.
Embodiment
Earth leakage protective device can be divided into by number of poles and the current return number of main switch: one pole two wires/bis-utmost points/bis-utmost point three lines/tri-utmost points/tri-utmost point four lines and four utmost point earth leakage protective devices; Commonly one pole two wires earth leakage protective device and three utmost point four line earth leakage protective devices, detect the visual angle of principle and consider from earth leakage protective device, and one pole two wires earth leakage protective device and three utmost point four line earth leakage protection Qi And are without substantial difference; Consider the terseness of description, without loss of generality, the present invention only launches to discuss with regard to the digital detection system of one pole two wires earth leakage protective device; Dummy suffix notation explanation: solid-state relay (Solid State Relay) abbreviation SSR; Technical term explanation: detect the main flow term that index adopts domestic earth leakage protective device industry--residual operating current value, electric leakage non-operating current value and break, follow IEEE definition--the RCD that academia praises highly while describing detection system; Therefore, leakage current of the present invention has identical intension with residual current.
As shown in Fig. 1~4, the digital detection system of earth leakage protective device comprises transformer 100, SSR array pressure regulator 200, pressure regulation crowbar circuit 201, load current detection module 300, the T-shaped tune flow module 400 of SSR array residual current, residual current peak detection block 500, earth leakage protective device 600, earth leakage protective device load 700, load current conditioning sampling module 800, residual current conditioning sampling module 900, sampling processing and control module 1000;
Civil power, the transformer secondary that the former edge joint of transformer enters 220V is connected with the SSR array and forms SSR array pressure regulator, and pressure regulation crowbar circuit 201 is by transformer T, extinguishing arc resistance R 201, extinguishing arc solid-state relay SSR 201form, the output of SSR array pressure regulator is connected with former limit, earth leakage protective device 600, the earth leakage protective device load 700 of pressure regulation crowbar circuit 201 transformer T successively, and the SSR array is implemented SSR array 1 by sampling processing and control module 1000 and controlled; The extinguishing arc resistance R 201with extinguishing arc solid-state relay SSR 201two ends in parallel, as to be connected to transformer T secondary, solid-state relay SSR 201implement SSR by sampling processing and control module 201control; The turn ratio 1:N of the former secondary of transformer T, SSR 201moment before earth leakage protective device heavy duty pressure regulation switching that and if only if disconnects, i.e. the former limit of transformer T access of equal value N 2* R 201, the arcing energy when reducing the electric current in earth leakage protective device pressure regulation when switching and absorbing earth leakage protective device detection system pressure regulation switching, all the other time SSR 201all closed, be the extinguishing arc resistance R 201by extinguishing arc solid-state relay SSR 201short circuit, pressure regulation crowbar circuit do not affect the output of SSR array pressure regulator;
The live wire of SSR array pressure regulator output or zero line pass from load current detection module and the shared Hall current sensor of load current conditioning sampling module, one tunnel of Hall current sensor collection signal through signal conditioning circuit to sampling processing and control module, obtain the load current value of earth leakage protective device, another road of Hall current sensor collection signal is through the load current detection module, generate the load current interrupt request to sampling processing and control module, as SSR array pressure regulator SSR array, switch, it is the trigger pip of SSR array 1 control of SSR array pressure regulator pressure regulation,
The live wire of earth leakage protective device output is connected with the ground protection end of SSR array pressure regulator through the T-shaped tune flow module of SSR array residual current, residual current conditioning sampling module, residual current peak detection block, and the T-shaped tune flow module of SSR array residual current is implemented SSR array 2 by SSR array pressure regulator and controlled, the live wire of SSR array pressure regulator output passes from residual current peak detection block and the shared Hall current sensor of residual current conditioning sampling module, one tunnel of Hall current sensor collection signal through signal conditioning circuit to SSR array pressure regulator, obtain the residual electricity flow valuve of earth leakage protective device, another road of Hall current sensor collection signal holds resistance and current over-zero testing circuit through high pass, generate residual current peak value interrupt request to sampling processing and control module, time starting point as the action of earth leakage protective device electrical apparatus release, it is the time starting point of break index,
Transformer 100 secondary sequentially by 0.5,1,2 ... 128V amounts to 9 windings and forms, and the pressure regulator 200 of SSR array comprises that 18 SSR, every 2 SSR are that 9 groups, pressure regulation resolution 0.5V are counted in a combination; The T-shaped tune flow module 400 of the residual current of SSR array is comprised of T-shaped resistor network and 16 SSR, and every 2 SSR are that a combination counts 8 groups, adjusts stream resolution is 1/511i mAX, i mAXit is the upper limit ratings that T-shaped resistor network is adjusted stream; The residual current peak detection block is all set up indirectly circuit by magnetic field and detection system with residual current conditioning sampling module, load current detection module with load current conditioning sampling module and is connected; The digital electric source apparatus is to control module output residual current peak value interrupt request, load current interrupt request singal; control module nurses one's health sampling module by residual current and load current conditioning sampling module obtains the residual electricity flow valuve of earth leakage protective device, the load current value of earth leakage protective device, and the SSR array 1 that digital electric source apparatus response sample is processed and control module is assigned is controlled, solid-state relay SSR 201control, SSR array 2 steering orders.
Described load current conditioning sampling module 800 comprises 810,2 voltage stabilizing diode 2CW53(820 of Hall current sensor), amplifier LM124(830); Pressure regulator output is passed from load current conditioning sampling module and the shared Hall current sensor of load current detection module 300, voltage stabilizing diode D 811with voltage stabilizing diode D 812end ground connection, the other end and a resistance R after reverse parallel connection 811, resistance R 812, capacitor C 811with the output OUT end of Hall current sensor, be connected, resistance R 811and capacitor C 811other end ground connection; Resistance R 812the other end and capacitor C 812, capacitor C 813be connected, capacitor C 812other end ground connection, capacitor C 813the other end and resistance R 821be connected; Resistance R 821the other end and resistance R 823, capacitor C 821with the inverting input pin 2 of amplifier, be connected, resistance R 823and capacitor C 821the other end and resistance R 824, amplifier output terminal pin 1 be connected; In-phase input end pin 3 and the resistance R of amplifier 822, capacitor C 822be connected, resistance R 822another termination+2.5V; Resistance R 824the other end and capacitor C 823be connected, to the load current signal of sampling processing and control module output earth leakage protective device, capacitor C 823and capacitor C 822other end ground connection; Hall current sensor gathers the load current signal of earth leakage protective device, filtering, amplification, the level translation of nursing one's health sampling module through load current, becomes the unipolarity voltage signal (0~5V) that sampling processing and control module can gather;
The composition of residual current conditioning sampling module, 26S Proteasome Structure and Function and load current conditioning sampling module roughly the same, repeat no more.
Described sampling processing and control module 1000 are by PLC S7-200(1010), touch-screen MT506T1020 forms, both are by special-purpose RS485 telecommunication cable Jiao Change data, touch-screen finishing man-machine interaction and detect the aftertreatment of data, the sampling that detects data and the control of detection system and born by PLC, PLC S7-200 comprises that CPU226CN module, digital quantity input/go out module EM223, analog input/go out module EM235 and power module (NES-75-24);
The DO of module EM223 is inputted/gone out to digital quantity 1, DO 2... DO 9output forms SSR array 1 to be controlled, DO 10sSR is carried out in output 201control DO 11, DO 12... DO 18output forms SSR array 2 and controls; The first input channel of analog input/go out module EM235 gathers earth leakage protective device load current value AI 1, the second input channel of EM235 gathers earth leakage protective device residual electricity flow valuve AI 2; The interrupt request INT of the middle fracture 1 input load current over-zero detection module of CPU226CN module 1, the interrupt request INT of the middle fracture 2 input residual current peak detection block of CPU226CN module 2.
The high-precision detecting method of the digital detection system of earth leakage protective device comprises detecting prepares flow process, band voltage adjustment of on-load testing process and residual current detection flow process; the residual current detection flow process is embedded in band voltage adjustment of on-load testing process, symbol description: t_break break, electric leakage non-operating current adopt GB GB6829-95 symbol I Δ no, residual operating current I Δ ok, I Δfor residual current, residual current peak value variable array I Δ _ peak[i], i=1,2,3,4;
Detect and prepare flow process: on the touch-screen human-computer interaction interface, input the rated residual operating current value I of earth leakage protective device to be measured Δ n, residual current detection initial value I Δ odetection increment value Δ I with residual current Δ, specified break T_break, the detection voltage parameter table with voltage adjustment of on-load, the load current value of earth leakage protective device, adjust the access earth leakage protective device the earth leakage protective device load, make " load current value of earth leakage protective device " of the current value that load current conditioning sampling module uploads=setting;
Band voltage adjustment of on-load testing process: from the voltage parameter table detected with voltage adjustment of on-load, each circulation reads in a magnitude of voltage according to the order of sequence, if the voltage parameter table is empty, finishes otherwise be with the voltage adjustment of on-load detection with the magnitude of voltage read in,
Heavy duty pressure regulation state, opening interruption 1 is that " load current interrupt request " enables, response is interrupted 1 request, is carried out SSR 201control and disconnect SSR 201, carry out SSR array 1 and control, pressure regulation, then carry out SSR 201control is closed SSR 201, closing interruption 1 is that " load current interrupt request " forbids, calls the residual current detection flow process;
Non-heavily loaded pressure regulation state, opening interruption 1 is that " load current interrupt request " enables, and 1 control of SSR array is asked, carried out in response interruption 1 is pressure regulation, and it is that " load current interrupt request " forbids that pass interrupts 1, calls the residual current detection flow process;
Residual current detection flow process: the coherent detection parameter I of reading in residual current Δ n, I Δ o, Δ I Δ, I Δ=I Δ 0, the timer=100ms of sampling processing and control module is set,
1, array I Δ _ peak[i]=0, t_break=0, i=1, according to residual current I Δ, carry out SSR array 2 and control--adjust stream, open and interrupt 2 and make " residual current peak value interrupt request " enable, open to interrupt 3 " control module timer interrupt request " enabled,
It is " residual current peak value interrupt request ", I that 2-1, response interrupt 2 Δ _ peakcurrent value, residual current time to peak point t that [i]=residual current conditioning sampling module is uploaded peakthe time of [i]=residual current peak value interrupt request, if i=4 close interrupt 2 " residual current peak value interrupt request " forbid, close that to interrupt 3 be that " control module timer interrupt request " forbids and turn " 3 " otherwise i=i+1 returns to " 2-1 ",
2-2, response interrupt 3 be the 100ms timer of control module interrupt, close interrupt 2 " residual current peak value interrupt request " forbid, close that to interrupt 3 be that " control module timer interrupt request " forbids, read in whole residual electricity flow valuves that residual current conditioning sampling module uploads, search for first null residual electricity flow valuve and corresponding time t_zero, t_break=t_zero-t peak[1], residual operating current I Δ ok=I Δ _ peak[1] and turn " 4 ",
3, I Δ no=I Δ _ peakthe meta mean value of [i], I Δ=I Δ+ Δ I Δif, I Δ>=I Δ nturn the end point of " band voltage adjustment of on-load testing process " otherwise turn " 1 ",
4, return to the starting point of " band voltage adjustment of on-load testing process ".
1:I is described Δ no=I Δ _ peakthe meta mean value of [i] refers to,
Reject minimum and maximum value from 4 residual current peak values after, the average of summation.
I Δ _ average = ∫ 0 tpeak [ 4 ] - tpeak [ 1 ] I Δ ( t ) dt ÷ ( 1000 ÷ 50 × 2 )
{ Σ 1 4 | I Δ _ peak [ i ] - I Δ _ average | - min ( I Δ _ peak [ 1 ] - I Δ _ average , I Δ _ peak [ 2 ] - I Δ _ average , I Δ _ peak [ 3 ] - I Δ _ average , I Δ _ peak [ 4 ] - I Δ _ average ) - max ( I Δ _ peak [ 1 ] - I Δ _ average , I Δ _ peak [ 2 ] - I Δ _ average , I Δ _ peak [ 3 ] - I Δ _ average , I Δ _ peak [ 4 ] - I Δ _ average ) } / 2 ,
Illustrate 2: produce the time=1000 ÷ 50 * 2=40ms of 4 residual current peak values, once the operation of having threaded off of the electrical apparatus release topworks of earth leakage protective device interrupt to occur, represents the 100ms timer.
Illustrate 3: I occurs Δ>=I Δ n, represent stuck or other component failure of earth leakage protective device of the electrical apparatus release topworks of earth leakage protective device.
Illustrate 4: under different detection voltage conditions, PLC uploads respectively break t_break, electric leakage non-operating current I Δ no, residual operating current I Δ ok; Touch-screen reads uploading data, according to the GB6829-95 standard
0.5I Δn≤I Δno<I Δn
I Δno<I Δok≤I Δn
t_break≤T_break
Evaluation.

Claims (4)

1. the digital detection system of an earth leakage protective device, is characterized in that digital detection system comprises transformer (100), SSR array pressure regulator (200), pressure regulation crowbar circuit (201), load current detection module (300), the T-shaped tune flow module of SSR array residual current (400), residual current peak detection block (500), earth leakage protective device (600), earth leakage protective device load (700), load current conditioning sampling module (800), residual current conditioning sampling module (900), sampling processing and control module (1000);
Civil power, the transformer secondary that the former edge joint of transformer enters 220V is connected with the SSR array and forms SSR array pressure regulator, and pressure regulation crowbar circuit (201) is by transformer T, extinguishing arc resistance R 201, extinguishing arc solid-state relay SSR 201form, the output of SSR array pressure regulator is connected with former limit, earth leakage protective device (600), the earth leakage protective device load (700) of pressure regulation crowbar circuit (201) transformer T successively, and the SSR array is implemented SSR array 1 by sampling processing and control module (1000) and controlled; The extinguishing arc resistance R 201with extinguishing arc solid-state relay SSR 201two ends in parallel, as to be connected to transformer T secondary, solid-state relay SSR 201implement SSR by sampling processing and control module 201control; The turn ratio 1:N of the former secondary of transformer T, SSR 201moment before earth leakage protective device heavy duty pressure regulation switching that and if only if disconnects, i.e. the former limit of transformer T access of equal value N 2* R 201, the arcing energy when reducing the electric current in earth leakage protective device pressure regulation when switching and absorbing earth leakage protective device detection system pressure regulation switching, all the other time SSR 201all closed, be the extinguishing arc resistance R 201by extinguishing arc solid-state relay SSR 201short circuit, pressure regulation crowbar circuit do not affect the output of SSR array pressure regulator;
The live wire of SSR array pressure regulator output or zero line pass from load current detection module and the shared Hall current sensor of load current conditioning sampling module, one tunnel of Hall current sensor collection signal through signal conditioning circuit to sampling processing and control module, obtain the load current value of earth leakage protective device, another road of Hall current sensor collection signal is through the load current detection module, generate the load current interrupt request to sampling processing and control module, as SSR array pressure regulator SSR array, switch, it is the trigger pip of SSR array 1 control of SSR array pressure regulator pressure regulation,
The live wire of earth leakage protective device output is connected with the ground protection end of SSR array pressure regulator through the T-shaped tune flow module of SSR array residual current, residual current conditioning sampling module, residual current peak detection block, and the T-shaped tune flow module of SSR array residual current is implemented SSR array 2 by SSR array pressure regulator and controlled, the live wire of SSR array pressure regulator output passes from residual current peak detection block and the shared Hall current sensor of residual current conditioning sampling module, one tunnel of Hall current sensor collection signal through signal conditioning circuit to SSR array pressure regulator, obtain the residual electricity flow valuve of earth leakage protective device, another road of Hall current sensor collection signal holds resistance and current over-zero testing circuit through high pass, generate residual current peak value interrupt request to sampling processing and control module, time starting point as the action of earth leakage protective device electrical apparatus release, it is the time starting point of break index,
Transformer (100) secondary sequentially by 0.5,1,2 ... 128V amounts to 9 windings and forms, and the pressure regulator of SSR array (200) comprises that 18 SSR, every 2 SSR are that 9 groups, pressure regulation resolution 0.5V are counted in a combination; The T-shaped tune flow module of the residual current of SSR array (400) is comprised of T-shaped resistor network and 16 SSR, and every 2 SSR are that a combination counts 8 groups, adjusts stream resolution is 1/511 i mAX, i mAXit is the upper limit ratings that T-shaped resistor network is adjusted stream; The residual current peak detection block is all set up indirectly circuit by magnetic field and detection system with residual current conditioning sampling module, load current detection module with load current conditioning sampling module and is connected; The digital electric source apparatus is to control module output residual current peak value interrupt request, load current interrupt request singal; control module nurses one's health sampling module by residual current and load current conditioning sampling module obtains the residual electricity flow valuve of earth leakage protective device, the load current value of earth leakage protective device, and the SSR array 1 that digital electric source apparatus response sample is processed and control module is assigned is controlled, solid-state relay SSR 201control, SSR array 2 steering orders.
2. the digital detection system of a kind of earth leakage protective device according to claim 1, is characterized in that described load current conditioning sampling module (800) comprises Hall current sensor (810), 2 voltage stabilizing diode 2CW53(820), amplifier LM124(830); Pressure regulator output is passed from load current conditioning sampling module and the shared Hall current sensor of load current detection module (300), voltage stabilizing diode D 811with voltage stabilizing diode D 812end ground connection, the other end and a resistance R after reverse parallel connection 811, resistance R 812, capacitor C 811with the output OUT end of Hall current sensor, be connected, resistance R 811and capacitor C 811other end ground connection; Resistance R 812the other end and capacitor C 812, capacitor C 813be connected, capacitor C 812other end ground connection, capacitor C 813the other end and resistance R 821be connected; Resistance R 821the other end and resistance R 823, capacitor C 821with the inverting input pin 2 of amplifier, be connected, resistance R 823and capacitor C 821the other end and resistance R 824, amplifier output terminal pin 1 be connected; In-phase input end pin 3 and the resistance R of amplifier 822, capacitor C 822be connected, resistance R 822another termination+2.5V; Resistance R 824the other end and capacitor C 823be connected, to the load current signal of sampling processing and control module output earth leakage protective device, capacitor C 823and capacitor C 822other end ground connection; Hall current sensor gathers the load current signal of earth leakage protective device, filtering, amplification, the level translation of nursing one's health sampling module through load current, becomes unipolarity voltage signal 0 ~ 5V that sampling processing and control module can gather.
3. the digital detection system of a kind of earth leakage protective device according to claim 1, it is characterized in that described sampling processing and control module (1000) are by PLC S7-200(1010), touch-screen MT506T(1020) form, both are by special-purpose RS485 telecommunication cable Jiao Change data, the aftertreatment of touch-screen finishing man-machine interaction and detection data, detecting the sampling of data and the control of detection system is born by PLC, PLC S7-200 comprises CPU 226CN module, module EM223 is inputted/gone out to digital quantity, analog input/go out module EM235 and power module (NES-75-24),
The DO of module EM223 is inputted/gone out to digital quantity 1, DO 2... DO 9output forms SSR array 1 to be controlled, DO 10sSR is carried out in output 201control DO 11, DO 12... DO 18output forms SSR array 2 and controls; The first input channel of analog input/go out module EM235 gathers earth leakage protective device load current value AI 1, the second input channel of EM235 gathers earth leakage protective device residual electricity flow valuve AI 2; The interrupt request INT of the middle fracture 1 input load current over-zero detection module of CPU 226CN module 1, the interrupt request INT of the middle fracture 2 input residual current peak detection block of CPU 226CN module 2.
4. a high-precision detecting method that uses the digital detection system of earth leakage protective device as claimed in claim 1; it is characterized in that high-precision detecting method comprises detection preparation flow process, band voltage adjustment of on-load testing process and residual current detection flow process; the residual current detection flow process is embedded in band voltage adjustment of on-load testing process, symbol description: t_ break break, electric leakage non-operating current adopt GB GB6829-95 symbol I Δ no, residual operating current I Δ ok, I Δfor residual current, residual current peak value variable array I Δ_ peak[i], i=1,2,3,4;
Detect and prepare flow process: on the touch-screen human-computer interaction interface, input the rated residual operating current value I of earth leakage protective device to be measured Δ n, residual current detection initial value I Δ odetection increment value Δ I with residual current Δ, specified break T_ break, the detection voltage parameter table with voltage adjustment of on-load, the load current value of earth leakage protective device, adjust the access earth leakage protective device the earth leakage protective device load, make " load current value of earth leakage protective device " of the current value that load current conditioning sampling module uploads=setting;
Band voltage adjustment of on-load testing process: from the voltage parameter table detected with voltage adjustment of on-load, each circulation reads in a magnitude of voltage according to the order of sequence, if the voltage parameter table is empty, finishes otherwise be with the voltage adjustment of on-load detection with the magnitude of voltage read in,
Heavy duty pressure regulation state, opening interruption 1 is that " load current interrupt request " enables, response is interrupted 1 request, is carried out SSR 201control and disconnect SSR 201, carry out SSR array 1 and control, pressure regulation, then carry out SSR 201control is closed SSR 201, closing interruption 1 is that " load current interrupt request " forbids, calls the residual current detection flow process;
Non-heavily loaded pressure regulation state, opening interruption 1 is that " load current interrupt request " enables, and 1 control of SSR array is asked, carried out in response interruption 1 is pressure regulation, and it is that " load current interrupt request " forbids that pass interrupts 1, calls the residual current detection flow process;
Residual current detection flow process: the coherent detection parameter I of reading in residual current Δ n, I Δ o, Δ I Δ, I Δ=I Δ 0, the timer=100ms of sampling processing and control module is set,
1, array I Δ_ peak[i]=0, t_ break=0, i=1, according to residual current I Δ, carry out SSR array 2 and control--adjust stream, open and interrupt 2 and make " residual current peak value interrupt request " enable, open to interrupt 3 " control module timer interrupt request " enabled,
It is " residual current peak value interrupt request ", I that 2-1, response interrupt 2 Δ_ peak[i]=current value, residual current time to peak point t peak[i that residual current conditioning sampling module is uploaded]=time of residual current peak value interrupt request, if i=4 close interrupt 2 " residual current peak value interrupt request " forbid, close that to interrupt 3 be that " control module timer interrupt request " forbids and turn " 3 " otherwise i=i+1 returns to " 2-1 "
2-2, response interrupt 3 be the 100ms timer of control module interrupt, close interrupt 2 " residual current peak value interrupt request " forbid, close that to interrupt 3 be that " control module timer interrupt request " forbids, read in whole residual electricity flow valuves that residual current conditioning sampling module uploads, search for first null residual electricity flow valuve and corresponding time t_zero, t_ break=t_zero-t peak[1], residual operating current I Δ ok=I Δ_ peak[1] and turn " 4 ",
3, I Δ no=I Δ_ peak[i] meta mean value, I Δ=I Δ+ Δ I Δif, I Δ>=I Δ nturn the end point of " band voltage adjustment of on-load testing process " otherwise turn " 1 ",
4, return to the starting point of " band voltage adjustment of on-load testing process ".
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