CN103487699B - The digital detection system of earth leakage protective device and high-precision detection method - Google Patents

Abstract

The digital detection system of a kind of earth leakage protective device of disclosure and high-precision detecting method, system includes transformator, pressure regulator, crowbar circuit, load current detection module, the T-shaped tune flow module of 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. The present invention adopts the current over-zero voltage-regulating technique of electronic contactless formula SSR, in conjunction with pressure regulation crowbar circuit, can effectively weaken the electric arc ablation degree to tap during pressure regulation; T-shaped network and SSR array realize the digitized of residual current and adjust stream, solve simulation and adjust the shortcomings such as stream method low precision, less reliable; The high pass of current peak time point holds resistance detection scheme, improves accuracy of detection; The detection system of digitized framework has efficiently, high accuracy and highly reliable feature.

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, particularly relate to the digital detection system of earth leakage protective device and high-precision detection method.

Background technology

China reaches thousands because of the personnel death caused that gets an electric shock every year, and because leaking electricity, the economic loss caused is several hundred million unit; Earth leakage protective device is then that one is effective prevents electric shock from hurting 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; the appellation that the called after earth leakage protective device of China and Japan, Europe adopt is electric leakage earthing breaker (ELCB), and the technical term of the U.S. is then ground-fault interrupter (GFCD). National standard is pointed out, earth leakage protective device refers in particular to " under prescribed conditions, when residual current meets or exceeds set-point can the mechanical switch electrical equipment of automatic shutoff circuit or combined electrical apparatus "; Earth leakage protective device is widely used under the wideling popularize of country, and gets an electric shock reducing the person and play huge effectiveness in leakage fire. 1912, Germany's invention voltage operation 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 operation 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 current electronic current action type earth leakage protective device accounts for about the 90% of continent total output; Term earth leakage protective device is conceived to characterize function or the usefulness of protector; and term residual current operated protective device lay particular emphasis on characterize protector technical characteristic, be namely different from the technical characteristic of early voltage action type, therefore country variant in respective application scenario, identical product be frequently used different terms sanctified by usage.

Earth leakage protective device is made up of residual current detection parts, intermediate link and electrical apparatus release actuator; Detection part is zero sequence current mutual inductor, detects the current signal of residual current, current signal is converted into the intermediate link treatable voltage of institute or power signal; Intermediate link processes voltage or power signal; Electrical apparatus release actuator is controlled by intermediate link, maintains or cuts off protected main circuit power. Residual operating current value, electric leakage non-operating current value and break are three the important technology indexs evaluating earth leakage protective device performance, and difficulty maximum be the accuracy of detection of break--precisely determine and put ten minutes difficulties the movement time of electrical apparatus release actuator; The reliability of detection system and detection efficiency then depend on the reliability with voltage adjustment of on-load device--arcing can be caused with voltage adjustment of on-load and arcing damages the reliability of detection system; Therefore, effective acquisition is earth leakage protective device technical specification accurately, depends on earth leakage protective device detection system and the detection method of high-efficiency high-accuracy. Earth leakage protective device detection system includes that load voltage is adjustable, the adjustable detection power supply of residual current; the pressure regulation actuator of load voltage, residual current tune stream actuator; 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.

There are Shanghai Si Yuan instrument and equipment factory, Shanghai Electric Appliances Science Inst, Xi'an Zhong Feng science and technology Electric Appliance Equipment Co., Ltd etc. in the domestic manufacturer of earth leakage protective device testing instrument, and there are Japanese Gong Li company and Bei Han company of Germany etc. in external producer; Above-mentioned detector obtains the technical parameter of earth leakage protective device based on analogue technique, and parameter detecting speed is slow, efficiency is low, and manual operation intensity is high, error is big, and testing process is complicated; The record of testing result, record processing all by being accomplished manually, automation and intelligentification level low, less reliable; Testing staff must possess higher technological literacy simultaneously, moreover single equipment there is no method and completes whole detection projects of residual current operated protective device function. Domestic be engaged in earth leakage protective device detection system (instrument) producer limited, the R&D institution such as institute, colleges and universities very few especially, thus earth leakage protective device detection system (instrument) technological progress relatively slow; For colleges and universities, being absorbed in earth leakage protective device and the research and development of earth leakage protective device detection system (instrument) except Hebei University of Technology's phase, only minority colleges and universities set foot in once in a while. At present, the basic technical features of domestic earth leakage protective device detection system is:

The method regulate, by contact type voltage regulator, the voltage detecting power supply, namely being switched by transformer tapping realizes pressure regulation, and the contribution of Hebei University of Technology is the manual voltage regulation substituting early stage with the pressure regulation of motor+driver; But electronic pressure regulation cannot eliminate the arc phenomenon in tap changing process, the tap ablation defect that electric arc causes still exists; Additionally, the regulation precision of contact type voltage regulator is low, response speed is slow, structure is complicated, maintenance work amount is big.

Follow the traditional regulation method of analog rheostat, carry out the tune stream of residual current;Analog rheostat hinders the automatization (automatization of detection process and detection parameter processing) of detection system, and the energy consumption of analog rheostat tune stream method is also considerable simultaneously.

The current zero-crossing point of detection system power supply device is the optimum time point of pressure regulation, although the etection theory of current zero-crossing point is perfect, but the result of engineering practice is far from each other; Problem is derived from that pressure regulation instruction issuing is in one's hands/electronic to be completed pressure regulation and require time for, the former is different because of person's development agility level, the latter obeys newton law of inertia, the supply frequency of relative 50HZ (corresponding zero point to current peak frequency is 100HZ), hands/electronic pressure regulation execution process seriously delayed--the tap changing time of pressure regulation executor is even greater than the cycle of zero point to current peak; One speech with general it: the pressure regulation theoretical perfect of current zero-crossing point, the pressure regulation of current zero-crossing point is put into practice imperfect, at least less perfect; Therefore, the effective premise of current zero-crossing point voltage-regulating technique is to have the pressure regulation executor of fast response characteristic.

Earth leakage protective device is an up the critical support technology of detection system reliability and efficiency with the high reliability that voltage adjustment of on-load detects, and current over-zero voltage-regulating technique can slacken tap voltage and regulate the arcing of device (TAPCHANGER); But when earth leakage protective device is in heavy duty state, even if applying solid-state relay only with current over-zero pressure regulation single technology to carry out pressure regulation, still cannot get rid of pressure regulation completely and causing the probability of arcing and arcing to detect, to voltage adjustment of on-load, the negative effect that system reliability causes; Therefore, the pressure regulation crowbar circuit under design heavy condition is necessary, and pressure regulation crowbar circuit is favorably improved 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, industry is reached common understanding through expired exploration: the time starting point of electrical apparatus release actuator 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 and effectively detect residual current time to peak point; Once it is determined that the time point of residual current peak value, just break can be obtained and obtain residual current peak value, just can directly release electric leakage non-operating current value and residual operating current value from residual current peak value.

Obviously, the detection system of existing earth leakage protective device and detection method urgently improve raising. It is contemplated that fill this class. At present, the intellectual property achievement of earth leakage protective device detection system and detection method is few, and most of intellectual property focuses on earth leakage protective device but not the detection system of earth leakage protective device and detection method; 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, it determines protector whether operation irregularity.

Patent of invention " surge protector detecting device based on temperature sensor " (application number 200910067800.4); surge protector detecting device based on temperature sensor is proposed; detection surge suppression device temperature, analyzes the status information drawing characteristic and the device of surge protector this time flowing through electric current.

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 transformator connects commutator; the outfan parallel connection direct voltmeter of commutator, series AC contactless contactor, DC ammeter, test jack and adjustable resistance.

Patent of invention " has the RCD of self-diagnostic function " (patent No. ZL200710105744.X); a kind of RCD with self-diagnostic function is proposed; it includes parts and the custom circuit of the protectors such as protector, ZCT, dropout shunt opening coil, residual current process circuit, rectification circuit, controllable silicon SCR, also includes self diagnosis indicating circuit and/or self diagnosis warning circuit and/or self diagnosis protection circuit.

Above-mentioned benefit our pursuits, it is proposed that the framework of earth leakage protective device detection system and detection method, have certain reference value, but explore achievement and still suffer from limitation. Therefore, it is 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, transform the detection system of earth leakage protective device and detection method by digital technology: propose the digital detection system architecture of earth leakage protective device, and efficiently, high accuracy and highly reliable detection method; Digital electric source apparatus--abandon mechanical contact-type pressure regulation actuator, adopt electronic contactless formula pressure regulation actuator--the current over-zero voltage-regulating technique of solid-state relay SSR of exploitation earth leakage protective device detection system, and set up the pressure regulation crowbar circuit under earth leakage protective device heavy condition; Give up simulation slide-wire potentiometer to adjust stream method, adjust stream a kind of method proposing effective detection residual current time to peak point by T-shaped resistor network--the high pass of residual current time to peak point holds resistance detection technique.

Summary of the invention

It is an object of the invention to overcome the deficiencies in the prior art, it is provided that the digital detection system of a kind of earth leakage protective device and high-precision detecting method.

The digital detection system of earth leakage protective device includes transformator, 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;

Former limit the access civil power of 220V, the transformer secondary of transformator are connected with SSR array and constitute SSR array pressure regulator, and pressure regulation crowbar circuit is by transformator T, extinguishing arc resistance R₂₀₁, extinguishing arc solid-state relay SSR₂₀₁Composition, the output of SSR array pressure regulator is connected with the former limit of pressure regulation crowbar circuit transformator T, earth leakage protective device, earth leakage protective device load successively, and SSR array is implemented SSR array 1 by sampling processing and control module and controlled; Extinguishing arc resistance R₂₀₁With extinguishing arc solid-state relay SSR₂₀₁In parallel, be connected to the two ends of transformator T secondary, solid-state relay SSR₂₀₁SSR is implemented by sampling processing and control module₂₀₁Control; Turn ratio 1:N, the SSR of the former secondary of transformator T₂₀₁Moment before earth leakage protective device heavy duty pressure regulation that and if only if switching disconnects, and namely transformator T former limit equivalence accesses N²×R₂₀₁, reduce electric current when earth leakage protective device pressure regulation switches and absorb arcing energy when earth leakage protective device detection system pressure regulating switches, all the other time SSR₂₀₁All Guan Bi, i.e. extinguishing arc resistance R₂₀₁By extinguishing arc solid-state relay SSR₂₀₁Short 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 nurse one's health traverse the Hall current sensor that sampling module shares from load current detection module and load current, Hall current sensor gathers a road of signal and through signal conditioning circuit to sampling processing and controls module, obtain the load current value of earth leakage protective device, Hall current sensor gathers another road of signal through load current detection module, generate load current interrupt requests and to sampling processing and control module, switch as SSR array pressure regulator SSR array, namely the triggering signal that the SSR array 1 of SSR array pressure regulator pressure regulation controls,

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 sampling processing and control module and controlled, the live wire of SSR array pressure regulator output nurses one's health traverse the Hall current sensor that sampling module shares from residual current peak detection block and residual current, Hall current sensor gathers a road of signal and through signal conditioning circuit to sampling processing and controls module, obtain the residual electricity flow valuve of earth leakage protective device, Hall current sensor gathers another road of signal and holds resistance and current over-zero testing circuit through high pass, generate residual current peak value interrupt requests and to sampling processing and control module, time starting point as earth leakage protective device electrical apparatus release action, the i.e. time starting point of break index,

Transformer secondary sequentially by 0.5,1,2 ... 128V amount to 9 windings and constitute, the pressure regulator of SSR array includes 18 SSR, every 2 SSR are that 9 groups, pressure regulation resolution 0.5V are counted in a combination; The residual current T-shaped tune flow module 400 of SSR array is made up of T-shaped resistor network and 16 SSR, every 2 SSR be a combination count 8 groups, adjust flow point resolution be 1/511i_MAX、i_MAXIt is that T-shaped resistor network adjusts the upper limit rated value flowed; Residual current peak detection block and residual current conditioning sampling module, load current detection module and load current conditioning sampling module are set up indirectly circuit each through magnetic field with detection system and are connected; Digital electric source apparatus is to sampling processing and controls module output residual current peak value interrupt requests, load current interrupt request singal; sampling processing and the module that controls pass through residual current conditioning sampling module and load current is nursed one's health sampling module and obtained the load current value of the residual electricity flow valuve of earth leakage protective device, earth leakage protective device, and the SSR array 1 that digital electric source apparatus response sample processes and control module is assigned controls, solid-state relay SSR₂₀₁Control, SSR array 2 control instruction.

Described load current conditioning sampling module includes Hall current sensor, 2 Zener diode 2CW53, amplifier LM124; Pressure regulator output traverse from the Hall current sensor that load current conditioning sampling module and load current detection module share, Zener diode D₈₁₁With Zener diode D₈₁₂One end ground connection after reverse parallel connection, the other end and resistance R₈₁₁, resistance R₈₁₂, electric capacity C₈₁₁It is connected with the output OUT terminal of Hall current sensor, resistance R₈₁₁With electric capacity C₈₁₁Other end ground connection; Resistance R₈₁₂The other end and electric capacity C₈₁₂, electric capacity C₈₁₃It is connected, electric capacity C₈₁₂Other end ground connection, electric capacity C₈₁₃The other end and resistance R₈₂₁It is connected; Resistance R₈₂₁The other end and resistance R₈₂₃, electric capacity C₈₂₁It is connected with the inverting input foot 2 of amplifier, resistance R₈₂₃With electric capacity C₈₂₁The other end and resistance R₈₂₄, amplifier outfan foot 1 be connected; In-phase input end foot 3 and the resistance R of amplifier₈₂₂, electric capacity C₈₂₂It is connected, resistance R₈₂₂Another termination+2.5V; Resistance R₈₂₄The other end and electric capacity C₈₂₃Be connected, to sampling processing and control module output earth leakage protective device load current signal, electric capacity C₈₂₃With electric capacity C₈₂₂Other end ground connection; Hall current sensor gathers the load current signal of earth leakage protective device, nurses one's health the filtering of sampling module, amplification, level translation through load current, becomes sampling processing and controls the electrode signal (0～5V) that module can gather;

The residual current conditioning composition of sampling module, 26S Proteasome Structure and Function and load current conditioning sampling module are similar, repeat no more.

Described sampling processing and control module are made up of PLCS7-2001010, touch screen MT506T, both are by special RS485 communication cable intersection number evidence, touch screen finishing man-machine interaction and the post processing of detection data, the sampling of detection data and the control of detection system are then undertaken by PLC, and PLCS7-200 includes CPU226CN module, digital quantity inputs/go out module EM223, analog input/go out module EM235 and power module (NES-75-24);

Digital quantity inputs/goes out the DO of module EM223₁、DO₂、……DO₉Output constitutes SSR array 1 and controls, DO₁₀Output performs SSR₂₀₁Control, DO₁₁、DO₁₂、……DO₁₈Output constitutes SSR array 2 and controls; Simulation inputs/goes out first input channel of module EM235 and gathers earth leakage protective device load current value AI₁, second input channel of EM235 gathers earth leakage protective device residual electricity flow valuve AI₂; The interrupt requests INT of the middle fracture 1 input load current over-zero detection module of CPU226CN module₁, the middle fracture 2 of CPU226CN module inputs the interrupt requests INT of residual current peak detection block₂。

The high-precision detecting method of the digital detection system of earth leakage protective device includes detection and prepares flow process, band voltage adjustment of on-load testing process and residual current detection flow process; 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_Δno, residual operating current I_Δok、I_ΔFor residual current, residual current peak value variable array I_Δ_ peak [i], i=1,2,3,4;

Detection prepares flow process: on touch screen human-computer interaction interface, input the rated residual operating current value I of earth leakage protective device to be measured_Δn, residual current detection initial value I_ΔoDetection increment value Δ I with residual current_Δ, specified break T_break, load current value with the detection voltage parameter table of voltage adjustment of on-load, earth leakage protective device, " load current value of earth leakage protective device " of current value=setting adjust the earth leakage protective device load accessing earth leakage protective device, making load current conditioning sampling module upload;

With voltage adjustment of on-load testing process: from the voltage parameter table detected with voltage adjustment of on-load, secondary circulation read in a magnitude of voltage according to the order of sequence, if voltage parameter table is empty, terminate, otherwise carry out band voltage adjustment of on-load detection with the magnitude of voltage of reading,

Heavy duty pressure regulation state, opens interruption 1 i.e. " load current interrupt requests " and enables, and response is interrupted 1 request, carried out SSR₂₀₁Control namely to disconnect SSR₂₀₁, carry out SSR array 1 and control, pressure regulation, then carry out SSR₂₀₁Control namely to close SSR₂₀₁, close interruption 1 i.e. " load current interrupt requests " and forbid, call residual current detection flow process;

Non-heavy duty pressure regulation state, opens interruption 1 i.e. " load current interrupt requests " enable, and response is interrupted 1 request, carried out SSR array 1 control and pressure regulation, closes interruption 1 i.e. " load current interrupt requests " and forbids, calls residual current detection flow process;

Residual current detection flow process: read in the coherent detection parameter I of residual current_Δn、I_Δo、ΔI_Δ, I_Δ=I_Δ0, arrange sampling processing and control module intervalometer=100ms,

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 interruption 2 and make " residual current peak value interrupt requests " to enable, open interruption 3 and make " controlling the request of module timer interruption " to enable,

2 i.e. " residual current peak value interrupt requests ", I is interrupted in 2-1, response_ΔCurrent value that _ peak [i]=residual current conditioning sampling module is uploaded, the time of residual current time to peak point tpeak [i]=residual current peak value interrupt requests, if i=4, close interruption 2 i.e. " residual current peak value interrupt requests " forbids, closes interruption 3 to be that " controlling the request of module timer interruption " is forbidden and turn " 3 ", otherwise i=i+1 returning " 2-1 "

Namely 2-2, response interruption 3 control the 100ms timer interruption of module, close and interrupt 2 i.e. " residual current peak value interrupt requests " forbids, closes interruption 3 to be that " controlling the request of module timer interruption " is forbidden, read in whole residual electricity flow valuves, first null residual electricity flow valuve of search and time t_zero, the t_break=t_zero-tpeak [1] of correspondence, residual operating current I that residual current conditioning sampling module is uploaded_Δok=I_Δ_ peak [1] and turn " 4 ",

3、I_Δno=I_ΔThe middle position meansigma methods of _ peak [i], I_Δ=I_Δ+ΔI_ΔIf, I_Δ≥I_ΔnTurn the end point of " with voltage adjustment of on-load testing process ", otherwise turn " 1 ",

4, the starting point of " with voltage adjustment of on-load testing process " is returned.

The present invention is compared with background technology, have the beneficial effect that employing electronic contactless formula pressure regulation actuator--the current over-zero voltage-regulating technique of solid-state relay SSR, and the pressure regulation crowbar circuit set up under earth leakage protective device heavy condition carries out pressure regulation, effectively slacken the tap ablation degree of electric arc, overcome the shortcomings such as contact type voltage regulator automatization level is low, low precision, response speed are slow, structure is complicated; Stream adjusted by the digitized realizing earth leakage protective device residual current by T-shaped resistor network and SSR array, solves simulation slide-wire potentiometer and adjusts the difficult problems such as the intrinsic low precision of stream method, less reliable, automatization level are low; Give up the detection scheme directly detecting residual current time to peak point, the high pass proposing detection residual current time to peak point holds resistance detection scheme--and residual current peakvalue's checking problem is changed into high pass and holds the zero point test problems of resistance circuit output electric current, improve accuracy of detection and the real-time of current peak; Detected residual current and load current by Hall current sensor, because direct electrical communication does not occur the circuit of testing circuit Yu electric current place to be measured, so detection does not affect the circuit parameter at electric current place to be measured, contribute to picking up the raising surveying precision; Earth leakage protective device detection system adopts digitized framework to achieve the automatization that detection is omnidistance, has efficient, high accuracy and highly reliable feature.

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 sampling processing and the schematic diagram controlling module;

Fig. 4 (a) is the high-precision detecting method flow chart of earth leakage protective device detection system;

The detection that Fig. 4 (b) is the present invention prepares flow chart;

Fig. 4 (c) is the band voltage adjustment of on-load overhaul flow chart of the present invention;

Fig. 4 (d) is the residual current detection flow chart of the present invention.

Detailed description of the invention

Earth leakage protective device can be divided into by number of poles and the current loop number of master switch: one pole two wires/bis-pole/bis-pole three line/tri-pole/tri-pole four line and quadrupole earth leakage protective device; Commonly one pole two wires earth leakage protective device and three pole four line earth leakage protective devices, consider from the visual angle of earth leakage protective device Cleaning Principle, and one pole two wires earth leakage protective device and three pole four line earth leakage protective devices are without substantial difference; Considering the terseness, without loss of generality described, the present invention launches to discuss as far as the digital detection system of one pole two wires earth leakage protective device; Dummy suffix notation illustrates: solid-state relay (SolidStateRelay) is abridged SSR; Technical term illustrates: Testing index adopts the main flow term of 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 is praised highly when describing detection system; Therefore, the leakage current of the present invention and residual current have identical intension.

As shown in figures 1-4, the digital detection system of earth leakage protective device includes transformator 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;

Former limit the access civil power of 220V, the transformer secondary of transformator are connected with SSR array and constitute SSR array pressure regulator, and pressure regulation crowbar circuit 201 is by transformator T, extinguishing arc resistance R₂₀₁, extinguishing arc solid-state relay SSR₂₀₁Composition, the output of SSR array pressure regulator is connected with the former limit of pressure regulation crowbar circuit 201 transformator T, earth leakage protective device 600, earth leakage protective device load 700 successively, and SSR array is implemented SSR array 1 controlled by sampling processing and control module 1000;Extinguishing arc resistance R₂₀₁With extinguishing arc solid-state relay SSR₂₀₁In parallel, be connected to the two ends of transformator T secondary, solid-state relay SSR₂₀₁SSR is implemented by sampling processing and control module₂₀₁Control; Turn ratio 1:N, the SSR of the former secondary of transformator T₂₀₁Moment before earth leakage protective device heavy duty pressure regulation that and if only if switching disconnects, and namely transformator T former limit equivalence accesses N²×R₂₀₁, reduce electric current when earth leakage protective device pressure regulation switches and absorb arcing energy when earth leakage protective device detection system pressure regulating switches, all the other time SSR₂₀₁All Guan Bi, i.e. extinguishing arc resistance R₂₀₁By extinguishing arc solid-state relay SSR₂₀₁Short 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 nurse one's health traverse the Hall current sensor that sampling module shares from load current detection module and load current, Hall current sensor gathers a road of signal and through signal conditioning circuit to sampling processing and controls module, obtain the load current value of earth leakage protective device, Hall current sensor gathers another road of signal through load current detection module, generate load current interrupt requests and to sampling processing and control module, switch as SSR array pressure regulator SSR array, namely the triggering signal that the SSR array 1 of SSR array pressure regulator pressure regulation controls,

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 sampling processing and control module and controlled, the live wire of SSR array pressure regulator output nurses one's health traverse the Hall current sensor that sampling module shares from residual current peak detection block and residual current, Hall current sensor gathers a road of signal and through signal conditioning circuit to sampling processing and controls module, obtain the residual electricity flow valuve of earth leakage protective device, Hall current sensor gathers another road of signal and holds resistance and current over-zero testing circuit through high pass, generate residual current peak value interrupt requests and to sampling processing and control module, time starting point as earth leakage protective device electrical apparatus release action, the i.e. time starting point of break index,

Transformator 100 secondary sequentially by 0.5,1,2 ... 128V amount to 9 windings and constitute, the pressure regulator 200 of SSR array includes 18 SSR, every 2 SSR are that 9 groups, pressure regulation resolution 0.5V are counted in a combination; The residual current T-shaped tune flow module 400 of SSR array is made up of T-shaped resistor network and 16 SSR, every 2 SSR be a combination count 8 groups, adjust flow point resolution be 1/511i_MAX、i_MAXIt is that T-shaped resistor network adjusts the upper limit rated value flowed; Residual current peak detection block and residual current conditioning sampling module, load current detection module and load current conditioning sampling module are set up indirectly circuit each through magnetic field with detection system and are connected; Digital electric source apparatus is to controlling module output residual current peak value interrupt requests, load current interrupt request singal; controlling module and pass through residual current conditioning sampling module and the load current value of the load current conditioning sampling module acquisition residual electricity flow valuve of earth leakage protective device, earth leakage protective device, the SSR array 1 that digital electric source apparatus response sample processes and control module is assigned controls, solid-state relay SSR₂₀₁Control, SSR array 2 control instruction.

Described load current conditioning sampling module 800 includes Hall current sensor 810,2 Zener diode 2CW53820, amplifier LM124830;Pressure regulator output traverse from the Hall current sensor that load current conditioning sampling module and load current detection module 300 share, Zener diode D₈₁₁With Zener diode D₈₁₂One end ground connection after reverse parallel connection, the other end and resistance R₈₁₁, resistance R₈₁₂, electric capacity C₈₁₁It is connected with the output OUT terminal of Hall current sensor, resistance R₈₁₁With electric capacity C₈₁₁Other end ground connection; Resistance R₈₁₂The other end and electric capacity C₈₁₂, electric capacity C₈₁₃It is connected, electric capacity C₈₁₂Other end ground connection, electric capacity C₈₁₃The other end and resistance R₈₂₁It is connected; Resistance R₈₂₁The other end and resistance R₈₂₃, electric capacity C₈₂₁It is connected with the inverting input foot 2 of amplifier, resistance R₈₂₃With electric capacity C₈₂₁The other end and resistance R₈₂₄, amplifier outfan foot 1 be connected; In-phase input end foot 3 and the resistance R of amplifier₈₂₂, electric capacity C₈₂₂It is connected, resistance R₈₂₂Another termination+2.5V; Resistance R₈₂₄The other end and electric capacity C₈₂₃Be connected, to sampling processing and control module output earth leakage protective device load current signal, electric capacity C₈₂₃With electric capacity C₈₂₂Other end ground connection; Hall current sensor gathers the load current signal of earth leakage protective device, nurses one's health the filtering of sampling module, amplification, level translation through load current, becomes sampling processing and controls the electrode signal (0～5V) that module can gather;

The residual current conditioning composition of sampling module, 26S Proteasome Structure and Function and load current conditioning sampling module are similar, repeat no more.

Described sampling processing and control module 1000 are made up of PLCS7-2001010, touch screen MT506T1020, both are by special RS485 communication cable intersection number evidence, touch screen finishing man-machine interaction and the post processing of detection data, the sampling of detection data and the control of detection system are then undertaken by PLC, and PLCS7-200 includes CPU226CN module, digital quantity inputs/go out module EM223, analog input/go out module EM235 and power module (NES-75-24);

Digital quantity inputs/goes out the DO of module EM223₁、DO₂、……DO₉Output constitutes SSR array 1 and controls, DO₁₀Output performs SSR₂₀₁Control, DO₁₁、DO₁₂、……DO₁₈Output constitutes SSR array 2 and controls; Simulation inputs/goes out first input channel of module EM235 and gathers earth leakage protective device load current value AI₁, second input channel of EM235 gathers earth leakage protective device residual electricity flow valuve AI₂; The interrupt requests INT of the middle fracture 1 input load current over-zero detection module of CPU226CN module₁, the middle fracture 2 of CPU226CN module inputs the interrupt requests INT of residual current peak detection block₂。

The high-precision detecting method of the digital detection system of earth leakage protective device includes detection and prepares flow process, band voltage adjustment of on-load testing process and residual current detection flow process; 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_Δno, residual operating current I_Δok、I_ΔFor residual current, residual current peak value variable array I_Δ_ peak [i], i=1,2,3,4;

Detection prepares flow process: on touch screen human-computer interaction interface, input the rated residual operating current value I of earth leakage protective device to be measured_Δn, residual current detection initial value I_ΔoDetection increment value Δ I with residual current_Δ, specified break T_break, load current value with the detection voltage parameter table of voltage adjustment of on-load, earth leakage protective device, " load current value of earth leakage protective device " of current value=setting adjust the earth leakage protective device load accessing earth leakage protective device, making load current conditioning sampling module upload;

With voltage adjustment of on-load testing process: from the voltage parameter table detected with voltage adjustment of on-load, secondary circulation read in a magnitude of voltage according to the order of sequence, if voltage parameter table is empty, terminate, otherwise carry out band voltage adjustment of on-load detection with the magnitude of voltage of reading,

Heavy duty pressure regulation state, opens interruption 1 i.e. " load current interrupt requests " and enables, and response is interrupted 1 request, carried out SSR₂₀₁Control namely to disconnect SSR₂₀₁, carry out SSR array 1 and control, pressure regulation, then carry out SSR₂₀₁Control namely to close SSR₂₀₁, close interruption 1 i.e. " load current interrupt requests " and forbid, call residual current detection flow process;

Non-heavy duty pressure regulation state, opens interruption 1 i.e. " load current interrupt requests " enable, and response is interrupted 1 request, carried out SSR array 1 control and pressure regulation, closes interruption 1 i.e. " load current interrupt requests " and forbids, calls residual current detection flow process;

Residual current detection flow process: read in the coherent detection parameter I of residual current_Δn、I_Δo、ΔI_Δ, I_Δ=I_Δ0, arrange sampling processing and control module intervalometer=100ms,

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 interruption 2 and make " residual current peak value interrupt requests " to enable, open interruption 3 and make " controlling the request of module timer interruption " to enable,

2 i.e. " residual current peak value interrupt requests ", I is interrupted in 2-1, response_ΔCurrent value that _ peak [i]=residual current conditioning sampling module is uploaded, the time of residual current time to peak point tpeak [i]=residual current peak value interrupt requests, if i=4, close interruption 2 i.e. " residual current peak value interrupt requests " forbids, closes interruption 3 to be that " controlling the request of module timer interruption " is forbidden and turn " 3 ", otherwise i=i+1 returning " 2-1 "

Namely 2-2, response interruption 3 control the 100ms timer interruption of module, close and interrupt 2 i.e. " residual current peak value interrupt requests " forbids, closes interruption 3 to be that " controlling the request of module timer interruption " is forbidden, read in whole residual electricity flow valuves, first null residual electricity flow valuve of search and time t_zero, the t_break=t_zero-tpeak [1] of correspondence, residual operating current I that residual current conditioning sampling module is uploaded_Δok=I_Δ_ peak [1] and turn " 4 ",

3、I_Δno=I_ΔThe middle position meansigma methods of _ peak [i], I_Δ=I_Δ+ΔI_ΔIf, I_Δ≥I_ΔnTurn the end point of " with voltage adjustment of on-load testing process ", otherwise turn " 1 ",

4, the starting point of " with voltage adjustment of on-load testing process " is returned.

1:I is described_Δno=I_ΔThe middle position meansigma methods of _ peak [i] refers to,

After rejecting minimum and maximum value from 4 residual current peak values, summation average.

$I_{\mathrm{\Δ}\_average}={\∫}_0^{tpeak\[4\]-tpeak\[1\]}{I}_{\mathrm{\Δ}}\left(t\right)dt\÷(1000\÷50\×2)$

$\begin{array}{c}\{\underset{1}{\overset{4}{\Σ}}\left|I_{\mathrm{\Δ}\_peak}\[i\]-I_{\mathrm{\Δ}\_average}\right|-\min (I_{\mathrm{\Δ}\_peak}\[1\]-I_{\mathrm{\Δ}\_average},I_{\mathrm{\Δ}\_peak}\[2\]-I_{\mathrm{\Δ}\_average},\\ I_{\mathrm{\Δ}\_peak}\[3\]-I_{\mathrm{\Δ}\_average},I_{\mathrm{\Δ}\_peak}\[4\]-I_{\mathrm{\Δ}\_average})-\max (I_{\mathrm{\Δ}\_peak}\[1\]-I_{\mathrm{\Δ}\_average},\\ I_{\mathrm{\Δ}\_peak}\[2\]-I_{\mathrm{\Δ}\_average},I_{\mathrm{\Δ}\_peak}\[3\]-I_{\mathrm{\Δ}\_average},I_{\mathrm{\Δ}\_peak}\[4\]-I_{\mathrm{\Δ}\_average}\left)\right\}/2,\end{array}$

Illustrate 2: produce 4 residual current peak values time=1000 ÷ 50 × 2=40ms, once 100ms timer interruption occurs, the electrical apparatus release actuator that represents earth leakage protective device has carried out trip operation.

Illustrate 3: I occurs_Δ≥I_Δn, represent that the electrical apparatus release actuator of earth leakage protective device is stuck or other component failure of earth leakage protective device.

Illustrating 4: under different detection voltage conditions, PLC uploads break t_break, electric leakage non-operating current I respectively_Δno, residual operating current I_Δok; Touch screen reads and uploads data, according to 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, it is characterized in that digital detection system includes transformator (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),

The civil power of 220V is accessed on the former limit of transformator, and transformer secondary is connected with SSR array and constitutes SSR array pressure regulator, and pressure regulation crowbar circuit (201) is by transformator T, extinguishing arc resistance R₂₀₁, solid-state relay SSR₂₀₁Composition, the output of SSR array pressure regulator is connected with the former limit of pressure regulation crowbar circuit (201) transformator T, earth leakage protective device (600), earth leakage protective device load (700) successively, and SSR array is implemented SSR array 1 by sampling processing and control module (1000) and controlled;Extinguishing arc resistance R₂₀₁With solid-state relay SSR₂₀₁Parallel connection, is connected to the two ends of transformator T secondary, solid-state relay SSR₂₀₁Solid-state relay SSR is implemented by sampling processing and control module₂₀₁Control; Turn ratio 1:N, the SSR of the former secondary of transformator T₂₀₁Moment before earth leakage protective device heavy duty pressure regulation that and if only if switching disconnects, and namely transformator T former limit equivalence accesses N²×R₂₀₁, reduce electric current during earth leakage protective device pressure regulation switching arcing energy when the digital detection system pressure regulating absorbing earth leakage protective device switches, all the other time SSR₂₀₁All close, i.e. extinguishing arc resistance R₂₀₁By solid-state relay SSR₂₀₁Short circuit, pressure regulation crowbar circuit does not affect the output of SSR array pressure regulator;

The live wire of SSR array pressure regulator output or zero line nurse one's health traverse the Hall current sensor that sampling module shares from load current detection module and load current; Hall current sensor gathers a road of signal and through signal conditioning circuit to sampling processing and controls module; obtain the load current value of earth leakage protective device; Hall current sensor gathers another road of signal through load current detection module, generates load current interrupt requests INT₁To sampling processing and control module, switch as SSR array pressure regulator SSR array, i.e. the triggering signal that the SSR array 1 of SSR array pressure regulator pressure regulation controls;

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 sampling processing and control module and controlled; The live wire of SSR array pressure regulator output nurses one's health traverse the Hall current sensor that sampling module shares from residual current peak detection block and residual current; Hall current sensor gathers a road of signal and through signal conditioning circuit to sampling processing and controls module; obtain the residual electricity flow valuve of earth leakage protective device; Hall current sensor gathers another road of signal and holds resistance and current over-zero testing circuit through high pass, generates residual current peak value interrupt requests INT₂To sampling processing and control module, as the time starting point of earth leakage protective device electrical apparatus release action, i.e. the time starting point of break index;

Transformator (100) secondary sequentially by 0.5,1,2 ... 128V amount to 9 windings and constitute, it is that a combination counts 9 groups that SSR array pressure regulator (200) includes 18 SSR, every 2 SSR, pressure regulation resolution 0.5V; SSR array residual current T-shaped tune flow module (400) is made up of T-shaped resistor network and 16 SSR, and every 2 SSR are that a combination counts 8 groups, and adjusting flow point resolution is 1/511i_MAX, i_MAXIt is that T-shaped resistor network adjusts the upper limit rated value flowed; Residual current peak detection block and residual current conditioning sampling module, load current detection module and load current conditioning sampling module are set up indirectly circuit each through magnetic field with detection system and are connected; Digital electric source apparatus is to sampling processing and controls module output residual current peak value interrupt requests INT₂, load current interrupt requests INT₁Signal; sampling processing and the module that controls are nursed one's health sampling module by residual current conditioning sampling module and load current and are obtained the residual electricity flow valuve of earth leakage protective device; the load current value of earth leakage protective device, the SSR array 1 that digital electric source apparatus response sample processes and control module is assigned controls, solid-state relay SSR₂₀₁Control, SSR array 2 control instruction.

2. the digital detection system of a kind of earth leakage protective device according to claim 1, it is characterised in that described load current conditioning sampling module (800) includes Hall current sensor (810), 2 Zener diode 2CW53 (820), amplifier LM124 (830); Pressure regulator output traverse from the Hall current sensor that load current conditioning sampling module and load current detection module (300) share, Zener diode D₈₁₁With Zener diode D₈₁₂One end ground connection after reverse parallel connection, the other end and resistance R₈₁₁, resistance R₈₁₂, electric capacity C₈₁₁It is connected with the output OUT terminal of Hall current sensor, resistance R₈₁₁With electric capacity C₈₁₁Other end ground connection; Resistance R₈₁₂The other end and electric capacity C₈₁₂, electric capacity C₈₁₃It is connected, electric capacity C₈₁₂Other end ground connection, electric capacity C₈₁₃The other end and resistance R₈₂₁It is connected; Resistance R₈₂₁The other end and resistance R₈₂₃, electric capacity C₈₂₁It is connected with the inverting input foot 2 of amplifier LM124, resistance R₈₂₃The other end and electric capacity C₈₂₁The other end and resistance R₈₂₄, amplifier LM124 outfan foot 1 be connected; In-phase input end foot 3 and the resistance R of amplifier LM124₈₂₂, electric capacity C₈₂₂It is connected, resistance R₈₂₂Another termination+2.5V; Resistance R₈₂₄The other end and electric capacity C₈₂₃It is connected, electric capacity C₈₂₃The other end and electric capacity C₈₂₂Other end ground connection; Hall current sensor gathers the load current signal of earth leakage protective device, nurses one's health the filtering of sampling module, amplification, level translation through load current, becomes sampling processing and controls electrode signal 0～5V that 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) by PLCS7-200 (1010), touch screen MT506T (1020) forms, both are by special RS485 communication cable intersection number evidence, the post processing of touch screen MT506T finishing man-machine interaction and detection data, the sampling of detection data and the control of detection system are then undertaken by PLCS7-200, PLCS7-200 includes CPU226CN module, digital quantity inputs/goes out module EM223, analog input/go out module EM235 and power module NES-75-24,

Digital quantity inputs/goes out the DO of module EM223₁、DO₂、……DO₉Output constitutes SSR array 1 and controls, DO₁₀Output performs solid-state relay SSR₂₀₁Control, DO₁₁、DO₁₂、……DO₁₈Output constitutes SSR array 2 and controls; Simulation inputs/goes out first input channel of module EM235 and gathers earth leakage protective device load current value AI₁, second input channel of EM235 gathers earth leakage protective device residual electricity flow valuve AI₂; The load current interrupt requests INT of the middle fracture 1 input load current over-zero detection module of CPU226CN module₁, the middle fracture 2 of CPU226CN module inputs the residual current peak value interrupt requests INT of residual current peak detection block₂。

4. the high-precision detecting method of the digital detection system using earth leakage protective device as claimed in claim 1, it is characterized in that high-precision detecting method includes detection and prepares flow process, band voltage adjustment of on-load testing process and residual current detection flow process, 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 adopts GB GB6829-95 symbol I_Δno, residual operating current I_Δok, I_ΔFor residual current, residual current peak value variable array I_Δ_ peak [i], i=1,2,3,4;

Detection prepares flow process: on touch screen MT506T human-computer interaction interface, input the rated residual operating current value I of earth leakage protective device to be measured_Δn, residual current detection initial value I_ΔoDetection increment value Δ I with residual current_Δ, specified break T_break, with voltage adjustment of on-load detection voltage parameter table, earth leakage protective device load current value, adjust the earth leakage protective device load accessing earth leakage protective device, make load current nurse one's health " load current value of earth leakage protective device " of current value=setting that sampling module is uploaded;

With voltage adjustment of on-load testing process: from the detection voltage parameter table of voltage adjustment of on-load, a magnitude of voltage is read in secondary circulation according to the order of sequence, if voltage parameter table sky, terminates, otherwise carry out band voltage adjustment of on-load detection with the magnitude of voltage read in,

Heavy duty pressure regulation state, opens interruption 1 i.e. " load current interrupt requests INT₁" enable, 1 request is interrupted in response, carries out solid-state relay SSR₂₀₁Control namely to disconnect SSR₂₀₁, carry out SSR array 1 and control, pressure regulation, then carry out solid-state relay SSR₂₀₁Control namely to close SSR₂₀₁, close and interrupt 1 i.e. " load current interrupt requests INT₁" forbid, call residual current detection flow process;

Non-heavy duty pressure regulation state, opens interruption 1 i.e. " load current interrupt requests INT₁" enable, responding interruption 1 request, carry out SSR array 1 control and pressure regulation, it is that " load current interrupt requests " forbids that pass interrupts 1, calls residual current detection flow process;

Residual current detection flow process: read in the coherent detection parameter I of residual current_Δn、I_Δo、ΔI_Δ, I_Δ=I_Δ0, sampling processing is set and controls the intervalometer=100ms of module,

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 interruption 2 and make " residual current peak value interrupt requests INT₂" enable, open interruption 3 and make " sampling processing and control module timer interruption request " to enable,

2 i.e. " residual current peak value interrupt requests INT is interrupted in 2-1, response₂", I_ΔCurrent value that _ peak [i]=residual current conditioning sampling module is uploaded, the time of residual current time to peak point tpeak [i]=residual current peak value interrupt requests, if i=4, close interruption 2 i.e. " residual current peak value interrupt requests " and forbid, close interruption 3 i.e. " sampling processing and control module timer interruption request " to forbid and turn " 3 ", otherwise i=i+1 returns " 2-1 "

2-2, response are interrupted 3 i.e. sampling processing and control the 100ms timer interruption of module, close and interrupt 2 i.e. " residual current peak value interrupt requests INT₂" forbid; close interruption 3 i.e. " sampling processing and control module timer interruption request " and forbid; whole residual electricity flow valuves that reading residual current conditioning sampling module is uploaded; search for first null residual electricity flow valuve and time t_zero, the t_break=t_zero-tpeak [1] of correspondence, residual operating current I_Δok=I Δ _ peak [1] and turn " 4 ",

3、I_Δno=I_ΔThe middle position meansigma methods of _ peak [i], I_Δ=I_Δ+ΔI_ΔIf, I_Δ≥I_ΔnTurn the end point of " with voltage adjustment of on-load testing process ", otherwise turn " 1 ",

4, the starting point of " with voltage adjustment of on-load testing process " is returned.