CN103280980A - Digital power supply device for leakage protector detection system - Google Patents
Digital power supply device for leakage protector detection system Download PDFInfo
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Abstract
The invention discloses a digital power supply device for a leakage protector detection system. The digital power supply device comprises a transformer of which the secondary side consists of 9 windings and 18 taps, a voltage regulator of a solid state relay (SSR) array, a load current zero-cross detection module, a residual current T-type current adjusting module of the SSA array, and a residual current peak detection module. According to the digital power supply device, an SSA electronic contactless voltage regulating actuator replaces a mechanical contact voltage regulating actuator to perform the current zero crossing point voltage regulation of the digital power supply device; the digital current regulation for residual current of a leakage protector is achieved by means of a T-type resistor network and the SSA array, and the residual current peak detection problem is changed to a problem of zero point detection of the output current of a high pass resistance-capacitance circuit; and by the comprehensive application of the technologies, the automation level, the reliability and the detection accuracy of the leakage protector detection system are improved.
Description
Technical field
The invention belongs to the technology category of earth leakage protective device detection system supply unit, refer to the technical field of earth leakage protective device detection system digital electric source apparatus especially.
Background technology
The personnel death that China causes because of electric shock every year reaches thousands of people, and the economic loss that causes because of electric leakage is several hundred million units; Earth leakage protective device then be a kind of effective prevent from getting an electric shock hurt sb.'s feelings the device that electric leakage fire, electric equipment damage.RCD is called for short residual current operated protective device, the called after earth leakage protective device of China and Japan, the appellation in Europe electric leakage earthing breaker (ELCB), and the technical term of the U.S. then is ground-fault interrupter (GFCD).National standard points out that earth leakage protective device refers in particular to " under rated condition, mechanical switch electrical equipment or the combined electrical apparatus of energy automatic shutoff circuit when residual current meets or exceeds set-point "; Earth leakage protective device has obtained being extensive use of under the wideling popularize of country, and is bringing into play huge effectiveness aspect the electric shock of the reduction person and the electric 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 began to develop earth leakage protective device, and electronic current action type earth leakage protective device accounts for about 90% of continent total output 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, namely is different from early stage voltage action type technical characterictic, so country variant usually uses different terms sanctified by usage at different application scenarios, identical product.
Earth leakage protective device is made up of residual current detection part, intermediate link and release actuator; Detection part is zero sequence current mutual inductor, detect residual current current signal, current signal is converted into the intermediate link treatable voltage of institute or power signal; Intermediate link is handled voltage or power signal; Release actuator is controlled by intermediate link, keeps or cut off protected main circuit power.Residual operating current value, electric leakage non-operating current value and break-time are to estimate the most important three technology index of earth leakage protective device; Efficiently obtain earth leakage protective device technical indicator accurately, depend on the earth leakage protective device detection system of high-efficiency high-accuracy.The earth leakage protective device detection system of high-efficiency high-accuracy comprises the detection supply unit that load voltage is adjustable, residual current is adjustable, the collection of residual current signal, conditioning module, the processing module of master control and detection data, the pressure regulation actuator of load voltage, the accent of residual current stream actuator; Obviously, the detection supply unit that load voltage is adjustable, residual current is adjustable is the basis of high-efficiency high-accuracy earth leakage protective device detection system.
The domestic manufacturer of earth leakage protective device detector 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 upright 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, and parameter detecting speed is slow, efficient is low, and manual operation intensity height, error are big, and the testing process complexity; The record of testing result, the processing of record all by manually finish, the automation and intelligentification level is low, less reliable; The testing staff must possess higher technological literacy simultaneously, moreover single equipment still can't be finished whole test items of residual current operated protective device function.The domestic producer that is engaged in earth leakage protective device detection system (instrument) is limited, and R﹠D institutions such as research institute, colleges and universities are very few especially, so the technological progress of earth leakage protective device detection system (instrument) is slow relatively; Be example with colleges and universities, except He north Gong sparetime university's Long phase is absorbed in the research and development of earth leakage protective device and earth leakage protective device detection system (instrument), only have units 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 supply unit is:
Regulate the method that detects power source voltage, namely switches by transformer tapping by contact type voltage regulator and realize pressure regulation, the contribution of Hebei University of Technology is to substitute early stage manual voltage regulation with electronic pressure regulation; But electronic pressure regulation can't be eliminated the arc phenomenon in the tap changing process, and the tap ablation defective 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 big.
The traditional control method that follows analog variable resistance, the accent that carries out residual current flows; Analog variable resistance has hindered the automation (automation of detected parameters and testing process) of detection system, and simultaneously analog variable resistance transfers 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, though the etection theory perfection of current zero-crossing point, the result of engineering practice is far from each other; That problem is derived from the pressure regulation instruction issuing is in one's hands/and electronicly finish pressure regulation and need the time, the former is different because of the quick level of people's reaction, the latter obeys newton law of inertia, and the implementation of the supply frequency of 50HZ (zero point to current peak frequency of equal value is 200HZ), hand/electronic pressure regulation seriously lags behind relatively--tap changing time of pressure regulation actuator even 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.
The current peak time point of residual current is related to the accuracy of detection of break-time index, and the exploration of industry Jing Guo Long phase is reached common understanding: the time starting point of release actuator action is first peak value of residual current; What something lost was shaken is the simple solution of still not having effective detection residual current time to peak point so far.
Therefore, the detection supply unit that load voltage is adjustable, residual current is adjustable is demanded urgently improving and is improved.The present invention is intended to fill this class.At present, even include other detection system supply unit similar to earth leakage protective device detection system supply unit, disclosed intellectual property achievement is still few, and most intellectual properties focuses on earth leakage protective device but not the detection system of earth leakage protective device; Relevant knowledge property right achievement at " the detection supply unit that load voltage is adjustable, residual current is adjustable " is blank substantially.More representational relevant knowledge property right achievement is summarized 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 " based on the surge protector detecting device of temperature sensor " (application number 200910067800.4); proposition is based on the surge protector detecting device of temperature sensor; detect the surge suppression device temperature, analyze and draw the characteristic that this time flows through electric current and the state information of device of surge protector.
Patent of invention " overcurrent protector checkout gear " (application number 201010213928.X); a kind of overcurrent protector checkout gear is proposed; the secondary coil of transformer connects rectifier; the output parallel connection direct voltmeter 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 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 protective circuit.
Above-mentioned benefiting our pursuits proposed system architecture and the detection method of protector detection system, and certain reference value is arranged, and still has limitation but explore achievement; Therefore; be necessary to base oneself upon existing protector detection system and method; deep research and innovation are done in basis in existing achievement in research; transform the detection power supply of earth leakage protective device detection system with digital technology: the digital electric source apparatus of exploitation earth leakage protective device detection system--abandon mechanical contact-type pressure regulation actuator; adopt electronics non-contact type pressure regulation actuator--solid-state relay SSA; give up the simulation slide-wire potentiometer and transfer the stream method; transfer stream by T type resistor network, and propose a kind of technology 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 electric source apparatus of earth leakage protective device detection system is provided.
The digital electric source apparatus of earth leakage protective device detection system comprises transformer, the voltage regulator of SSA array, load current detection module, SSA array residual current T type accent flow module, the residual current peak detection block that secondary is made of 18 taps of 9 windings, the digital electric source apparatus is served the earth leakage protective device of configuration earth leakage protective device load, is controlled by sampling processing and control module;
Civil power, the transformer secondary that the former edge joint of transformer is gone into 220V links to each other with the SSA array and constitutes the voltage regulator of SSA array, the output of the voltage regulator of SSA array links to each other with earth leakage protective device, earth leakage protective device load in turn, and the voltage regulator of SSA array is implemented 1 control of SSA array by being controlled by sampling processing and control module;
Live wire, the zero line of the voltage regulator output of SSA array pass from the Hall current sensor of load current detection module, the signal that Hall current sensor is gathered through the load current circuit, generate the load current interrupt requests to sampling processing and control module, switch, be the commencing signal of SSA array 1 control of the voltage regulator of SSA array as the voltage regulator of SSA array;
The live wire of earth leakage protective device output transfers flow module, residual current peak detection block to link to each other with ground protection end or the zero line of the voltage regulator of SSA array through SSA array residual current T type, and SSA array residual current T type transfers flow module to implement 2 controls of SSA array by sampling processing and control module; The live wire of the voltage regulator output of SSA array passes from the Hall current sensor of residual current peak detection block, the signal that Hall current sensor is gathered holds resistance and current over-zero testing circuit, generates residual current peak value interrupt requests to sampling processing and control module through high pass, the time starting point of moving as the earth leakage protective device release, is the time starting point of break-time index;
Residual current peak detection block, load current detection module are all set up by magnetic field and are connected with the round about circuit of detection system; The digital electric source apparatus is to sampling processing and control module output residual current peak value interrupt requests, the load current interrupt request singal, SSA array 1 control that digital electric source apparatus execution sampling processing and control module (1000) are assigned, the instruction of SSA array 2 controls, sampling processing and control module (1000) are to " residual current peak value interrupt requests " in the testing process, " load current interrupt requests " closed and interrupted, during detection break-time index that and if only if, open " residual current peak value interrupt requests ", when the voltage regulator (200) of and if only if SSA array starts the pressure regulation process, open " load current interrupt requests ".
Described SSA array voltage regulator (200) is made up of secondary and the SSA array of transformer (100), transformer (100) secondary in regular turn by 0.5,1,2,4,8,16,32,64,128V amounts to 9 windings and constitutes, the SSA array comprises that 18 SSA, per 2 SSA are 9 groups of combination meters;
The connection relationship of SSA group is as follows: be subordinate to an end parallel connection of 2 SSA outputs of one group, the other end of one of them SSA output links to each other with first tap that cooperates winding, and the other end of another SSA output links to each other with second tap that cooperates winding; Connection relationship is as follows between winding: the following tap of last winding links to each other with the SSA group parallel connected end that back one winding cooperates;
The SSA array is implemented 1 control of SSA array by sampling processing and control module (1000): sampling processing links to each other with the input control end of SSA211, SSA221, SSA231, SSA241, SSA251, SSA261, SSA271, SSA281, SSA291 respectively with 9 IO control lines of the middle MCU of control module (1000), and 9 IO control lines all link to each other with the input control end of SSA212, SSA222, SSA232, SSA242, SSA252, SSA262, SSA272, SSA282, SSA292 respectively behind inverter; Therefore, two SSA states of SSA group: one logical one is disconnected or one disconnected one logical; Range of regulation 0～255.5V, the precision 0.5V of the voltage regulator of SSA array (200).
Described load current detection module (300) comprises Hall current sensor (310), the first amplifier LM124(320), the one 2 photoelectrical coupler PC817(330), the first inverter 74HC04(340); Live wire, the zero line of the voltage regulator of SSA array (200) output pass from the Hall current sensor of load current detection module (300), the output OUT of Hall current sensor end and the first amplifier LM124(320) in-phase input end pin 3 link to each other, the first amplifier LM124(320) inverting input pin 2 and the first amplifier LM124(320) output pin 1 link to each other and constitute voltage follower, an end of resistance R 311 links to each other with the OUT of Hall current sensor end, the other end ground connection of resistance R 311; The one 2 photoelectrical coupler PC817(330) input reverse parallel connection, the one 2 photoelectrical coupler PC817(330) end and the first amplifier LM124(320) output pin 1 link to each other, the one 2 photoelectrical coupler PC817(330) other end ground connection, the one 2 photoelectrical coupler PC817(330) collector output parallel connection, and with the first inverter 74HC04(340) input link to each other, the one 2 photoelectrical coupler PC817(330) emitter output ground connection in parallel, an end of resistance R 331 and the one 2 photoelectrical coupler PC817(330) collector output link to each other, another termination VCC of resistance R 331; The first inverter 74HC04(340) output is as the interrupt request singal of load current, the time that namely voltage regulator of SSA array (200) switches, SSA array 1 control signal issues; At the positive-negative half-cycle of AC power, the one 2 photoelectrical coupler PC817(330) conducting respectively, voltage be output as low level, moment, the one 2 photoelectrical coupler PC817(330 in the sinusoidal wave zero passage of AC power) all not conductings, voltage be output as high level, this voltage pulse signal is through the first inverter 74HC04(340) shaping, as the interrupt request singal of load current to sampling processing and control module (1000).
Described SSA array residual current T type transfers flow module (400) to be made up of T type resistor network (410) and SSA array (420), T type resistor network comprises that 7 resistances are that the resistance of R, 9 resistances are the resistance of 2R, totally 16 resistance, and the SSA array comprises 16 solid-state relay SSR, two one group totally 8 groups;
A road of earth leakage protective device (600) output links to each other, is used for earth leakage protective device with the earth leakage protective device load band carries detection, and flow with the accent that T type resistor network links to each other, carries out the earth leakage protective device residual current on another road of earth leakage protective device output;
The annexation of 18 resistance of T type resistor network is as follows: after the resistance series connection that 7 resistances are R, the resistance that the live wire of one end and earth leakage protective device output links to each other, the other end and 1 resistance the are 2R back ground connection of connect, an end of 8 resistance 2R resistance of remainder is corresponding continuous one by one with 8 end points of 7 R resistance of connecting respectively; The electric current of T type resistor network has: i
8=2
1* i
7=2
2* i
6=2
3* i
5=2
4* i
4=2
5* i
3=2
7* i
2=2
8* i
1Rule, namely resolution is 1/511i
MAX
The annexation of 16 solid-state relay SSR of SSA array is as follows: be subordinate to two SSR of one group the first output parallel connection, and link to each other second output of two SSR on the same group correspondingly with the other end of 8 resistance 2R resistance: SSR connecting to neutral line, another SSR be earth connection then;
The SSA array is implemented 2 controls of SSA array by sampling processing and control module (1000): in sampling processing and the control module (1000) 8 IO control lines of MCU respectively with S
8 zero, S
7 zero...., S
2 zero, S
1 zeroThe input control end link to each other, 8 IO control lines all behind inverter respectively with S
8 ground, S
7 ground...., S
2 ground, S
1 groundThe input control end link to each other so two SSA states of SSA group: one logical one is disconnected or one disconnected one logical.
Described residual current peak detection block (500) comprises second Hall current sensor (510), the second amplifier LM124(520), high pass holds resistance circuit (530), the 22 photoelectrical coupler PC817(540), the second inverter 74HC04(550), high pass is held resistance circuit by capacitor C
531, resistance R
531Form;
The live wire of earth leakage protective device (600) output passes from the Hall current sensor (510) of residual current peak detection block (500); the output OUT of Hall current sensor end and the second amplifier LM124(520) in-phase input end pin 3 link to each other; the second amplifier LM124(520) inverting input pin 2 and the second amplifier LM124(520) output pin 1 link to each other and constitute voltage follower, resistance R
511An end link to each other with the in-phase input end pin 3 of second amplifier, resistance R
511Other end ground connection; The second amplifier LM124(520) output pin 1 and capacitor C
531One end links to each other, capacitor C
531The other end be divided into two-way: the first via and resistance R
531The back ground connection that links to each other, the second tunnel with the 22 photoelectrical coupler PC817((540 of input reverse parallel connection)) link to each other; The 22 photoelectrical coupler PC817((540)) collector output parallel connection also links to each other the 22 photoelectrical coupler PC817((540 with the input of second inverter)) emitter output ground connection in parallel, resistance R
541An end link to each other, hinder R with the collector output of photoelectrical coupler
541Another termination V
CCThe second inverter 74HC04(550) output is as the interrupt request singal of residual current peak value, determine the action of earth leakage protective device release the time starting point, be the time starting point of break-time index; The second amplifier LM124(520) pin 1 output is that residual current detection signal, the high pass of earth leakage protective device held resistance circuit residual current detection signal peak point is become zero point, is that the detection of residual current peak value changes high pass into and holds the detection at zero point of resistance circuit output current; Positive-negative half-cycle, the 22 photoelectrical coupler PC817((540 of holding the resistance circuit output current in high pass)) conducting respectively, voltage be output as low level; moment, the 22 photoelectrical coupler PC817((540 of holding resistance circuit output current zero passage in high pass)) all not conductings, voltage be output as high level, this voltage pulse signal is through the second inverter 74HC04(550) shaping, as the interrupt request singal of earth leakage protective device release starting point operate time to sampling processing and control module (1000).
The present invention compares with background technology, the beneficial effect that has is: adopt SSA electronics non-contact type pressure regulation actuator to replace mechanical contact-type pressure regulation actuator, carry out the current zero-crossing point pressure regulation of digital electric source apparatus, eliminated the unavoidable arc erosion tap of traditional voltage-regulating technique phenomenon, overcome that the contact type voltage regulator automatization level is low, shortcomings such as low precision, response speed are slow, complex structure; Realize that by T type resistor network and SSA array the digitlization accent of earth leakage protective device residual current flows, and has solved the simulation slide-wire potentiometer and has transferred 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, the high pass that proposes detection residual current time to peak point is held the resistance detection scheme--and detect problem the zero point of residual current peak value detection problem being changed into high pass appearance 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 take place for the circuit at testing circuit and electric current to be measured place, so detection does not influence the circuit parameter at electric current to be measured place, help the raising of accuracy of detection.
Description of drawings
Fig. 1 is the earth leakage protective device detection system block diagram with digital electric source apparatus;
Fig. 2 is the voltage regulator schematic diagram of SSA array;
Fig. 3 is the circuit diagram of load current detection module;
Fig. 4 is that the residual current T type of SSA array is transferred the flow module circuit diagram;
Fig. 5 is the circuit diagram of residual current peak detection block.
Embodiment
Earth leakage protective device can be divided into by number of poles and the current circuit number of main switch: one pole two wires/two utmost points/two utmost points, three lines/three utmost points/three utmost points, four lines and four utmost point earth leakage protective devices; Commonly one pole two wires earth leakage protective device and three utmost points, 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 points, four line Lou electric protection Qi And do not have substantial difference; Consider the terseness of description, the present invention only launches to discuss with regard to the digital electric source apparatus of one pole two wires earth leakage protective device detection system; Dummy suffix notation explanation: solid-state relay (Solid State Relay) abbreviation SSR.
As shown in Figure 1, the digital electric source apparatus of earth leakage protective device detection system comprises transformer 100, the voltage regulator 200 of SSA array, load current detection module 300, SSA array residual current T type accent flow module 400, the residual current peak detection block 500 that secondary is made of 18 taps of 9 windings, the digital electric source apparatus is served the earth leakage protective device 600 of configuration earth leakage protective device load 700, is controlled by sampling processing and control module 1000;
Civil power, the transformer secondary that the former edge joint of transformer is gone into 220V links to each other with the SSA array and constitutes the voltage regulator 200 of SSA array, the output of the voltage regulator 200 of SSA array links to each other with earth leakage protective device 600, earth leakage protective device load 700 in turn, and the voltage regulator 200 of SSA array is implemented 1 control of SSA array by being controlled by sampling processing and control module 1000;
Live wire, the zero line of voltage regulator 200 outputs of SSA array pass from the Hall current sensor of load current detection module 300, the signal that Hall current sensor is gathered through load current circuit 800, generate the load current interrupt requests to sampling processing and control module 1000, switch, be the commencing signal of SSA array 1 control of the voltage regulator 200 of SSA array as the voltage regulator 200 of SSA array;
The live wire of earth leakage protective device 600 outputs transfers flow module 400, residual current peak detection block 500 to link to each other with ground protection end or the zero line of the voltage regulator 200 of SSA array through SSA array residual current T type, and SSA array residual current T type transfers flow module 400 to implement 2 controls of SSA array by sampling processing and control module 1000; The live wire of voltage regulator 200 outputs of SSA array passes from the Hall current sensor of residual current peak detection block 500, Hall current sensor gather signal a road through signal conditioning circuit to control module, obtain the residual electricity flow valuve of earth leakage protective device, another road that Hall current sensor is gathered signal holds resistance and current over-zero testing circuit, generates residual current peak value interrupt requests to sampling processing and control module 1000 through high pass, the time starting point of moving as the earth leakage protective device release, is the time starting point of break-time index;
Residual current peak detection block 500 is all set up by magnetic field with residual current detection module, load current detection module 300 and load current detection module and is connected with the round about circuit of detection system, and Gu Tuzhong dots; The digital electric source apparatus is to sampling processing and control module 1000 output residual current peak value interrupt requests; the load current interrupt request singal; control module is obtained the residual electricity flow valuve of earth leakage protective device by residual current detection module and load current detection module; the band set current value of earth leakage protective device; SSA array 1 control that digital electric source apparatus execution sampling processing and control module 1000 are assigned; the instruction of SSA array 2 controls; sampling processing and control module 1000 are to " residual current peak value interrupt requests " in the testing process; " load current interrupt requests " closed and interrupted; during detection break-time index that and if only if; open " residual current peak value interrupt requests ", when the voltage regulator 200 of and if only if SSA array starts the pressure regulation processes; open " load current interrupt requests ".
As shown in Figure 2, described SSA array voltage regulator 200 is made up of secondary and the SSA array of transformer 100, transformer 100 secondary in regular turn by 0.5,1,2,4,8,16,32,64,128V amounts to 9 windings and constitutes, the SSA array comprises that 18 JG53F type SSA, per 2 SSA are 9 groups of combination meters;
The connection relationship of SSA group is as follows: be subordinate to an end parallel connection of 2 SSA outputs of one group, the other end of one of them SSA output links to each other with first tap that cooperates winding, and the other end of another SSA output links to each other with second tap that cooperates winding; Being example with the 0.5V winding, SSA(211) with SSA(212) end of output is in parallel, and SSA(211) Shu Chu the other end links to each other with the last tap of 0.5V winding, and SSA(212) Shu Chu the other end links to each other with the following tap of 0.5V winding; Connection relationship is as follows between winding: the following tap of last winding links to each other with the SSA group parallel connected end that back one winding cooperates; Be example with the 0.5V winding, the SSA(221 that the following tap of 0.5V winding and 1V winding cooperate), SSA(222) the output-parallel end links to each other;
The SSA array is implemented 1 control of SSA arrays by sampling processing and control module 1000: 9 IO control lines of MCU link to each other with the input control end of SSA211, SSA221, SSA231, SSA241, SSA251, SSA261, SSA271, SSA281, SSA291 respectively in sampling processing and the control module 1000, and 9 IO control lines all link to each other with the input control end of SSA212, SSA222, SSA232, SSA242, SSA252, SSA262, SSA272, SSA282, SSA292 respectively behind inverter; Therefore, two SSA states of SSA group: one logical one is disconnected or one disconnected one logical; Range of regulation 0～255.5V, the precision 0.5V of the voltage regulator of SSA array (200).In view of SSA(2N1) and SSA(2N2) anti-phase, so just list SSA(2N1 in the table) state value, N=1,2,3,4,5,6,7,8,9; SSA state value=1/0, represent the two ends on/off of SSA output, the pressure regulation value V of the SSA state of SSA array and output respectively
0Corresponding relation see the following form.
As shown in Figure 3, described load current detection module 300 comprises Hall current sensor 310, the first amplifier LM124(320), the one 2 photoelectrical coupler PC817(330), the first inverter 74HC04(340); Live wire, the zero line of voltage regulator 200 outputs of SSA array pass from the Hall current sensor of load current detection module 300, the output OUT of Hall current sensor end and the first amplifier LM124(320) in-phase input end pin 3 link to each other, the first amplifier LM124(320) inverting input pin 2 and the first amplifier LM124(320) output pin 1 link to each other and constitute voltage follower, an end of resistance R 311 links to each other with the OUT of Hall current sensor end, the other end ground connection of resistance R 311; The one 2 photoelectrical coupler PC817(330) input reverse parallel connection, the one 2 photoelectrical coupler PC817(330) end and the first amplifier LM124(320) output pin 1 link to each other, the one 2 photoelectrical coupler PC817(330) other end ground connection, the one 2 photoelectrical coupler PC817(330) collector output parallel connection, and with the first inverter 74HC04(340) input link to each other, the one 2 photoelectrical coupler PC817(330) emitter output ground connection in parallel, an end of resistance R 331 and the one 2 photoelectrical coupler PC817(330) collector output link to each other, another termination VCC of resistance R 331; The first inverter 74HC04(340) output is as the interrupt request singal of load current, i.e. the time that voltage regulator 200 switches, SSA array 1 control signal issues of SSA array; At the positive-negative half-cycle of AC power, the one 2 photoelectrical coupler PC817(330) conducting respectively, voltage be output as low level, moment, the one 2 photoelectrical coupler PC817(330 in the sinusoidal wave zero passage of AC power) all not conductings, voltage be output as high level, this voltage pulse signal is through the first inverter 74HC04(340) shaping, as the interrupt request singal of load current to sampling processing and control module 1000.
As shown in Figure 4, described SSA array residual current T type transfers flow module 400 to be made up of T type resistor network 410 and SSA array 420, T type resistor network comprises that 7 resistances are that the resistance of R, 9 resistances are the resistance of 2R, totally 16 resistance, and the SSA array comprises 16 solid-state relay SSR, two one group totally 8 groups;
A road of earth leakage protective device 600 output links to each other, is used for earth leakage protective device with the earth leakage protective device load band carries detection, and flow with the accent that T type resistor network links to each other, carries out the earth leakage protective device residual current on another road of earth leakage protective device output;
The annexation of 18 resistance of T type resistor network is as follows: after the resistance series connection that 7 resistances are R, the resistance that the live wire of one end and earth leakage protective device output links to each other, the other end and 1 resistance the are 2R back ground connection of connect, an end of 8 resistance 2R resistance of remainder is corresponding continuous one by one with 8 end points of 7 R resistance of connecting respectively; The electric current of T type resistor network has: i
8=2
1* i
7=2
2* i
6=2
3* i
5=2
4* i
4=2
5* i
3=2
7* i
2=2
8* i
1Rule, namely resolution is 1/511i
MAX, i
MAXIt is the upper limit rated value that T type resistor network is transferred stream;
The annexation of 16 solid-state relay SSR of SSA array is as follows: be subordinate to two SSR of one group the first output parallel connection, and link to each other second output of two SSR on the same group correspondingly with the other end of 8 resistance 2R resistance: SSR connecting to neutral line, another SSR be earth connection then;
The annexation of 16 solid-state relay SSR of SSA array is as follows: be subordinate to two SSR of one group the first output parallel connection, and link to each other with the other end of 8 resistance 2R resistance correspondingly, second output of two SSR on the same group: SSR connecting to neutral line, another SSR be earth connection then, as two SSA of the 8th group, S
8 zeroConnecting to neutral line, S
8 groundEarth connection;
The SSA array is implemented 2 controls of SSA arrays by sampling processing and control module 1000: in sampling processing and the control module 1,000 8 IO control lines of MCU respectively with S
8 zero, S
7 zero...., S
2 zero, S
1 zeroThe input control end link to each other, 8 IO control lines all behind inverter respectively with S
8 ground, S
7 ground...., S
2 ground, S
1 groundThe input control end link to each other so two SSA states of SSA group: one logical one is disconnected or one disconnected one logical.
With i
8Be example, S
8 zeroLead to and S
8 groundDisconnected, i
8From live wire to 2R resistance, again from 2R resistance inflow zero line, the i of obvious this moment
8Be not residual current, just the earth leakage protective device load current extra current--the zero sequence current mutual inductor of earth leakage protective device detects the i of inflow
8With the i that refluxes
8Otherwise, S
8 zeroBreak and S
8 groundLogical, i
8From live wire to 2R resistance, again from 2R grounding through resistance, the i of this moment
8The zero sequence current mutual inductor of the earth leakage protective device that--is different from the load current of earth leakage protective device--though be residual current detects the i of inflow
8, but the i that refluxes
8Zero sequence current mutual inductor without zero line or earth leakage protective device.
As shown in Figure 5, described residual current peak detection block 500 comprises second Hall current sensor 510, the second amplifier LM124(520), high pass holds resistance circuit 530, the 22 photoelectrical coupler PC817(540), the second inverter 74HC04(550), high pass is held resistance circuit by capacitor C
531, resistance R
531Form;
The live wire of earth leakage protective device 600 outputs passes from the Hall current sensor 510 of residual current peak detection block 500; the output OUT of Hall current sensor end and the second amplifier LM124(520) in-phase input end pin 3 link to each other; the second amplifier LM124(520) inverting input pin 2 and the second amplifier LM124(520) output pin 1 link to each other and constitute voltage follower, resistance R
511An end link to each other with the in-phase input end pin 3 of second amplifier, resistance R
511Other end ground connection; The second amplifier LM124(520) output pin 1 and capacitor C
531One end links to each other, capacitor C
531The other end be divided into two-way: the first via and resistance R
531The back ground connection that links to each other, the second tunnel with the 22 photoelectrical coupler PC817((540 of input reverse parallel connection)) link to each other; The 22 photoelectrical coupler PC817((540)) collector output parallel connection also links to each other the 22 photoelectrical coupler PC817((540 with the input of second inverter)) emitter output ground connection in parallel, resistance R
541An end link to each other, hinder R with the collector output of photoelectrical coupler
541Another termination V
CCThe second inverter 74HC04(550) output is as the interrupt request singal of residual current peak value, determine the action of earth leakage protective device release the time starting point, be the time starting point of break-time index; The second amplifier LM124(520) pin 1 output is that residual current detection signal, the high pass of earth leakage protective device held resistance circuit residual current detection signal peak point is become zero point, is that the detection of residual current peak value changes high pass into and holds the detection at zero point of resistance circuit output current; Positive-negative half-cycle, the 22 photoelectrical coupler PC817((540 of holding the resistance circuit output current in high pass)) conducting respectively, voltage be output as low level; moment, the 22 photoelectrical coupler PC817((540 of holding resistance circuit output current zero passage in high pass)) all not conductings, voltage be output as high level, this voltage pulse signal is through the second inverter 74HC04(550) shaping, as the interrupt request singal of earth leakage protective device release starting point operate time to sampling processing and control module 1000.
Claims (5)
1. the digital electric source apparatus of an earth leakage protective device detection system, it is characterized in that transformer (100), the voltage regulator (200) of SSA array, load current detection module (300), SSA array residual current T type that the digital electric source apparatus comprises secondary and is made of 18 taps of 9 windings transfer flow module (400), residual current peak detection block (500), the digital electric source apparatus is served the earth leakage protective device (600) of configuration earth leakage protective device load (700), is controlled by sampling processing and control module (1000);
Civil power, the transformer secondary that the former edge joint of transformer is gone into 220V links to each other with the SSA array and constitutes the voltage regulator (200) of SSA array, the output of the voltage regulator of SSA array (200) links to each other with earth leakage protective device (600), earth leakage protective device load (700) in turn, and the voltage regulator of SSA array (200) is implemented 1 control of SSA array by being controlled by sampling processing and control module (1000);
Live wire, the zero line of the voltage regulator of SSA array (200) output pass from the Hall current sensor of load current detection module (300), the signal that Hall current sensor is gathered through load current circuit (800), generate the load current interrupt requests to sampling processing and control module (1000), switch, be the commencing signal of SSA array 1 control of the voltage regulator (200) of SSA array as the voltage regulator (200) of SSA array;
The live wire of earth leakage protective device (600) output transfers flow module (400), residual current peak detection block (500) to link to each other with ground protection end or the zero line of the voltage regulator (200) of SSA array through SSA array residual current T type, and SSA array residual current T type transfers flow module (400) to implement 2 controls of SSA array by sampling processing and control module (1000); The live wire of the voltage regulator of SSA array (200) output passes from the Hall current sensor of residual current peak detection block (500), the signal that Hall current sensor is gathered holds resistance and current over-zero testing circuit, generates residual current peak value interrupt requests to sampling processing and control module (1000) through high pass, the time starting point of moving as the earth leakage protective device release, is the time starting point of break-time index;
Residual current peak detection block (500), load current detection module (300) are all set up by magnetic field and are connected with the round about circuit of detection system; The digital electric source apparatus is to sampling processing and control module (1000) output residual current peak value interrupt requests, the load current interrupt request singal, SSA array 1 control that digital electric source apparatus execution sampling processing and control module (1000) are assigned, the instruction of SSA array 2 controls, sampling processing and control module (1000) are to " residual current peak value interrupt requests " in the testing process, " load current interrupt requests " closed and interrupted, during detection break-time index that and if only if, open " residual current peak value interrupt requests ", when the voltage regulator (200) of and if only if SSA array starts the pressure regulation process, open " load current interrupt requests ".
2. the digital electric source apparatus of a kind of earth leakage protective device detection system according to claim 1, it is characterized in that described SSA array voltage regulator (200) is made up of secondary and the SSA array of transformer (100), transformer (100) secondary in regular turn by 0.5,1,2,4,8,16,32,64,128V amounts to 9 windings and constitutes, the SSA array comprises that 18 SSA, per 2 SSA are 9 groups of combination meters;
The connection relationship of SSA group is as follows: be subordinate to an end parallel connection of 2 SSA outputs of one group, the other end of one of them SSA output links to each other with first tap that cooperates winding, and the other end of another SSA output links to each other with second tap that cooperates winding; Connection relationship is as follows between winding: the following tap of last winding links to each other with the SSA group parallel connected end that back one winding cooperates;
The SSA array is implemented 1 control of SSA array by sampling processing and control module (1000): sampling processing links to each other with the input control end of SSA211, SSA221, SSA231, SSA241, SSA251, SSA261, SSA271, SSA281, SSA291 respectively with 9 IO control lines of the middle MCU of control module (1000), and 9 IO control lines all link to each other with the input control end of SSA212, SSA222, SSA232, SSA242, SSA252, SSA262, SSA272, SSA282, SSA292 respectively behind inverter; Therefore, two SSA states of SSA group: one logical one is disconnected or one disconnected one logical; Range of regulation 0～the 255.5V of the voltage regulator of SSA array (200), precision 0.5 V.
3. the digital electric source apparatus of a kind of earth leakage protective device detection system according to claim 1 is characterized in that described load current detection module (300) comprises Hall current sensor (310), the first amplifier LM124(320), the one 2 photoelectrical coupler PC817(330), the first inverter 74HC04(340); Live wire, the zero line of the voltage regulator of SSA array (200) output pass from the Hall current sensor of load current detection module (300), the output OUT of Hall current sensor end and the first amplifier LM124(320) in-phase input end pin 3 link to each other, the first amplifier LM124(320) inverting input pin 2 and the first amplifier LM124(320) output pin 1 link to each other and constitute voltage follower, an end of resistance R 311 links to each other with the OUT of Hall current sensor end, the other end ground connection of resistance R 311; The one 2 photoelectrical coupler PC817(330) input reverse parallel connection, the one 2 photoelectrical coupler PC817(330) end and the first amplifier LM124(320) output pin 1 link to each other, the one 2 photoelectrical coupler PC817(330) other end ground connection, the one 2 photoelectrical coupler PC817(330) collector output parallel connection, and with the first inverter 74HC04(340) input link to each other, the one 2 photoelectrical coupler PC817(330) emitter output ground connection in parallel, an end of resistance R 331 and the one 2 photoelectrical coupler PC817(330) collector output link to each other, another termination VCC of resistance R 331; The first inverter 74HC04(340) output is as the interrupt request singal of load current, the time that namely voltage regulator of SSA array (200) switches, SSA array 1 control signal issues; At the positive-negative half-cycle of AC power, the one 2 photoelectrical coupler PC817(330) conducting respectively, voltage be output as low level, moment, the one 2 photoelectrical coupler PC817(330 in the sinusoidal wave zero passage of AC power) all not conductings, voltage be output as high level, this voltage pulse signal is through the first inverter 74HC04(340) shaping, as the interrupt request singal of load current to sampling processing and control module (1000).
4. the digital electric source apparatus of a kind of earth leakage protective device detection system according to claim 1, it is characterized in that described SSA array residual current T type transfers flow module (400) to be made up of T type resistor network (410) and SSA array (420), T type resistor network comprises that 7 resistances are that the resistance of R, 9 resistances are the resistance of 2R, totally 16 resistance, and the SSA array comprises 16 solid-state relay SSR, two one group totally 8 groups;
A road of earth leakage protective device (600) output links to each other, is used for earth leakage protective device with the earth leakage protective device load band carries detection, and flow with the accent that T type resistor network links to each other, carries out the earth leakage protective device residual current on another road of earth leakage protective device output;
The annexation of 18 resistance of T type resistor network is as follows: after the resistance series connection that 7 resistances are R, the resistance that the live wire of one end and earth leakage protective device output links to each other, the other end and 1 resistance the are 2R back ground connection of connect, an end of 8 resistance 2R resistance of remainder is corresponding continuous one by one with 8 end points of 7 R resistance of connecting respectively; The electric current of T type resistor network has: i
8=2
1* i
7=2
2* i
6=2
3* i
5=2
4* i
4=2
5* i
3=2
7* i
2=2
8* i
1Rule, namely resolution is 1/511 i
MAX
The annexation of 16 solid-state relay SSR of SSA array is as follows: be subordinate to two SSR of one group the first output parallel connection, and link to each other second output of two SSR on the same group correspondingly with the other end of 8 resistance 2R resistance: SSR connecting to neutral line, another SSR be earth connection then;
The SSA array is implemented 2 controls of SSA array by sampling processing and control module (1000): in sampling processing and the control module (1000) 8 IO control lines of MCU respectively with S
8 zero, S
7 zero...., S
2 zero, S
1 zeroThe input control end link to each other, 8 IO control lines all behind inverter respectively with S
8 ground, S
7 ground...., S
2 ground, S
1 groundThe input control end link to each other so two SSA states of SSA group: one logical one is disconnected or one disconnected one logical.
5. the digital electric source apparatus of a kind of earth leakage protective device detection system according to claim 1; it is characterized in that described residual current peak detection block (500) comprises second Hall current sensor (510), the second amplifier LM124(520), high pass holds resistance circuit (530), the 22 photoelectrical coupler PC817(540), the second inverter 74HC04(550), high pass is held resistance circuit by capacitor C
531, resistance R
531Form;
The live wire of earth leakage protective device (600) output passes from the Hall current sensor (510) of residual current peak detection block (500); the output OUT of Hall current sensor end and the second amplifier LM124(520) in-phase input end pin 3 link to each other; the second amplifier LM124(520) inverting input pin 2 and the second amplifier LM124(520) output pin 1 link to each other and constitute voltage follower, resistance R
511An end link to each other with the in-phase input end pin 3 of second amplifier, resistance R
511Other end ground connection; The second amplifier LM124(520) output pin 1 and capacitor C
531One end links to each other, capacitor C
531The other end be divided into two-way: the first via and resistance R
531The back ground connection that links to each other, the second tunnel with the 22 photoelectrical coupler PC817((540 of input reverse parallel connection)) link to each other; The 22 photoelectrical coupler PC817((540)) collector output parallel connection also links to each other the 22 photoelectrical coupler PC817((540 with the input of second inverter)) emitter output ground connection in parallel, resistance R
541An end link to each other, hinder R with the collector output of photoelectrical coupler
541Another termination V
CCThe second inverter 74HC04(550) output is as the interrupt request singal of residual current peak value, determine the action of earth leakage protective device release the time starting point, be the time starting point of break-time index; The second amplifier LM124(520) pin 1 output is that residual current detection signal, the high pass of earth leakage protective device held resistance circuit residual current detection signal peak point is become zero point, is that the detection of residual current peak value changes high pass into and holds the detection at zero point of resistance circuit output current; Positive-negative half-cycle, the 22 photoelectrical coupler PC817((540 of holding the resistance circuit output current in high pass)) conducting respectively, voltage be output as low level; moment, the 22 photoelectrical coupler PC817((540 of holding resistance circuit output current zero passage in high pass)) all not conductings, voltage be output as high level, this voltage pulse signal is through the second inverter 74HC04(550) shaping, as the interrupt request singal of earth leakage protective device release starting point operate time to sampling processing and control module (1000).
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| CN103487699A (en) * | 2013-09-25 | 2014-01-01 | 浙江大学 | Digital detecting system for leakage protector and high-precision detecting method |
| CN105071472A (en) * | 2015-08-11 | 2015-11-18 | 成都亿信标准认证集团有限公司 | Project management cloud service system having electric leakage protection function |
| CN106932717A (en) * | 2016-08-31 | 2017-07-07 | 中山市开普电器有限公司 | A kind of earth leakage protective device comprehensive test device |
| CN114089073A (en) * | 2021-11-22 | 2022-02-25 | 江苏兴宙微电子有限公司 | Leakage detection device and leakage detection method |
| CN117949718A (en) * | 2024-03-25 | 2024-04-30 | 杭州海康威视数字技术股份有限公司 | Voltage detection system, method and device |
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| CN114089073A (en) * | 2021-11-22 | 2022-02-25 | 江苏兴宙微电子有限公司 | Leakage detection device and leakage detection method |
| CN117949718A (en) * | 2024-03-25 | 2024-04-30 | 杭州海康威视数字技术股份有限公司 | Voltage detection system, method and device |
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