CN103280980B - 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
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 a kind of effectively prevent electric shock from hurting sb.'s feelings, the device that leakage fire, electric equipment damage.RCD is called for short residual current operated protective device, and the called after earth leakage protective device of China and Japan, appellation electric leakage earthing breaker (ELCB) in Europe, 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 at the reduction person and play huge effectiveness in leakage fire.1912, German 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 90% of continent total output; Term earth leakage protective device is conceived to the function or the usefulness that characterize protector; and term residual current operated protective device lay particular emphasis on characterize protector technical characteristic, be namely different from early stage voltage operation type technical characteristic, therefore 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 parts, intermediate link and 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 process voltage or power signal; Release actuator controls by intermediate link, maintains or cuts off protected main circuit power.Residual operating current value, electric leakage non-operating current value and break-time evaluate the most important three technology index of earth leakage protective device; Effective acquisition is earth leakage protective device technical indicator accurately, depends 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 Tiao Liu actuator of residual current; 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.
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 German Bei Han company 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 large, and testing process is complicated; The record of testing result, the processing of record all by manually completing, automation and intelligentification level is low, less reliable; Testing staff must possess higher technological literacy simultaneously, moreover single equipment there is no whole test items that method completes residual current operated protective device function.The domestic producer being engaged in earth leakage protective device detection system (instrument) is limited, the R&D institution such as research institute, colleges and universities very few especially, therefore the technological progress of earth leakage protective device detection system (instrument) is relatively slow; For colleges and universities, except north, river, the research and development that the Long phase is absorbed in earth leakage protective device and earth leakage protective device detection system (instrument) are learned by work sparetime university, and Jin You units colleges and universities 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 by contact type voltage regulator the voltage detecting power supply, the method that namely switched by transformer tapping realizes pressure regulation, the contribution of Hebei University of Technology substitutes early stage manual voltage regulation with electronic pressure regulation; But electronic pressure regulation cannot eliminate the arc phenomenon in tap changing process, the tap ablation defect that electric arc causes still exists; In addition, the regulation precision of contact type voltage regulator is low, response speed slow, complex structure, maintenance work amount are large.
Follow the traditional regulation method of analog variable resistance, carry out the tune stream of residual current; Analog variable resistance hinders the automation (automation of detected parameters and testing process) of detection system, and analog variable resistance adjusts the energy consumption of stream method also considerable simultaneously.
The current zero-crossing point of detection system supply unit is the optimum time point of pressure regulation, although the etection theory of current zero-crossing point is perfect, the result of engineering practice is far from each other; Problem is derived from pressure regulation instruction issuing in one's handsly/electronic to be completed pressure regulation and needs the time, the former is different because of the quick level of person's development, the latter obeys newton law of inertia, and the supply frequency (zero point to current peak frequency of equal value is 200HZ) of relative 50HZ, the implementation of hand/electronic pressure regulation are seriously delayed--and the tap changing time of pressure regulation actuator 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 so perfect.
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 there is no the simple solution effectively detecting residual current time to peak point so far.
Therefore, the detection supply unit that load voltage is adjustable, residual current is adjustable urgently improves raising.The present invention is intended to fill this class.At present, even if 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 for " the detection supply unit that load voltage is adjustable, residual current is adjustable " 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, amplifying the electric parameter at protector two ends, differentiate 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; detect surge suppression device temperature, analysis draws this time flows through the characteristic of electric current and the state information of device of surge protector.
Patent of invention " detecting device for overcurrent protector " (application number 201010213928.X); a kind of detecting device for overcurrent protector is proposed; the secondary coil of transformer connects rectifier; the output parallel connection direct voltmeter of rectifier, 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 comprises parts and the custom circuit of the protectors such as protector, zero-sequence transformer, dropout shunt opening coil, residual current treatment circuit, rectification circuit, controllable silicon SCR, also comprises self diagnosis indicating circuit and/or self diagnosis warning circuit and/or self diagnosis protective circuit.
Above-mentionedly to benefit our pursuits, propose system architecture and the detection method of protector detection system, have certain reference value, but explore achievement and still there is limitation, therefore, be necessary to base oneself upon existing protector detection system and method, deep research and innovation are done in the basis of existing achievement in research, detection power supply by digital technology transformation earth leakage protective device detection system: the digital electric source apparatus of exploitation earth leakage protective device detection system--abandon mechanical contact-type pressure regulation actuator, adopt electronic contactless formula pressure regulation actuator--solid-state relay SSA, give up simulation slide-wire potentiometer and adjust stream method, tune stream is carried out by T-shaped resistor network, and a kind of technology of effective detection residual current time to peak point is proposed--the high pass of residual current time to peak point holds resistance detection technique.
Summary of the invention
The object 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, the T-shaped tune flow module of SSA array residual current, the residual current peak detection block that secondary is made up of 9 winding 18 taps, digital electric source apparatus serves 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 of the former limit access 220V of transformer are connected with SSA array and form the voltage regulator of SSA array, the output of the voltage regulator of SSA array is connected with earth leakage protective device, earth leakage protective device load in turn, and the voltage regulator of SSA array is implemented SSA array 1 control 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 gathers is through load current circuit, generation load current interrupt requests to sampling processing and control module, and the voltage regulator as SSA array switches, i.e. the commencing signal of SSA array 1 control of the voltage regulator of SSA array;
The live wire that earth leakage protective device exports is connected through the ground protection end of the T-shaped tune flow module of SSA array residual current, residual current peak detection block and the voltage regulator of SSA array or zero line, and the T-shaped tune flow module of SSA array residual current is controlled by sampling processing and control module enforcement SSA array 2; The live wire that the voltage regulator of SSA array exports passes from the Hall current sensor of residual current peak detection block, the signal that Hall current sensor gathers holds resistance and current over-zero testing circuit through high pass, generates residual current peak value interrupt requests to sampling processing and control module, as the time starting point of the time starting point of earth leakage protective device release action, i.e. 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, digital electric source apparatus exports residual current peak value interrupt requests to sampling processing and control module, load current interrupt request singal, the SSA array 1 that digital electric source apparatus execution sampling processing and control module (1000) are assigned controls, the instruction that SSA array 2 controls, in testing process, sampling processing and control module (1000) are to " residual current peak value interrupt requests ", " load current interrupt requests " is closed and is 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 pressure regulation process, open " load current interrupt requests ".
Described SSA array voltage regulator (200) is made up of the secondary of transformer (100) and SSA array, transformer (100) secondary sequentially by 0.5,1,2,4,8,16,32,64,128V amounts to 9 windings and forms, SSA array comprises 18 SSA, every 2 SSA are that a combination counts 9 groups;
The connection relationship of SSA group is as follows: one end that 2 SSA being subordinate to a group export is in parallel, and the other end that one of them SSA exports is connected with coordinating first tap of winding, and the other end that another SSA exports is connected with coordinating second tap of winding; Between winding, connection relationship is as follows: the SSA group parallel connected end that lower tap and a rear winding of last winding coordinate is connected;
SSA array is implemented SSA array 1 by sampling processing and control module (1000) and is controlled: sampling processing is connected with the input control end of SSA211, SSA221, SSA231, SSA241, SSA251, SSA261, SSA271, SSA281, SSA291 respectively with 9 IO control lines of MCU in control module (1000), and 9 IO control lines are all connected with the input control end of SSA212, SSA222, SSA232, SSA242, SSA252, SSA262, SSA272, SSA282, SSA292 respectively after inverter; Therefore, two SSA states of SSA group: logical is disconnected or disconnected to lead to; Range of regulation 0 ~ 255.5V, the precision 0.5V of the voltage regulator (200) of SSA array.
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), the live wire that the voltage regulator (200) of SSA array exports, zero line pass from the Hall current sensor of load current detection module (300), the output OUT of Hall current sensor holds and the first amplifier LM124(320) in-phase input end pin 3 be connected, first amplifier LM124(320) inverting input pin 2 and the first amplifier LM124(320) output pin 1 be connected and form voltage follower, one end of resistance R311 hold with the OUT of Hall current sensor be connected, the other end ground connection of resistance R311, one 2 photoelectrical coupler PC817(330) input reverse parallel connection, one 2 photoelectrical coupler PC817(330) one end and the first amplifier LM124(320) output pin 1 be connected, one 2 photoelectrical coupler PC817(330) other end ground connection, one 2 photoelectrical coupler PC817(330) collector output in parallel, and with the first inverter 74HC04(340) input be connected, one 2 photoelectrical coupler PC817(330) emitter output earth, one end and the one 2 the photoelectrical coupler PC817(330 of resistance R331) collector output be connected, another termination VCC of resistance R331, first inverter 74HC04(340) output 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, positive-negative half-cycle, the one 2 photoelectrical coupler PC817(330 in AC power) respectively conducting, voltage exports as low level, moment, the one 2 photoelectrical coupler PC817(330 in the sinusoidal wave zero passage of AC power) all not conductings, voltage exports 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-shaped tune flow module (400) is made up of T-shaped resistor network (410) and SSA array (420), T-shaped resistor network comprises the resistance that 7 resistances are R, 9 resistances are 2R resistance, totally 16 resistance, SSA array comprise 16 solid-state relay SSR, two one group totally 8 groups;
The road that earth leakage protective device (600) exports is connected with earth leakage protective device load, carry detection for the band of earth leakage protective device, and another road that earth leakage protective device exports is connected with T-shaped resistor network, carries out the tune stream of earth leakage protective device residual current;
The annexation of T-shaped resistor network 18 resistance is as follows: 7 resistances are after the resistant series of R, the live wire that one end exports with earth leakage protective device is connected, the other end and 1 resistance are ground connection after the resistant series of 2R, and connect with 7 respectively 8 end points one_to_one corresponding of R resistance of one end of 8 remaining resistance 2R resistance are connected; The electric current of T-shaped 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 SSA array 16 solid-state relay SSR is as follows: be subordinate to the first output parallel connection of two SSR of a group and be connected with the other end of 8 resistance 2R resistance correspondingly, the second output with group two SSR: SSR connecting to neutral line, another SSR then earth connection;
SSA array is implemented SSA array 2 by sampling processing and control module (1000) and is controlled: in sampling processing and control module (1000) 8 IO control lines of MCU respectively with S
8 zero, S
7 zero...., S
2 zero, S
1 zeroinput control end be connected, 8 IO control lines all after inverter respectively with S
8 ground, S
7 ground...., S
2 ground, S
1 groundinput control end be connected, therefore two SSA states of SSA group: logical is disconnected or disconnected to lead to.
Described residual current peak detection block (500) comprises the second Hall current sensor (510), the second amplifier LM124(520), high pass hold resistance circuit (530), the 22 photoelectrical coupler PC817(540), the second inverter 74HC04(550), high pass hold resistance circuit by electric capacity C
531, resistance R
531composition;
The live wire that earth leakage protective device (600) exports passes from the Hall current sensor (510) of residual current peak detection block (500); the output OUT of Hall current sensor holds and the second amplifier LM124(520) in-phase input end pin 3 be connected; second amplifier LM124(520) inverting input pin 2 and the second amplifier LM124(520) output pin 1 be connected and form voltage follower, resistance R
511one end be connected with the in-phase input end pin 3 of the second amplifier, resistance R
511other end ground connection; Second amplifier LM124(520) output pin 1 and electric capacity C
531one end is connected, electric capacity C
531the other end be divided into two-way: the first via and resistance R
531ground connection after being connected, the 22 photoelectrical coupler PC817((540 of the second tunnel and input reverse parallel connection)) be connected; 22 photoelectrical coupler PC817((540)) collector output in parallel and be connected with the input of the second inverter, the 22 photoelectrical coupler PC817((540)) emitter output earth, resistance R
541one end be connected with the collector output of photoelectrical coupler, hinder R
541another termination V
cC; Second inverter 74HC04(550) output as the interrupt request singal of residual current peak value, determine the time starting point of the time starting point of earth leakage protective device release action, i.e. break-time index; Second amplifier LM124(520) pin 1 exports is the residual current detection signal of earth leakage protective device, high pass is held resistance circuit and residual current detection signal peak value point become zero point, the i.e. detection of residual current peak value and change the detection that high pass holds resistance circuit output current zero point into; Positive-negative half-cycle, the 22 the photoelectrical coupler PC817((540 of resistance circuit output current is held in high pass)) conducting respectively, voltage exports as low level; hold moment, the 22 the photoelectrical coupler PC817((540 of resistance circuit output current zero passage in high pass)) all not conductings, voltage exports 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 is compared with background technology, the beneficial effect had is: adopt SSA electronic contactless formula 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, eliminate traditional voltage-regulating technique unavoidable arc erosion tap phenomenon, overcome the shortcomings such as contact type voltage regulator automatization level is low, low precision, response speed slow, complex structure; Stream is adjusted in the digitlization realizing earth leakage protective device residual current by T-shaped resistor network and SSA array, solves the difficult problems such as low precision that simulation slide-wire potentiometer adjusts stream method intrinsic, less reliable, automatization level are low; Give up the detection scheme of direct-detection residual current time to peak point, the high pass proposing to detect residual current time to peak point holds resistance detection scheme--and residual current peakvalue's checking problem is changed into the test problems at zero point that high pass holds resistance circuit output current, improve accuracy of detection and the real-time of current peak; Detect residual current and load current by Hall current sensor, because direct electrical communication does not occur the circuit at testing circuit and electric current place to be measured, so detect the circuit parameter not affecting electric current place to be measured, contribute to the raising of accuracy of detection.
Accompanying drawing explanation
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 the residual current T-shaped tune flow module circuit diagram of SSA array;
Fig. 5 is the circuit diagram of residual current peak detection block.
Embodiment
Earth leakage protective device can be divided into by the number of poles of main switch and current circuit number: one pole two wires/bis-pole/bis-pole three line/tri-pole/tri-pole four line and four pole earth leakage protective devices; 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 Lou electric protection Qi And are without 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 illustrates: abridge solid-state relay (Solid State Relay) 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, the T-shaped tune flow module 400 of SSA array residual current, the residual current peak detection block 500 that secondary is made up of 9 winding 18 taps, digital electric source apparatus serves 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 of the former limit access 220V of transformer are connected with SSA array and form the voltage regulator 200 of SSA array, the output of the voltage regulator 200 of SSA array is connected with earth leakage protective device 600, earth leakage protective device load 700 in turn, and the voltage regulator 200 of SSA array is implemented SSA array 1 control by being controlled by sampling processing and control module 1000;
Live wire, the zero line of voltage regulator 200 output of SSA array pass from the Hall current sensor of load current detection module 300, the signal that Hall current sensor gathers is through load current circuit 800, generation load current interrupt requests to sampling processing and control module 1000, and the voltage regulator 200 as SSA array switches, i.e. the commencing signal of SSA array 1 control of the voltage regulator 200 of SSA array;
The live wire that earth leakage protective device 600 exports is connected through the ground protection end of the T-shaped tune flow module 400 of SSA array residual current, residual current peak detection block 500 and the voltage regulator 200 of SSA array or zero line, and the T-shaped tune flow module 400 of SSA array residual current is implemented SSA array 2 by sampling processing and control module 1000 and controlled; The live wire that the voltage regulator 200 of SSA array exports passes from the Hall current sensor of residual current peak detection block 500, one tunnel of Hall current sensor collection signal through signal conditioning circuit to control module, the residual electricity flow valuve obtaining earth leakage protective device, another road of Hall current sensor collection signal holds resistance and current over-zero testing circuit through high pass, generates residual current peak value interrupt requests to sampling processing and control module 1000, as the time starting point of the time starting point of earth leakage protective device release action, i.e. break-time index;
Residual current peak detection block 500 and residual current detection module, load current detection module 300 and load current detection module are all set up by magnetic field and are connected with the round about circuit of detection system, and Gu Tuzhong is represented by dashed line, digital electric source apparatus exports residual current peak value interrupt requests to sampling processing and control module 1000, load current interrupt request singal, control module obtains 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, the SSA array 1 that digital electric source apparatus execution sampling processing and control module 1000 are assigned controls, the instruction that SSA array 2 controls, in testing process, sampling processing and control module 1000 are to " residual current peak value interrupt requests ", " load current interrupt requests " is closed and is 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 pressure regulation process, open " load current interrupt requests ".
As shown in Figure 2, described SSA array voltage regulator 200 is made up of the secondary of transformer 100 and SSA array, transformer 100 secondary sequentially by 0.5,1,2,4,8,16,32,64,128V amounts to 9 windings and forms, SSA array comprises 18 JG53F type SSA, every 2 SSA are that a combination counts 9 groups;
The connection relationship of SSA group is as follows: one end that 2 SSA being subordinate to a group export is in parallel, and the other end that one of them SSA exports is connected with coordinating first tap of winding, and the other end that another SSA exports is connected with coordinating second tap of winding; For 0.5V winding, SSA(211) with SSA(212) one end of exporting is in parallel, SSA(211) other end that exports is connected with the upper tap of 0.5V winding, SSA(212) other end that exports is connected with the lower tap of 0.5V winding; Between winding, connection relationship is as follows: the SSA group parallel connected end that lower tap and a rear winding of last winding coordinate is connected; For 0.5V winding, the SSA(221 that the lower tap of 0.5V winding coordinates with 1V winding), SSA(222) output-parallel end is connected;
SSA array is implemented SSA array 1 by sampling processing and control module 1000 and is controlled: sampling processing is connected with the input control end of SSA211, SSA221, SSA231, SSA241, SSA251, SSA261, SSA271, SSA281, SSA291 respectively with 9 IO control lines of MCU in control module 1000, and 9 IO control lines are all connected with the input control end of SSA212, SSA222, SSA232, SSA242, SSA252, SSA262, SSA272, SSA282, SSA292 respectively after inverter; Therefore, two SSA states of SSA group: logical is disconnected or disconnected to lead to; Range of regulation 0 ~ 255.5V, the precision 0.5V of the voltage regulator (200) of SSA array.In view of SSA(2N1) and SSA(2N2) anti-phase, therefore just list SSA(2N1 in table) state value, N=1,2,3,4,5,6,7,8,9; SSA state value=1/0, respectively represent SSA export two ends on/off, the SSA state of SSA array and the pressure regulation value V of output
0corresponding relation see the following form.
As shown in Figure 3, described load current detection module 300 comprises Hall current sensor 310, 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 output of SSA array pass from the Hall current sensor of load current detection module 300, the output OUT of Hall current sensor holds and the first amplifier LM124(320) in-phase input end pin 3 be connected, first amplifier LM124(320) inverting input pin 2 and the first amplifier LM124(320) output pin 1 be connected and form voltage follower, one end of resistance R311 hold with the OUT of Hall current sensor be connected, the other end ground connection of resistance R311, one 2 photoelectrical coupler PC817(330) input reverse parallel connection, one 2 photoelectrical coupler PC817(330) one end and the first amplifier LM124(320) output pin 1 be connected, one 2 photoelectrical coupler PC817(330) other end ground connection, one 2 photoelectrical coupler PC817(330) collector output in parallel, and with the first inverter 74HC04(340) input be connected, one 2 photoelectrical coupler PC817(330) emitter output earth, one end and the one 2 the photoelectrical coupler PC817(330 of resistance R331) collector output be connected, another termination VCC of resistance R331, first inverter 74HC04(340) output as the interrupt request singal of load current, the time that namely voltage regulator 200 of SSA array switches, SSA array 1 control signal issues, positive-negative half-cycle, the one 2 photoelectrical coupler PC817(330 in AC power) respectively conducting, voltage exports as low level, moment, the one 2 photoelectrical coupler PC817(330 in the sinusoidal wave zero passage of AC power) all not conductings, voltage exports 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-shaped tune flow module 400 is made up of T-shaped resistor network 410 and SSA array 420, T-shaped resistor network comprises the resistance that 7 resistances are R, 9 resistances are 2R resistance, totally 16 resistance, SSA array comprise 16 solid-state relay SSR, two one group totally 8 groups;
The road that earth leakage protective device 600 exports is connected with earth leakage protective device load, carry detection for the band of earth leakage protective device, and another road that earth leakage protective device exports is connected with T-shaped resistor network, carries out the tune stream of earth leakage protective device residual current;
The annexation of T-shaped resistor network 18 resistance is as follows: 7 resistances are after the resistant series of R, the live wire that one end exports with earth leakage protective device is connected, the other end and 1 resistance are ground connection after the resistant series of 2R, and connect with 7 respectively 8 end points one_to_one corresponding of R resistance of one end of 8 remaining resistance 2R resistance are connected; The electric current of T-shaped 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-shaped resistor network adjusts stream;
The annexation of SSA array 16 solid-state relay SSR is as follows: be subordinate to the first output parallel connection of two SSR of a group and be connected with the other end of 8 resistance 2R resistance correspondingly, the second output with group two SSR: SSR connecting to neutral line, another SSR then earth connection;
The annexation of SSA array 16 solid-state relay SSR is as follows: be subordinate to the first output parallel connection of two SSR of a group and be connected with the other end of 8 resistance 2R resistance correspondingly, the second output with group two SSR: SSR connecting to neutral line, another SSR then earth connection, as two SSA, the S of the 8th group
8 zeroconnecting to neutral line, S
8 groundearth connection;
SSA array is implemented SSA array 2 by sampling processing and control module 1000 and is controlled: in sampling processing and control module 1,000 8 IO control lines of MCU respectively with S
8 zero, S
7 zero...., S
2 zero, S
1 zeroinput control end be connected, 8 IO control lines all after inverter respectively with S
8 ground, S
7 ground...., S
2 ground, S
1 groundinput control end be connected, therefore two SSA states of SSA group: logical is disconnected or disconnected to lead to.
With i
8for example, S
8 zerolead to and S
8 grounddisconnected, i
8zero line, obvious i is now flowed into from 2R resistance from live wire to 2R resistance, again
8be not residual current, just 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 of backflow
8otherwise, S
8 zerobreak and S
8 groundlogical, i
8from live wire to 2R resistance, again from 2R grounding through resistance, i now
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 backflow i
8without the zero sequence current mutual inductor of zero line or earth leakage protective device.
As shown in Figure 5, described residual current peak detection block 500 comprises the second Hall current sensor 510, second amplifier LM124(520), high pass holds resistance circuit the 530, the 22 photoelectrical coupler PC817(540), the second inverter 74HC04(550), high pass holds resistance circuit by electric capacity C
531, resistance R
531composition;
The live wire that earth leakage protective device 600 exports passes from the Hall current sensor 510 of residual current peak detection block 500; the output OUT of Hall current sensor holds and the second amplifier LM124(520) in-phase input end pin 3 be connected; second amplifier LM124(520) inverting input pin 2 and the second amplifier LM124(520) output pin 1 be connected and form voltage follower, resistance R
511one end be connected with the in-phase input end pin 3 of the second amplifier, resistance R
511other end ground connection; Second amplifier LM124(520) output pin 1 and electric capacity C
531one end is connected, electric capacity C
531the other end be divided into two-way: the first via and resistance R
531ground connection after being connected, the 22 photoelectrical coupler PC817((540 of the second tunnel and input reverse parallel connection)) be connected; 22 photoelectrical coupler PC817((540)) collector output in parallel and be connected with the input of the second inverter, the 22 photoelectrical coupler PC817((540)) emitter output earth, resistance R
541one end be connected with the collector output of photoelectrical coupler, hinder R
541another termination V
cC; Second inverter 74HC04(550) output as the interrupt request singal of residual current peak value, determine the time starting point of the time starting point of earth leakage protective device release action, i.e. break-time index; Second amplifier LM124(520) pin 1 exports is the residual current detection signal of earth leakage protective device, high pass is held resistance circuit and residual current detection signal peak value point become zero point, the i.e. detection of residual current peak value and change the detection that high pass holds resistance circuit output current zero point into; Positive-negative half-cycle, the 22 the photoelectrical coupler PC817((540 of resistance circuit output current is held in high pass)) conducting respectively, voltage exports as low level; hold moment, the 22 the photoelectrical coupler PC817((540 of resistance circuit output current zero passage in high pass)) all not conductings, voltage exports 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 (2)
1. the digital electric source apparatus of an earth leakage protective device detection system, it is characterized in that transformer (100) that digital electric source apparatus comprises secondary and be made up of 9 winding 18 taps, the voltage regulator (200) of SSA array, load current detection module (300), the T-shaped tune flow module (400) of SSA array residual current, residual current peak detection block (500), digital electric source apparatus serves the earth leakage protective device (600) of configuration earth leakage protective device load (700), is controlled by sampling processing and control module (1000);
The civil power of the former limit access 220V of transformer, transformer secondary are connected with SSA array the voltage regulator (200) forming SSA array, the output of the voltage regulator (200) of SSA array is connected with earth leakage protective device (600), earth leakage protective device load (700) in turn, and the voltage regulator (200) of SSA array is implemented SSA array 1 control by being controlled by sampling processing and control module (1000);
The live wire that the voltage regulator (200) of SSA array exports, zero line pass from the Hall current sensor of load current detection module (300), the signal that Hall current sensor gathers is through load current detection module (300), generation load current interrupt requests to sampling processing and control module (1000), and the voltage regulator (200) as SSA array switches, i.e. the commencing signal of SSA array 1 control of the voltage regulator (200) of SSA array, the live wire that earth leakage protective device (600) exports is connected through the ground protection end of the T-shaped tune flow module (400) of SSA array residual current, residual current peak detection block (500) and the voltage regulator (200) of SSA array or zero line, and the T-shaped tune flow module (400) of SSA array residual current is implemented SSA array 2 by sampling processing and control module (1000) and controlled, the live wire that the voltage regulator (200) of SSA array exports passes from the Hall current sensor of residual current peak detection block (500), the signal that Hall current sensor gathers holds resistance and current over-zero testing circuit through high pass, generates residual current peak value interrupt requests to sampling processing and control module (1000), as the time starting point of the time starting point of earth leakage protective device release action, i.e. 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, digital electric source apparatus exports residual current peak value interrupt requests to sampling processing and control module (1000), load current interrupt request singal, the SSA array 1 that digital electric source apparatus execution sampling processing and control module (1000) are assigned controls, the instruction that SSA array 2 controls, in testing process, sampling processing and control module (1000) are to " residual current peak value interrupt requests ", " load current interrupt requests " is closed and is 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 pressure regulation process, open " load current interrupt requests ",
Described SSA array voltage regulator (200) is made up of the secondary of transformer (100) and SSA array, transformer (100) secondary sequentially by 0.5,1,2,4,8,16,32,64,128V amounts to 9 windings and forms, SSA array comprises 18 SSA, every 2 SSA are that a combination counts 9 groups; The connection relationship of SSA group is as follows: one end that 2 SSA being subordinate to a group export is in parallel, and the other end that one of them SSA exports is connected with coordinating first tap of winding, and the other end that another SSA exports is connected with coordinating second tap of winding; Between winding, connection relationship is as follows: the SSA group parallel connected end that lower tap and a rear winding of last winding coordinate is connected; SSA array is implemented SSA array 1 by sampling processing and control module (1000) and is controlled: sampling processing is connected with the input control end of SSA211, SSA221, SSA231, SSA241, SSA251, SSA261, SSA271, SSA281, SSA291 respectively with 9 IO control lines of MCU in control module (1000), and 9 IO control lines are all connected with the input control end of SSA212, SSA222, SSA232, SSA242, SSA252, SSA262, SSA272, SSA282, SSA292 respectively after inverter; Therefore, two SSA states of SSA group: logical is disconnected or disconnected to lead to; Range of regulation 0 ~ the 255.5V of the voltage regulator (200) of SSA array, precision 0.5 V;
Described SSA array residual current T-shaped tune flow module (400) is made up of T-shaped resistor network (410) and SSA array (420), T-shaped resistor network comprises the resistance that 7 resistances are R, 9 resistances are 2R resistance, totally 16 resistance, SSA array comprise 16 solid-state relay SSR, two one group totally 8 groups; The road that earth leakage protective device (600) exports is connected with earth leakage protective device load, carry detection for the band of earth leakage protective device, and another road that earth leakage protective device exports is connected with T-shaped resistor network, carries out the tune stream of earth leakage protective device residual current; The annexation of T-shaped resistor network 18 resistance is as follows: 7 resistances are after the resistant series of R, the live wire that one end exports with earth leakage protective device is connected, the other end and 1 resistance are ground connection after the resistant series of 2R, and connect with 7 respectively 8 end points one_to_one corresponding of R resistance of one end of 8 remaining resistance 2R resistance are connected; The electric current of T-shaped 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 SSA array 16 solid-state relay SSR is as follows: be subordinate to the first output parallel connection of two SSR of a group and be connected with the other end of 8 resistance 2R resistance correspondingly, the second output with group two SSR: SSR connecting to neutral line, another SSR then earth connection;
SSA array is implemented SSA array 2 by sampling processing and control module (1000) and is controlled: in sampling processing and control module (1000) 8 IO control lines of MCU respectively with S
8 zero, S
7 zero...., S
2 zero, S
1 zerozero line input control end be connected, 8 IO control lines all after inverter respectively with S
8 ground, S
7 ground...., S
2 ground, S
1 groundground wire input control end be connected, therefore two SSA states of SSA group: logical is disconnected or disconnected to lead to;
Described residual current peak detection block (500) comprises the second Hall current sensor (510), the second amplifier LM124(520), high pass hold resistance circuit (530), 2 the second photoelectrical coupler PC817(540), the second inverter 74HC04(550), high pass hold resistance circuit by electric capacity C
531, resistance R
531composition; The live wire that earth leakage protective device (600) exports passes from the Hall current sensor (510) of residual current peak detection block (500); the output OUT of Hall current sensor holds and the second amplifier LM124(520) in-phase input end pin 3 be connected; second amplifier LM124(520) inverting input pin 2 and the second amplifier LM124(520) output pin 1 be connected and form voltage follower, resistance R
511one end be connected with the in-phase input end pin 3 of the second amplifier, resistance R
511other end ground connection; Second amplifier LM124(520) output pin 1 and electric capacity C
531one end is connected, electric capacity C
531the other end be divided into two-way: the first via and resistance R
531ground connection after being connected, 2 the second photoelectrical coupler PC817(540 of the second tunnel and input reverse parallel connection) be connected; 2 the second photoelectrical coupler PC817(540) collector output in parallel and be connected with the input of the second inverter, 2 the second photoelectrical coupler PC817(540) emitter output earth, resistance R
541one end be connected with the collector output of photoelectrical coupler, resistance R
541another termination V
cC; Second inverter 74HC04(550) output as the interrupt request singal of residual current peak value, determine the time starting point of the time starting point of earth leakage protective device release action, i.e. break-time index; Second amplifier LM124(520) pin 1 exports is the residual current detection signal of earth leakage protective device, high pass is held resistance circuit and residual current detection signal peak value point become zero point, the i.e. detection of residual current peak value and change the detection that high pass holds resistance circuit output current zero point into; Positive-negative half-cycle, 2 second photoelectrical coupler PC817(540 of resistance circuit output current are held in high pass) conducting respectively, voltage exports as low level; hold moment, 2 second photoelectrical coupler PC817(540 of resistance circuit output current zero passage in high pass) all not conductings, voltage exports as high level, low level and high level are 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).
2. 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), 2 the first photoelectrical coupler PC817(330), the first inverter 74HC04(340), the live wire that the voltage regulator (200) of SSA array exports, zero line pass from the Hall current sensor of load current detection module (300), the output OUT of Hall current sensor holds and the first amplifier LM124(320) in-phase input end pin 3 be connected, first amplifier LM124(320) inverting input pin 2 and the first amplifier LM124(320) output pin 1 be connected and form voltage follower, one end of resistance R311 hold with the OUT of Hall current sensor be connected, the other end ground connection of resistance R311, 2 the first photoelectrical coupler PC817(330) input reverse parallel connection, 2 the first photoelectrical coupler PC817(330) one end and the first amplifier LM124(320) output pin 1 be connected, 2 the first photoelectrical coupler PC817(330) other end ground connection, 2 the first photoelectrical coupler PC817(330) collector output in parallel, and with the first inverter 74HC04(340) input be connected, 2 the first photoelectrical coupler PC817(330) emitter output earth, one end and 2 first photoelectrical coupler PC817(330 of resistance R331) collector output be connected, another termination VCC of resistance R331, first inverter 74HC04(340) output 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, positive-negative half-cycle, 2 the first photoelectrical coupler PC817(330 in AC power) respectively conducting, voltage exports as low level, moment, 2 the first photoelectrical coupler PC817(330 in the sinusoidal wave zero passage of AC power) all not conductings, voltage exports as high level, low level and high level are through the first inverter 74HC04(340) shaping, as the interrupt request singal of load current to sampling processing and control module (1000).
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| CN103487699B (en) * | 2013-09-25 | 2016-06-15 | 浙江大学 | The digital detection system of earth leakage protective device and high-precision detection 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 |
| CN106370965A (en) * | 2016-08-31 | 2017-02-01 | 中山市开普电器有限公司 | Integrated leakage protector 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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