CN103066579A - Grid fault measuring and control device - Google Patents
Grid fault measuring and control device Download PDFInfo
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- CN103066579A CN103066579A CN2012105673174A CN201210567317A CN103066579A CN 103066579 A CN103066579 A CN 103066579A CN 2012105673174 A CN2012105673174 A CN 2012105673174A CN 201210567317 A CN201210567317 A CN 201210567317A CN 103066579 A CN103066579 A CN 103066579A
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Abstract
The invention provides a grid fault measuring and control device and relates to the technical field of circuit protection. The grid fault measuring and control device is characterized by comprising a signal input end, a signal collecting and processing module, a first singlechip, a second singlechip, a third singlechip, and a fourth singlechip, wherein the signal collecting and processing module is connected with the back side of the signal input side in an electric mode, the first singlechip, the second singlechip, the third singlechip, and the fourth singlechip are connected with the back side of the signal collecting and processing module, and the fourth singlechip is connected with a controlling keyboard module, a 485 communication transmission module, a memory module, a liquid crystal display (LCD) module and an indicator light module. The grid fault measuring and control device is modularized in design, compact in structure, advanced in technology, and capable of guaranteeing instantaneity and accuracy of calculating through a high-speed digital signal processor (DSP) nuclear processor. A multi-master controller area network (CAN) bus communication with the functions of self error correction and self arbitration is adopted among all modules, mass data is exchanged and shared, and the grid fault measuring and control device has the function of fault remembering. Liquid crystal display in Chinese is achieved, and the grid fault measuring and control device is clear in running status, capable of operating in menu-type , and convenient and easy to use.
Description
Technical field:
The present invention relates to the circuit protection technical field, specifically the electric network fault measure and control device.
Background technology:
In the three-phase and four-line circuit, the phasor of three-phase current and equalling zero, i.e. Ia+Ib+IC=0.If current transformer of access in three-phase and four-line, at this moment induced current is zero.When occur to get an electric shock in the circuit or during leak current fault, have leakage current to flow through in the loop, at this moment pass the three-phase current phasor of zero sequence current mutual inductor and do not wait zero, its phasor and be: Ia+Ib+Ic=I (leakage current).The signal identification fault type and separate of sending here, accurate failure judgement zone and faulty line, and send control command or alarm signal.Electric network fault measure and control device of the prior art is simpler, can not analyze electric network fault, and it is slow to eliminate fault speed, can not realize the functions such as long-distance intelligent control, liquid crystal display and data protection.
Summary of the invention:
Technical problem to be solved by this invention is to provide a kind of and gathers, judges by the secondary voltage to voltage transformer; timely and accurately electric network fault is analyzed; and take corresponding action; utilize simultaneously the powerful logical operation capability of microprocessor to realize fast liquid crystal display, the electric network fault measure and control device of the functions such as telecommunication and data protection.
Technical problem to be solved by this invention adopts following technical scheme to realize:
The electric network fault measure and control device, it is characterized in that: comprise signal input part, be connected electrically in the signal acquisition process module of signal input part rear side, described signal input part comprises two little current signal inputs, a three-phase voltage, opening voltage, earth current and switching value input, described two little electric current inputs are connected with second singlechip with the first single-chip microcomputer respectively by the signal acquisition process module respectively again, described three-phase voltage, opening voltage, earth current is connected with switching value respectively and is connected with the 3rd single-chip microcomputer by the signal acquisition process module, described the first single-chip microcomputer is connected with second singlechip, described second singlechip is connected with the 4th single-chip microcomputer after being connected with the 3rd single-chip microcomputer jointly, on described the 4th single-chip microcomputer also with the supervisory keyboard module, 485 communication transmission modules, memory module, the LCD display module is connected with indicating lamp module.
Described second singlechip is connected with an alarm output module respectively with the 3rd single-chip microcomputer, and described the 3rd single-chip microcomputer also is connected with the control output module with the remote reset signal.
Described the first single-chip microcomputer, second singlechip, the 3rd single-chip microcomputer and the 4th single-chip microcomputer all are the embedded type CPU of 16 bit strip DSP functions.
Described indicator light comprises run indicator, arc light indicator light and alarm lamp.
Comprise the voltage transformer summation current transformer in the described signal acquisition process module.
The 3rd single-chip microcomputer mainly is responsible for gathering with regard to secondary three-phase voltage signal and secondary opening voltage through the signal acquisition process resume module, the three-phase voltage signal major control is between 0 to 150 behind the secondary acquisition, the opening voltage signal is controlled in the 100V, we by voltage transformer with signal controlling in 3.3V, be convenient to the single-chip microcomputer collection, at this moment we are by the voltage stabilizing chip with by becoming the cosine wave signal of suitable standard behind the voltage transformer, the power frequency of three-phase electricity is 50HZ as you know, be to be 0.02S in the cycle, the voltage signal of our 20 sections time samplings of average mark 20 times in one-period, then calculate voltage effective value within this cycle according to correlation formula, no-load voltage ratio by instrument transformer large in the voltage transformer no-load voltage ratio in the signal acquisition process module and the cabinet calculates actual voltage effective value at last, after can judging by the signal acquisition process module if there is fault, make corresponding control output and the output of reporting to the police, and the three-phase voltage signal that just gathers simultaneously, the opening voltage signal is delivered in the 4th single-chip microcomputer, the sampling that the signal acquisition process module can be instant when resonance occurring also can calculate the frequency of real-time opening voltage, whether reach power frequency according to frequency, if frequency does not meet frequency, relevant relay can be reported to the police in adhesive, in LCD shows, can immediately quote fault, and fault and the real-time frequency of correspondence occured to host computer by 485 communication transmission modules.
Second singlechip mainly is responsible for the collection with regard to zero-sequence current.If the effect of this part module is exactly isolated neutral or through the three-phase system of arc suppression coil and high resistance grounding in electrical network, in when, earth fault occuring when by a certain, owing to can not consist of short-circuit loop, earth fault current is often much smaller than load current, so this system is called as " small current neutral grounding system ", according to the requirement at scene, the way of small current neutral grounding can be divided into a lot of roads, and according to minimum current judgement principle, judge any road outlet fault.This signal acquisition process module can gather at most 35 tunnel zero-sequence current, second singlechip is responsible for the outlet current acquisition of one road inlet wire and the 1 road to the 17 tunnel, if the way of the zero-sequence current of customer requirement is greater than 17 the tunnel, at this moment will use the first single-chip microcomputer, this piece single-chip microcomputer is responsible for gathering greater than the 17 the tunnel and less than or equal to 35 tunnel zero-sequence current collection, these two single-chip microcomputers are passed to the zero-sequence current that gathers in the 4th single-chip microcomputer by the CAN bus, and second singlechip is responsible for the output of reporting to the police with the relay adhesive corresponding to way control of the correspondence of fault phase.
The 4th single-chip microcomputer with the electric current and voltage value that transmits in first and second and three single-chip microcomputers by the data processes and displays in LCD shows, pass to host computer and indicator light indication warning lamp by 485 communications modules.
The invention has the beneficial effects as follows: modularized design of the present invention, compact conformation, advanced technology, the high-speed dsp core processor is guaranteed computing real-time and action accuracy; Each intermodule adopts with from the CAN of error correction function, automatic arbitration, multiple host pattern bus communication, and the mass data exchange is shared; Fault is recollected function; The Chinese liquid crystal display, running status is clear, and the menu mode operation is convenient easy-to-use.
Description of drawings:
Fig. 1 is schematic diagram of the present invention.
Embodiment:
For technological means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
As shown in Figure 1, the electric network fault measure and control device, comprise signal input part, be connected electrically in the signal acquisition process module of signal input part rear side, signal input part comprises two little current signal inputs, a three-phase voltage, opening voltage, earth current and switching value input, two little electric current inputs are connected with second singlechip with the first single-chip microcomputer respectively by the signal acquisition process module respectively again, three-phase voltage, opening voltage, earth current is connected with switching value respectively and is connected with the 3rd single-chip microcomputer by the signal acquisition process module, the first single-chip microcomputer is connected with second singlechip, second singlechip is connected with the 4th single-chip microcomputer after being connected with the 3rd single-chip microcomputer jointly, on the 4th single-chip microcomputer also with the supervisory keyboard module, 485 communication transmission modules, memory module, the LCD display module is connected with indicating lamp module.Second singlechip is connected with an alarm output module respectively with the 3rd single-chip microcomputer, and described the 3rd single-chip microcomputer also is connected with the control output module with the remote reset signal.
The first single-chip microcomputer, second singlechip, the 3rd single-chip microcomputer and the 4th single-chip microcomputer all are the embedded type CPU of 16 bit strip DSP functions.Indicator light comprises run indicator, arc light indicator light and alarm lamp.Comprise the voltage transformer summation current transformer in the signal acquisition process module.
Three-phase voltage, opening voltage and earth current are by voltage and current instrument transformer corresponding in the cabinet, through after the secondary no-load voltage ratio with three-phase voltage signal, opening voltage signal and earth current signal are by passing to the signal acquisition process module, the signal acquisition process module allows the signal that receives in the scope of sampled voltage with they 16 single-chip microcomputers that convert PIC series to through the voltage transformer summation current transformer in the signal acquisition process module, the 3rd single-chip microcomputer, AD sampling and data through the 3rd single-chip microcomputer are processed, according to gathering and the three-phase voltage of data after processing relatively judges whether to have in the three-phase one mutually with the opening magnitude of voltage or severally break mutually that (broken string refers to that wherein a phase or a few phase voltage are less than 18 volts, and other two phase voltages are between 50 volts to 70 volts), under-voltage when referring to wherein a phase line voltage less than 70 volts (under-voltage), overvoltage (when overvoltage refers to wherein a phase line voltage greater than 130 volts), (arc grounding refers to that the phase voltage of a phase wherein is less than 18 volts to arc grounding, and the phase voltage of other two-phases is during greater than 80V), (metal ground connection refers to that the phase voltage of a phase wherein is less than 5.5 volts to metal ground connection, and the phase voltage of other two-phases is during greater than 80V), if corresponding fault is exported the namely warning of correspondence of relay adhesive of correspondence by 16 single-chip microcomputers of PIC series.Resulting voltage data and corresponding fault category are dealt into by the CAN bus in the RAM memory block of the 4th single-chip microcomputer, resulting triphase parameter and fault type are presented in the LCD demonstration.If corresponding switching value is arranged, the switching value here has following several, the first isolation signals, the wheelbarrow position of and cabinet charged when cabinet is when the service position, may be dangerous to operating personnel, switching value at this time is 24 volts high level, allow the signal acquisition process module can not enter high-tension electricity debugging part, second when arc grounding or metal ground connection occurring, at this moment the switching value of locking can be provided, this switching value also is 24 volts high level, 3 contactors are arranged in the cabinet, be respectively the A phase contact, the B phase contact, the C phase contact is when occuring wherein one when arc grounding or metal ground connection occur mutually, corresponding contactor action, and the switching value of corresponding contactor action issued the signal acquisition process module, these switching values allow the signal acquisition process module understand to know whether contactor moves by the 3rd single-chip microcomputer after the hardware handles, and are presented in the LCD demonstration.After the action of arc grounding or metal earthing contactor occurring, after if the staff gets rid of fault, operating personnel give the high level of one 24 volts of signal acquisition process modules at a distance in the control room, after the signal acquisition process module receives this remote reset signal, and restart to detect whether outlet fault, if fault is got rid of, the 3rd single-chip microcomputer can reset, the signal acquisition process module will allow control relay separately, thereby with the contactor separating brake in the cabinet.If after fault did not have eliminating not receive reset signal, relay can not separate, the contactor in the cabinet can not move yet like this.
After the processing of opening voltage signal by the filter circuit of signal acquisition process module, the 3rd single-chip microcomputer receives coherent signal.Behind the opening voltage out-of-limit, the signal acquisition process module is carried out computing and the Fourier series analyses of opening voltage magnitude immediately, the type (1/4,1/3,1/2 Subharmonic Resonance, fundamental resonance or 2～9 high-frequency resonants) of judging ferro resonance according to amplitude and the frequency of opening voltage.If be judged as the ferro resonance fault, system starts immediately microcomputer harmonic elimination function and drops into corresponding damping resistance, then again drops into damping resistance if the rear resonance of the automatic excision of lasting 0.2S clock still exists.If continuous five times (continuing the 6s clock) can not eliminate resonance, then stop microcomputer harmonic elimination function, simultaneously output alarm signal (passive relay contact).When resonance occured, display screen showed the frequency and the time that resonance occurs, and the data during record trouble can keep at most nearest 10 resonance fault messages simultaneously.The fault data of record comprises fault date, time, resonance frequency, the frequency, harmonic elimination number of times, opening voltage and each phase voltage.After the resonance fault disappeared, display screen turned back to the normal voltage observation interface.
Little current signal passes through zero sequence current mutual inductor, it is converted in the scope of single-chip microcomputer permission sampled voltage, AD sampling by second singlechip, judge wherein that road of electric current minimum, then process through data that to judge be the fault of which kind of type, be the inlet wire fault or corresponding each minute branch road fault, in the time of outlet arc grounding or metal ground connection, will accurately judge corresponding line number, the way of correspondence can be carried out fault alarm.And the line number of fault is dealt into the 4th single-chip microcomputer by the CAN bus it is presented in the LCD demonstration.If the circuit of route selection surpasses 17 the tunnel, will add first single-chip microcomputer, usefulness the first single-chip microcomputer that surpasses 17 tunnel parts gathers the zero-sequence current on each road, the zero-sequence current collection second singlechip of 1 to 17 tunnel parts.The principle that the first single-chip microcomputer is selected faulty line with above be the same, and the collection electric current that will obtain is dealt into second singlechip by the CAN bus, 1 to 17 tunnel the zero-sequence current that then will gather with second singlechip together compares, and selects corresponding faulty line and it is sent to the 4th single-chip microcomputer.
The 4th single-chip microcomputer can be controlled LCD by the operation of supervisory keyboard and show, reaches man-machine communication's effect.First can displaying time, can change the time by the supervisory keyboard operation.Second can change parameter value by interface operation.(1) baud rate of change 485 communications modules, and the address of signal acquisition process module; (2) no-load voltage ratio setting changes the no-load voltage ratio of electric current and the voltage of demonstration according to the needed current/voltage no-load voltage ratio of cabinet; The setting of (3) route selection way, numbering and earthing capacitance current value, the circuit required according to client arranges arbitrarily with the numbering of wanting; (4) thus can arrange can arrange ground connection the time whether to report to the police or show the value of earth current; (5) setting of password for the fail safe of customer data can arrange the password that the user wants, and can be done change.The 3rd can inquire about failure logging, corresponding time when showing the fault type occured and parameter value and generation in the record.The 4th has corresponding indicator light light on and off when corresponding fault occurring or normally moving.The 5th is transferred to host computer with real-time triphase parameter and fault category by 485 communications modules, conveniently like this checks data in the strange land.
More than show and described basic principle of the present invention and principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; that describes in above-described embodiment and the specification just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (5)
1. electric network fault measure and control device, it is characterized in that: comprise signal input part, be connected electrically in the signal acquisition process module of signal input part rear side, described signal input part comprises two little current signal inputs, a three-phase voltage, opening voltage, earth current and switching value input, described two little electric current inputs are connected with second singlechip with the first single-chip microcomputer respectively by the signal acquisition process module respectively again, described three-phase voltage, opening voltage, earth current is connected with switching value respectively and is connected with the 3rd single-chip microcomputer by the signal acquisition process module, described the first single-chip microcomputer is connected with second singlechip, described second singlechip is connected with the 4th single-chip microcomputer after being connected with the 3rd single-chip microcomputer jointly, on described the 4th single-chip microcomputer also with the supervisory keyboard module, 485 communication transmission modules, memory module, the LCD display module is connected with indicating lamp module.
2. electric network fault measure and control device according to claim 1, it is characterized in that: described second singlechip is connected with an alarm output module respectively with the 3rd single-chip microcomputer, and described the 3rd single-chip microcomputer also is connected with the control output module with the remote reset signal.
3. electric network fault measure and control device according to claim 1, it is characterized in that: described the first single-chip microcomputer, second singlechip, the 3rd single-chip microcomputer and the 4th single-chip microcomputer all are the embedded type CPU of 16 bit strip DSP functions.
4. electric network fault measure and control device according to claim 1, it is characterized in that: described indicator light comprises run indicator, arc light indicator light and alarm lamp.
5. electric network fault measure and control device according to claim 1 is characterized in that: comprise the voltage transformer summation current transformer in the described signal acquisition process module.
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| CN2012105673174A CN103066579A (en) | 2012-12-24 | 2012-12-24 | Grid fault measuring and control device |
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| CN2012105673174A CN103066579A (en) | 2012-12-24 | 2012-12-24 | Grid fault measuring and control device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107727990A (en) * | 2017-10-23 | 2018-02-23 | 云南电网有限责任公司电力科学研究院 | A kind of distribution arc grounding fault identification method |
| CN108306274A (en) * | 2018-02-23 | 2018-07-20 | 南京南瑞继保电气有限公司 | A kind of control method that ferromagnetic resonance for electromagnetic voltage transformer is eliminated |
| CN114137295A (en) * | 2021-11-27 | 2022-03-04 | 台州安耐杰电力设备有限公司 | Three-phase circuit data measurement and control device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090080127A1 (en) * | 2007-09-20 | 2009-03-26 | Rockwell Automation Technologies, Inc. | Technique for high-impedance ground fault detection at the common dc bus of multi-axis drives |
| CN202127233U (en) * | 2011-06-16 | 2012-01-25 | 安徽国科电力设备有限公司 | Power grid fault measuring and controlling device |
| CN203103934U (en) * | 2012-12-24 | 2013-07-31 | 上海合凯电气科技有限公司 | Measurement and control device for grid faults |
-
2012
- 2012-12-24 CN CN2012105673174A patent/CN103066579A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090080127A1 (en) * | 2007-09-20 | 2009-03-26 | Rockwell Automation Technologies, Inc. | Technique for high-impedance ground fault detection at the common dc bus of multi-axis drives |
| CN202127233U (en) * | 2011-06-16 | 2012-01-25 | 安徽国科电力设备有限公司 | Power grid fault measuring and controlling device |
| CN203103934U (en) * | 2012-12-24 | 2013-07-31 | 上海合凯电气科技有限公司 | Measurement and control device for grid faults |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107727990A (en) * | 2017-10-23 | 2018-02-23 | 云南电网有限责任公司电力科学研究院 | A kind of distribution arc grounding fault identification method |
| CN108306274A (en) * | 2018-02-23 | 2018-07-20 | 南京南瑞继保电气有限公司 | A kind of control method that ferromagnetic resonance for electromagnetic voltage transformer is eliminated |
| CN108306274B (en) * | 2018-02-23 | 2019-04-09 | 南京南瑞继保电气有限公司 | A kind of control method that ferromagnetic resonance for electromagnetic voltage transformer is eliminated |
| CN114137295A (en) * | 2021-11-27 | 2022-03-04 | 台州安耐杰电力设备有限公司 | Three-phase circuit data measurement and control device |
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