CN101493477A - Fraudulent use load management terminal - Google Patents
Fraudulent use load management terminal Download PDFInfo
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- CN101493477A CN101493477A CNA200810187646XA CN200810187646A CN101493477A CN 101493477 A CN101493477 A CN 101493477A CN A200810187646X A CNA200810187646X A CN A200810187646XA CN 200810187646 A CN200810187646 A CN 200810187646A CN 101493477 A CN101493477 A CN 101493477A
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Abstract
The invention relates to a device for avoiding and instructing fraudulent use, in particular to a power-stealing resistance load management terminal, comprising a power-stealing detection device which includes a choosing unit, a signal acquisition unit, a detection unit, an analog-to-digital conversion unit, a comparison unit, a frequency generator, a signal coupling unit and a signal processing unit. The power-stealing resistance load management terminal collects and detects the harmonic signal of each detection unit in a current circuit in real time, chooses the harmonic signal with smallest amplitude, and uses the frequency of the harmonic signal with smallest amplitude as the frequency of the detection signal, so the chosen detection signal actively avoids the harmonic signal with large interference. The device overcomes the shortcoming of the prior art that only fixed-frequency disturbance signals can be sent out. Simutaneously, the power-stealing resistance load management terminal can detect various power-stealing happenings that the current circuit is opened and short cut, or a lalrge transformation ratio current transformer is replaced; and the power-stealing resistance load management terminal is a comprehensive power-stealing resistance load management terminal.
Description
Technical field
The present invention relates to avoid and indicate the device of duplicity use, specifically is the fraudulent use load management terminal of the various electric current stealings of a kind of complete detection.
Background technology
Notification number is that the utility model patent of CN2754103Y discloses a kind of thief-proof electric energy meter that can monitor CT (current transformer) state, by in electronic electric energy meter, setting up disturbance component, adopt method of perturbation to measure the state of CT: by the Single-chip Controlling multiway analog switch disturbing signal of characteristic frequency to be injected the metering circuit loop, monitor the current perturbation of this characteristic frequency and just can judge that this CT is in normal condition still by short circuit or open circuit.Because electricity consumption watch core sheet is measured current electric current and voltage and performance number in the document, the characteristic of described ammeter chip determines it can only measure first-harmonic, can not measure each harmonic, so the harmonic signal that can't obtain in the particular electrical circuit is a noise signal, and then can't differentiate the annoyance level of each frequency noise signal; The disturbing signal detecting of the signal generator emission fixed frequency by adopting two fixed frequencies in the document has or not stealing to take place.Owing to adopted the disturbing signal of fixed frequency, near (be in 10% scope of noise signal frequencies in the disturbing signal frequency time), can't determine whether the generation of stealing situation in noise signal and described disturbing signal frequency.In fact the intensity of the each harmonic signal of various circuit has nothing in common with each other, disclosed electric energy meter can not be measured harmonic signal in the document, and disturbing signal is fixed, so can't when the disturbing signal of additional characteristic frequency, initiatively avoid noise signal (above-mentioned harmonic signal), also just can't select the disturbing signal of reasonable frequency according to the circuit self-characteristic, cause described electric energy meter to be suitable under specific circumstances, useful range is narrow, measurement result under a lot of situations all is inaccurate, and especially measurement result is unreliable when noise pollution is serious.In addition, the electric energy meter of the document can only be measured the state of CT open circuit or short circuit, can not detect the electric current electricity filching behavior of changing large velocity ratio CT, so the ammeter in the document does not have the function of the various electric current electricity filching behaviors of comprehensive monitoring.
Summary of the invention
For this reason, technical matters to be solved by this invention is to provide the fraudulent use load management terminal of the various electric current stealings of a kind of complete detection.
For solving the problems of the technologies described above, the technical solution used in the present invention is as follows:
A kind of fraudulent use load management terminal comprises supply module, data management module, communication module, to realize the conventional func of described load management terminal, also comprises fraudulent use detection device,
Described electricity filching device further comprises:
A selected cell is used for selecting a phase current loop as detecting current return in the polyphase current loop;
A signal gathering unit is used for gathering the each harmonic signal of described detection current return or detection signal;
A detection unit receives the each harmonic signal of described signal gathering unit collection and detects each harmonic signal in the scheduled frequency range or described detection signal according to the current status branch in the corresponding described detection current return respectively;
A comparing unit receives the each harmonic signal in the described scheduled frequency range, and the each harmonic signal in the described scheduled frequency range is compared, and selects wherein minimum amplitude harmonic signal;
A frequency generator, the frequency of the minimum amplitude harmonic signal correspondence of selecting according to described comparing unit is sent the described detection signal of same frequency;
A signal coupling unit is used for described detection signal is coupled to described detection current return;
A signal processing unit, the predetermined value when being used for that described detection signal and described detection current return do not had stealing compares, and judges to have or not the stealing incident to take place;
An output unit is used to export comparison, the judged result of described signal processing unit.
Described fraudulent use detection device also comprises an AD conversion unit, and the each harmonic signal in the scheduled frequency range that is used for described detection unit is detected and the analog signal conversion of described detection signal are data-signal; Described signal processing unit stores the predetermined value of described detection signal at no stealing state, described signal processing unit receives the described detection signal that described AD conversion unit is changed out, and calculate the effective value of described detection signal, described effective value and the described predetermined value of calculating the described detection signal of gained compared; Described comparing unit, described frequency generator and described signal processing unit are integrated in the central processing unit; Described central processing unit receives the data-signal from described AD conversion unit, finishes and selects the minimum amplitude harmonic signal, sends according to the frequency of selected minimum amplitude harmonic signal and have the described detection signal of same frequency and relatively judge the function that has or not the stealing incident to take place.
Described detection unit detects the programmable filter of certain frequency harmonic signal at least one in order to branch under the control of described central processing unit.
Described signal gathering unit is at least one signal acquisition circuit, and each described signal acquisition circuit comprises a Verification of Measuring Current Transformer that is used for gathering the current signal of described detection current return;
Described signal coupling unit is at least one signal coupling circuit, and each described signal coupling circuit comprises a coupling Current Transformer that is used for described detection signal is coupled to described detection current return;
Described coupling Current Transformer and described Verification of Measuring Current Transformer are series in the described detection current return.
The described coupling Current Transformer and the described Verification of Measuring Current Transformer spacing that are series at described detection current return are equal to, or greater than 10 millimeters.
For the three-phase four-line system system, the number of described signal acquisition circuit and described signal coupling circuit is three.
For the three-phase three-wire circuit system, the number of described signal acquisition circuit and described signal coupling circuit is two.
For three-phase four-line system system or three-phase three-wire circuit system, the number of described signal acquisition circuit and described signal coupling circuit is one.
The described coupling Current Transformer and the described Verification of Measuring Current Transformer spacing that are series at described detection current return equal 12 millimeters.
Described communication module is local communication module or local communication module and wireless telecommunications template.
Technique scheme of the present invention has the following advantages compared to existing technology:
The real-time acquisition testing current return of fraudulent use load management terminal of the present invention each harmonic signal, in particular frequency range, select the harmonic signal of amplitude minimum, with the frequency of the minimum harmonic signal of the described amplitude frequency as detection signal, the detection signal of selecting has so initiatively avoided disturbing bigger harmonic signal.Overcome and to have sent the fixed frequency disturbing signal in the prior art and then cause the inaccurate drawback of testing result, guaranteed the accurate of testing result.Simultaneously, fraudulent use load management terminal of the present invention can detect that current return is opened a way, current return is by short circuit and be replaced the various electric current stealing of current mutual inductor with high transforming ratio incident, is a kind of fraudulent use load management terminal of comprehensively anti-electric current stealing.
Description of drawings
For the easier quilt of content of the present invention is clearly understood, below according to a particular embodiment of the invention and in conjunction with the accompanying drawings, the present invention is further detailed explanation, wherein
Fig. 1 is the signal coupling circuit of one embodiment of the invention;
Fig. 2 is the signal acquisition circuit of one embodiment of the invention;
Fig. 3 is fraudulent use load management terminal link position figure in the one embodiment of the invention;
Fig. 4 is the anti-electricity-theft testing process figure of the embodiment of the invention.
Embodiment
As one embodiment of the present of invention, be example with the three-phase four-line system system, the present invention also is applicable to the three-phase three-wire circuit system certainly.
A kind of fraudulent use load management terminal comprises fraudulent use detection device; And the supply module, data management module, the communication module that are electrically connected with described fraudulent use detection device, wherein said communication module is local communication module or local communication module and wireless communication module, to realize the conventional func of described load management terminal.Wherein, described data management module mainly is responsible for the statistics of data, the parsing of power load management system data transmission stipulations, data acquisition, load control, time keeping, terminal debugging etc.Described data management module receives the various data that described fraudulent use detection device is passed back; And by described wireless communication module and management main website realization exchanges data.Described local communication module provides isolates 232 interfaces, the communication that is used to debug described terminal management apparatus or realization and described terminal management apparatus.Described supply module is for whole described terminal management apparatus provides power supply.Described power supply can provide 5V, 3.3V, 12V etc. as required.What described data management module, described local communication module, described wireless communication module, described power management module were realized is the conventional func of electricity load management terminal, and this does not give unnecessary details.Described fraudulent use detection device is realized exchanging and is gathered and two kinds of functions of stealing detection.
Described fraudulent use detection device comprises: a selected cell is used for selecting a phase current loop as detecting current return in the polyphase current loop; A signal gathering unit is used for gathering the each harmonic signal of described detection current return or detection signal; A detection unit receives the each harmonic signal of described signal gathering unit collection and detects each harmonic signal in the scheduled frequency range or described detection signal according to the current status branch in the described detection current return respectively; An AD conversion unit is used for that described detection unit is detected each harmonic signal in the scheduled frequency range and the analog signal conversion of described detection signal is a data-signal; Comparing unit, be used to receive the data-signal of the each harmonic signal in the scheduled frequency range that described AD conversion unit changes out, and the data-signal of the each harmonic signal in the described scheduled frequency range compared, select wherein minimum amplitude harmonic signal; A frequency generator, the frequency of the minimum amplitude harmonic signal correspondence of selecting according to described comparing unit is sent the described detection signal of same frequency; A described signal coupling unit is used for described detection signal is coupled to described detection current return; A signal processing unit, store the predetermined value of described detection signal at no stealing state, described signal processing unit receives the described detection signal that described detection unit detects, and calculate the effective value of described detection signal, described effective value and the described predetermined value of calculating the described detection signal of gained are compared, judge to have or not the stealing incident to take place; An output unit is used to export comparison, the judged result of described signal processing unit.Wherein, described comparing unit, described frequency generator and described signal processing unit are integrated in the central processing unit.
In the present embodiment, described signal gathering unit is three signal acquisition circuits, and each described signal acquisition circuit comprises a Verification of Measuring Current Transformer that is arranged on current signal on the described detection current return, that be used for gathering described detection current return; Described signal coupling unit is three signal coupling circuits, and wherein each described signal coupling circuit comprises a coupling Current Transformer that is used for described detection signal is coupled to described detection current return; Described coupling Current Transformer and described Verification of Measuring Current Transformer are series in the described detection current return.The described coupling Current Transformer and the described Verification of Measuring Current Transformer spacing that are series at same described detection current return are 12 millimeters.Described detection unit is the programmable filter of a U.S. letter 262, described programmable filter receives the phase current current in loop signal that described selected cell is selected, and divides harmonic signal or the detection signal that detects certain frequency under the control of central processing unit.Described selected cell is the analog switch of U.S. letter 3051, and it receives three current signals that described three signal acquisition circuits are gathered out, and a current signal will selecting flows to described programmable filter.Described AD conversion unit is an analog to digital conversion circuit.
The programmable filter of the also available LM10 of National Semiconductor of programmable filter of U.S. letter 262 substitutes described in the present embodiment.
The described coupling Current Transformer that is series in the same phase current loop should be equal to, or greater than 10 millimeters to the distance of described Verification of Measuring Current Transformer, prevent described coupling Current Transformer and the mutual interference mutually of described Verification of Measuring Current Transformer, guarantee its normal use.
Wherein, shown in Figure 1 is the described signal coupling circuit of present embodiment, the base stage of triode shown in the figure receives the detection signal that central processing unit sends, and the coupling Current Transformer by the back utmost point couples a signal to described coupling Current Transformer secondary side loop, promptly detects in the current return.Be connected with a diode between the emitting stage of described triode and collector, the secondary side of described coupling Current Transformer is connected with another diode, plays the effect of the described signal coupling circuit of protection.
Shown in Figure 2 is the described signal acquisition circuit of present embodiment, modulate circuit for single supply operational amplifier formation, as shown in the figure, by the current signal in the Verification of Measuring Current Transformer acquisition testing current return, the input end of the output termination analog-digital conversion circuit as described of amplifier is used to realize the collection of fundamental signal in the solid box; The input end of the described programmable filter of output termination of amplifier is used to gather the each harmonic signal in the frame of broken lines.Be parallel with the opposite diode of both direction between the input end of first order operational amplifier, the top effect that disappears is played in breakdown and then conducting under the situation of current break.
During use, described fraudulent use load management terminal and electric energy meter are series in the current return, link position as shown in Figure 3.
The course of work of described fraudulent use detection device is as follows, with reference to shown in Figure 4: at first, select a phase current loop as detecting current return, corresponding to step S31 in the three-phase current loop by analog switch; Gather current status in the described detection current return by described signal acquisition circuit, judge in the described detection current return whether electric current is arranged, corresponding to step S32.
When electric current is zero in the described detection current return, gather current signal in the described detection current return by described signal acquisition circuit earlier; Detect each harmonic signal between the 600hz-1000hz by described programmable filter then, and be converted to data volume by analog-digital conversion circuit as described; Follow described comparing unit and receive the each harmonic signal that analog-digital conversion circuit as described changes out and compare, select the wherein harmonic signal of minimum amplitude correspondence; Said method is corresponding to step S34.Send the pulse signal identical as detection signal by described central processing unit then again, be coupled to by described signal coupling circuit and detect in the current return, corresponding to step S35 with the minimum amplitude harmonic frequency signal; Gather the current signal of ten cycles in the described detection current return successively again by signal acquisition circuit, corresponding to step S36; Detect described detection signal by described detecting circuit again, and be converted to data volume by analog-digital conversion circuit as described; The described detection signal of changing out is sent to described signal processing unit, calculates the effective value of described detection signal by described signal processing unit, corresponding to step S37; And the current effective value during with the described detection current return open circuit that prestores in described effective value and central processing unit when detection current return open circuit (described noise figure) compares; The current effective value when if the effective value of the detection signal that calculates is opened a way less than described detection current return, then described detection current return open circuit, expression has the stealing incident to take place, corresponding to step S38 and S41; Otherwise, the current effective value when if the effective value of the detection signal that calculates is greater than or equal to described detection current return open circuit and less than detecting current return definite value (detecting the current value of detection signal under the current return normal operating conditions), the then corresponding current transformer that has been replaced large velocity ratio mutually, expression has the stealing incident to take place, corresponding to step S40.The current effective value when if the effective value of the detection signal that calculates is greater than or equal to described detection current return open circuit and also be greater than or equal to and detect the current return definite value, then described detection current return is normal, represent that no stealing incident takes place, corresponding to step S42.
When described detection current return electric current is zero, be chosen in the interscan of 600hz-1000hz particular frequency range in the present embodiment, the scope of described characteristic frequency is by the characteristic decision of current transformer, promptly by described operation of current transformers frequency range decision, the set specific frequency signal of selecting is promptly wanted without hindrance transmission (cutoff frequency that promptly can not be higher than described current transformer), also to avoid the bigger harmonic wave of on-the-spot interference and (promptly mainly avoid on-the-spot 7 relatively abundanter subharmonic, 9 subharmonic and 11 subharmonic), should avoid the bigger harmonic frequency signal of above-mentioned interference when selecting described detection signal frequency, avoid detection signal and original noise signal to interfere with each other, influence the degree of accuracy of the detection signal that collects, and then influence the accuracy of testing result.The frequency of finding out minimum amplitude noise signal correspondence is as the detection signal frequency, promptly selecting the signal frequency of humorous intensity of wave the most weak (being the amplitude minimum) in the certain frequency scope is the detection signal frequency, avoid disturbing in the described detection electric current current return bigger harmonic wave, improve anti-humorous intensity of wave, guarantee the reliability of testing result.Detection signal in the present embodiment is to determine constantly according to the power of the each harmonic signal in the described detection current return, be the result of Dynamic Selection in particular frequency range, avoided disturbing bigger harmonic signal, overcome in the prior art can only additional fastening frequency disturbance signal drawback, assurance can both drop to harmonic interference minimum in all cases, guarantees the accurate, reliable of testing result.In like manner, when electric current was non-vanishing in the described detection current return, described central processing unit was controlled described programmable filter branch and is detected each harmonic signal in the particular frequency range of 5khz-30khz.
When electric current is non-vanishing in the described detection current return, earlier gather current signal in the described detection current return by described signal acquisition circuit; Detect each harmonic signal between the 5khz-30khz by described programmable filter then, and be converted to data volume by analog-digital conversion circuit as described; Follow described comparing unit and receive the each harmonic signal that analog-digital conversion circuit as described changes out and compare, select the wherein harmonic signal of minimum amplitude correspondence, preceding method is corresponding to step S43; Send the pulse signal identical as detection signal by described central processing unit then again, be coupled in the described detection current return, corresponding to step S44 by described signal coupling circuit with the minimum amplitude harmonic frequency signal; Gather the current signal of ten cycles in the described detection current return successively again by described signal acquisition circuit, detect described detection signal by described detecting circuit again, and be converted to data volume, corresponding to step S45 by analog-digital conversion circuit as described; The described detection signal of changing out is sent to described signal processing unit, calculates the effective value of described detection signal by described signal processing unit, corresponding to step S46; And the current effective value during with the described detection short circuit of current loop that prestores in described effective value and the central processing unit compares; If the current effective value of the effective value of the detection signal that calculates during greater than described detection short circuit of current loop, then described phase short circuit, expression have the stealing incident to take place, corresponding to step S47 and S48; Otherwise the current effective value when if the effective value of the detection signal that calculates is less than or equal to described detection short circuit of current loop, then described detection current return place circuitry phase is normal, represents that no stealing incident takes place, corresponding to step S49.
Described fraudulent use detection device has or not the situation that the stealing incident takes place to send described data management module to detected, the described stealing situation that has or not is exported by described communication module by described data management module.
One phase current loop is detected and is finished, under the control of described central processing unit, select a phase current loop as detecting current return again by described analog switch, repeat above-mentioned stealing testing process, all test up to all the phase current loops that need measure and to finish, then stealing detects and finishes, corresponding to step S50 and S51.
Wherein, described signal processing unit calculates the effective value of described detection current return by fast fourier transformation algorithm.
Fraudulent use detection device of the present invention can be realized AC sampling, and then realizes the metering of electric energy, and therefore described fraudulent use detection device of the present invention or described fraudulent use load management terminal can be directly installed on the installation site of electric energy meter fully, replace described electric energy meter.Described AC sampling realizes in accordance with the following methods: described detection current return by Verification of Measuring Current Transformer receiving test circuit loop electric current and the analog quantity by voltage in the electric resistance partial pressure method acquisition testing loop be sent to analog to digital conversion circuit, analog-digital conversion circuit as described sends the data-signal of voltage in the described detection loop of changing out to central processing unit, central processing unit is according to fast fourier transformation algorithm, calculate the data such as effective voltage, electric current, active power, reactive power, power factor, electric weight of described detection current return, realize AC sampling.Simultaneously can judge whether various voltage stealing situations take place, such as whether having voltage stealing situations such as the voltage phase failure, voltage decompression, electric current and voltage phase sequence mistake to take place according to the result of AC sampling.Because of the technology that detects the voltage stealing is a prior art, this does not give unnecessary details.
In the present embodiment, described multiway analog switch is positioned at the front end of described programmable filter, is used to select a phase current current in loop to import described programmable filter, so the number of described programmable filter is one.To those skilled in the art, if described multiway analog switch is placed the rear end of described programmable filter, the front end of analog-digital conversion circuit as described, be used to select phase current current in loop input analog-digital conversion circuit as described, then the number of described programmable filter can be three, to be complementary with described signal acquisition circuit, each described programmable filter only is used for the electric current of a mutually described current return is carried out detection.
As an alternative embodiment of the invention, described selected cell is a multidiameter option switch; Described signal gathering unit is a signal acquisition circuit that adopts the dual power supply operational amplifier to constitute; Described signal coupling unit is a signal coupling circuit; Described detection unit is a multifrequency point wave filter; Described signal coupling circuit, described signal acquisition circuit and described multifrequency point wave filter constitute a cover signal coupling, collection and filtering circuit, the described shared successively described cover signal coupling of current return, collection and the detecting circuit of respectively detecting mutually.Described multidiameter option switch is positioned at the front end of described signal acquisition circuit, is used to select a phase current loop to carry out described signals collecting.Described comparing unit and described signal processing unit all are made of threshold circuit, and wherein, the threshold value of the threshold circuit of described signal processing unit is the current value of described detection signal during no stealing in the described testing circuit loop.
The detailed process that stealing detects is as follows: at first, select a phase current loop as detecting current return by described selected cell, realize the collection of electric signal by described signal coupling, collection and filtering circuit.And then judge whether electric current is zero in the described detection current return, selects the frequency range of harmonic signal according to judged result.Specifically be, when the electric current in the described detection current return was zero, the frequency range of described harmonic signal was 600hz-1000hz, and when the electric current in the described detection current return was non-vanishing, the frequency range of described harmonic signal was 5khz-30khz.Then, the each harmonic signal that collects is sent to the threshold circuit of described comparing unit, selects the minimum amplitude harmonic signal by described threshold circuit.Then, send and the consistent detection signal of described minimum amplitude harmonic frequency signal, be coupled in the described detection current return of selecting via described signal coupling circuit by described central processing unit.Again then, gather described detection signal by described signal acquisition circuit and described multifrequency point wave filter.At last, described detection signal compares via described signal processing unit threshold circuit, judges to have or not the stealing incident to take place.Concrete deterministic process is with first embodiment, and this does not give unnecessary details.
One phase current loop is detected and is finished, and selects another phase current loop by described multidiameter option switch again and carries out the stealing detection as detecting current return, detects up to all phase current loops to finish.
For the three-phase three-wire circuit system, the number of described signal acquisition circuit and described signal coupling circuit is two.Because in the three-phase three-wire circuit system, only need to survey the biphase current current in loop and can finish stealing detection and electric quantity metering, so all there are separately independently Acquisition Circuit and signal coupling circuit in every phase current loop, the shared described programmable filter in described biphase current loop.
For three-phase four-line system system or three-phase three-wire circuit system, the number of described signal acquisition circuit and described signal coupling circuit is one, each detects the collection and the coupling of shared described signal acquisition circuit of current return and described signal coupling circuit realization signal mutually, to reach the purpose of saving cost.
Obviously, the foregoing description only is for example clearly is described, and is not the qualification to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here need not also can't give exhaustive to all embodiments.And conspicuous variation of being extended out thus or change still are among the protection domain of the invention.
Claims (10)
1. a fraudulent use load management terminal comprises supply module, data management module, communication module, to realize the conventional func of described load management terminal, it is characterized in that: also comprise fraudulent use detection device,
Described electricity filching device further comprises:
A selected cell is used for selecting a phase current loop as detecting current return in the polyphase current loop;
A signal gathering unit is used for gathering the each harmonic signal of described detection current return or detection signal;
A detection unit receives the each harmonic signal of described signal gathering unit collection and detects each harmonic signal in the scheduled frequency range or described detection signal according to the current status branch in the corresponding described detection current return respectively;
A comparing unit receives the each harmonic signal in the described scheduled frequency range, and the each harmonic signal in the described scheduled frequency range is compared, and selects wherein minimum amplitude harmonic signal;
A frequency generator, the frequency of the minimum amplitude harmonic signal correspondence of selecting according to described comparing unit is sent the described detection signal of same frequency;
A signal coupling unit is used for described detection signal is coupled to described detection current return;
A signal processing unit, the predetermined value when being used for the described detection signal that will collect and described detection current return and not having stealing compares, and judges to have or not the stealing incident to take place;
An output unit is used to export comparison, the judged result of described signal processing unit.
2. fraudulent use load management terminal according to claim 1, it is characterized in that: also comprise an AD conversion unit, the each harmonic signal in the scheduled frequency range that is used for described detection unit is detected and the analog signal conversion of described detection signal are data-signal; Described comparing unit, described frequency generator and described signal processing unit are integrated in the central processing unit; Described signal processing unit stores the predetermined value of described detection signal at no stealing state, described signal processing unit receives the described detection signal that described AD conversion unit is changed out, and calculate the effective value of described detection signal, described effective value and the described predetermined value of calculating the described detection signal of gained compared; Described central processing unit receives the data-signal from described AD conversion unit, finishes and selects the minimum amplitude harmonic signal, sends according to the frequency of selected minimum amplitude harmonic signal and have the described detection signal of same frequency and relatively judge the function that has or not the stealing incident to take place.
3. fraudulent use load management terminal according to claim 2 is characterized in that: described detection unit detects the programmable filter of certain frequency harmonic signal at least one in order to branch under the control of described central processing unit.
4. fraudulent use load management terminal according to claim 3 is characterized in that:
Described signal gathering unit is at least one signal acquisition circuit, and each described signal acquisition circuit comprises a Verification of Measuring Current Transformer that is used for gathering the current signal of described detection current return;
Described signal coupling unit is at least one signal coupling circuit, and each described signal coupling circuit comprises a coupling Current Transformer that is used for described detection signal is coupled to described detection current return;
Described coupling Current Transformer and described Verification of Measuring Current Transformer are series in the described detection current return.
5. fraudulent use load management terminal according to claim 4 is characterized in that: the described coupling Current Transformer and the described Verification of Measuring Current Transformer spacing that are series at described detection current return are equal to, or greater than 10 millimeters.
6. fraudulent use load management terminal according to claim 5 is characterized in that: the described coupling Current Transformer and the described Verification of Measuring Current Transformer spacing that are series at described detection current return equal 12 millimeters.
7. fraudulent use load management terminal according to claim 4 is characterized in that: for the three-phase four-line system system, the number of described signal acquisition circuit and described signal coupling circuit is three.
8. fraudulent use load management terminal according to claim 4 is characterized in that: for the three-phase three-wire circuit system, the number of described signal acquisition circuit and described signal coupling circuit is two.
9. fraudulent use load management terminal according to claim 4 is characterized in that: for three-phase four-line system system or three-phase three-wire circuit system, the number of described signal acquisition circuit and described signal coupling circuit is one.
10. according to the arbitrary described fraudulent use load management terminal of claim 1-9, it is characterized in that: described communication module is local communication module or local communication module and wireless communication module.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810187646 CN101493477B (en) | 2008-12-29 | 2008-12-29 | Fraudulent use load management terminal |
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| CN 200810187646 CN101493477B (en) | 2008-12-29 | 2008-12-29 | Fraudulent use load management terminal |
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| CN101493477A true CN101493477A (en) | 2009-07-29 |
| CN101493477B CN101493477B (en) | 2010-09-01 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102981031A (en) * | 2011-09-05 | 2013-03-20 | 江苏林洋电子股份有限公司 | Electric energy meter and electricity larceny prevention circuit thereof |
| CN103792420A (en) * | 2014-01-26 | 2014-05-14 | 威胜集团有限公司 | Electricity larceny preventing and electricity utilization monitoring method based on load curves |
-
2008
- 2008-12-29 CN CN 200810187646 patent/CN101493477B/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102981031A (en) * | 2011-09-05 | 2013-03-20 | 江苏林洋电子股份有限公司 | Electric energy meter and electricity larceny prevention circuit thereof |
| CN102981031B (en) * | 2011-09-05 | 2015-04-22 | 江苏林洋电子股份有限公司 | Electric energy meter and electricity larceny prevention circuit thereof |
| CN103792420A (en) * | 2014-01-26 | 2014-05-14 | 威胜集团有限公司 | Electricity larceny preventing and electricity utilization monitoring method based on load curves |
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| Publication number | Publication date |
|---|---|
| CN101493477B (en) | 2010-09-01 |
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