CN108152552A - A kind of electricity anti-theft method for precisely capture Dimmer interference - Google Patents
A kind of electricity anti-theft method for precisely capture Dimmer interference Download PDFInfo
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- CN108152552A CN108152552A CN201711476682.3A CN201711476682A CN108152552A CN 108152552 A CN108152552 A CN 108152552A CN 201711476682 A CN201711476682 A CN 201711476682A CN 108152552 A CN108152552 A CN 108152552A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
- G01R11/02—Constructional details
- G01R11/24—Arrangements for avoiding or indicating fraudulent use
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Abstract
A kind of electricity anti-theft method for precisely capture Dimmer interference, acquisition 64 alternating voltage data of a cycle simultaneously do Fast Fourier Transform (FFT), calculate its frequency domain data, this method does not take the odd harmonic of generally existing in electric system, and the even harmonic content for choosing plurality of 20 times or more is analyzed as typical frequency domain data, to judge whether voltage sample is interfered by Dimmer governors, so as to achieve the purpose that accurately to capture.On the basis of capture Dimmer governors interference, switch the metering method of electricity in time, electricity is measured using rated voltage and collected current effective value.
Description
Technical field
The present invention relates to a kind of methods of accurate capture Dimmer interference, and electricity stealing is prevented in time convenient for Utilities Electric Co.,
Ensure that Electrical Safety and electric power enterprise economy are not suffered a loss.
Background technology
The single-phase electric energy meter of mainstream all prevents stealing using the method for double-loop metering at present, when logical on firewire and zero curve
When the electric current crossed is inconsistent, selects and electricity is measured by the larger circuit of electric current.But pass through a kind of external common device：
Dimmer governors can just make the thief-proof electrical method of double-loop metering perform practically no function, and electric power enterprise is made to suffer heavy losses.
Electric energy meter is logical to measure by the phase difference between voltage on sample power line respectively, current signal and the two
Cross the active and reactive electricity of electric energy meter.Dimmer governors reach the mesh of stealing by the voltage sample of interferometer equipment
's.At present, it still has no idea to be monitored the stealing information of Dimmer governors.
Invention content
The purpose of the present invention is being directed to the problem of stealing information of Dimmer governors is difficult to monitoring, a kind of use is proposed
In the electricity anti-theft method of precisely capture Dimmer interference.
The technical scheme is that：
The present invention provides a kind of electricity anti-theft method for precisely capture Dimmer interference, and this method includes the following steps：
S1, using standard sine wave as check sample, in the case where electric energy meter connects Dimmer governors, acquire standard
Alternating voltage data in sine wave a cycle are handled, and acquisition connects governor voltage frequency domain character threshold value；
S2, using standard sine wave as check sample, in the case where electric energy meter does not connect Dimmer governors, according to preceding
It states step acquisition and does not connect governor voltage frequency domain character threshold value；
When S3, electric energy meter normal work, the alternating voltage real time data in a cycle is acquired, obtains real-time voltage frequency domain
Characteristic value, according to real-time voltage frequency domain character value with connecing governor voltage frequency domain character threshold value, not meeting governor voltage frequency domain spy
Whether the degree of closeness differentiation of sign threshold value has Dimmer interference.
Further, there are 32,64 or 128 alternating voltage data in S1, in a cycle.
Further, S1 is specially：
S1-1, using standard sine wave as check sample, in the case where electric energy meter connects Dimmer governors, acquisition mark
It is corresponding to obtain its as sample to sample progress Fast Fourier Transform (FFT) for alternating voltage data in quasi-sine-wave a cycle
Frequency domain data；
Even harmonic content more than several n times in S1-2, the aforementioned sample frequency domain data of acquisition is typical as table is connect
Frequency domain data；
S1-3, to it is aforementioned connect table typical case frequency domain data carry out it is inverted take and handle again, obtain connecing governor voltage frequency domain
Characteristic value；
S1-4, it repeats step S1-1 to 1-3 several times, obtains several and connect governor voltage frequency domain character value, calculate it
Average value is used as and connects governor voltage frequency domain character threshold value.
Further, in S1-2, the value range of n is：20-30；It is preferred that 20.
Further, in S1-2, table typical case frequency domain data will be connect and carry out glide filter, removal according to the priority of sampling window
Jump signal.
Further, S3 is specially：
When S3-1, electric energy meter normal work, the alternating voltage data in a cycle are acquired as sample, sample is carried out
Fast Fourier Transform (FFT) obtains its frequency domain data；
Even harmonic content more than several n times in S3-2, acquisition frequency domain data is as typical frequency domain data；
S3-3, several aforementioned typical frequency domain datas are carried out it is inverted take and handle again, it is special to obtain real-time voltage frequency domain
Value indicative；
S3-4, according to real-time voltage frequency domain character value and connect table threshold value, do not connect table threshold value degree of closeness distinguish whether
There is Dimmer interference.
Further, in S3-2, typical frequency domain data is subjected to glide filter, removal mutation according to the priority of sampling window
Signal.
Beneficial effects of the present invention：
The present invention can accurately capture the interference of Dimmer governors, on the basis of capture Dimmer governors interference,
The metering method of switching electricity in time, measures electricity, as much as possible using rated voltage and collected current effective value
Retrieve the loss of electric power enterprise.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Description of the drawings
Exemplary embodiment of the invention is described in more detail in conjunction with the accompanying drawings, it is of the invention above-mentioned and its
Its purpose, feature and advantage will be apparent, wherein, in exemplary embodiment of the invention, identical reference label
Typically represent same parts.
Fig. 1 is normal line voltage waveform.
Fig. 2 passes through one group of silicon-controlled voltage waveform for normal alternating current.
Fig. 3 passes through multigroup silicon-controlled voltage waveform for normal alternating current.
Fig. 4 Dimmer stealing circuits.
Fig. 5 is normal alternating current frequency domain data.
When Fig. 6 influences smaller for Dimmer governors, alternating current frequency domain data.
When Fig. 7 is affected for Dimmer governors, alternating current frequency domain data.
The method flow diagram of interference that Fig. 8 capture Dimmer governors generate.
Specific embodiment
The preferred embodiment of the present invention is more fully described below with reference to accompanying drawings.Although the present invention is shown in attached drawing
Preferred embodiment, however, it is to be appreciated that may be realized in various forms the present invention without the embodiment party that should be illustrated here
Formula is limited.
Under normal alternating current, line voltage waveform such as Fig. 1.If alternating current passes through Dimmer governors, there are two just for governor
Silicon-controlled, then waveform such as Fig. 2 of reverse parallel connection.Governor in the case of actual use is more complicated, is with multiple Group of Silicon Controlled Rectifier
Into then waveform such as Fig. 3.Dimmer governors are the input terminals for being connected on electric energy meter, as shown in figure 4, making the electricity that electric energy meter acquires
Pressure signal is distorted, and is reduced the collected voltage effective value of electric energy meter, is caused electric energy meter that can only be metered into part electricity, is lost
Partial electricity is difficult to weigh and remedy.And the load of electric energy meter output terminal accesses Dimmer governors due to not having, and can obtain
To the electric power completely without interference, so as to achieve the purpose that stealing.
The present invention provides a kind of methods of interference that accurate capture Dimmer governors generate, and acquire a cycle 64
Alternating voltage data simultaneously do Fast Fourier Transform (FFT), calculate its frequency domain data, and this method is chosen plurality of 20 times or more
Even harmonic content is analyzed as typical frequency domain data, to judge whether voltage sample is interfered by Dimmer governors,
So as to achieve the purpose that accurately to capture.
The present invention selects the even harmonic content of multiple 20 times or more as typical frequency domain data, secondary to m 2 × (10+n)
Frequency domain data progress is inverted to be taken and handles again.It is determined according to the distribution concentrated area of result (connect or do not connect Dimmer governors)
Whether one threshold value has Dimmer interference to distinguish.Comparing (Fig. 5~Fig. 7) by experimental data can find, normal alternating current
Typical frequency domain data differs 1 to 2 grades than the alternating current frequency domain data under the influence of Dimmer governor on the order of magnitude, this is just capture
Dimmer interference provides good identification.
While the input terminal in view of Dimmer governors to be connected in series to electric energy meter, gesture move through the mistake of rewiring
Journey will not suddenly occur in the operational process of electric energy meter, suddenly disappear.It can will be accidentally in typical frequency domain using filtering algorithm
The interference filtering of middle appearance makes capture Dimmer interference more accurate.
Various embodiments of the present invention are described above, above description is exemplary, and non-exclusive, and
It is not limited to disclosed each embodiment.In the case of without departing from the scope and spirit of illustrated each embodiment, for this skill
Many modifications and changes will be apparent from for the those of ordinary skill in art field.
Claims (7)
1. a kind of electricity anti-theft method for precisely capture Dimmer interference, which is characterized in that this method includes the following steps：
S1, using standard sine wave as check sample, in the case where electric energy meter connects Dimmer governors, acquire standard sine
Alternating voltage data in wave a cycle are handled, and acquisition connects governor voltage frequency domain character threshold value；
S2, using standard sine wave as check sample, in the case where electric energy meter does not connect Dimmer governors, according to aforementioned step
Rapid obtain does not connect governor voltage frequency domain character threshold value；
When S3, electric energy meter normal work, the alternating voltage real time data in a cycle is acquired, obtains real-time voltage frequency domain character
Value, according to real-time voltage frequency domain character value with connecing governor voltage frequency domain character threshold value, not connecing governor voltage frequency domain character threshold
Whether the degree of closeness differentiation of value has Dimmer interference.
2. the electricity anti-theft method according to claim 1 for precisely capture Dimmer interference, it is characterised in that in S1, one
There are 32,64 or 128 alternating voltage data in a period.
3. the electricity anti-theft method according to claim 1 for precisely capture Dimmer interference, it is characterised in that S1 is specific
For：
S1-1, using standard sine wave as check sample, in the case where electric energy meter connects Dimmer governors, acquisition standard is just
Alternating voltage data in string wave a cycle carry out Fast Fourier Transform (FFT) to sample and obtain its corresponding frequency domain as sample
Data；
Even harmonic content more than several n times in S1-2, the aforementioned sample frequency domain data of acquisition, which is used as, connects table typical case's frequency domain
Data；
S1-3, to it is aforementioned connect table typical case frequency domain data carry out it is inverted take and handle again, obtain connecing governor voltage frequency domain character
Value；
S1-4, it repeats step S1-1 to 1-3 several times, obtains several and connect governor voltage frequency domain character value, it is average to calculate it
Value is used as and connects governor voltage frequency domain character threshold value.
4. the electricity anti-theft method according to claim 3 for precisely capture Dimmer interference, it is characterised in that in S1-2,
The value range of n is：20-30；It is preferred that 20.
5. the electricity anti-theft method according to claim 3 for precisely capture Dimmer interference, it is characterised in that in S1-2,
Table typical case frequency domain data will be connect and carry out glide filter according to the priority of sampling window, remove jump signal.
6. the electricity anti-theft method according to claim 1 for precisely capture Dimmer interference, it is characterised in that S3 is specific
For：
When S3-1, electric energy meter normal work, the alternating voltage data in a cycle are acquired as sample, sample are carried out quick
Fourier transformation obtains its frequency domain data；
Even harmonic content more than several n times in S3-2, acquisition frequency domain data is as typical frequency domain data；
S3-3, several aforementioned typical frequency domain datas are carried out it is inverted take and handle again, obtain real-time voltage frequency domain character value；
S3-4, whether had with the degree of closeness differentiation for connecing table threshold value, not connecing table threshold value according to real-time voltage frequency domain character value
Dimmer is interfered.
7. the electricity anti-theft method according to claim 6 for precisely capture Dimmer interference, it is characterised in that in S3-2,
Typical frequency domain data is subjected to glide filter according to the priority of sampling window, removes jump signal.
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Cited By (4)
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| CN109030897A (en) * | 2018-09-20 | 2018-12-18 | 国网湖南省电力有限公司 | Stealing detection method based on Fourier transformation |
| CN110068716A (en) * | 2019-05-16 | 2019-07-30 | 宁波三星医疗电气股份有限公司 | Stealing detection method and device |
| CN111769651A (en) * | 2020-08-13 | 2020-10-13 | 广东电网有限责任公司 | Line loss analysis method and system for low-voltage power supply line |
| CN112305286A (en) * | 2020-10-11 | 2021-02-02 | 浙江晨泰科技股份有限公司 | Electricity meter capable of preventing electricity theft |
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| CN106841879A (en) * | 2017-03-29 | 2017-06-13 | 中国电力科学研究院 | The method that detection electric current metering secondary concatenates rectifier |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109030897A (en) * | 2018-09-20 | 2018-12-18 | 国网湖南省电力有限公司 | Stealing detection method based on Fourier transformation |
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| CN110068716A (en) * | 2019-05-16 | 2019-07-30 | 宁波三星医疗电气股份有限公司 | Stealing detection method and device |
| CN111769651A (en) * | 2020-08-13 | 2020-10-13 | 广东电网有限责任公司 | Line loss analysis method and system for low-voltage power supply line |
| CN111769651B (en) * | 2020-08-13 | 2022-04-19 | 广东电网有限责任公司 | Line loss analysis method and system for low-voltage power supply line |
| CN112305286A (en) * | 2020-10-11 | 2021-02-02 | 浙江晨泰科技股份有限公司 | Electricity meter capable of preventing electricity theft |
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