CN103176097A - Intelligent electricity larceny preventing wireless alarming method - Google Patents
Intelligent electricity larceny preventing wireless alarming method Download PDFInfo
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- CN103176097A CN103176097A CN2012105334936A CN201210533493A CN103176097A CN 103176097 A CN103176097 A CN 103176097A CN 2012105334936 A CN2012105334936 A CN 2012105334936A CN 201210533493 A CN201210533493 A CN 201210533493A CN 103176097 A CN103176097 A CN 103176097A
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Abstract
The invention provides an intelligent electricity larceny preventing wireless alarming method. Short circuit conditions of a first side and a secondary side of a current transformer are judged via detecting circuit impedance of a CT (current transformer) secondary-side loop by a high-frequency signal, a voltage and current vector gram is calculated via fast Fourier transform, current, voltage phase dislocation or reversed electricity stealing behaviors are judged according to the vector gram, then alarming information is issued, a signal is output in coordination with an output port to a control center and a message is notified to related persons, so that emergency treatment in different degrees is performed, detection is accurate, and operation is convenient.
Description
Technical field
The present invention relates to a kind of electric power system electric quantity metering, stealing detection alarm method of being directed to.
Technical background
For a long time, the stealing problem is very stubborn problem of power supply enterprise always, is broadly divided into circuit stealing and the stealing of table meter, although power supply enterprise has strengthened measures of anti-stealing electricity from many aspects, but because electricity filching means emerges in an endless stream, bring great difficulty to work of electricity anti-stealing.The electricity filching behavior grievous injury legitimate rights and interests of power supply enterprise, upset and had a strong impact on the development of electric utility for the electricity consumption order normally, and along with the continuous upgrading of stealing technical intelligence, brought serious threat to safety utilization of electric power.This device can be realized auto-breaking when finding electricity filching behavior, and realizes uploading to control center and sending short messages warning.
Summary of the invention
The object of the invention is to avoid the deficiencies in the prior art and a kind of intelligent electricity anti-theft radio alarm method is provided.
Technical scheme of the present invention is: a kind of intelligent electricity anti-theft radio alarm method, 1) adopt ICL8038 to produce sinusoidal wave, TDA2822M carries out power amplification, generate the detectable signal of 50khz, through mutual inductor, high-frequency signal is added the secondary current side, low-pass filter after small-sized mutual inductor again, obtain the low frequency signal of 50hz, after the high-frequency signal of 50khz uses the MAX274 chip to carry out the bandpass filtering rectification, by ad change calculate wave-shape amplitude can judge the electric current secondary side normally, the state of open circuit, short circuit and primary side short circuit; 2) the per cycle sampling of the low frequency signal of 50hz 16 points, carry out Fast Fourier Transform (FFT), calculates vector plot, according to vector plot judgement stealing situation; 3) use single-chip microcomputer atmega64 gauge tap deciliter, communicate by letter with wireless module and realize main website and the warning of sending short messages.
The current method stealing is implemented open circuit or short circuit to the short circuit of CT primary side or secondary side circuit, is in fact all the circuit structure that has changed the CT secondary side circuit, has also namely changed the external impedance of electric energy measuring equipment.The key of identification current method stealing is accurately to distinguish the short circuit of CT primary side or secondary side is normal, the external impedance of electric energy measuring equipment in the situation of open circuit, short circuit.Send detectable signal by metering outfit to the CT secondary side, by measure detectable signal voltage all square amplitude come the impedance of measuring device external.Because the CT secondary side circuit is inductance component. be almost short circuit for low frequency signal.Therefore, distinguish the external impedance of metering outfit under three kinds of states of CT secondary side, detectable signal is necessary for high frequency.The high_frequency sine wave signal adopts the ICL8038 chip to produce, then carries out power amplification by the TDA2822M chip, generates the detectable signal of 50khz, and signal identification adopts the MAX274 chip to carry out bandpass filtering.
The present invention compared with prior art, beneficial effect is: check is accurately, and is easy to operate.
Description of drawings
Fig. 1 is control system circuit diagram of the present invention.
Embodiment
Describe embodiments of the invention in detail below in conjunction with accompanying drawing.
A kind of intelligent electricity anti-theft radio alarm method, 1) adopt ICL8038 to produce sinusoidal wave, TDA2822M carries out power amplification, generate the detectable signal of 50khz, through mutual inductor, high-frequency signal is added the secondary current side, then after small-sized mutual inductor low-pass filter, obtain the low frequency signal of 50hz, after the high-frequency signal of 50khz uses the MAX274 chip to carry out the bandpass filtering rectification, by ad change calculate wave-shape amplitude can judge the electric current secondary side normally, the state of open circuit, short circuit and primary side short circuit; 2) the per cycle sampling of the low frequency signal of 50hz 16 points, carry out Fast Fourier Transform (FFT), calculates vector plot, according to vector plot judgement stealing situation; 3) use single-chip microcomputer atmega64 gauge tap deciliter, communicate by letter with wireless module and realize main website and the warning of sending short messages.
As to scheme b3b4 be the sinusoidal wave input end of 50kHz, and b5b6 is all square amplitude detection receiving ends of 50kHz sine wave.For avoiding high-frequency signal and the mutual interference of 50Hz power frequency component phase, be provided with low-pass filter circuit at the b1b2 end, be provided with high-pass filtering circuit at b3b4, b5b6 end.When current return normal (A, B do not open a way at two places, not short circuit), 50kHz firm power sine wave is by the input of b3b4 end, and at winding L 1l, L21, L31, and CT secondary side winding T is upper forms induction by the current transducer magnetic core.Much larger than winding L 1l, L21, L31, the high frequency signal amplitude of L1l, L21, the upper induction of L31 will be much smaller than the induced voltage on T due to winding T impedance, thereby the b5b6 end will receive a high-frequency signal than small magnitude, and it is normal that this amplitude is designated as V.When short circuit of current loop (being A, B short circuit), 50kHz firm power sine wave is by the input of b3b4 end, only carry out power division by the current transducer magnetic core on winding L 1l, L21, L31, the high-frequency signal amplitude of L1l, L21, the upper induction of L31 will be obviously greater than the amplitude under the normal condition of loop, thereby the b5b6 end will be received a high-frequency signal than amplitude, and this amplitude is designated as the V short circuit.When current return open circuit (being A or B open circuit), 50kHz firm power sine wave is by the input of b3b4 end, can't be on winding L 31 the induction of high frequency signal, thereby the high-frequency signal amplitude of receiving at the b5b6 end is almost 0, this amplitude is designated as the V open circuit.By above analysis as can be known, V open circuit＜normal＜short circuit.By setting two voltage thresholds, be judged as open circuit when voltage V detects＜0 when the b5b6 end detects, when V detects〉be judged as short circuit during vs.
Calculate the electric current and voltage vector plot by Fast Fourier Transform (FFT), according to vector plot judgement electric current, voltage misphase or reverse electricity filching behavior.
Claims (1)
1. an intelligent electricity anti-theft radio alarm method, is characterized in that
1) adopt ICL8038 to produce sinusoidal wave, TDA2822M carries out power amplification, generate the detectable signal of 50khz, through mutual inductor, high-frequency signal is added the secondary current side, low-pass filter after small-sized mutual inductor again, obtain the low frequency signal of 50hz, after the high-frequency signal of 50khz uses the MAX274 chip to carry out the bandpass filtering rectification, by ad change calculate wave-shape amplitude can judge the electric current secondary side normally, the state of open circuit, short circuit and primary side short circuit;
2) the per cycle sampling of the low frequency signal of 50hz 16 points, carry out Fast Fourier Transform (FFT), calculates vector plot, according to vector plot judgement stealing situation;
3) use single-chip microcomputer atmega64 gauge tap deciliter, communicate by letter with wireless module and realize main website and the warning of sending short messages.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105334936A CN103176097A (en) | 2012-12-12 | 2012-12-12 | Intelligent electricity larceny preventing wireless alarming method |
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| CN2012105334936A CN103176097A (en) | 2012-12-12 | 2012-12-12 | Intelligent electricity larceny preventing wireless alarming method |
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| CN103176097A true CN103176097A (en) | 2013-06-26 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104614565A (en) * | 2015-02-02 | 2015-05-13 | 国家电网公司 | Method for determining abnormal short circuit and electricity stealing of current incoming line loop of electric energy meter |
| CN104764953A (en) * | 2015-03-20 | 2015-07-08 | 保定市暄威电力设备科技有限公司 | Testing method, device and system for transformer winding |
| CN107015095A (en) * | 2017-03-23 | 2017-08-04 | 中国电力科学研究院 | A kind of method and system that secondary loop of mutual inductor state is judged based on Transient Method |
| CN108152784A (en) * | 2017-12-29 | 2018-06-12 | 江苏林洋能源股份有限公司 | A kind of circuit and method that external CT states are detected for mutual inductor access electric energy meter |
| 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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| CN1632606A (en) * | 2004-12-29 | 2005-06-29 | 重庆龙源科技产业发展有限公司 | Current transformer failure metering and electric larceny proof real-time on-line detection method and apparatus |
| CN202102624U (en) * | 2011-06-13 | 2012-01-04 | 安徽省电力公司安庆供电公司 | Integral experiment system for preventing electricity fraudulent use |
| CN102435804A (en) * | 2011-10-11 | 2012-05-02 | 天津市电力公司 | Method and wireless detection module for detecting electricity stealing of wireless remote control device based on intelligent electric energy meter |
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| JP3598710B2 (en) * | 1997-02-19 | 2004-12-08 | 株式会社明電舎 | Power system characteristic measurement method |
| US20030033119A1 (en) * | 2001-08-07 | 2003-02-13 | Seung-Man Noh | Pole transformer load monitoring system using wireless internet network |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104614565A (en) * | 2015-02-02 | 2015-05-13 | 国家电网公司 | Method for determining abnormal short circuit and electricity stealing of current incoming line loop of electric energy meter |
| CN104764953A (en) * | 2015-03-20 | 2015-07-08 | 保定市暄威电力设备科技有限公司 | Testing method, device and system for transformer winding |
| CN107015095A (en) * | 2017-03-23 | 2017-08-04 | 中国电力科学研究院 | A kind of method and system that secondary loop of mutual inductor state is judged based on Transient Method |
| CN108152784A (en) * | 2017-12-29 | 2018-06-12 | 江苏林洋能源股份有限公司 | A kind of circuit and method that external CT states are detected for mutual inductor access electric energy meter |
| 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 |
| CN109030897B (en) * | 2018-09-20 | 2020-12-04 | 国网湖南省电力有限公司 | Fourier transform-based electricity stealing detection method |
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Application publication date: 20130626 |