CN202886438U - Detecting device for preventing current from being stolen by means of bypass or open circuit of current input end - Google Patents
Detecting device for preventing current from being stolen by means of bypass or open circuit of current input end Download PDFInfo
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- CN202886438U CN202886438U CN 201220642691 CN201220642691U CN202886438U CN 202886438 U CN202886438 U CN 202886438U CN 201220642691 CN201220642691 CN 201220642691 CN 201220642691 U CN201220642691 U CN 201220642691U CN 202886438 U CN202886438 U CN 202886438U
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Abstract
The utility model relates to a detecting device for preventing current from being stolen by means of bypass or open circuit of a current input end. The detecting device for preventing current from being stolen comprises a singlechip, a signal amplifying unit, a three-phase current mutual inductor, a multi-path switch unit, a signal processing unit and a signal comparison unit, and can effectively solve the problem that a common ammeter at present cannot detect electricity stealing caused by bypass or open circuit of the current input end. A primary terminal of the three-phase current mutual inductor and a secondary terminal of the current mutual inductor out of the ammeter are connected directly, and the direct detection and real-time monitoring are convenient; a three-phase integrated-type current mutual inductor is selected, the cost is lowered, and the space is saved, and the problem that the common ammeter at present can not detect detect electricity stealing caused by bypass or open circuit of the current input end can be solved effectively.
Description
Technical field
The utility model relates to a kind of detection device for preventing from fraudulent, and specifically the pick-up unit of a kind of anti-electric current input bypass or open circuit stealing belongs to anti-electricity-theft detection technique field.
Background technology
Stealing refers to walk around electric energy meter or it was lost efficacy by certain mode, thereby reaches the purpose of escaping the payment electricity charge.At present, main stealing user progressively turns to industrial power stealing by the domestic lighting stealing, and electricity filching means also turns to hidden technicalization stealing by the stealing of obvious destruction structure.Wherein one of more common stealing mode is electric current input bypass or open circuit stealing mode, current input terminal bypass or open circuit, be by acquire shunting circuit or directly the input of disconnected power down stream cause the metering current loop fault, make the interior current transformer no current of table or only pass through the part electric current, thereby cause disregarding or few quantity calculation.
The utility model content
Technical problem to be solved in the utility model is the technical matters that affects the normal metering of three phases electronic energy meter that electric current is inputted bypass or the stealing of opening a way brings in the prior art, thereby the pick-up unit of a kind of anti-electric current input bypass or the stealing of opening a way is provided.
For solving the problems of the technologies described above, the utility model is achieved through the following technical solutions:
The pick-up unit of a kind of anti-electric current input bypass or open circuit stealing comprises:
Threephase current transformer, the secondary side of each mutually described threephase current transformer include three-phase secondary detection coil, and each mutually described secondary detection coil includes the first magnetic test coil and two secondary coils of the second magnetic test coil; The secondary terminals of the current transformer that the once end of described threephase current transformer and three phases electronic energy meter are outer is connected to form a closed-loop path, and the once end of the current transformer in described three phases electronic energy meter is when having electric current normally to input, and the first magnetic test coil is sensed voltage signal and output;
Single-chip microcomputer receives the described voltage signal of described the first magnetic test coil output, and at described voltage signal during less than a threshold value, output periodical high-frequency square-wave signal;
Signal amplification unit receives the described periodical high-frequency square-wave signal that described single-chip microcomputer sends and amplifies rear output;
Described the second magnetic test coil receives the described periodical high-frequency square-wave signal of described signal amplification unit output and produces a magnetic field, and described the first magnetic test coil induces a voltage signal and the output in described magnetic field;
Multi-channel switch module, the control signal that receives described single-chip microcomputer output selects the voltage signal of mutually described the first magnetic test coil output in the threephase current transformer as input signal;
Signal processing unit receives described input signal, and will export after the high-pass filtering of described input signal process, signal amplification, signal maintenance and the wave shaping;
The signal comparing unit receives the signal that described signal processing unit is exported, and the two-way analog threshold voltage of described signal and the output of described single-chip microcomputer D/A port is compared, and the two-way comparative result is exported;
Described single-chip microcomputer receives the two-way comparative result that described signal comparing unit is exported, and is judged as bypass when described two-way comparative result is high level; When being low level, described two-way comparative result is judged as open circuit; Otherwise be judged as normal.
Described multi-channel switch module is the CD74HC4052 chip.
Carrying out signal via unipolarity integrated transporting discharging chip LM358D in the described signal processing unit amplifies.
Described signal comparing unit is the LM2903M chip.
Also comprise an alarm, described alarm links to each other with described single-chip microcomputer, judges at described single-chip microcomputer and sends alerting signal when having electric current input bypass or opening a way electricity filching behavior.
Described single-chip microcomputer also comprises a communication unit, and the judged result that described communication unit is used for described single-chip microcomputer is made sends to the power monitoring center.
Described communication unit is radio communication unit.
Described signal amplification unit comprises,
The first resistance, the described periodical high-frequency square-wave signal of a termination of described the first resistance, the other end ground connection of described the first resistance;
The second resistance, an end of described the second resistance links to each other with described high-frequency square-wave signal input end;
Triode, the base stage of described triode links to each other with the end that described the second resistance directly is not connected with described high-frequency square-wave signal input end; The collector of described triode links to each other with an end of the 3rd resistance; The other end of described the 3rd resistance links to each other with power input; The grounded emitter of described triode.
Technique scheme of the present utility model has the following advantages compared to existing technology:
The pick-up unit of described anti-electric current input bypass or open circuit stealing comprises that single-chip microcomputer, signal amplification unit, threephase current transformer, multi-channel switch module, signal processing unit, signal comparing unit can solve the difficult problem that at present general ammeter is difficult to detect to electric current input bypass or open circuit stealing effectively.
Described single-chip microcomputer is the single-chip microcomputer of μ PD78F1166AGC, can reduce the power of whole pick-up unit, energy-conserving and environment-protective.
The once end of described threephase current transformer is direct-connected with the secondary terminals of off-balancesheet current transformer, makes things convenient for direct-detection, Real Time Monitoring.
The pick-up unit of anti-electric current input bypass of the present utility model or open circuit stealing is selected the Integral three-phase current transformer, reduces cost, saves the space.
An alarm is set, links to each other with described single-chip microcomputer, when described single-chip microcomputer judgement exists electric current input bypass or open circuit, send alerting signal, realize Real Time Monitoring.
By a communication unit is set, link to each other with described single-chip microcomputer, the judged result that described single-chip microcomputer is made sends to the power monitoring center, the real-time communication at realization and power monitoring center, the function of realization remote monitoring.
Description of drawings
For content of the present utility model is more likely to be clearly understood, below in conjunction with accompanying drawing, the utility model is described in further detail, wherein,
Fig. 1 is the structural representation of the pick-up unit of the anti-electric current input bypass of an embodiment of the utility model or the stealing of opening a way;
Fig. 2 is the electrical block diagram of the signal amplification unit of an embodiment of the utility model.
Embodiment
Referring to shown in Figure 1, as the anti-electric current input bypass of an embodiment of the utility model or the pick-up unit of open circuit stealing, it comprises
The Integral three-phase current transformer, the secondary side of described each phase of Integral three-phase current transformer includes three-phase secondary detection coil, and each mutually described secondary detection coil includes the first magnetic test coil (detection 1 among Fig. 1) and two secondary coils of the second magnetic test coil (detection 2 among Fig. 1); The secondary terminals of the current transformer that the once end of described Integral three-phase current transformer and three phases electronic energy meter are outer is connected to form a closed-loop path, when the once end of the current transformer in the described three phases electronic energy meter had electric current normally to input, the first magnetic test coil was sensed voltage signal and is exported as sampled signal; The pick-up unit of anti-electric current input bypass of the present utility model or open circuit stealing is selected the Integral three-phase current transformer, reduces cost, saves the space;
Single-chip microcomputer receives the described voltage signal of described the first magnetic test coil output, and at described voltage signal during less than a threshold value;
Signal amplification unit receives the described periodical high-frequency square-wave signal that described single-chip microcomputer sends and amplifies rear output;
Described the second magnetic test coil receives the described periodical high-frequency square-wave signal of described signal amplification unit output, and described the second magnetic test coil produces a magnetic field, and described magnetic field induces a voltage signal and output through described the first magnetic test coil;
Multi-channel switch module, the control signal that receives described single-chip microcomputer output selects the voltage signal of mutually described the first magnetic test coil output in the threephase current transformer as input signal; As a specific embodiment, described multi-channel switch module is the CD74HC4052 chip;
Signal processing unit, with described multi-channel switch module select a road as input signal, through high-pass filtering, signal amplify, waveform keeps and wave shaping output; As a specific embodiment, carry out signal via unipolarity integrated transporting discharging chip LM358D in the described signal processing unit and amplify;
The signal comparing unit receives the signal that described signal processing unit is exported, and the signal of described signal processing unit input and the two-way analog threshold voltage of described single-chip microcomputer D/A port output are compared, and the two-way comparative result is exported; As a specific embodiment, described signal comparing unit is the LM2903M chip;
Described single-chip microcomputer receives the two-way comparative result that described signal comparing unit is exported, and judges that when described two-way comparative result is high level this circuitry phase is bypass; When being low level, described two-way comparative result judges that this circuitry phase is open circuit; Otherwise judge that this circuitry phase is for normal; So far, finish a circuitry phase open circuit, bypass and normal judgement; Judge such as needs whether other circuitry phase exists bypass or open circuit, only need to select the multidiameter option switch unit to select the first magnetic test coil of this phase to judge successively as input signal and get final product; Out of phase circuit has different threshold values.
As the circuit diagram of the described wave generator circuit of a specific embodiment of the utility model, referring to shown in Figure 2, described wave generator circuit comprises:
The first resistance R 1, the described periodical high-frequency square-wave signal of a termination of described the first resistance R 1, the other end ground connection of described the first resistance R 1;
The second resistance R 2, an end of described the second resistance R 2 links to each other with described high-frequency square-wave signal input end;
Triode VT, the base stage of described triode VT links to each other with the end that described the second resistance R 2 directly is not connected with described high-frequency square-wave signal input end; The collector of described triode VT links to each other with an end of the 3rd resistance R 3; The other end of described the 3rd resistance R 3 links to each other with power input; The grounded emitter of described triode VT.
As a specific embodiment of the present utility model, described single-chip microcomputer is the single-chip microcomputer of μ PD78F1166AGC, can reduce the power of whole pick-up unit, energy-conserving and environment-protective.
As a specific embodiment of the present utility model, described Integral three-phase current transformer can be a plurality of independent current transformer of the prior art and replaces, and other can realize the purpose of this utility model equally with above-mentioned embodiment.
As the anti-electric current input bypass of a specific embodiment of the present utility model or the pick-up unit of open circuit stealing, an alarm also is set, link to each other with described single-chip microcomputer, when existing electric current input bypass or open circuit, described single-chip microcomputer judgement sends alerting signal, realize Real Time Monitoring, other can realize the purpose of this utility model equally with above-mentioned embodiment.
Obviously, above-described embodiment only is for example clearly is described, and is not the restriction 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 all embodiments exhaustive.And the apparent variation of being extended out thus or change still are among the protection domain of the present utility model.
Claims (8)
1. an anti-electric current is inputted bypass or the pick-up unit of the stealing of opening a way, and it is characterized in that, comprising:
Threephase current transformer, the secondary side of each mutually described threephase current transformer include three-phase secondary detection coil, and each mutually described secondary detection coil includes the first magnetic test coil and two secondary coils of the second magnetic test coil; The secondary terminals of the current transformer that the once end of described threephase current transformer and three phases electronic energy meter are outer is connected to form a closed-loop path, and the once end of the current transformer in described three phases electronic energy meter is when having electric current normally to input, and the first magnetic test coil is sensed voltage signal and output;
Single-chip microcomputer receives the described voltage signal of described the first magnetic test coil output, and at described voltage signal during less than a threshold value, output periodical high-frequency square-wave signal;
Signal amplification unit receives the described periodical high-frequency square-wave signal that described single-chip microcomputer sends and amplifies rear output;
Described the second magnetic test coil receives the described periodical high-frequency square-wave signal of described signal amplification unit output and produces a magnetic field, and described the first magnetic test coil induces a voltage signal and the output in described magnetic field;
Multi-channel switch module, the control signal that receives described single-chip microcomputer output selects the voltage signal of mutually described the first magnetic test coil output in the threephase current transformer as input signal;
Signal processing unit receives described input signal, and will export after the high-pass filtering of described input signal process, signal amplification, signal maintenance and the wave shaping;
The signal comparing unit receives the signal that described signal processing unit is exported, and the two-way analog threshold voltage of described signal and the output of described single-chip microcomputer D/A port is compared, and the two-way comparative result is exported;
Described single-chip microcomputer receives the two-way comparative result that described signal comparing unit is exported, and is judged as bypass when described two-way comparative result is high level; When being low level, described two-way comparative result is judged as open circuit; Otherwise be judged as normal.
2. the pick-up unit of anti-electric current input bypass according to claim 1 or open circuit stealing is characterized in that described multi-channel switch module is the CD74HC4052 chip.
3. the pick-up unit of anti-electric current input bypass according to claim 2 or open circuit stealing is characterized in that, carries out signal via unipolarity integrated transporting discharging chip LM358D in the described signal processing unit and amplifies.
4. the pick-up unit of anti-electric current input bypass according to claim 3 or open circuit stealing is characterized in that described signal comparing unit is the LM2903M chip.
5. a kind of anti-electric current according to claim 4 is inputted the pick-up unit of bypass or open circuit stealing, it is characterized in that, also comprise an alarm, described alarm links to each other with described single-chip microcomputer, judges at described single-chip microcomputer and sends alerting signal when having electric current input bypass or opening a way electricity filching behavior.
6. a kind of anti-electric current according to claim 5 is inputted the pick-up unit of bypass or open circuit stealing, it is characterized in that, described single-chip microcomputer also comprises a communication unit, and the judged result that described communication unit is used for described single-chip microcomputer is made sends to the power monitoring center.
7. anti-electric current according to claim 6 is inputted the pick-up unit of bypass or open circuit stealing, and it is characterized in that: described communication unit is radio communication unit.
8. the pick-up unit of arbitrary described anti-electric current input bypass or open circuit stealing according to claim 1-7 is characterized in that: described signal amplification unit comprises,
The first resistance, the described periodical high-frequency square-wave signal of a termination of described the first resistance, the other end ground connection of described the first resistance;
The second resistance, an end of described the second resistance links to each other with described high-frequency square-wave signal input end;
Triode, the base stage of described triode links to each other with the end that described the second resistance directly is not connected with described high-frequency square-wave signal input end; The collector of described triode links to each other with an end of the 3rd resistance; The other end of described the 3rd resistance links to each other with power input; The grounded emitter of described triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220642691 CN202886438U (en) | 2012-11-29 | 2012-11-29 | Detecting device for preventing current from being stolen by means of bypass or open circuit of current input end |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220642691 CN202886438U (en) | 2012-11-29 | 2012-11-29 | Detecting device for preventing current from being stolen by means of bypass or open circuit of current input end |
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| CN202886438U true CN202886438U (en) | 2013-04-17 |
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| CN 201220642691 Expired - Lifetime CN202886438U (en) | 2012-11-29 | 2012-11-29 | Detecting device for preventing current from being stolen by means of bypass or open circuit of current input end |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103267893A (en) * | 2013-06-04 | 2013-08-28 | 长沙高升电子电器科技有限公司 | Intelligent electric meter with balanced power distribution |
| CN103472276A (en) * | 2013-09-16 | 2013-12-25 | 万高(杭州)科技有限公司 | Electric energy meter electricity stealing judgment method and electric energy measurement system with same |
-
2012
- 2012-11-29 CN CN 201220642691 patent/CN202886438U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103267893A (en) * | 2013-06-04 | 2013-08-28 | 长沙高升电子电器科技有限公司 | Intelligent electric meter with balanced power distribution |
| CN103267893B (en) * | 2013-06-04 | 2015-10-28 | 长沙高升电子电器科技有限公司 | Balanced distribution intelligent electric meter |
| CN103472276A (en) * | 2013-09-16 | 2013-12-25 | 万高(杭州)科技有限公司 | Electric energy meter electricity stealing judgment method and electric energy measurement system with same |
| CN103472276B (en) * | 2013-09-16 | 2016-03-23 | 万高(杭州)科技有限公司 | Electric energy meter stealing determination methods and utilize the electric energy metered system of the method |
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| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
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Granted publication date: 20130417 |