CN203084133U - Circuit capable of judging abnormalities in current loop of metering equipment - Google Patents
Circuit capable of judging abnormalities in current loop of metering equipment Download PDFInfo
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- CN203084133U CN203084133U CN 201220753475 CN201220753475U CN203084133U CN 203084133 U CN203084133 U CN 203084133U CN 201220753475 CN201220753475 CN 201220753475 CN 201220753475 U CN201220753475 U CN 201220753475U CN 203084133 U CN203084133 U CN 203084133U
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Abstract
The utility model relates to a circuit capable of judging abnormalities in the current loop of metering equipment. The circuit includes a current transformer; a secondary coil of the current transformer is connected with in parallel with oscillation capacitors; the secondary coil and the oscillation capacitors jointly form an LC oscillation circuit; an output end of an MCU outputs a variable signal; the variable signal is connected with the LC oscillation circuit and resonantly oscillates with the LC oscillation circuit; the signal which has been subjected to frequency selection of the LC oscillation circuit is amplified through a rectification amplifying circuit; the amplified signal is outputted to an A/D detection port of the MCU; a voltage value can be measured; and the MCU compares the measured voltage value with a pre-stored numerical value so as to judge whether abnormalities exist in the current loop or not. With the circuit of the utility model adopted, abnormalities in the circuit can be judged; and at the same time, the circuit has the advantages of simplicity, low cost and easiness in mass production.
Description
Technical field
The utility model relates to the circuit of judging on a kind of electric energy measuring equipment that current return is whether unusual.
Background technology
In order to hit to illegally occupy electric energy, be purpose not hand over or to pay tariff less, adopt illegal means not measure or measure less the behavior of electricity consumption.Present Application of Power Metering Instruments is in all its bearings all at progressively increase anti-stealing electricity function.The method of stealing also has multiple.
Present stealing electricity method commonly used has the stealing of replacing counter gear, joins sheet or the divider resistance of connecting, disconnected zero stealing on potential winding, change the current coil of short circuit measuring apparatus around measuring apparatus stealing more, transfer zero live wire stealing, off voltage.
The main points of changing counter gear are can exchange register with the electric energy meter of same producer, otherwise mechanical dimension can't be corresponding.And adopt this method stealing primary to close is exactly will unlatching table meter seal.But the Electric meter seal that present power supply department is adopted all is new-type seal, has good anti-electricity-theft performance.
Around the operation and than destructible stealing scene easily of measuring apparatus stealing more.
Transfer zero live wire stealing brings serious threat for user's safety utilization of electric power.
The off voltage connection sheet or the divider resistance of connecting on potential winding belong to more rudimentary stealing electricity method, and novel ordinary electric meter is at the inner short circuit connection of ammeter sheet.
Disconnected zero stealing need connect or establish certainly ground wire in addition, and at indoor installation back brake switch.
Change the current coil of short circuit measuring apparatus.Be shunting principle according to parallel circuit, most of electric current will from and connecting resistance pass through, current coil has only little electric current to pass through, and causes electric energy meter slow-speed by a certain percentage.
Existing a spot of metering outfit, occurred a kind of anti-electricity-theft and and the unusual circuit of judging of current return, but this circuit cost height, complicated, be inconvenient to produce in batches, to production and the check of the inconvenient CT of parameter request strictness of CT.
Summary of the invention
In order to overcome above-mentioned deficiency of the prior art, the utility model provides a kind of can judge the unusual and simple circuit of current return.
The technical scheme in the invention for solving the technical problem is:
The unusual decision circuitry of a kind of metering outfit current return, comprise current transformer, the parallel connection of secondary windings of described current transformer is connected with oscillating capacitance, the common formation of described secondary coil and oscillating capacitance one LC oscillatory circuit, the output terminal output variable signal of one MCU, described variable signal connects described LC oscillatory circuit and resonance takes place with it, amplify through the overcommutation amplifying circuit through the signal after the frequency-selecting of LC oscillatory circuit, and then the A/D that exports to MCU detects mouth and records magnitude of voltage, and described MCU compares the magnitude of voltage that records and judges whether current return exists unusually with the numerical value of preserving in advance.
As preferably, the rectification amplifying circuit adopts the TL082 chip.
In MCU, preserve the numerical value that obtains through the simulation abnormal conditions in advance, when circuit connects, the oscillating capacitance that the secondary coil of current transformer is connected in parallel with it constitutes a LC oscillatory circuit, MCU sends a variable signal, variable signal and LC oscillatory circuit generation resonant selecting frequency, through the process amplification again of the signal after the frequency-selecting of LC oscillatory circuit, become digital signal through analog to digital conversion, specifically record numerical value then, the numerical value that records is compared with the numerical value of preserving in advance, if it is unusual to find that numerical value takes place, then the decision circuitry loop is unusual, i.e. circuit loop second open circuit whether, second short circuit, first short circuit or other abnormality.The rectification amplifying circuit adopts the TL082 chip.
The beneficial effects of the utility model are: the utility model not only can the decision circuitry abnormal conditions, and circuit is simple, cost is low, be easy to produce in enormous quantities.
Description of drawings
Fig. 1 is an electrical block diagram of the present utility model.
Fig. 2 is a circuit diagram of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
As Fig. 1, shown in 2, the unusual decision circuitry of a kind of metering outfit current return, comprise current transformer CT, the parallel connection of secondary windings of current transformer CT is connected with oscillating capacitance C5, C6, the common formation of secondary coil and oscillating capacitance one LC oscillatory circuit 2, the output terminal output variable signal 1 of one MCU, variable signal 1 connects described LC oscillatory circuit and resonance takes place with it, amplify through overcommutation amplifying circuit 3 through the signal after the frequency-selecting of LC oscillatory circuit, and then the A/D that exports to MCU detects mouthfuls 4 and records magnitude of voltage, and described MCU compares the magnitude of voltage that records and judges whether current return exists unusually with the numerical value of preserving in advance.The rectification amplifying circuit adopts the TL082 chip.Variable signal is connected the reverse input end of TL082 with resistance R 2 through filtering capacitor C 3, be connected with building-out capacitor C1 between the reverse input end of TL082 and the output terminal, be used to improve circuit stability, reduce circuit output noise and restricting circuits bandwidth of operation, between the reverse input end of TL082 and output terminal, also be connected with diode VD1 and VD2, be used for rectification and improve circuit stability.The positive input of TL082 is by resistance R 4 ground connection.The output terminal of rectification amplifying circuit 3 also by R5 ground connection, is converted to voltage signal with current signal.
In MCU, preserve the numerical value that obtains through the simulation abnormal conditions in advance, when circuit connects, the oscillating capacitance that the secondary coil of current transformer is connected in parallel with it constitutes a LC oscillatory circuit, MCU sends a variable signal, variable signal and LC oscillatory circuit generation resonant selecting frequency, through the process amplification again of the signal after the frequency-selecting of LC oscillatory circuit, become digital signal through analog to digital conversion, specifically record numerical value then, the numerical value that records is compared with the numerical value of preserving in advance, if it is unusual to find that numerical value takes place, then the decision circuitry loop is unusual, i.e. circuit loop second open circuit whether, second short circuit, first short circuit or other abnormality.The rectification amplifying circuit adopts the TL082 chip.
The utility model not only can the decision circuitry abnormal conditions, and circuit is simple, cost is low, be easy to produce in enormous quantities.
Claims (2)
1. decision circuitry that the metering outfit current return is unusual, comprise current transformer, it is characterized in that: the parallel connection of secondary windings of described current transformer is connected with oscillating capacitance, the common formation of described secondary coil and oscillating capacitance one LC oscillatory circuit, the output terminal output variable signal of one MCU, described variable signal connects described LC oscillatory circuit and resonance takes place with it, amplify through the overcommutation amplifying circuit through the signal after the frequency-selecting of LC oscillatory circuit, and then the A/D that exports to MCU detects mouth and records magnitude of voltage, and described MCU compares the magnitude of voltage that records and judges whether current return exists unusually with the numerical value of preserving in advance.
2. the unusual decision circuitry of a kind of metering outfit current return according to claim 1 is characterized in that: described rectification amplifying circuit adopts the TL082 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220753475 CN203084133U (en) | 2012-12-19 | 2012-12-19 | Circuit capable of judging abnormalities in current loop of metering equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220753475 CN203084133U (en) | 2012-12-19 | 2012-12-19 | Circuit capable of judging abnormalities in current loop of metering equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203084133U true CN203084133U (en) | 2013-07-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220753475 Expired - Lifetime CN203084133U (en) | 2012-12-19 | 2012-12-19 | Circuit capable of judging abnormalities in current loop of metering equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203084133U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111308317A (en) * | 2019-12-16 | 2020-06-19 | 华南理工大学广州学院 | Method for detecting whether multivibrator circuit connection is correct or not through jigsaw |
-
2012
- 2012-12-19 CN CN 201220753475 patent/CN203084133U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111308317A (en) * | 2019-12-16 | 2020-06-19 | 华南理工大学广州学院 | Method for detecting whether multivibrator circuit connection is correct or not through jigsaw |
| CN111308317B (en) * | 2019-12-16 | 2022-08-16 | 华南理工大学广州学院 | Method for detecting whether multivibrator circuit connection is correct or not through jigsaw |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130724 |