CN112098712A - Electricity larceny prevention method - Google Patents
Electricity larceny prevention method Download PDFInfo
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- CN112098712A CN112098712A CN202010737224.6A CN202010737224A CN112098712A CN 112098712 A CN112098712 A CN 112098712A CN 202010737224 A CN202010737224 A CN 202010737224A CN 112098712 A CN112098712 A CN 112098712A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/061—Details of electronic electricity meters
- G01R22/066—Arrangements for avoiding or indicating fraudulent use
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
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Abstract
The invention relates to an electricity larceny prevention method, which comprises the following steps that S1, when an ammeter enters a power failure program, direct current bias of a current ADC channel, current calculation gain Ki and a high-frequency constant Hfconst accumulated by electric energy are taken out from a memory for standby; s2, starting an internal high-frequency clock at intervals T, and detecting the load grounding electricity stealing; s3, opening a full-voltage-loss NVM (non volatile memory) metering module and a direct current ADC (analog to digital converter) channel of the metering chip, closing the high-pass filter, writing the direct current offset calibration value of the current ADC channel into an NVM- > DCOS register, acquiring a sampling value, and converting the sampling value into a current effective value Ix; s4, judging the effective value Ix and the threshold value It of the current, if the effective value Ix is larger than the threshold value It, switching to a correction metering mode to calculate the power value, writing the power value into a D2FP0 register of the NVM metering module, and accumulating the energy; otherwise, the NVM metering module is closed without electricity stealing; and S5, switching the clock to a low-frequency clock to execute other tasks after the detection is finished. The invention improves the sensitivity of electricity stealing detection and has low power consumption.
Description
Technical Field
The invention relates to the technical field of electric energy meters, in particular to an electricity larceny prevention method.
Background
In the electricity utilization process, electricity stealing behaviors occur occasionally, and load grounding electricity stealing is a common electricity stealing mode. In the mode, the zero line of the house is cut off, the electric energy meter stops metering, but the household electric appliance is connected with the live wire and the ground and still can work, the generated electric energy consumption is not metered, and the loss is brought to the power station.
In order to solve the problem, a current loop is usually connected to a CT to supply power to the electric energy meter and perform detection, that is, after the electric energy meter does not work, if the current loop still has current and reaches a certain threshold, the electric energy meter can be supplied with power, and then a metering function is started. However, the mode can ensure the power supply of the electric energy meter only when the current is larger, and the electricity stealing prevention metering is started, so that the sensitivity is low.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a method for preventing electricity theft with high sensitivity of electricity theft detection and low power consumption.
In order to achieve the purpose, the technical scheme of the invention is as follows: an electricity larceny prevention method is characterized in that: the method comprises the following steps of,
s1, when the ammeter enters a power-down program, taking out the direct current bias of the current ADC channel, the current calculation gain Ki and a high-frequency constant Hfconst of electric energy accumulation from the memory for standby;
s2, starting an internal high-frequency clock at intervals T, and detecting the load grounding electricity stealing;
s3, opening a full-voltage-loss NVM (non volatile memory) metering module and a direct current ADC (analog to digital converter) channel of the metering chip, closing the high-pass filter, writing the direct current offset calibration value of the current ADC channel into an NVM- > DCOS register, acquiring a sampling value, and converting the sampling value into a current effective value Ix;
s4, judging the effective value Ix and the threshold value It of the current, if the effective value Ix is larger than the threshold value It, switching to a correction metering mode to calculate the power value, writing the power value into a D2FP0 register of the NVM metering module, and accumulating the energy; otherwise, the NVM metering module is closed without electricity stealing;
and S5, switching the clock to a low-frequency clock to execute other tasks after the detection is finished.
Further, the method for acquiring the dc offset calibration value in step S3 is as follows:
1) in the meter calibration process, the meter is in no-load, the digital high-pass filter of the measurement channel is closed, and the gain IAGAIN of the current channel is set to be 0;
2) turning on a power supply of an ADC channel, enabling an APB clock of the NVM metering module, and turning on an internal RC clock;
3) setting NVM- > DCOS to be 0, starting NVM metering module measurement, and starting DCOS automatic correction function;
4) and after waiting for t seconds, reading the NVM- > LS _ DCOS register value and storing the value in the EEPROM as the DC offset correction value of the NVM metering module.
Further, the method for accumulating energy in S4 is as follows:
and calculating power P (Ix) Un, converting the power into a register value, and writing the register value into a power constant register of the electric energy integration module for electric energy accumulation, wherein Un is standard voltage, and Ix is current effective value.
Further, in the S4, the corrected metering mode is to perform power calculation according to the standard voltage Un, the current effective value Ix, and the power factor 1.0.
Further, the step S4 includes, while performing energy accumulation, synchronously turning on a pulse output function of the metering chip to automatically drive the LED to perform pulse output.
Further, the model of the metering chip is RN 8213B.
Further, the value of T is 10 s.
Further, the value of the threshold It is 40 mA.
Further, the value of t is 2.28S.
Further, when the method adopts two channels for dc offset calibration in S3, the method includes repeating steps 2) to 4).
Compared with the prior art, the invention has the advantages that: by adopting the method, the average working current of the battery of the electric energy meter in the power-down mode can be reduced to be within 40uA without additionally adding a hardware circuit, so that low-power consumption metering is realized; meanwhile, by adopting the method, the metering can be started when the electricity stealing current reaches above the starting current, so that the electricity stealing detection sensitivity is greatly improved.
Drawings
Fig. 1 is a flowchart of a corresponding electricity stealing prevention method in the present application.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
Fig. 1 is a flow chart of a corresponding electricity stealing prevention method of the present invention, a metering scheme of the method samples a metering chip RN8213, and uses a self-contained full-voltage-loss NVM metering module to detect electricity stealing, and as shown in the figure, the electricity stealing prevention method specifically comprises the following processing flows:
s1, when the ammeter enters a power-down program, taking out the direct current bias of the current ADC channel, the current calculation gain Ki and a high-frequency constant Hfconst of electric energy accumulation from the memory for standby;
s2, starting an internal high-frequency clock at intervals T, and detecting the load grounding electricity stealing; here, the value of T is 10s, and obviously, T may also be selected from other values, which are specifically determined according to actual needs;
s3, opening a full-voltage-loss NVM (non volatile memory) metering module and a direct current ADC (analog to digital converter) channel of the metering chip, closing the high-pass filter, writing the direct current offset calibration value of the current ADC channel into an NVM- > DCOS register, acquiring a sampling value, and converting the sampling value into a current effective value Ix;
s4, judging the effective value Ix and the threshold value It of the current, if the effective value Ix is larger than the threshold value It, switching to a correction metering mode to calculate the power value, writing the power value into a D2FP0 register of the NVM metering module, and accumulating the energy; otherwise, the NVM metering module is closed without electricity stealing; in the present application, the value of the threshold It is 40 mA;
and S5, switching the clock to a low-frequency clock to execute other tasks after the detection is finished.
Because the high-pass filter is closed in the step S3, the influence of the DC offset DCOS is large during sampling, the offset range is different from 100 to 1000mA, and in order to reduce the influence caused by the DC offset, the DC offset calibration must be carried out, namely, during electricity stealing detection, a calibration value is written in first, and then a sampling value is obtained. In the method, the DCOS calibration is executed in the process of calibrating the meter, and is coincided with the time for waiting the power supply equipment to be stable, so that no extra time is occupied. Specifically, the dc offset calibration method is as follows:
1) in the meter calibration process, the meter is in no-load, the digital high-pass filter of the measurement channel is closed, and the gain IAGAIN of the current channel is set to be 0;
2) turning on a power supply of an ADC channel, enabling an APB clock of the NVM metering module, and turning on an internal RC clock;
3) setting NVM- > DCOS to be 0, starting NVM metering module measurement, and starting DCOS automatic correction function;
4) and after waiting for t seconds, reading the NVM- > LS _ DCOS register value and storing the value in the EEPROM as the DC offset correction value of the NVM metering module. Of course, if two channels are adopted in the calibration table, the steps 2) to 4) need to be repeated. This t is preferably 2.28S in the present process, depending on the actual requirements.
When the energy accumulation of the S4 is executed, if the electric energy pulse needs to be output, the method further comprises the step of synchronously starting the pulse output function of the metering chip so as to automatically drive the LED to output the pulse. Specifically, in this embodiment, the method for accumulating energy in S4 is as follows:
and calculating power P (Ix) Un, converting the power into a register value, and writing the register value into a power constant register of the electric energy integration module for electric energy accumulation, wherein Un is standard voltage, and Ix is current effective value. Correspondingly, in S4, the corrected metering mode is to perform power calculation according to the standard voltage Un, the current effective value Ix, and the power factor 1.0.
By adopting the method, the average working current of the battery of the electric energy meter in the power-down mode can be reduced to be within 40uA without additionally adding a hardware circuit, the metering can be maintained by using the 3.6V battery in the electric energy meter, the low-power metering is realized, and the detection of load grounding electricity stealing is carried out with low power consumption; meanwhile, by adopting the method, the metering can be started when the electricity stealing current reaches above the starting current, so that the electricity stealing detection sensitivity is greatly improved.
While embodiments of the invention have been shown and described, it will be understood by those skilled in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. An electricity larceny prevention method is characterized in that: the method comprises the following steps of,
s1, when the ammeter enters a power-down program, taking out the direct current bias of the current ADC channel, the current calculation gain Ki and a high-frequency constant Hfconst of electric energy accumulation from the memory for standby;
s2, starting an internal high-frequency clock at intervals T, and detecting the load grounding electricity stealing;
s3, opening a full-voltage-loss NVM (non volatile memory) metering module and a direct current ADC (analog to digital converter) channel of the metering chip, closing the high-pass filter, writing the direct current offset calibration value of the current ADC channel into an NVM- > DCOS register, acquiring a sampling value, and converting the sampling value into a current effective value Ix;
s4, judging the effective value Ix and the threshold value It of the current, if the effective value Ix is larger than the threshold value It, switching to a correction metering mode to calculate the power value, writing the power value into a D2FP0 register of the NVM metering module, and accumulating the energy; otherwise, the NVM metering module is closed without electricity stealing;
and S5, switching the clock to a low-frequency clock to execute other tasks after the detection is finished.
2. The method of claim 1, further comprising: the method for obtaining the dc offset calibration value in step S3 is as follows,
1) in the meter calibration process, the meter is in no-load, the digital high-pass filter of the measurement channel is closed, and the gain IAGAIN of the current channel is set to be 0;
2) turning on a power supply of an ADC channel, enabling an APB clock of the NVM metering module, and turning on an internal RC clock;
3) setting NVM- > DCOS to be 0, starting NVM metering module measurement, and starting DCOS automatic correction function;
4) and after waiting for t seconds, reading the NVM- > LS _ DCOS register value and storing the value in the EEPROM as the DC offset correction value of the NVM metering module.
3. The method of claim 1, further comprising: the method of accumulating energy in S4 is as follows,
and calculating power P (Ix) Un, converting the power into a register value, and writing the register value into a power constant register of the electric energy integration module for electric energy accumulation, wherein Un is standard voltage, and Ix is current effective value.
4. The method of claim 1, further comprising:
and in the S4, the correction metering mode is that power calculation is carried out according to the standard voltage Un, the current effective value Ix and the power factor 1.0.
5. The method of claim 1, further comprising:
and in the step S4, the method further includes, while performing energy accumulation, synchronously turning on a pulse output function of the metering chip to automatically drive the LED to perform pulse output.
6. The method of claim 1, further comprising:
the model of the metering chip is RN 8213B.
7. The method of claim 1, further comprising:
the value of T is 10 s.
8. The method of claim 1, further comprising:
the value of the threshold It is 40 mA.
9. The method of claim 2, further comprising:
the value of t is 2.28S.
10. The method of claim 1, further comprising:
when the method adopts two channels to carry out the direct current offset calibration value in S3, the method comprises the step 2) to the step 4) of repeating.
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Cited By (4)
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| CN112666390A (en) * | 2021-01-20 | 2021-04-16 | 淮北工科检测检验有限公司 | Electric energy detection metering system |
| CN112946549A (en) * | 2021-01-28 | 2021-06-11 | 杭州西力智能科技股份有限公司 | Method for correcting direct current component in alternating current system |
| CN114113732A (en) * | 2021-12-15 | 2022-03-01 | 杭州万高科技股份有限公司 | Single-phase electric energy metering chip meeting anti-electricity-theft application of zero-line-dropping |
| CN115436871A (en) * | 2022-10-11 | 2022-12-06 | 石家庄科林电气股份有限公司 | Method for preventing zero line missing electricity stealing of single-phase electric energy meter based on low power consumption |
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