Auxiliary calculation method for electricity stealing quantity of single-phase intelligent electric energy meter

Abstract

The invention discloses a single-phase intelligent electric energy meter electricity stealing quantity auxiliary calculation method. A main metering unit and an auxiliary metering unit which are independent of each other are included. The main metering unit is used for normal charging and settlement; the auxiliary metering unit is used for auxiliary calculation of electricity stealing quantity, the auxiliary metering unit is used for carrying out analog sampling on voltage between a live wire and a null line and carrying out analog sampling on current in a null line loop, and then analog quantity of analog sampling is converted into digital quantity through an internal analog-to-digital converter and is transmitted to a metering chip in the electric energy meter; the main metering unit is used for normal charging and settlement, the auxiliary metering unit is used for auxiliary calculation of the electricity stealing quantity, wrong metering of an existing calculation method can be avoided, the electricity stealing quantity can be metered independently, a basis is provided for punishment of an existing regulation, and the electricity stealing time is judged and the electricity stealing quantity is calculated through the method. Accuracy and standardization of electricity stealing quantity determination are greatly improved, and divergence of electricity stealing quantity determination of power supply enterprises, electricity stealing users, judicial offices and the like is reduced.

Description

Technical Field

[0001] The invention relates to an auxiliary calculation method for the amount of electricity stolen from an electric energy meter, and in particular to an auxiliary calculation method for the amount of electricity stolen from a single-phase intelligent electric energy meter. Background Art

[0002] Electricity is an intangible special commodity, and it is difficult to accurately calculate the amount of electricity stolen manually. The new version of the "Power Supply Business Rules" was officially implemented on June 1, 2024. Article 105 revised the provisions of Article 103 of the 1996 version of the "Power Supply Business Rules". It no longer directly specifies the calculation method, but is revised to "If it can be verified that the user has stolen electricity, the amount of electricity stolen shall be determined according to the verified amount". For the amount of electricity stolen that cannot be verified, it shall be calculated according to the specified method. Most of the existing plans are based on the old version of the 1996 version of the "Power Supply Business Rules" for verification.

[0003] At present, power companies in some countries around the world have added auxiliary calculation functions for electricity theft in smart electricity meters. It is understood that taking India as an example, its solution is to directly take the maximum value of the collected live wire current and neutral wire current for calculation during the metering process, and the calculation result is directly used for billing and settlement, and it is impossible to distinguish between the normal billing and settlement part and the reference electricity theft part.

[0004] However, the Indian version of the solution has the following problems: First, in my country's actual electricity usage scenarios, the problem of shared neutral lines often occurs. At this time, the electricity meter will measure too much electricity, resulting in distorted metered electricity. Therefore, the Indian solution is prone to incorrect measurement problems; secondly, my country's "Power Supply Business Rules" stipulate that power supply companies must collect electricity charges for the stolen electricity and collect liquidated damages of no more than three times. At the same time, electricity theft is a type of theft in my country. It is necessary to determine whether it constitutes a theft crime based on the amount of electricity stolen. Therefore, it is necessary to measure the stolen electricity separately. Summary of the invention

[0005] In order to solve the deficiencies of the above-mentioned technology, the present invention provides a method for auxiliary calculation of the amount of electricity stolen by a single-phase smart energy meter.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: an auxiliary calculation method for the amount of electricity stolen by a single-phase smart energy meter, comprising a main metering unit and an auxiliary metering unit that are independent of each other;

[0007] The main metering unit is used for normal billing and settlement;

[0008] The auxiliary metering unit is used for auxiliary calculation of electricity theft. It performs analog sampling on the voltage between the live wire and the neutral wire, and also performs analog sampling on the current in the neutral wire loop. Then, the analog quantity of the analog sampling is converted into a digital quantity through the internal analog-to-digital converter and transmitted to the metering chip in the electric energy meter.

[0009] Furthermore, the metering formula of the main metering unit is as follows:

[0010] W R =∫U R I R cosθ R d t ,

[0011] Where W R The amount of electricity measured by the main metering unit is U R ,I R 、cosθ R The integral of the product of the three over time t; U R I is the voltage used for measuring the main metering unit; R is the current used for measuring by the main metering unit; θ R for and I R The phase angle of .

[0012] Furthermore, the metering formula of the auxiliary metering unit is as follows:

[0013] W F =∫U F I F cosθ F d t ,

[0014] Where W F The amount of electricity measured by the auxiliary metering unit is U F ,I F 、cosθ F The integral of the product of the three over time t; U F I is the voltage used for auxiliary metering unit measurement; F is the current used for auxiliary metering unit measurement; θ F for and I F The phase angle of .

[0015] Furthermore, the auxiliary calculation of the electricity theft amount of the auxiliary metering unit includes auxiliary calculation of the electricity theft amount of the current electricity theft mode and the electricity theft amount of the voltage electricity theft mode. The current electricity theft mode corresponds to the current electricity theft event, and the voltage electricity theft mode corresponds to the voltage electricity theft event.

[0016] Furthermore, there is a priority for triggering the electricity theft event. When the triggering conditions for the current electricity theft event and the voltage electricity theft event are met at the same time, the current electricity theft event record is triggered first.

[0017] Furthermore, for current theft events, the total number of current theft events and the details of each record are set in the electric energy meter. The triggering conditions of the current theft events and the contents of each record are as follows:

[0018] When I F -I R When the current is ≥0.1A and lasts for more than 2 seconds, the current theft event record is triggered, and the year, month, day, hour, minute and second of the time of occurrence are recorded, and the auxiliary metering unit starts metering;

[0019] When I F -I R When the current is less than 0.1A and lasts for more than 2 seconds, the current electricity theft event record is terminated, and the year, month, day, hour, minute, and second of the end time are recorded. The auxiliary metering unit ends the measurement, and the amount of electricity stolen in this current electricity theft event is calculated as:

[0020] W Q =W F -W R

[0021] Where W Q is the amount of electricity stolen in this current theft event; W F The amount of electricity measured by the auxiliary metering unit in this current theft event; W R The amount of electricity measured by the main metering unit in this current theft incident;

[0022] In the text, I R The current measured by the main metering unit; I F Current measured by the auxiliary metering unit.

[0023] Furthermore, for voltage theft events, the total number of voltage theft events and the details of each record are set in the electric energy meter. The triggering conditions of the voltage theft events and the contents of each record are as follows:

[0024] When I R >0A、U R When the voltage is less than 198V and lasts for more than 2 seconds, the voltage theft event record is triggered, and the year, month, day, hour, minute and second of the time of occurrence are recorded;

[0025] If U F ≥198V, the auxiliary metering unit starts metering, otherwise it stops metering; if U F <198V, the main metering unit starts to accumulate and record the ampere-hours during this voltage theft event, otherwise it stops accumulating. The calculation formula is:

[0026] Ah R =∫I R d t ,

[0027] In the formula, Ah R is ampere-hour, which is I R The integral over time t; IR is the measured current.

[0028] Furthermore, for voltage theft events, the total number of voltage theft events and the details of each record are set in the electric energy meter. The triggering conditions of the voltage theft events and the contents of each record are as follows:

[0029] WhenU R When the voltage is ≥198V and the duration exceeds 2 seconds or the electric energy meter loses power, the record of this voltage theft event ends, and the year, month, day, hour, minute and second of the end time are recorded. The auxiliary metering unit ends the measurement, and the main metering unit stops accumulating the ampere-hours during this voltage theft event. The amount of electricity stolen during this voltage theft event is calculated as:

[0030] W Q =W F +U AR Ah R cosθ AR -W R ,

[0031] Where W Q is the amount of electricity stolen in this voltage theft event; W R W is the amount of electricity measured by the main metering unit in this voltage theft event; F The amount of electricity measured by the auxiliary metering unit in this voltage theft event; U AR The voltage U within 1 minute before the current power theft event occurs R The average value of Ah R is ampere-hour; cosθ AR is cosθ within 1 minute before the current power theft event R If other power theft incidents occurred within 1 minute before the current power theft incident, the average value of the 1 minute before the first power theft incident will be taken.

[0032] Furthermore, when low-voltage users steal electricity by privately connecting the live wire, short-circuiting the live wire, reversely connecting the neutral wire and the live wire, or disconnecting the neutral wire before the meter, the actual current calculation formula is:

[0033] I F =I R +I Q ,

[0034] In the formula, I F Current measured by the auxiliary metering unit; I R The current measured by the main metering unit; I Q The current for power theft.

[0035] Furthermore, the main metering unit and the auxiliary metering unit each include two wiring terminals. The two wiring terminals of the main metering unit are connected to the live wire on the power supply side and the live wire on the load side from left to right, respectively. The two wiring terminals of the auxiliary metering unit are connected to the neutral wire on the power supply side and the neutral wire on the load side from left to right, respectively.

[0036] The invention discloses an auxiliary calculation method for the amount of electricity theft of a single-phase smart energy meter. The method comprises a main metering unit and an auxiliary metering unit which are independent of each other. The main metering unit is used for normal billing and settlement, and the auxiliary metering unit is used for auxiliary calculation of the amount of electricity theft. The method can not only avoid the erroneous measurement of the existing calculation method, but also measure the amount of electricity theft separately, improve the reliability of the auxiliary metering, and provide a basis for the punishment of the existing regulations. The method is used to determine the time of electricity theft and calculate the amount of electricity theft, which greatly improves the accuracy and standardization of the identification of the amount of electricity theft, and reduces the differences among power supply enterprises, electricity theft users, judicial organs, etc. on the identification of the amount of electricity theft. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a circuit schematic diagram of the present invention. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0039] like Figure 1 As shown, this embodiment is about the auxiliary calculation method of the stolen electricity quantity of the single-phase smart energy meter, including a main metering unit and an auxiliary metering unit which are independent of each other. The main metering unit is used for normal billing and settlement, and the auxiliary metering unit is used for auxiliary calculation of the stolen electricity quantity. The two are independent of each other, which can not only avoid the incorrect measurement of the existing calculation method, but also measure the stolen electricity quantity separately, improve the reliability of the auxiliary metering, and provide a basis for the punishment of the existing regulations; wherein the auxiliary metering unit performs analog sampling on the voltage between the live wire and the neutral wire, and also performs analog sampling on the current in the neutral wire loop, and then converts the analog quantity of the analog sampling into a digital quantity through the internal analog-to-digital converter and transmits it to the metering chip in the energy meter.

[0040] like Figure 1 As shown, in the circuit diagram, there are four wiring terminals from left to right. The main metering unit and the auxiliary metering unit each include two wiring terminals. The two wiring terminals of the main metering unit are connected to the live wire on the power supply side and the live wire on the load side from left to right, respectively. The two wiring terminals of the auxiliary metering unit are connected to the neutral wire on the power supply side and the neutral wire on the load side from left to right.

[0041] In this embodiment, the metering formula of the main metering unit is as follows:

[0042] W R =∫U R I R cosθ R d t ,

[0043] Where W R The amount of electricity measured by the main metering unit is U R ,I R 、cosθ R The integral of the product of the three over time t; U R I is the voltage used for measuring the main metering unit; R is the current used for measuring by the main metering unit; θ R for and I R The phase angle of .

[0044] In this embodiment, the metering formula of the auxiliary metering unit is as follows:

[0045] W F =∫U F I F cosθ F d t ,

[0046] Where W F The amount of electricity measured by the auxiliary metering unit is U F ,I F 、cosθ F The integral of the product of the three over time t; U F I is the voltage used for auxiliary metering unit measurement; F is the current used for auxiliary metering unit measurement; θ F for and I F The phase angle of .

[0047] The auxiliary calculation of the electricity theft amount of the auxiliary metering unit includes the auxiliary calculation of the electricity theft amount of the current theft method and the electricity theft amount of the voltage theft method. The current theft method corresponds to the current theft event, and the voltage theft method corresponds to the voltage theft event.

[0048] For current theft events, the total number of current theft events and the details of each record are set in the electric energy meter, that is, the fields - the total number of current theft events and the details of the nth current theft event are set in the electric energy meter software program. It should be noted that the initial value of the total number is set to 0, and it is accumulated once it is triggered. Among them, the details of the current theft event are set with fields - start time, end time, power of the main metering unit during the period, power of the auxiliary metering unit during the period, and power stolen.

[0049] The trigger conditions for current theft events and the contents of each record are as follows:

[0050] When I F -I RWhen the current is ≥0.1A and lasts for more than 2 seconds, the current theft event record is triggered, and the year, month, day, hour, minute and second of the time of occurrence are recorded, and the auxiliary metering unit starts metering;

[0051] When I F -I R When the current is less than 0.1A and lasts for more than 2 seconds, the current electricity theft event record is terminated, and the year, month, day, hour, minute and second of the end time are recorded. The auxiliary metering unit ends the measurement, and the amount of electricity stolen in this current electricity theft event is calculated as:

[0052] W Q =W F -W R

[0053] Where W Q is the amount of electricity stolen in this current theft event; W F The amount of electricity measured by the auxiliary metering unit in this current theft event; W R The amount of electricity measured by the main metering unit in this current theft incident;

[0054] In the text, I R The current measured by the main metering unit; I F Current measured by the auxiliary metering unit.

[0055] On this basis, the typical implementation cases of this embodiment are as follows:

[0056] A single-phase smart electricity meter is installed at a residential user. When the electricity is used normally, the load data recorded by the main metering unit and the auxiliary metering unit of the electricity meter are consistent, as shown in Table 1. It should be noted that, to facilitate understanding by technicians in this field, this typical implementation case assumes that the load remains unchanged.

[0057] Table 1 Load data recorded by the electric energy meter during normal power consumption

[0058]

[0059]

[0060] At 08:00:00 on August 27, 2024, the user committed electricity theft by privately connecting a live wire to the power supply line (without being measured by the electricity meter) to replace the live wire from the electricity meter. The neutral wire still used the neutral wire from the electricity meter.

[0061] After the electricity theft occurs, the load data recorded by the main metering unit and the auxiliary metering unit of the electricity meter becomes as shown in Table 2.

[0062] Table 2 Load data recorded by the electric energy meter during electricity theft

[0063] Main metering unit <![CDATA[Voltage U R > <![CDATA[Current I R > <![CDATA[Power factor cosθ R > Load value 220V 0 0 Auxiliary metering unit <![CDATA[Voltage U F > <![CDATA[Current I F > <![CDATA[Power factor cosθ F > Load value 220V 1.45A 0.98

[0064] At this time I F -I R ≥0.1A and lasts for more than 2 seconds, triggering the current theft event record, recording the year, month, day, hour, minute and second of the time of occurrence, that is, 08:00:00 on August 27, 2024, and the auxiliary metering unit starts metering.

[0065] At 12:00:00 on August 28, 2024, the power supply company discovered and stopped the household's electricity theft, and restored the scene to its pre-theft state. The load data recorded by the main metering unit and the auxiliary metering unit of the electricity meter became consistent again, as shown in Table 1.

[0066] At this time I F -I R <0.1A and lasts for more than 2 seconds, the current electricity theft event record ends, and the year, month, day, hour, minute, and second of the end time are recorded, that is, at 12:00:00 on August 28, 2024, the auxiliary metering unit ends the measurement, and the amount of electricity stolen in this current electricity theft event is calculated as:

[0067] W R =U R I R cosθ R T=220V×0A×0.98×28h=0kWh,

[0068] W F =U F I F cosθ F T=220V×1.45A×0.98×28h=8.75336kWh,

[0069] W Q =W F -W R =8.75336kWh-0kWh=8.75336kWh,

[0070] Where W Q is the amount of electricity stolen in this current theft event; W F The amount of electricity measured by the auxiliary metering unit in this current theft event; W R It is the amount of electricity measured by the main metering unit in this current theft incident.

[0071] The total number of current theft events of the energy meter changes from 0 to 1, and the details of the first current theft event are generated, as shown in Table 3.

[0072] Table 3 Details of the first current theft incident

[0073] Fields Field Content Start time 2024-08-27 08:00:00 End time 2024-08-28 12:00:00 The main metering unit power during the period 0kWh Auxiliary metering unit power during the period 8.75336kWh Electricity theft 8.75336kWh

[0074] For voltage theft events, the total number of voltage theft events and the details of each record are set in the electric energy meter, that is, the fields - the total number of voltage theft events and the details of the nth voltage theft event are set in the electric energy meter software program. It should be noted that the initial value of the total number is set to 0, and it is accumulated once it is triggered. Among them, the voltage theft event details are set with fields - start time, end time, main metering unit power during the period, auxiliary metering unit power during the period, cumulative ampere-hours of the main metering unit during the period, average voltage 1 minute before the event, average power factor 1 minute before the event, average voltage 1 minute before the first theft event, average power factor 1 minute before the first theft event, and stolen power.

[0075] The trigger conditions for voltage theft events and the contents of each record are as follows:

[0076] When I R >0A、U R When the voltage is less than 198V and lasts for more than 2 seconds, the voltage theft event record is triggered, and the year, month, day, hour, minute and second of the time of occurrence are recorded;

[0077] If U F ≥198V, the auxiliary metering unit starts metering, otherwise it stops metering; if U F <198V, the main metering unit starts to accumulate and record the ampere-hours during this voltage theft event, otherwise it stops accumulating. The calculation formula is:

[0078] Ah R =∫I R d t ,

[0079] In the formula, Ah R is ampere-hour, which is I R The integral over time t; I R is the measured current.

[0080] On this basis, for voltage theft events, when U R When the voltage is ≥198V and the duration exceeds 2 seconds or the electric energy meter loses power, the record of this voltage theft event ends, and the year, month, day, hour, minute and second of the end time are recorded. The auxiliary metering unit ends the measurement, and the main metering unit stops accumulating the ampere-hours during this voltage theft event. The amount of electricity stolen during this voltage theft event is calculated as:

[0081] W Q =W F +U AR Ah R cosθAR -W R ,

[0082] Where W Q is the amount of electricity stolen in this voltage theft event; W R W is the amount of electricity measured by the main metering unit in this voltage theft event; F The amount of electricity measured by the auxiliary metering unit in this voltage theft event; U AR The voltage U within 1 minute before the current power theft event occurs R The average value of Ah R is ampere-hour; cosθ AR is cosθ within 1 minute before the current power theft event R If other power theft incidents occurred within 1 minute before the current power theft incident, the average value of the 1 minute before the first power theft incident will be taken.

[0083] On this basis, the typical implementation cases of this embodiment are as follows:

[0084] A single-phase smart electricity meter is installed at a residential user. When the electricity is used normally, the load data recorded by the main metering unit and the auxiliary metering unit of the electricity meter are consistent, as shown in Table 4. It should be noted that, to facilitate understanding by technicians in this field, this typical implementation case assumes that the load remains unchanged.

[0085] Table 4 Load data recorded by the energy meter during normal power consumption

[0086] Main metering unit <![CDATA[Voltage U R > <![CDATA[Current I R > <![CDATA[Power factor cosθ R > Load value 220V 1.45A 0.98 Auxiliary metering unit <![CDATA[Voltage U F > <![CDATA[Current I F > <![CDATA[Power factor cosθ F > Load value 220V 1.45A 0.98

[0087] At 08:00:00 on August 27, 2024, the user committed electricity theft by connecting a voltage divider resistor in series in the voltage sampling circuit of the main metering unit and the auxiliary metering unit of the energy meter, making the voltage of the energy meter far lower than the actual value, resulting in under-measurement. After the electricity theft occurred, the load data recorded by the main metering unit and the auxiliary metering unit of the energy meter became as shown in Table 5.

[0088] Table 5 Load data recorded by the electric energy meter during electricity theft

[0089] Main metering unit <![CDATA[Voltage U R > <![CDATA[Current I R > <![CDATA[Power factor cosθ R > Load value 30V 1.45A 0.98 Auxiliary metering unit <![CDATA[Voltage U F > <![CDATA[Current I F > <![CDATA[Power factor cosθ F > Load value 30V 1.45A 0.98

[0090] At this time I R >0A、U R <198V and lasts for more than 2 seconds, triggering the voltage theft event record, recording the year, month, day, hour, minute and second of the time of occurrence, that is, 08:00:00 on August 27, 2024.

[0091] Because U F<198V, the auxiliary metering unit does not start metering, and the main metering unit begins to accumulate and record the ampere-hours during this voltage theft event.

[0092] At 12:00:00 on August 28, 2024, the power supply company discovered and stopped the household's electricity theft, and cut off power to and removed the tampered electricity meter.

[0093] Due to the loss of power to the energy meter, the record of this voltage theft event ended, and the year, month, day, hour, minute, and second of the end time were recorded, which was 12:00:00 on August 28, 2024. The main metering unit stopped accumulating the ampere-hours during this voltage theft event, and the amount of electricity stolen in this voltage theft event was calculated as,

[0094] Since the auxiliary metering unit did not start metering this time, W F =0kWh,

[0095] W R =U R I R cosθ R T=30V×1.45A×0.98×28h=1.19364kWh,

[0096] Ah R =I R T = 1.45A × 28h = 40.6Ah,

[0097] W Q =W F +U AR Ah R cosθ AR -W R =0kWh+220V×40.6Ah×0.98-1.19364kWh=7.55972kWh,

[0098] Where W Q is the amount of electricity stolen in this voltage theft event; W R W is the amount of electricity measured by the main metering unit in this voltage theft event; F The amount of electricity measured by the auxiliary metering unit in this voltage theft event; U AR The voltage U within 1 minute before the current power theft event occurs R The average value of Ah R is ampere-hour; cosθ AR is cosθ within 1 minute before the current power theft event R The average value of .

[0099] If other electricity theft incidents occurred within 1 minute before the current electricity theft incident, the average value of the 1 minute before the first electricity theft incident will be taken.

[0100] The total number of voltage theft events of the energy meter changes from 0 to 1, and the details of the first voltage theft event are generated, as shown in Table 6.

[0101] Table 6 Details of the first voltage theft incident

[0102]

[0103]

[0104] On this basis, there is a priority for triggering electricity theft events. When the triggering conditions of current electricity theft events and voltage electricity theft events are met at the same time, the current electricity theft event record is triggered first. Specifically:

[0105] Determine whether there is I F -I R ≥0.1A and lasts for more than 2 seconds. If the conditions are met, the current theft event record is triggered, and subsequent judgment is made until the current theft event ends. If the conditions are not met, it is judged whether there is I R >0A、U R <198V and lasts for more than 2 seconds. If this condition is met, the voltage theft event record is triggered. On this basis, regardless of whether the voltage theft event record has been triggered, it will return to determine whether there is an I F -I R ≥0.1A and lasts for more than 2 seconds; then judge in the above order in a loop.

[0106] Furthermore, if the voltage theft event record has been triggered, I F -I R If the voltage is greater than 0.1A and lasts for more than 2 seconds, the recording of the voltage theft event ends and the recording of the current theft event starts. After the recording of the current theft event ends, the cycle judgment starts again.

[0107] The exception is that if it is midnight on the 1st of each calendar month, the current electricity theft event record is forced to end and the cycle judgment starts again.

[0108] Adding event trigger priority can effectively solve the problem of identifying the amount of electricity stolen by low-voltage users, including private connection of live wires, short connection of live wires, reverse connection of neutral and live wires, and disconnection of neutral wires before the meter, which are the most common and largest theft methods. When low-voltage users use the theft methods including private connection of live wires, short connection of live wires, reverse connection of neutral and live wires, and disconnection of neutral wires before the meter, the actual current calculation formula is:

[0109] I F =I R +I Q ,

[0110] In the formula, IF Current measured by the auxiliary metering unit; I R The current measured by the main metering unit; I Q The current for power theft.

[0111] The present application discloses a method for auxiliary calculation of the amount of electricity stolen by a single-phase smart energy meter. The method comprises a main metering unit and an auxiliary metering unit which are independent of each other. The main metering unit is used for normal billing and settlement, and the auxiliary metering unit is used for auxiliary calculation of the amount of electricity stolen. The method can not only avoid the erroneous measurement of the existing calculation method, but also measure the amount of electricity stolen separately, improve the reliability of the auxiliary metering, and provide a basis for the punishment of the existing regulations. The method is used to determine the time of electricity theft and calculate the amount of electricity stolen, which greatly improves the accuracy and standardization of the identification of the amount of electricity stolen, and reduces the differences among power supply enterprises, electricity theft users, judicial organs, etc. on the identification of the amount of electricity stolen.

[0112] The above implementation modes are not limitations of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the scope of the technical solution of the present invention also belong to the protection scope of the present invention.

Claims

1. A method for auxiliary calculation of electric quantity theft in a single-phase smart electric energy meter, characterized in that: It includes a main metering unit and an auxiliary metering unit which are independent of each other; The main metering unit is used for normal billing and settlement; The auxiliary metering unit is used for auxiliary calculation of the amount of electricity theft. The auxiliary metering unit performs analog sampling on the voltage between the live wire and the neutral wire, and also performs analog sampling on the current in the neutral wire loop, and then converts the analog quantity of the analog sampling into a digital quantity through an internal analog-to-digital converter and transmits it to the metering chip in the electric energy meter.

2. The method for auxiliary calculation of the amount of electricity stolen by a single-phase smart energy meter according to claim 1 is characterized in that: The metering formula of the main metering unit is as follows: W R =∫U R I R cosθ R d t , Where W R The amount of electricity measured by the main metering unit is U R ,I R 、cosθ R The integral of the product of the three over time t; U R I is the voltage used for measuring the main metering unit; R is the current used for measuring by the main metering unit; θ R for and I R The phase angle of .

3. The method for auxiliary calculation of electric power theft of single-phase smart electric energy meter according to claim 1 is characterized in that: The metering formula of the auxiliary metering unit is as follows: W F =∫U F I F cosθ F d t , Where W F The amount of electricity measured by the auxiliary metering unit is U F ,I F 、cosθ F The integral of the product of the three over time t; U F I is the voltage used for auxiliary metering unit measurement; F is the current used for auxiliary metering unit measurement; θ F for and I F The phase angle of .

4. The method for auxiliary calculation of electric quantity theft of single-phase smart electric energy meter according to claim 3 is characterized in that: The auxiliary calculation of the amount of electricity theft by the auxiliary metering unit includes auxiliary calculation of the amount of electricity theft by current and voltage. The current electricity theft corresponds to a current electricity theft event, and the voltage electricity theft corresponds to a voltage electricity theft event.

5. According to the single-phase smart energy meter theft auxiliary calculation method of claim 4, the theft event trigger has a priority, characterized in that: When the trigger conditions of current power theft event and voltage power theft event are met at the same time, the current power theft event record is triggered first.

6. The method for auxiliary calculation of the amount of electricity stolen by a single-phase smart energy meter according to claim 5 is characterized in that: For current theft events, the total number of current theft events and the details of each record are set in the electric energy meter. The triggering conditions of the current theft events and the contents of each record are as follows: When I F -I R When the current is ≥0.1A and lasts for more than 2 seconds, the current theft event record is triggered, and the year, month, day, hour, minute and second of the time of occurrence are recorded, and the auxiliary metering unit starts metering; When I F -I R When the current is less than 0.1A and lasts for more than 2 seconds, the current electricity theft event record is terminated, and the year, month, day, hour, minute, and second of the end time are recorded. The auxiliary metering unit ends the measurement, and the amount of electricity stolen in this current electricity theft event is calculated as: IN Q =In F -IN R Where W Q is the amount of electricity stolen in this current theft event; W F The amount of electricity measured by the auxiliary metering unit in this current theft event; W R The amount of electricity measured by the main metering unit in this current theft incident; In the text, I R The current measured by the main metering unit; I F Current measured by the auxiliary metering unit.

7. The method for auxiliary calculation of electric power theft of a single-phase smart electric energy meter according to claim 5 is characterized in that: For voltage theft events, the total number of voltage theft events and the details of each record are set in the electric energy meter. The triggering conditions of the voltage theft events and the contents of each record are as follows: When I R >0A、U R When the voltage is less than 198V and lasts for more than 2 seconds, the voltage theft event record is triggered, and the year, month, day, hour, minute and second of the time of occurrence are recorded; If U F ≥198V, the auxiliary metering unit starts metering, otherwise it stops metering; if U F <198V, the main metering unit starts to accumulate and record the ampere-hours during this voltage theft event, otherwise it stops accumulating. The calculation formula is: Ah R =∫I R d t , In the formula, Ah R is ampere-hour, which is I R The integral over time t; I R is the measured current.

8. The method for auxiliary calculation of electric quantity theft of single-phase smart electric energy meter according to claim 7 is characterized in that: For voltage theft events, the total number of voltage theft events and the details of each record are set in the electric energy meter. The triggering conditions of the voltage theft events and the contents of each record are as follows: WhenU R When the voltage is ≥198V and the duration exceeds 2 seconds or the electric energy meter loses power, the record of this voltage theft event ends, and the year, month, day, hour, minute and second of the end time are recorded. The auxiliary metering unit ends the measurement, and the main metering unit stops accumulating the ampere-hours during this voltage theft event. The amount of electricity stolen during this voltage theft event is calculated as: W Q =W F +U AR Ah R cosθ AR -W R , Where W Q is the amount of electricity stolen in this voltage theft event; W R W is the amount of electricity measured by the main metering unit in this voltage theft event; F The amount of electricity measured by the auxiliary metering unit in this voltage theft event; U AR The voltage U within 1 minute before the current power theft event occurs R The average value of Ah R is ampere-hour; cosθ AR is cosθ within 1 minute before the current power theft event occurred R If other power theft incidents occurred within 1 minute before the current power theft incident, the average value of the 1 minute before the first power theft incident will be taken.

9. The method for auxiliary calculation of electric power theft of a single-phase smart electric energy meter according to claim 1 is characterized in that: When low-voltage users steal electricity by privately connecting the live wire, short-circuiting the live wire, reversely connecting the neutral wire and the live wire, or disconnecting the neutral wire before the meter, the actual current calculation formula is: I F =I R +I Q , In the formula, I F The current measured by the auxiliary metering unit; I R The current measured by the main metering unit; I Q The current for power theft.

10. The method for auxiliary calculation of electric quantity theft of single-phase smart electric energy meter according to claim 1 is characterized in that: The main metering unit and the auxiliary metering unit each include two wiring terminals. The two wiring terminals of the main metering unit are connected to the live wire on the power supply side and the live wire on the load side from left to right, respectively. The two wiring terminals of the auxiliary metering unit are connected to the neutral wire on the power supply side and the neutral wire on the load side from left to right.

Images