Electricity stealing time judgment and electric quantity calculation method

Abstract

The invention discloses an electricity larceny time judgment and electric quantity calculation method, which comprises the following steps of: analyzing an electricity larceny type after finding electricity larceny, correspondingly judging the electricity larceny time and calculating the electric quantity, judging whether an electric energy meter event record is triggered or not, calculating according to an electric energy meter event recording method, judging whether typical load characteristics exist or not, and calculating according to a load data characteristic method. Judging whether line loss change is obvious or not, calculating according to a transformer area or line loss change method, judging whether a metering reference point exists or not, and calculating according to the metering reference point; according to the method, the electricity stealing quantity affirmation accuracy and standardization degree are greatly improved, the divergence of electricity stealing quantity affirmation of power supply enterprises, electricity stealing users, judicial offices and the like is reduced, the electricity loss of the power supply enterprises is effectively retrieved, and compared with a traditional algorithm, the per-household compensation amount is remarkably increased; by restoring the actual electricity stealing quantity, an electricity stealing user cannot pay less electricity fee by using the vulnerability of a traditional algorithm, the attempt of electricity stealing is effectively restrained, and the order of power supply and consumption is maintained.

Description

Technical Field

[0001] The invention belongs to the field of electricity metering, and more specifically relates to a method for determining electricity theft time and calculating electricity quantity. Background Art

[0002] Electricity is an important basic energy source for national economic and social development. In recent years, the number of electricity thefts has been significantly reduced under the severe crackdown by power supply companies. However, driven by the temptation and profit, electricity thefts still persist despite repeated bans, and new means of electricity theft emerge in an endless stream, and are developing in a concealed, digital, professional and large-scale manner.

[0003] Electric energy has the characteristics of "generated and used immediately" and "invisible". It can only be accurately measured by electric energy metering devices. Once electricity theft occurs, the electric energy metering device fails, and it is very difficult to accurately measure the amount of stolen electricity. The existing technology mainly refers to the estimation method of multiplying the power of the power-consuming equipment by the usage time provided in Article 103 of the 1996 version of the "Power Supply Business Rules" (repealed). This method is formulated based on the power supply and consumption conditions at the time in 1996, which is nearly 30 years ago. At present, my country's power supply and consumption environment has undergone profound changes. Power-consuming equipment is more diverse, power consumption time is more flexible, and power consumption scenarios are more complex. The existing technical solutions can no longer adapt to the current situation. It is mainly reflected in the difficulty of counting all power-consuming equipment, determining the actual working power of power-consuming equipment, and determining the usage time of power-consuming equipment. The results obtained are often controversial, which is not in line with the principle of fairness and deepens the contradiction between the power supply and power consumption parties.

[0004] For example, a method for investigating and punishing electricity theft based on time-sharing electricity calculation is disclosed in the prior art, and the publication number is CN111524025A; it discloses the following steps: step 1, obtaining the meter codes and checkpoint assessment table codes of all users on the line; step 2, calculating the time-sharing electricity sales of all users on the line in the same time period according to the obtained meter codes; step 3, calculating the time-sharing power supply of the line according to the checkpoint assessment table code on the line; step 4, calculating the line loss rate of the line according to the time-sharing power supply and the time-sharing electricity sales; step 5, judging the relationship between the user's electricity consumption and the line loss rate, when the line loss is equal to the user's reduced electricity, it is judged that the user has committed electricity theft. This method for investigating and punishing electricity theft based on time-sharing electricity calculation provides necessary reference for power supply companies to select time nodes for on-site inspections, and at the same time makes power supply companies more targeted and directional in on-site inspections, thereby improving the success rate of power supply companies in investigating and punishing electricity theft. The disadvantage of this prior art is that the solution only performs relevant calculations on the power supply and line loss rate to determine whether the user has stolen electricity. However, this method of detecting electricity theft is limited to a single type and does not disclose how to accurately calculate the amount of electricity theft and the time of theft, which affects the determination of the subsequent penalty amount. Summary of the invention

[0005] In order to solve the deficiencies of the above technologies, the present invention provides a method for determining electricity theft time and calculating electricity quantity.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a method for determining the time of electricity theft and calculating the amount of electricity, which analyzes the type of electricity theft after the electricity theft is discovered and performs the corresponding determination of the time of electricity theft and the calculation of the amount of electricity, including:

[0007] Determine whether to trigger the electric energy meter event record, and calculate according to the electric energy meter event record method. The types applicable to the electric energy meter event record method include the electric energy meter modification type and the voltage loss record type;

[0008] Determine whether there is a typical load characteristic, and calculate according to the load data characteristic method. The types of load data characteristic method applicable include the type of calculable correction coefficient, the type of installation reference point measurement error, and the type of accumulative type;

[0009] Determine whether the line loss changes significantly, and calculate according to the line loss change method of the substation or line;

[0010] Determine whether there is a measurement reference point and calculate based on the measurement reference point.

[0011] Furthermore, the modified energy meter class determines the start time of electricity theft by retrieving the record of opening the cover of the energy meter. The calculation formula of the amount of electricity theft of the modified energy meter class is as follows:

[0012]

[0013] Where W Q The amount of electricity stolen; W E The electric energy value when the electricity theft is terminated; W S is the reading recorded in the cover opening record when the electricity theft occurred; K is the absolute value of the electric energy meter calibration error; k is the household's comprehensive multiplier, that is, the product of the voltage transformer multiplier and the current transformer multiplier.

[0014] Furthermore, the voltage loss record category is divided into the voltage loss times of the electric energy meter within 10 times and the voltage loss times of the electric energy meter greater than 10 times;

[0015] When the number of times the electric energy meter loses voltage is less than 10 times, the voltage loss record is used to determine the time of electricity theft, and the amount of electricity theft is calculated by multiplying the ampere-hours of the voltage-loss phase during each voltage loss period by the voltage and power factor. The calculation formula for the amount of electricity theft is as follows;

[0016]

[0017] Where: W Q is the amount of electricity stolen; U is the actual voltage of the electricity stolen phase; Ah n It is the number of ampere-hours of electricity stolen during the last n voltage loss periods, and n≤10; It is the average power factor of the household during normal electricity use.

[0018] When the number of times the electric energy meter loses voltage is greater than 10 times, the total accumulated time of voltage loss in the electric energy meter is read and then converted into hours or days as the electricity theft time of the household. The calculation of the amount of electricity theft refers to the cumulative calculation algorithm in the typical load characteristic algorithm.

[0019] Furthermore, the type of load data characteristic method is applied to determine the start time of electricity theft according to the characteristic start time.

[0020] Furthermore, the calculation formula for the amount of electricity stolen that can be used to calculate the correction coefficient is as follows:

[0021]

[0022] Where K is the correction coefficient; P T is the correct power expression; P F is the expression of the error power in the power stealing state.

[0023] W Q =(W E -W S )×(K-1)×k,

[0024] Where: W Q The amount of electricity stolen; W E The electric energy value when the electricity theft is terminated; W S is the electric energy expressed when electricity theft occurs; k is the household's comprehensive multiplier, which is the product of the voltage transformer multiplier and the current transformer multiplier.

[0025] Furthermore, the calculation formula for the amount of electricity stolen by the installation reference point measurement error is as follows:

[0026]

[0027] In the formula, K D is the difference rate; W R The power of the reference metering device installed; W M It is the electricity quantity of the billing electric energy meter in the state of electricity theft.

[0028] W Q =(W E -W S )×(K D -1)×k,

[0029] Where: W Q The amount of electricity stolen; W E The electric energy value when the electricity theft is terminated; W S is the electric energy expressed when electricity theft occurs; k is the household's comprehensive multiplier, which is the product of the voltage transformer multiplier and the current transformer multiplier.

[0030] Furthermore, the calculation formula for the cumulative amount of stolen electricity is as follows:

[0031]

[0032] Where W Q is the stolen electricity amount; U is the stolen electricity phase voltage value; I is the stolen electricity phase loss current value; is the average power factor of the household during normal electricity use; T is the time difference between load data points. If it is hourly data, T=1h; if it is half-hourly data, T=0.5h; if it is every 15 minutes data, T=0.25h; if it is every 5 minutes data, T=1 / 12h; if it is every minute data, T=1 / 60h.

[0033] Furthermore, according to the line loss change method of the substation or line, the starting time of electricity theft is determined by the line loss returning to normal level after investigation and punishment. The calculation formula for the amount of electricity theft is as follows:

[0034] W Q =W G ×(L F -L T ),

[0035] Where W Q The amount of electricity stolen; W G is the total power supply during the power theft period; L F , L T They are the average line loss rates during electricity theft and normal periods respectively.

[0036] Furthermore, the calculation formula for the amount of electricity stolen in the existing metering reference point calculation class is as follows:

[0037]

[0038] Where W Q The amount of electricity stolen; W n The power measured by the user's internal reference meter n; W M The amount of electricity measured by the billing energy meter installed by the power supply company; W L The transformer loss or line loss between the user's internal reference meter and the billing electricity meter installed by the power supply company is borne by the user.

[0039] Furthermore, if the above electricity theft type is not met, the start time and the amount of electricity theft are determined by other reasonable estimation methods.

[0040] The present invention discloses a method for determining the time of electricity theft and calculating the amount of electricity, which not only greatly improves the accuracy and standardization of the identification of the amount of electricity theft, reduces the disagreement among power supply companies, electricity theft users, judicial organs, etc. on the identification of the amount of electricity theft, but also effectively recovers the electricity loss of the power supply company. Compared with the traditional algorithm, the average amount of compensation per household is significantly improved; by restoring the actual amount of electricity theft, the electricity theft users can no longer use the loopholes in the traditional algorithm to pay less electricity bills, which effectively curbs the attempt of electricity theft and maintains the order of electricity supply and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0042] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0043] This embodiment is about a method for determining the time of electricity theft and calculating the amount of electricity. According to the characteristics of various forms of electricity theft, it will comprehensively analyze data such as electric energy metering device records, electricity consumption information collection system, energy Internet marketing service system, integrated electricity and line loss management system, and on-site investigation records, and propose a reasonable method for determining the time of electricity theft and calculating the amount of electricity theft.

[0044] In this embodiment, after electricity theft is discovered, the type of electricity theft is analyzed and the electricity theft time is determined and the electricity quantity is calculated accordingly, including:

[0045] Determine whether to trigger the electric energy meter event record, calculate according to the electric energy meter event record method, and the types applicable to the electric energy meter event record method include the electric energy meter modification type and the voltage loss record type; determine whether there is a typical load characteristic, calculate according to the load data characteristic method, and the types applicable to the load data characteristic method include the calculable correction coefficient type, the installation reference point measurement error type, and the accumulative type; determine whether the line loss change is obvious, calculate according to the line loss change method of the substation or line; determine whether there is a metering reference point, and calculate according to the metering reference point; if it does not meet the above-mentioned electricity theft type, determine the start time and determine the amount of stolen electricity through other reasonable estimation methods; It should be noted that the above determination is as follows Figure 1 The figure shows the calculation methods selected in sequence according to the process, and finally the optimal calculation result is obtained.

[0046] For the modification of electric energy meters, it refers to the form of electricity theft that destroys the factory seal or calibration seal of the electric energy meter, modifies the internal part of the electric energy meter, and makes the electric energy meter measure inaccurately or invalid; common means of electricity theft by modifying the electric energy meter include short-circuiting the current sampling circuit, changing the resistance value of the voltage sampling circuit, replacing the crystal oscillator component, destroying the capacitor or optocoupler component, etc.; the electricity theft by modifying the electric energy meter is determined by retrieving the opening record of the electric energy meter to determine the starting time of the electricity theft, and accurately calculates the stolen amount according to the calibration error of the electric energy meter. The calculation formula of the stolen amount is as follows:

[0047] Where W Q The amount of electricity stolen; W E The electric energy value when the electricity theft is terminated; W S is the reading recorded in the cover opening record when the electricity theft occurred; K is the absolute value of the electric energy meter calibration error; k is the household's comprehensive multiplier, that is, the product of the voltage transformer multiplier and the current transformer multiplier.

[0048] In a typical case of electricity theft by modifying a single-phase smart energy meter applied in this embodiment, the live current sampling circuit of the energy meter was short-circuited with a copper wire. According to the record of the energy meter cover opening event, the energy meter was opened at 10:41:30 on August 2, 2021. When it was opened, the total positive active reading of the energy meter was 2814.43 kWh. When the electricity theft was investigated, the normal total active reading of the energy meter had reached 3841.56 kWh. According to the calibration, the error of the energy meter was -87.32%. It is known that the household did not install a transformer on site, that is, the comprehensive ratio was 1, so it can be determined that the start time of the electricity theft was August 2, 2021. The calculation formula for the amount of electricity theft disclosed in this embodiment is calculated as follows:

[0049] In this way, the formula of this embodiment can be used to calculate the specific amount of electricity stolen in this typical case.

[0050] For the voltage loss record type, in actual situations, the voltage loss theft of three-phase four-wire direct-entry electric energy meters refers to the opening or loosening of a phase voltage connection, which causes the voltage loss of the electric energy meter in that phase to achieve the purpose of undercounting or not counting the amount of electricity; the voltage loss record of this type of electric energy meter for electricity theft includes the number of voltage losses, the start and end time of each voltage loss, and the accumulated ampere-hours of the electric energy meter during the voltage loss period; when the number of voltage loss of the electric energy meter is less than 10 times, the voltage loss record is used to determine the time of electricity theft, and the ampere-hours of the voltage loss phase during each voltage loss record are multiplied by the voltage and power factor to calculate the amount of electricity theft. The calculation formula is as follows:

[0051] Where: W Q is the amount of electricity stolen; U is the actual voltage of the electricity stolen phase; Ah n It is the number of ampere-hours of electricity stolen during the last n voltage loss periods, and n≤10; It is the average power factor of the household during normal electricity use.

[0052] When the number of times the electric energy meter loses voltage is greater than 10 times, the total accumulated time of voltage loss in the electric energy meter is read and then converted into hours or days as the electricity theft time of the household. The calculation of the amount of electricity theft refers to the cumulative calculation algorithm in the typical load characteristic algorithm.

[0053] In the case of power theft caused by loss of voltage in a three-phase four-wire direct-entry energy meter applied in this embodiment, the voltage connection piece of phase C of the energy meter was opened, resulting in the voltage connection piece of phase C of the energy meter being 0V, and the power consumption of phase C could not be measured. The energy meter showed a total of 10 voltage loss records, and the last 10 (earliest) records occurred at 16:48:38 on January 9, 2020. The total ampere-hours of phase C during the last 1-10 records were 2151.65Ah. It is known that the phase C voltage of the household was measured to be 231.6V, and the average power factor during normal power consumption was 0.96. It can be determined that the start time of the power theft was January 9, 2020. The calculation formula for the amount of power theft disclosed in this embodiment is as follows:

[0054] W Q =0.2316*2151.65*0.96=478.39kWh; based on this, the formula of this embodiment can be used to calculate the specific amount of electricity stolen in this typical case.

[0055] In this embodiment, typical load characteristics in actual situations, such as: power meter stop, voltage loss or undervoltage, AC phase current imbalance, zero-fire current imbalance, power factor abnormality; for this, it is necessary to query the load data recorded every hour, every half hour, every 15 minutes, every 5 minutes, and every 1 minute in the electricity consumption information collection system, and accurately determine the start time of electricity theft based on the characteristic start time.

[0056] Preferably, for electricity theft methods in which the stolen electricity amount is proportional to the measured electricity amount, such as: various short-circuited energy meters or current circuits of transformers, the electricity amount can be calculated by finding the correction coefficient, and the calculation formula is as follows:

[0057] Where K is the correction coefficient; P T is the correct power expression; P F is the expression of the error power in the power stealing state.

[0058] W Q =(W E -W S )×(K-1)×k, where: W Q The amount of electricity stolen; W E The electric energy value when the electricity theft is terminated; W S is the electric energy expressed when electricity theft occurs; k is the household's comprehensive multiplier, which is the product of the voltage transformer multiplier and the current transformer multiplier.

[0059] In the single-phase smart meter short-circuit electricity theft case applied in this embodiment, the live wire circuit of the energy meter was short-circuited with a "U-shaped ring". The typical load characteristics of the electricity theft method are the imbalance of zero-fire current and the proportionality of zero-fire current. The load data recorded by the electricity consumption information collection system was queried, and it was found that the zero-fire current had a proportional imbalance since 20:00 on July 3, 2021. At that time, the total positive active reading of the energy meter was 1277.86kWh, the on-site measured voltage was 227.6V, the energy meter showed that the live wire current was 2.82A and the neutral wire current was 10.27A, the actual value of the measured live wire current was consistent with the neutral wire current displayed by the energy meter, the power factor was 0.98, and the comprehensive multiple was 1. When the investigation was carried out, the total positive active reading of the energy meter was 2873.49kWh. It can be determined that the starting time of the electricity theft was July 3, 2021, and the stolen electricity volume calculation formula is as follows:

[0060]

[0061] W Q =(2873.49-1277.86)×(3.64-1)×1=4212.46kWh; based on this, the formula of this embodiment can be used to calculate the specific amount of electricity stolen in this typical case.

[0062] Preferably, in actual use, when the accuracy of theoretical calculation is affected by special conditions such as serious imbalance of three-phase load of users, or the accuracy of theoretical calculation cannot be calculated due to special electricity theft methods, or users have disputes over the accuracy of theoretical calculation, under the premise of site conditions permitting, the original state of the billing and metering device is maintained, and a metering device is installed for comparison, and the electricity consumption of the user for a period of time is synchronously measured, and the difference rate is obtained by comparison. The specific calculation formula is as follows:

[0063] In the formula, K D is the difference rate; W R The power of the reference metering device installed; W M It is the electricity quantity of the billing electric energy meter in the state of electricity theft.

[0064] W Q =(W E -W S )×(K D -1)×k, where: W Q The amount of electricity stolen; W E The electric energy value when the electricity theft is terminated; W S is the electric energy expressed when electricity theft occurs; k is the household's comprehensive multiplier, which is the product of the voltage transformer multiplier and the current transformer multiplier.

[0065] In the case of electricity theft by a high-voltage transformer user applied in this embodiment, the electric energy metering method is high supply and high metering. The electric energy theft user uses a specific electric energy theft device to inject direct current into the current secondary circuit, causing magnetic saturation of the current transformer, and unable to accurately measure the actual current value of the circuit. Since the correction coefficient cannot be calculated theoretically in this case, the electric energy theft site is preserved in its original state, and a set of electric energy metering devices is installed separately as a reference. After one month of synchronous metering, the reference metering device measures 8739.23 kWh, and the original metering device in the electric energy theft state measures 4783.57 kWh. The data of the electricity consumption information collection system shows that the current has been abnormal since 00:15 on January 27, 2022. At that time, the total positive active reading of the energy meter was 17623.78kWh. When the electricity theft was investigated, the total positive active reading of the energy meter was 18423.93kWh. It is known that the voltage transformer ratio is 10kV / 100V=100, and the current transformer ratio is 15 / 5=3. The comprehensive ratio is 100×3=300. From the above, it can be determined that the starting time of the electricity theft is January 27, 2022. The calculation formula for the stolen electricity is as follows:

[0066]

[0067] W Q =(18423.93-17623.78)×(1.83-1)×300=199237.35kWh; based on this, the formula of this embodiment can be used to calculate the specific amount of electricity stolen in this typical case.

[0068] Preferably, for the disproportionate relationship between the stolen electricity and the measured electricity, such as private connection of the live wire, reverse connection of the neutral wire and the live wire, disconnection of the neutral wire before the meter, and opening of the voltage connection, the load data recorded by the system can be accumulated and calculated, and the calculation formula is as follows:

[0069] Where W Q is the stolen electricity amount; U is the stolen electricity phase voltage value; I is the stolen electricity phase loss current value; is the average power factor of the household during normal electricity use; T is the time difference between load data points. If it is hourly data, T=1h; if it is half-hourly data, T=0.5h; if it is every 15 minutes data, T=0.25h; if it is every 5 minutes data, T=1 / 12h; if it is every minute data, T=1 / 60h.

[0070] In the case of electricity theft by bypassing the electric energy meter applied in the present embodiment, the electric energy thief directly connected the live wire outlet of the single-phase smart electric energy meter to the incoming line, causing the live wire current value of the electric energy meter to be 0A and unable to be measured. The typical load characteristics of the electricity theft method are the imbalance of zero-fire current and the disproportion of zero-fire current. During normal electricity use, the zero-line current value of the single-phase smart electric energy meter is equal to the live wire current value. Although this kind of electricity theft method causes the live wire current value to be 0, it does not affect the zero-line current value, and the zero-line current value is the actual current value. By querying the load data recorded by the electricity information collection system, it was found that the zero-fire current was unbalanced since 23:15 on August 15, 2022. The current value was collected every 15 minutes. At the time of investigation, the total zero-line current value was 5874.75A, the actual measured voltage on site was 227.6V, and the power factor was 0.97. It can be determined that the start time of the electricity theft was August 15, 2022. The calculation formula for the amount of stolen electricity is as follows:

[0071] W Q =0.2276×5874.75×0.97×1 / 4=324.25kWh; based on this, the formula of this embodiment can be used to calculate the specific amount of electricity stolen in this typical case.

[0072] In the actual situation of the line loss change method of the present embodiment, there is often a positive or negative correlation between the power consumption of the power thief and the line loss rate of the power thief. The positive correlation is that when the power thief's power consumption is greater, the line loss rate of the power thief or line is higher. At this time, the amount of stolen electricity is generally proportional to the measured amount of electricity; the negative correlation is that when the power thief's power consumption is smaller, the line loss rate of the power thief or line is higher, and the amount of stolen electricity is not proportional to the measured amount of electricity; based on this, if there is an obvious sudden increase point in the line loss of the power thief's power thief, and the line loss before the sudden increase point is stable and basically consistent with the technical line loss of the power thief or line, and the line loss returns to the normal line loss level after investigation, this can be used as the basis for determining the start time of the power theft, and the amount of stolen electricity can be calculated with reference to the multi-loss electricity during the power theft period. The calculation formula for the amount of stolen electricity is as follows:

[0073] W Q =W G ×(L F -L T ), where W Q The amount of electricity stolen; W G L is the total power supply of the line or substation during the power theft period; F , L T They are the average line loss rates during electricity theft and normal periods respectively.

[0074] In the case of electricity theft applied in this embodiment, the integrated power and line loss management system is queried, and it is found that the power consumption of the electricity theft user has been significantly reduced since April 11, 2023. At the same time, the power loss rate of the transformer area that supplies power to it has increased significantly, from the previous average of 3.41% to an average of 5.53%. After the electricity theft was investigated, the line loss rate of the area fell back to an average of 3.41%. It is known that the total power supply of the transformer area during the period of electricity theft was 991.69kWh, so it can be determined that the starting time of the electricity theft was April 11, 2023. The power loss of this area that is more than normal is the stolen power, and the calculation formula is as follows:

[0075] W Q =991.69×(5.53%-3.41%)=21.02kWh; Based on this, the formula of this embodiment can be used to calculate the specific amount of electricity stolen in this typical case.

[0076] There are two prerequisites for the calculation based on the existing metering reference point: first, the reference metering device is qualified, or the error can be corrected; second, the installation, replacement, meter reading or electricity sales records of the reference metering device are complete and accurate, which can fully reflect the reference value relative to the billing electric energy metering device installed by the power supply company; in actual use, this calculation method is often used for high-voltage special transformer users with electric energy meters for settlement or assessment, and can also be used by low-voltage users who meet the conditions;

[0077] On this basis, the calculation formula for the amount of electricity stolen by the existing metering reference point calculation type is as follows:

[0078] Where W Q The amount of electricity stolen; W n The power measured by the user's internal reference meter n; W M The amount of electricity measured by the billing energy meter installed by the power supply company; W L The transformer loss or line loss between the user's internal reference meter and the billing electricity meter installed by the power supply company is borne by the user.

[0079] In the case of electricity theft by the property company applied in this embodiment, its metering method is low supply and low metering (not assuming transformer loss or line loss). There are 5 distribution lines in its distribution room, all of which are equipped with metering sub-meters, supplying electricity to 5 merchants respectively. The property company charges electricity fees to each merchant every month based on the electricity measured by this sub-meter. After verification, the 5 sub-meters have all passed the calibration and the measurement is accurate. According to the property meter reading records and the monthly payment receipts of the merchants, it is confirmed that the sub-meters and the power supply company's total metering meter are installed synchronously. After installation on March 24, 2021, the sub-meter electricity and the total meter electricity began to deviate from January 2022. After the deviation occurred until the theft of electricity was investigated and dealt with, the sub-meters have measured a total of 23985.18 kWh of electricity, and the total meter electricity of the power supply company is 14675.37 kWh. It can be determined that the starting time of the electricity theft is January 2022, and the theft of electricity is calculated as follows:

[0080] W Q =23985.18-14675.37=9309.81kWh; based on this, the formula of this embodiment can be used to calculate the specific amount of electricity stolen in this typical case.

[0081] In this embodiment, other reasonable estimation methods are existing technologies, and the starting time and the amount of stolen electricity are reasonably determined by existing means; the methods for determining the starting time include determining according to the change in electricity consumption, determining according to the actual electricity consumption, and determining according to the provisions of the power supply business rules; the determination of the amount of stolen electricity includes referring to the normal electricity consumption calculation type, the equipment power and usage time calculation type, and the electric energy meter calibration current calculation type.

[0082] In this way, the electricity theft time determination and electricity quantity calculation method disclosed in the present invention not only greatly improves the accuracy and standardization of the electricity theft identification, reduces the disagreement among power supply companies, electricity theft users, judicial organs, etc. on the identification of the amount of electricity theft, but also effectively recovers the electricity loss of the power supply company. Compared with the traditional algorithm, the average household compensation amount is significantly improved; by restoring the actual amount of stolen electricity, electricity theft users can no longer use the loopholes in the traditional algorithm to pay less electricity bills, which effectively curbs the attempt of electricity theft and maintains the order of electricity supply and use.

[0083] 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 determining electricity theft time and calculating electricity quantity, characterized in that: After the theft is discovered, the theft type is analyzed and the theft time and power calculation are performed accordingly, including: Determine whether to trigger an electric energy meter event record, and calculate according to an electric energy meter event record method, where the types applicable to the electric energy meter event record method include electric energy meter modification type and voltage loss record type; Determine whether there is a typical load characteristic, and calculate according to the load data characteristic method. The types of load data characteristic method applicable include the type of calculable correction coefficient, the type of installation reference point measurement error, and the type of accumulative type; Determine whether the line loss changes significantly, and calculate according to the line loss change method of the substation or line; Determine whether there is a measurement reference point and calculate based on the measurement reference point.

2. The method for determining the time of electricity theft and calculating the amount of electricity according to claim 1 is characterized in that: The modified energy meter class determines the start time of electricity theft by retrieving the cover opening record of the energy meter. The calculation formula for the amount of electricity theft of the modified energy meter class is as follows: Where W Q The amount of electricity stolen; W E The electric energy value when the electricity theft is terminated; W S is the reading recorded in the cover opening record when the electricity theft occurred; K is the absolute value of the electric energy meter calibration error; k is the household's comprehensive multiplier, that is, the product of the voltage transformer multiplier and the current transformer multiplier.

3. The method for determining the time of electricity theft and calculating the amount of electricity according to claim 1, characterized in that: The voltage loss record category is divided into the voltage loss times of the electric energy meter within 10 times and the voltage loss times of the electric energy meter greater than 10 times; When the number of times the electric energy meter loses voltage is less than 10 times, the voltage loss record is used to determine the time of electricity theft, and the amount of electricity theft is calculated by multiplying the ampere-hours of the voltage loss phase during each voltage loss period by the voltage and power factor. The calculation formula for the amount of electricity theft is as follows: Where: W Q is the amount of electricity stolen; U is the actual voltage of the electricity stolen phase; Ah n It is the number of ampere-hours of electricity stolen during the last n voltage loss periods, and n≤10; It is the average power factor of the household during normal electricity use. When the number of times the electric energy meter loses pressure is greater than 10 times, the total accumulated time of pressure loss in the electric energy meter is read and then converted into hours or days as the electricity theft time of the household. The amount of electricity theft is calculated by referring to the cumulative calculation algorithm in the typical load characteristic algorithm.

4. The method for determining the time of electricity theft and calculating the amount of electricity according to claim 1, characterized in that: The type of load data characteristic method applicable determines the start time of electricity theft based on the characteristic start time.

5. The method for determining the time of electricity theft and calculating the amount of electricity according to claim 1, characterized in that: The calculation formula for the amount of electricity stolen that can be calculated with the correction coefficient is as follows: Where K is the correction coefficient; P T is the correct power expression; P F is the expression of the error power in the power stealing state. W Q =(W E -W S )×(K-1)×k, Where: W Q The amount of electricity stolen; W E The electric energy value when the electricity theft is terminated; W S is the electric energy expressed when electricity theft occurs; k is the household's comprehensive multiplier, which is the product of the voltage transformer multiplier and the current transformer multiplier.

6. The method for determining the time of electricity theft and calculating the amount of electricity according to claim 1, characterized in that: The calculation formula for the amount of electricity stolen of the installation reference point measurement error category is as follows: In the formula, K D is the difference rate; W R The power of the reference metering device installed; W M It is the electricity quantity of the billing electric energy meter in the state of electricity theft. W Q =(W E -W S )×(K D -1)×k, where: W Q The amount of electricity stolen; W E The electric energy value when the electricity theft is terminated; W S is the electric energy expressed when electricity theft occurs; k is the household's comprehensive multiplier, which is the product of the voltage transformer multiplier and the current transformer multiplier.

7. The method for determining the time of electricity theft and calculating the amount of electricity according to claim 1, characterized in that: The calculation formula for the cumulative amount of stolen electricity is as follows: Where W Q is the stolen electricity amount; U is the stolen electricity phase voltage value; I is the current value of the power-stealing phase loss; is the average power factor of the household during normal electricity use; T is the time difference between load data points. If it is hourly data, T=1h; if it is half-hourly data, T=0.5h; if it is every 15 minutes data, T=0.25h; if it is every 5 minutes data, T=1 / 12h; if it is every minute data, T=1 / 60h.

8. The method for determining the time of electricity theft and calculating the amount of electricity according to claim 1, characterized in that: The method of line loss change in the substation or line determines the start time of electricity theft by returning the line loss to normal level after investigation and punishment. The calculation formula of the amount of electricity theft is as follows: W Q =W G ×(L F -L T ), Where W Q The amount of electricity stolen; W G is the total power supply during the power theft period; L F , L T They are the average line loss rates during electricity theft and normal periods respectively.

9. The method for determining the time of electricity theft and calculating the amount of electricity according to claim 1, characterized in that: The calculation formula for the amount of electricity stolen in the existing metering reference point calculation class is as follows: Where W Q The amount of electricity stolen; W n The power measured by the user's internal reference meter n; W M The amount of electricity measured by the billing energy meter installed by the power supply company; W L The transformer loss or line loss between the user's internal reference meter and the billing electricity meter installed by the power supply company is borne by the user.

10. The method for determining the time of electricity theft and calculating the amount of electricity according to claim 1, characterized in that: If the above electricity theft type is not met, the start time and the amount of electricity theft are determined by other reasonable estimation methods.

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