A resident household electric leakage monitoring method and system based on a power utilization information collection system

Abstract

This invention discloses a method and system for monitoring residential leakage current based on an electricity information collection system. The method includes the following steps: acquiring live wire current data and neutral wire current data of the electricity meter at multiple hourly intervals within a preset time period; calculating the difference between the absolute value of the live wire current and the absolute value of the neutral wire current at each hourly interval to generate a difference sequence; filtering and removing users whose neutral wire current data is all zero according to the difference sequence, and designating the remaining users as users to be assessed; determining whether the minimum value in the difference sequence of the users to be assessed is greater than a first preset threshold; if so, determining that they have fixed leakage current characteristics; calculating the ratio of the differences between adjacent time intervals, and calculating its dispersion index based on the ratio, determining whether the dispersion index is less than a second preset threshold; if so, determining that the users to be assessed have fixed leakage current. This invention has the advantages of realizing normalized and automated monitoring of fixed leakage current in residential households.

Description

Technical Field

[0001] This invention mainly relates to the field of residential leakage current monitoring technology, specifically to a residential leakage current monitoring method and system based on an electricity consumption information collection system. Background Technology

[0002] In residential households, leakage current caused by damaged indoor wiring or contact between the casing of electrical equipment and the live wire typically trips the main circuit breaker. However, some households experience frequent tripping, leading to the disabling of the leakage protection function on their main circuit breaker. In other cases, the leakage protection function of the main circuit breaker may fail, preventing it from tripping. Simultaneously, due to small leakage current or a malfunctioning leakage protection function of the transformer substation's outgoing circuit breaker, the outgoing circuit breaker may not trip. Statistics show that the reliable tripping rate of residential main circuit breakers during leakage current leakage is less than 70%, resulting in persistent leakage for some residents, posing electrical safety hazards, and increasing electricity bills.

[0003] Currently, monitoring of leakage current in residential households generally involves manual on-site measurement using clamp meters, with investigations conducted step by step. For remote analysis, historical data on the live and neutral wire currents of residential households is typically analyzed. Electricity information collection systems collect the live and neutral wire currents at 24:00 from residential meters, and comparisons can be used to determine if a user is engaging in electricity theft, leakage, or metering malfunctions. For users with normal electricity usage, the live wire current equals the neutral wire current at any given time. For users engaging in electricity theft, the live wire current is less than the neutral wire current, and for users with leakage, the live wire current is greater than the neutral wire current. However, due to the large number of users sharing a neutral wire, the live wire current may also exceed the neutral wire current, making it impossible to distinguish between these two situations. Ultimately, manual on-site measurement remains the only option, which is neither comprehensive nor timely. Summary of the Invention

[0004] To address the technical problems existing in the prior art, this invention provides a method and system for monitoring residential leakage current based on an electricity consumption information collection system, enabling routine and automated monitoring of residential fixed leakage current.

[0005] To solve the above-mentioned technical problems, the technical solution proposed by this invention is as follows: A method for monitoring leakage current in residential households based on an electricity consumption information collection system includes the following steps: S1. Obtain the live wire current data and neutral wire current data of the electricity meter of the household to be monitored at multiple full hours within a preset time period, and use them as input data; S2. Based on the input data, calculate the difference between the absolute value of the live wire current and the absolute value of the neutral wire current at each hour, and generate a difference sequence; S3. Based on the difference sequence, filter and remove users whose neutral current data are all zero, and keep the remaining users as users to be evaluated; S4. Determine whether the minimum value in the difference sequence of the user to be analyzed is greater than a first preset threshold; if so, determine that the user to be analyzed has a fixed leakage current characteristic. S5. Based on the difference sequence with fixed leakage characteristics, calculate the ratio of the differences between adjacent time points, and calculate its dispersion index based on the ratio, and determine whether the dispersion index is less than a second preset threshold; if so, determine that the user to be assessed has fixed leakage.

[0006] Preferably, in step S1, the preset time period is one day, and the plurality of hourly moments are 24 hourly moments.

[0007] Preferably, in step S2, the formula for calculating the difference is: ΔI j =ABS(ABS(I Lj )-ABS(I Nj )) Among them, I Lj Let I be the live wire current at the j-th integer point. Nj Let ΔI be the neutral current at the j-th integer point. j It is the difference between the absolute value of the live wire current and the absolute value of the neutral wire current at the j-th integer point.

[0008] Preferably, in step S3, the process of filtering and removing users whose neutral current data is all zero according to the difference sequence is as follows: if the absolute value of the neutral current at all times is less than or equal to the preset current threshold, then it is determined that the user's neutral current data is all zero.

[0009] Preferably, in step S5, the ratio of the differences between adjacent time points... The calculation formula is: j=1,2,…,n-1 Where n is the number of times the clock strikes the hour. Let be the difference at the j-th integer point. It represents the difference at the (j+1)th integer point.

[0010] Preferably, the dispersion index k is the root mean square of the ratio, and the calculation formula is: .

[0011] Preferably, after determining that the user to be assessed has a fixed leakage current, an estimated value of the leakage current is calculated. The calculation formula is:

[0012] Where n is the number of times the clock strikes the hour. Let be the difference at the j-th integer point.

[0013] The present invention also discloses a computer program product, comprising a computer program that, when executed by a processor, performs the steps of the method described above.

[0014] The present invention further discloses a computer-readable storage medium having a computer program stored thereon, the computer program executing the steps of the method described above when run by a processor.

[0015] The present invention also discloses a residential leakage current monitoring system based on an electricity information collection system, comprising a memory and a processor connected to each other, wherein the memory stores a computer program, and the computer program executes the steps of the method described above when run by the processor.

[0016] Compared with the prior art, the advantages of the present invention are as follows: This invention only requires the use of historical data from existing electricity information collection systems, without the need for on-site measurement or the establishment of on-site monitoring systems. It achieves routine and automated monitoring of residential fixed leakage current, provides personalized energy services for residents, reduces electricity costs, and improves the level of safe electricity use. It has the advantages of low implementation cost, high identification accuracy, and strong scalability. Attached Figure Description

[0017] Figure 1 Wiring diagram for users with a common neutral wire.

[0018] Figure 2 This is a wiring diagram for a typical leakage current user.

[0019] Figure 3 This is a schematic diagram of the meter terminals being reversed.

[0020] Figure 4 This is a schematic diagram of the switch being reversed after the meter.

[0021] Figure 5 This is a flowchart of a residential leakage current monitoring method based on an electricity information collection system, according to an embodiment of the present invention. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] This analysis examines the leakage characteristics of residential households, focusing on users with a common neutral wire: there are several scenarios involving a common neutral wire. Figure 1 The live wire currents from both households converge at point O after passing through the appliances, and then split back to the neutral wires of the two meters. The magnitude of the current split between meters A and B is determined by the neutral wire loop impedance of each meter. If the impedance of meter A is less than that of meter B, the neutral wire current distribution is as shown in Table 1. L1 I N1 IL2 I N2 Table 1 shows the live and neutral currents for meters A and B, respectively. As can be seen from Table 1, the magnitude of the neutral current is related to the meter impedance and the user's electricity consumption. Since the meter impedance and electricity consumption of users are unpredictable, the ratio of live to neutral current in a single meter is not fixed.

[0024]

[0025] Further analysis of leakage current user characteristics: User leakage current is generally caused by grounding damage to wires or grounding of electrical equipment. The grounding resistance is fixed, and the leakage current is relatively fixed. Figure 2 As shown, the live wire current enters the meter from terminal 1 and flows out into the house from terminal 2. The leakage current I0 goes to ground, and I1 returns through the appliance via the neutral wire at terminals 4 and 3. The live wire current measured by the meter is greater than the neutral wire current, and the difference between the live wire and neutral wire currents is a fixed value of I0. However, some users with leakage current may reverse the live and neutral wires due to difficulty in locating the leakage point, changing the live wire grounding to neutral wire grounding to reduce leakage current and continue using electricity. There are two ways to reverse the connection: reversing the meter terminals or reversing the switch after the meter, as shown below. Figure 3 , Figure 4 As shown.

[0026] When the live and neutral wires are reversed before the meter, the current in the live wire of the meter is I. N The meter's neutral current is I. L ; I N =I L -I0 I L >I N If the absolute value of the live wire current is less than the absolute value of the neutral wire current, the meter will under-measure. When the live and neutral wires are reversed after the meter, the live wire current will be I. L The meter's neutral current is I. N ; I N =I L -I0 I L >I N The meter's live wire current is greater than the neutral wire current, so the meter is measuring normally.

[0027] For continuous grounding, regardless of whether the live and neutral wires are reversed, the difference in absolute values ​​between the live and neutral wires will always be a fixed value for leakage current. If it's a case of shunting for electricity, the live wire current is less than the neutral wire current, but the shunting is proportional. Therefore, the difference in absolute values ​​between the live and neutral wires will vary, not be a fixed value. Analyzing data from operating meters reveals a special case: some electricity meters only have a single wire connected to the neutral wire, and the neutral wire current is not measured, resulting in a zero neutral wire current on the meter. In cases where the user load is relatively uniform, the difference in live and neutral wire values ​​tends to be consistent.

[0028] Based on the above analysis, the residential leakage current monitoring method based on an electricity information collection system provided in this embodiment of the invention is as follows: Figure 5 As shown, the specific steps include: S1. Data Acquisition and Preprocessing The live wire current data of the electricity meters of the residential users to be monitored is obtained at 24 full hours throughout the day through the electricity information collection system. L1 I L2 ... I L24 and neutral current data I N1 I N2 ... I N24 The acquired data is preprocessed to calculate the absolute difference between the live wire current and the neutral wire current at each moment: ΔI1=ABS(ABS(I L1 )-ABS(I N1 )) ΔI2=ABS(ABS(I L2 )-ABS(I N2 )) … ΔI j =ABS(ABS(I Lj )-ABS(I Nj )) … ΔI 24 =ABS(ABS(I L24 )-ABS(I N24 )) S2. Preliminary Screening Users whose neutral current is all zero are excluded, thus satisfying max(I N1 I N2 ... I N24 Users with an A value greater than 0.05A proceed to the next judgment step; this step excludes users with a single neutral line. S3. Fixed Leakage Current Feature Identification Calculate the minimum value of the 24 differences, min(ΔI1, ΔI2, ..., ΔI). 24); If this minimum value is greater than the preset threshold M1, it indicates that the difference between the live wire and the neutral wire at all time points is greater than the preset threshold M1, then there may be a fixed leakage current; where M1 is set to 0.05 A according to the statistical data of the power distribution area history. S4. Leakage consistency test To distinguish fixed leakage from other abnormal situations such as common neutral wire and shunt power theft, further calculate the ratio of the differences at adjacent times: , ,…, ,…,

[0029] If there is fixed leakage in a household, the leakage current value is basically constant, and the differences at each time point are close to being the same, that is, k1, k2,..., k 23 are close to 1.

[0030] To quantitatively evaluate the consistency, calculate the root mean square of 23 ratios:

[0031] When k < M2, the root mean square of the difference ratios is less than the threshold M2, indicating that the volatility of the differences is small, with strong consistency, and the user has leakage, rather than shunt power theft or common neutral wire; where M2 is set to 0.1. S5. Leakage current estimation Under the conditions that meet the requirements of steps S3 and S4, calculate the average leakage current of the user within the day ; This average value is used as the estimated value of the leakage current of this user.

[0032] This invention only needs to utilize the historical data of the existing power consumption information collection system, without on-site measurement or establishing an on-site monitoring system, and realizes the normal and automatic monitoring of residential fixed leakage, provides personalized energy consumption services for residents, reduces electricity bill support, improves the level of safe electricity use, and has the advantages of low implementation cost, high recognition accuracy, and strong scalability.

[0033] To verify the effectiveness of the above method, 4 residential users within the jurisdiction of a certain power supply company are selected for actual verification, the method of the embodiment of this invention is used for analysis, and the results are compared with the on-site measurement results. The specific verification process is as follows: Extract the live wire and neutral wire current data at 24:00 on July 7, 2025 of 4 users from the power consumption information collection system, calculate and analyze according to the steps of the above method, and compare the estimated leakage current obtained from the analysis with the leakage current value measured on-site by the staff using a clamp meter. The verification results are shown in Table 2: Table 2

[0034] The verification results show that the leakage current estimated by the method of this embodiment of the invention is basically consistent with the actual on-site measurement value, and can effectively identify users with fixed leakage current. All verified users met the judgment conditions of steps S2 to S4, and were confirmed as leakage current users after on-site investigation, demonstrating high analysis accuracy.

[0035] This invention also discloses a computer program product, including a computer program that, when run by a processor, performs the steps of the method described above. This invention further discloses a computer-readable storage medium storing a computer program that, when run by a processor, performs the steps of the method described above. This invention also discloses a residential leakage current monitoring system based on an electricity consumption information collection system, including an interconnected memory and a processor. The memory stores a computer program that, when run by a processor, performs the steps of the method described above. The products, media, and systems of this invention, corresponding to the methods described above, also possess the advantages described above.

[0036] The present invention can implement all or part of the processes in the methods of the above embodiments, or it can be implemented by hardware related to computer program instructions. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, it can implement the steps of the above method embodiments. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or some intermediate form. The computer-readable storage medium includes: any entity or device capable of carrying computer program code, recording media, USB flash drive, portable hard drive, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. The memory is used to store computer programs and / or modules. The processor implements various functions by running or executing the computer programs and / or modules stored in the memory, and by calling data stored in the memory. The memory may include high-speed random access memory, as well as non-volatile memory, such as hard disks, RAM, plug-in hard disks, smart media cards (SMC), secure digital (SD) cards, flash cards, at least one disk storage device, flash memory device, or other volatile solid-state storage devices.

[0037] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should be considered within the scope of protection of the present invention.

Claims

1. A method for monitoring leakage current in residential households based on an electricity consumption information collection system, characterized in that, Includes the following steps: S1. Obtain the live wire current data and neutral wire current data of the electricity meter of the household to be monitored at multiple full hours within a preset time period, and use them as input data; S2. Based on the input data, calculate the difference between the absolute value of the live wire current and the absolute value of the neutral wire current at each hour, and generate a difference sequence; S3. Based on the difference sequence, filter and remove users whose neutral current data are all zero, and keep the remaining users as users to be evaluated; S4. Determine whether the minimum value in the difference sequence of the user to be analyzed is greater than a first preset threshold; if so, determine that the user to be analyzed has a fixed leakage current characteristic. S5. Based on the difference sequence with fixed leakage characteristics, calculate the ratio of the differences between adjacent time points, and calculate its dispersion index based on the ratio, and determine whether the dispersion index is less than a second preset threshold; if so, determine that the user to be assessed has fixed leakage.

2. The residential leakage current monitoring method based on an electricity information collection system according to claim 1, characterized in that, In step S1, the preset time period is one day, and the multiple hourly moments are 24 hourly moments.

3. The method for monitoring residential leakage current based on an electricity information collection system according to claim 1, characterized in that, In step S2, the formula for calculating the difference is: ΔI j =ABS(ABS(I Lj )-ABS(I Nj )) Among them, I Lj Let I be the live wire current at the j-th integer point. Nj Let ΔI be the neutral current at the j-th integer point. j It is the difference between the absolute value of the live wire current and the absolute value of the neutral wire current at the j-th integer point.

4. The method for monitoring residential leakage current based on an electricity information collection system according to claim 1, 2, or 3, characterized in that, In step S3, the process of filtering and removing users whose neutral current data is all zero according to the difference sequence is as follows: if the absolute value of the neutral current at all times is less than or equal to the preset current threshold, then it is determined that the user's neutral current data is all zero.

5. The method for monitoring residential leakage current based on an electricity information collection system according to claim 1, 2, or 3, characterized in that, In step S5, the ratio of the differences between adjacent time points The calculation formula is: j=1,2,…,n-1 Where n is the number of times the clock strikes the hour. Let be the difference at the j-th integer point. It represents the difference at the (j+1)th integer point.

6. The residential leakage current monitoring method based on an electricity information collection system according to claim 5, characterized in that, The dispersion index k is the root mean square of the ratio, and its calculation formula is: 。 7. The method for monitoring residential leakage current based on an electricity information collection system according to claim 1, 2, or 3, characterized in that, After determining that the user under investigation has a fixed leakage current, the estimated leakage current value is calculated. The calculation formula is: Where n is the number of times the clock strikes the hour. Let be the difference at the j-th integer point.

8. A computer program product, comprising a computer program, characterized in that, The computer program is executed by the processor to perform the steps of the method as described in any one of claims 1-7.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, The computer program, when run by a processor, performs the steps of the method as described in any one of claims 1-7.

10. A residential leakage current monitoring system based on an electricity consumption information collection system, comprising a memory and a processor interconnected, wherein the memory stores a computer program, characterized in that, The computer program, when run by a processor, performs the steps of the method as described in any one of claims 1-7.

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