Electricity stealing detection method and device based on electromagnetic field signal

Abstract

The invention discloses an electromagnetic field signal-based electricity stealing detection method and device. A specific signal is sent to a to-be-detected cable; collecting magnetic field signals at different detection positions of the to-be-detected cable to obtain magnetic field signal data containing position information, and collecting reflected signals of the to-be-detected cable to obtain reflected signal data containing time information; performing comparative analysis processing on the acquired magnetic field signal data to obtain magnetic field signal intensity change characteristics; performing preliminary screening processing on the to-be-detected cable according to the magnetic field signal intensity change characteristics to obtain an electricity stealing position range of the to-be-detected cable; and calculating a standing-wave ratio in the range of the electricity stealing position based on the specific signal and the reflected signal, and analyzing the standing-wave ratio to obtain a detection result. According to the application, the electric larceny position range is screened out by analyzing the magnetic field intensity around the to-be-detected cable, and the electric larceny position of the to-be-detected cable is further analyzed in combination with the standing-wave ratio in the electric larceny position range, so that the electric larceny detection accuracy is ensured, and the method can also be applied to electric larceny detection of different cables.

Description

Technical Field

[0001] The present disclosure relates to the technical field of power systems, and in particular to a method and device for detecting electricity theft based on electromagnetic field signals. Background Art

[0002] With the development of my country's social economy, the demand for power supply has become wider and wider, but it also provides opportunities for electricity theft to a certain extent. And as power companies add a variety of anti-theft measures to electricity meters, the means of electricity theft by electricity thieves are constantly updated and more and more concealed, which makes it more difficult for power personnel to detect electricity theft.

[0003] At present, the most commonly used method of stealing electricity is to pre-bury a concealed cable on the line in front of the metering point. When stealing electricity, the pre-buried branch switch can be turned on to steal electricity. Therefore, power personnel are required to accurately detect the existence of branch cables and the specific location of the branch cables during inspections. However, in the existing power inspection work, it is difficult to detect this type of electricity theft manually and the detection process takes a long time.

[0004] The prior art document (CN103630717A) discloses a magnetic field and electromagnetic field interference electricity theft detection system and its detection device, including: an electromagnetic radiation sensor, used to obtain the current electric field strength signal of the electricity metering point and its surrounding area; a magnetic field sensor, used to obtain the current magnetic induction strength signal of the electricity metering point and its surrounding area; a positioning module, used to obtain the current detection position of the electricity theft detection device; a central processing unit, used to receive the electric field strength signal, the magnetic induction strength signal and the detection position, and output the electric field strength signal that exceeds the electric field strength threshold, and / or the magnetic induction strength signal that exceeds the magnetic induction strength threshold, and the corresponding detection position as detection data; a wireless communication module, used to receive the detection data sent by the central processing unit, and send it to the host computer through the wireless communication network.

[0005] However, the existing technology needs to set different and specific electric field strength thresholds and magnetic field strength thresholds according to different actual operating conditions of the cables, and cannot be directly applied to different cable electricity theft detection tasks.

[0006] Therefore, it is necessary to provide a new technical solution to improve one or more problems existing in the above solutions.

[0007] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0008] In order to solve the deficiencies in the prior art, the present invention provides a method and device for detecting electricity theft based on electromagnetic field signals, which not only improves the accuracy of electricity theft detection, but also can be applied to different cable electricity theft detections.

[0009] The present invention adopts the following technical solution.

[0010] A first aspect of the present invention provides a method for detecting electricity theft based on electromagnetic field signals, comprising:

[0011] A specific signal is sent to the cable to be tested to generate an electromagnetic field around the cable to be tested; magnetic field signals are collected at different detection positions of the cable to be tested to obtain magnetic field signal data containing position information, and a reflection signal of the cable to be tested is collected to obtain reflection signal data containing time information; the collected magnetic field signal data are compared and analyzed to obtain magnetic field signal intensity change information; preliminary screening is performed on the cable to be tested according to the magnetic field signal intensity change information to obtain the power theft position range of the cable to be tested; the standing wave ratio within the power theft position range is calculated based on the specific signal and the reflection signal data, and the standing wave ratio is analyzed to obtain the detection result.

[0012] Optionally, the collected magnetic field signal data is subjected to comparative analysis and processing to obtain the magnetic field signal strength change information, including: comparative analysis of the collected magnetic field signal data according to signal strength; drawing a magnetic field signal strength change graph with the detection position as the horizontal coordinate and the signal strength as the vertical coordinate based on the analysis results; and extracting the magnetic field signal strength change information from the magnetic field signal strength change graph.

[0013] Optionally, the cable to be tested is preliminarily screened and processed according to the magnetic field signal strength change information to obtain the electricity theft position range of the cable to be tested, including: judging whether the magnetic field signal strength change information meets preset conditions; the detection position corresponding to the magnetic field signal strength change information that meets the preset conditions is included in the electricity theft position range of the cable to be tested to obtain the electricity theft position range of the cable to be tested; the preset condition is that the magnetic field signal strength of the cable to be tested shows a sudden increase trend.

[0014] Optionally, when the standing wave ratio within the power theft location range is greater than 1.5, the cable location corresponding to the standing wave ratio is determined as the power theft location.

[0015] Optionally, the standing wave ratio within the power theft location range is calculated based on the specific signal and the reflected signal data by the following formula:

[0016]

[0017]

[0018] in,

[0019] SWR stands for standing wave ratio.

[0020] Γ is the reflection coefficient,

[0021] P reflected Indicates the intensity of the collected reflection signal.

[0022] P incident Indicates the strength of the specific signal transmitted into the cable under test.

[0023] Optionally, the power of the specific signal ranges from 10W to 15W.

[0024] Optionally, before performing comparative analysis on the collected magnetic field signal, the method further includes: filtering the received magnetic field signal; performing analog amplification on the filtered magnetic field signal; and performing analog-to-digital conversion on the analog amplified magnetic field signal.

[0025] The second aspect of the present invention provides an electricity theft detection device, which includes: a signal generator, a detector, a signal receiver, a locator and a central processing unit. The signal generator is used to send a specific signal to the cable to be tested to generate an electromagnetic field around the cable to be tested; the detector is used to collect magnetic field signals at different detection positions of the cable to be tested to obtain magnetic field signal data containing position information; the signal receiver is used to collect the reflection signal of the cable to be tested to obtain reflection signal data containing time information; the locator is used to obtain the current detection position of the electricity theft detection device; the central processing unit is connected to the signal generator, the detector and the locator respectively, and the central processing unit is used to control the signal generator, the detector and the locator, and after analyzing and processing the magnetic field signal and the detection position data, determine whether electricity theft occurs in the cable to be tested, and when electricity theft occurs, determine the location of electricity theft and obtain the detection result.

[0026] Optionally, the central processing unit includes: a signal processing module and a data processing module. The signal processing module is connected to the detector and is used to perform signal conditioning on the magnetic field signal. The data processing module is connected to the signal processing module and the locator and is used to compare and analyze the magnetic field signal processed by the signal processing module and the detection position data.

[0027] Optionally, the signal processing module includes: a filter unit, an amplification unit and a conversion unit connected in sequence. The filter unit is used to filter the magnetic field signal collected by the detector. The amplification unit is used to perform analog amplification processing on the signal processed by the filter unit. The conversion unit is used to perform analog-to-digital conversion processing on the signal processed by the amplification unit.

[0028] Optionally, the electricity theft detection device further includes: a display connected to the central processing unit for displaying the analysis and processing results to the user.

[0029] A third aspect of the present invention provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program implements the above-mentioned method for detecting electricity theft when loaded into the processor.

[0030] A fourth aspect of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the above-mentioned method for detecting electricity theft is implemented.

[0031] Compared with the prior art, the beneficial effects of the present invention include at least:

[0032] In an embodiment of the present invention, an electromagnetic field is generated around the cable to be tested by sending a specific signal to the cable to be tested, and magnetic field signals are collected at different detection positions of the cable to be tested to obtain magnetic field signal data containing position information; in the process of electricity theft judgment, the cable to be tested is first preliminarily screened according to the signal strength change characteristics to obtain the electricity theft position range of the cable to be tested, that is, the cable part on the cable to be tested where electricity theft may exist is preliminarily locked, and then the electricity theft position of the cable to be tested is further analyzed in combination with the standing wave ratio at the electricity theft position range. In summary, the method proposed in this embodiment can realize electricity theft detection in a non-contact detection mode on the one hand, and can be detected without installation, which is convenient for operation and saves time. On the other hand, the above-mentioned preliminary screening process and standing wave ratio judgment process can further improve the accuracy of electricity theft detection, and it is more conducive to the investigation of concealed electricity theft. Moreover, the present invention does not need to set the corresponding specific electric field strength threshold and magnetic field strength threshold according to the actual operating conditions of the cable, and has a wider scope of application; while ensuring the accuracy of electricity theft detection, it can also be applied to different cable electricity theft detection work.

[0033] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0035] Figure 1 It is a schematic diagram of a flow chart of a method for detecting electricity theft provided by an embodiment of the present invention;

[0036] Figure 2 The present invention provides a schematic block diagram of a power theft detection device. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described in this application are only embodiments of a part of the present invention, rather than all embodiments. Based on the spirit of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the present invention.

[0038] Combination Figure 1 As shown, Embodiment 1 of the present invention provides a method for detecting electricity theft based on electromagnetic field signals, which may include the following steps:

[0039] S101: Sending a specific signal to the cable under test to generate an electromagnetic field around the cable under test, and the cable under test is in a running state.

[0040] In one embodiment, in S101, a specific signal is sent to the cable to be tested to generate an electromagnetic field around the cable to be tested. A high-frequency signal generator may be used to send the specific signal to the cable to be tested, wherein the specific signal is a high-frequency signal. The high-frequency signal generator sends a high-frequency signal to the cable to be tested to generate an electromagnetic field around the cable to be tested. The power of the high-frequency signal generator may be adjusted to ensure that the electromagnetic field strength of the cable to be tested is stable, so that the detector can easily detect the magnetic field signal generated around the cable to be tested.

[0041] Optionally, the specific signal in S101 can select a high-frequency signal with a frequency of 1kHz to 20MHz. Selecting a high-frequency signal within this frequency range can ensure penetration of the cable to be tested without causing damage to the cable to be tested itself. The operating frequency of the specific signal can be selected according to specific detection requirements and technical means, without being limited to a multiple relationship with the cable operating frequency.

[0042] However, it should be noted that the selection of the specific frequency value of a specific signal depends on factors such as the type and length of the cable to be tested and the surrounding environment. For example, for a shorter cable to be tested, a signal with a relatively high frequency can be selected; while for a longer cable, a signal with a relatively low frequency needs to be selected to ensure effective signal transmission.

[0043] Optionally, the specific signal in S101 can be a sine wave signal. On the one hand, the sine wave signal is easier to generate, and on the other hand, the sine wave signal can clearly reflect the impedance change in the cable to be tested.

[0044] Optionally, the strength of the specific signal in S101 can be selected to be 10W to 15W to ensure that the signal is effectively propagated in the cable under test, to avoid damage to the equipment due to excessive signal strength or failure to detect due to insufficient signal strength, and to ensure that the electromagnetic field strength formed around the cable under test is stable for easy collection and analysis.

[0045] Optionally, before sending a specific signal to the cable to be tested, the specific signal may be modulated by amplitude modulation, frequency modulation or phase modulation to improve the interference capability of the signal.

[0046] S102: collecting magnetic field signals at different detection positions of the cable to be tested respectively to obtain magnetic field signal data containing position information, and collecting reflection signals of the cable to be tested to obtain reflection signal data containing time information.

[0047] In one embodiment, in S102, magnetic field signals are collected at different detection positions of the cable to be tested to obtain magnetic field signal data containing position information. In this embodiment, a detector can be used to perform non-contact detection and collection of magnetic field signals in the magnetic field area around the cable to be tested, without the need to install the detector on the cable to be tested, so that power personnel can perform detection operations anytime and anywhere.

[0048] In one embodiment, the reflected signal of the cable under test is collected in S102 to obtain reflected signal data containing time information. In this embodiment, a signal receiver can be used to collect the reflected signal of the cable under test. During the detection, the signal receiver needs to be installed on the cable under test to collect the wave signal reflected after a specific signal is transmitted to the cable under test.

[0049] It should be noted that during the detection, the high-frequency signal generator and the signal receiver are connected to the same end of the cable to be tested to ensure that the high-frequency characteristic signal can be injected into the cable to be tested. The other end of the cable to be tested is connected to the load, and the detector is placed along the cable to be tested or at the key detection point. When the high-frequency signal is transmitted to the cable to be tested, the cable to be tested must be in normal operation to ensure that the signal propagates in the cable to be tested. When the high-frequency signal is sent to the cable to be tested, the high-frequency signal will propagate in the cable to be tested, and then an electromagnetic field will be formed around the cable to be tested. During the detection, the detector can be used to collect the magnetic field signal formed around the cable to be tested, and the magnetic field signal can be analyzed to determine whether there is electricity theft in the cable to be tested; during the detection, the signal receiver can also be used to receive the reflected signal reflected back by the cable to be tested when it encounters an impedance point, and then the cable to be tested is analyzed for electricity theft in combination with the electromagnetic field signal.

[0050] It should be explained that the electromagnetic induction principle is used to detect the electromagnetic changes in the environment around the cable under test, so that the detector can detect and collect the magnetic field signals around the cable under test in a non-contact manner. When there is a signal transmission in the cable under test, the cable under test will generate an electromagnetic field around it, and the detector can sense the existence and strength of the electromagnetic field by receiving these electromagnetic waves.

[0051] Furthermore, the sensor in the above-mentioned detector may include an electromagnetic radiation sensor element, and the electromagnetic radiation sensor element is used to collect the electric field strength signal in the electromagnetic field area around the cable to be tested.

[0052] S103: Comparatively analyzing and processing the collected magnetic field signal data to obtain magnetic field signal intensity change information.

[0053] S103 includes: comparing and analyzing the collected magnetic field signal data to obtain the magnetic field signal strength change information, including: comparing and analyzing the collected magnetic field signal data according to the signal strength; drawing a magnetic field signal strength change graph with the detection position as the horizontal coordinate and the signal strength as the vertical coordinate according to the analysis results; and extracting the magnetic field signal strength change information from the magnetic field signal strength change graph.

[0054] In one embodiment, the collected magnetic field signal data is compared and analyzed in S103 to obtain the magnetic field signal strength change information. Specifically, by comparing and analyzing the collected magnetic field signal data according to the signal strength, a magnetic field signal strength change graph with the detection position as the horizontal coordinate and the magnetic field signal strength as the vertical coordinate can be drawn for the cable to be tested, and the magnetic field signal strength change information is extracted from the magnetic field signal strength change graph, which is conducive to the subsequent accurate positioning of the power theft range.

[0055] The above magnetic induction signal strength variation diagram is obtained by comparing and analyzing the magnetic induction signal collected in S102. The above S103 setting is especially for the situation where there are multiple power thefts on the cable to be tested, which is more conducive to determining multiple power theft locations based on the magnetic field signal strength variation information extracted from the magnetic field signal strength variation diagram.

[0056] S104: Preliminary screening is performed on the cable to be tested according to the variation characteristics of the magnetic field signal strength to obtain a power theft location range of the cable to be tested.

[0057] S104 includes: determining whether the magnetic field signal strength change information meets a preset condition; assigning the detection position corresponding to the magnetic field signal strength change information that meets the preset condition to the power theft position range of the cable to be tested, to obtain the power theft position range of the cable to be tested; the preset condition is that the magnetic field signal strength of the cable to be tested presents a sudden increase trend.

[0058] Specifically, the following formula is used to determine whether the magnetic field signal strength of the cable to be tested shows a sudden increase trend:

[0059]

[0060] Wherein, k represents the rate at which the magnetic field strength changes with distance, H represents the magnetic field signal strength around the cable to be tested, and r represents the distance between the detector and the cable to be tested in the radial direction of the cable to be tested. When the change rate of the k value exceeds 10%, it is considered that the magnetic field signal strength has a sudden increase, and the position within a certain range (e.g., one meter or two meters nearby) near the detection position corresponding to the sudden increase is determined as the power theft position range.

[0061] Specifically, according to the above-mentioned preliminary screening and processing standards, the magnetic field signal strength change information extracted from the magnetic field signal strength change diagram is analyzed. For the cable to be tested, combined with the above-mentioned magnetic induction signal strength change information, the position range where the magnetic field signal strength shows a sudden increase trend is selected and classified into the power theft position range, so as to further analyze the electromagnetic field signal strength within the power theft position range in the future, so as to detect the power theft position more accurately.

[0062] For example, when the cable to be tested is infinitely long, the magnetic field strength around the cable to be tested mainly depends on the current in the cable to be tested and the distance between the detector and the cable to be tested. The following is a calculation formula for the magnetic field signal strength around the cable to be tested:

[0063]

[0064] Wherein, H represents the magnetic field signal strength around the cable to be tested, I represents the current in the cable to be tested, and r represents the distance between the detector and the cable to be tested in the radial direction of the cable to be tested.

[0065] It can be seen that if there is electricity theft in the cable to be tested, the current density at the theft point will be greater than the current density in other areas of the cable, which will cause the magnetic field signal strength at the theft point to increase accordingly.

[0066] It needs to be explained that after a specific signal is injected into the cable under test, the specific signal will propagate along the cable under test. If there is no power theft in the cable under test, the resistance in the cable under test is relatively stable, and the current in the cable under test is also relatively stable. Therefore, the magnetic field around the cable under test is evenly distributed.

[0067] It is also necessary to explain that if there is electricity theft in the cable to be tested, the illegal access to the circuit will change the original current path and distribution of the cable to be tested, thereby causing the resistance of the cable to be tested to change, and because the current density at the electricity theft point is greater than the current density at other areas of the cable, the magnetic field signal strength at the electricity theft point of the cable to be tested is relatively strong compared to other positions of the cable to be tested. It can be further concluded that in areas where electricity theft exists, there will be a corresponding sudden increase in the magnetic field signal strength, so the standard for preliminary screening processing can be set as: the magnetic field signal strength of the cable to be tested shows a sudden increase trend.

[0068] If there is electricity theft in the cable under test, the illegal access to the circuit will change the original current path and distribution of the cable under test, which will cause the resistance of the cable under test to change. When the impedance of the cable under test changes, a reflection signal will be generated in the cable under test accordingly. This reflection signal will change the electromagnetic field distribution around the cable. Therefore, it can be seen that if there is an electricity theft point in the cable under test, if a high-frequency signal is transmitted to the cable under test, on the one hand, the magnetic field distribution at different positions on the cable under test will be different, and on the other hand, a reflection signal will be generated in the cable under test accordingly.

[0069] S105: Calculate the standing wave ratio at the power theft location range based on the specific signal and the reflected signal, and analyze the standing wave ratio to obtain a detection result.

[0070] Optionally, in one embodiment, the standing wave ratio is calculated by the following formula:

[0071]

[0072] Where SWR stands for standing wave ratio, Γ stands for reflection coefficient, P reflected Indicates the intensity of the collected reflected signal, P incident Indicates the strength of a specific signal emitted to the cable under test. The signal strength can be expressed by the power of the signal and then brought into the above formula to solve the reflection coefficient.

[0073] In one embodiment, within the power theft location range, when the standing wave ratio is greater than 1.5, the location is the power theft location. Since the power theft behavior changes the characteristic impedance of the cable, causing more electromagnetic waves to be reflected back, the standing wave ratio of the cable segment where the power theft exists will increase significantly. By further measuring and analyzing the standing wave ratio changes of the cable, the location of the power theft point can be effectively located.

[0074] It should be noted that in S102 of this embodiment, the reflected signal of the cable to be tested is collected to obtain reflected signal data containing time information. The time information contained in the reflected signal can be used to determine the specific position on the cable where the impedance point exists, thereby reflecting the reflected signal, and then further lock the location of the electricity theft to obtain the detection result.

[0075] It should be explained that when the cable transmits electromagnetic waves normally, due to the uniformity of the medium, the electromagnetic waves will propagate smoothly along the cable to form a stable electromagnetic field distribution; when there is a theft point in the cable to be tested, such as illegal access to the load or line damage, this will cause impedance mismatch points (such as the theft point) in the cable to be tested, and the signal propagated in the cable to be tested will be reflected at the theft point, and the intensity and direction of the electromagnetic field near the theft point will also change. Therefore, the reflected signal can be further combined to analyze the theft location of the cable to be tested.

[0076] The standing wave ratio is an important parameter to measure the impedance matching degree in the RF system. It reflects the degree of signal reflection during transmission. Under normal circumstances, the standing wave ratio of the cable should be close to 1, indicating that the electromagnetic waves are almost completely absorbed without reflection; but in the case of power theft, since the electromagnetic waves will be reflected when encountering points with impedance mismatch during propagation, the impedance change at the power theft point will cause more electromagnetic waves to be reflected back, forming a larger standing wave ratio. It should be noted that as the amount of power theft increases, the current distribution in the cable will also change, which will further aggravate the reflection phenomenon of electromagnetic waves, thereby further increasing the standing wave ratio.

[0077] In S104, the cables to be tested are preliminarily screened according to the signal strength variation characteristics to obtain the power theft location range of the cables to be tested, and the power theft location range can be locked; next, the power theft analysis is further performed on the cables to be tested with a shorter length through the standing wave ratio, which is conducive to finding a more specific power theft location, while also ensuring that the entire analysis and calculation amount is not too large and the detection time is not too long.

[0078] In one embodiment, before the collected electromagnetic field signal is subjected to comparative analysis, the following steps are also included:

[0079] Performing filtering processing on the received magnetic field signal;

[0080] Performing analog amplification processing on the magnetic field signal after filtering;

[0081] The magnetic field signal after analog amplification is subjected to analog-to-digital conversion.

[0082] The above steps are used to implement signal conditioning of the magnetic field signal, thereby converting the collected magnetic field signal into a signal form suitable for subsequent comparative analysis and processing of the magnetic field signal.

[0083] In the embodiments of the present disclosure, a specific signal is sent to the cable to be tested so that an electromagnetic field is generated around the cable to be tested, and magnetic field signals are collected at different detection positions of the cable to be tested to obtain magnetic field signal data containing position information; in the process of determining electricity theft, the cable to be tested is first preliminarily screened according to the variation characteristics of the magnetic field signal intensity to obtain the electricity theft position range of the cable to be tested, that is, the cable part on the cable to be tested where electricity theft may occur is preliminarily locked, and then the electricity theft position of the cable to be tested is further analyzed in combination with the standing wave ratio at the electricity theft position range; in summary, the method proposed in this embodiment not only ensures the accuracy of electricity theft detection, but also can be applied to different cable electricity theft detections.

[0084] Combination Figure 2 As shown, Embodiment 2 of the present invention provides an electricity theft detection device, which includes a signal generator, a detector, a signal receiver, a locator and a central processing unit; wherein the signal generator is used to send a specific signal to the cable to be tested; the detector is used to collect electromagnetic field signals at each detection point; the signal receiver is used to collect the reflected signal of the cable to be tested; the locator is used to obtain the current detection position of the electricity theft detection device; the central processing unit is connected to the signal generator, the detector and the locator respectively, and the central processing unit is used to control the signal generator, the detector and the locator, and after analyzing and processing the electromagnetic field signal and the detection position data, determine whether electricity theft occurs in the cable to be tested, and when electricity theft occurs, determine the electricity theft position to obtain the detection result.

[0085] In the embodiments of the present disclosure, a specific signal is sent to the cable to be tested by a signal generator so that an electromagnetic field is generated around the cable to be tested, the current detection position of the electricity theft detection device can be obtained by a locator, and the magnetic field signal is collected at different detection positions of the cable to be tested by a detector to obtain magnetic field signal data containing position information; in the process of electricity theft judgment, the signal sending of the signal generator, the signal collection of the detector, and the acquisition of real-time detection position information of the electricity theft detection device by the locator can be controlled by a central processing unit, and the magnetic field signal and the detection position data can be analyzed and processed to obtain the detection result; in summary, the device proposed in this embodiment can realize non-contact detection of electricity theft, and detection can be performed without installation, which is convenient for operation and saves time.

[0086] Next, the above-mentioned means in this exemplary embodiment will be described in more detail.

[0087] In one embodiment, the electricity theft detection device further includes a display, which is connected to the central processor and is used to receive the detection result and display the detection result to the user, so that the user can intuitively obtain the detection result information.

[0088] In one embodiment, the central processor includes a signal processing module and a data processing module. The signal processing module is connected to the detector and is used to perform signal conditioning on the magnetic field signal, thereby converting the collected magnetic field signal into a signal form suitable for the data processing module to directly perform data processing. The data processing module is connected to the signal processing module and the locator and is used to compare and analyze the magnetic field signal processed by the signal processing module and the detection position data, so as to obtain signal strength change information by comparing the magnetic field signal data, and realize the power theft judgment processing.

[0089] Furthermore, the signal processing module includes a filter unit, an amplifying unit and a conversion unit connected in sequence, wherein the filter unit is used to filter the magnetic field signal collected by the detector, the amplifying unit is used to perform analog amplification processing on the signal processed by the filter unit, and the conversion unit is used to perform analog-to-digital conversion processing on the signal processed by the amplifying unit. The magnetic field signal is conditioned by the filter unit, the amplifying unit and the conversion unit, and the collected magnetic field signal is converted into a signal form suitable for the data processing module to directly perform data processing.

[0090] Furthermore, the central processor further includes a control module, which is connected to the signal generator and the detector respectively, and is used to control the start and shut down of the signal generator and the detector. For example, by sending an instruction to the signal generator, the signal generator can send a specific signal to the cable under test, and stop sending the specific signal to the cable under test; by sending an instruction to the detector, the detector can start collecting magnetic field signals in the electromagnetic field area around the cable under test, and stop collecting magnetic field signals in the electromagnetic field area around the cable under test.

[0091] Furthermore, the central processing unit also includes a storage module, which is respectively connected to the detector, the signal processing module and the data processing module, and is used to store the magnetic field signal data collected by the detector, the magnetic field signal data after signal modulation by the signal processing module, and various data generated during the processing of the magnetic field signal data by the data processing module.

[0092] In one embodiment, the signal generator may be a high-frequency signal generator, which may be composed of a microcontroller, a feature code generating unit, a carrier generating unit, a modulation unit and a coupling unit, wherein the microcontroller is used to receive an instruction to send a signal to the cable to be tested, and to send a control signal to the feature code generating unit, the feature code generating unit is used to receive the control signal of the microcontroller, and transmit the feature code to the modulation unit, the carrier generating unit generates a carrier and transmits the carrier to the modulation unit, the modulation unit modulates the feature code transmitted by the feature code generating unit and the carrier generated by the carrier generating unit and then outputs the signal, and the coupling unit couples the modulated signal and transmits it to the line of the cable to be tested. The above is only one structural setting of the signal generator, and the specific structure of the signal generator will not be described in detail in this application.

[0093] It should be noted that after using a high-frequency signal generator to send a high-frequency characteristic signal to the cable under test, an electromagnetic field with certain characteristics will be generated around the cable under test regardless of whether the cable under test is charged or not. During detection, a detector can be used to collect this characteristic magnetic field signal.

[0094] In one embodiment, the detector may be composed of a button portion, a display unit, a sensor, an amplifier, a bandpass filter, a phase-locked loop unit, an analog-to-digital converter and a microcontroller, wherein the button portion is used to transmit a control signal to the microcontroller, the microcontroller is used to receive instructions for collecting magnetic field signals around the cable to be tested, the display unit is used to display the signal processed by the microcontroller, the sensor is used to perform non-contact detection and collection of magnetic field signals in the electromagnetic field area around the cable to be tested, the amplifier amplifies the collected magnetic field signal and transmits it to the bandpass filter, the bandpass filter is used to detect the effective amplified magnetic field signal and transmit it to the phase-locked loop unit, the phase-locked loop unit is used to decouple the magnetic signal transmitted by the bandpass filter and transmit the obtained characteristic code to the analog-to-digital converter, the analog-to-digital converter is used to convert the characteristic code and transmit it to the microcontroller for identification, the microcontroller is used to receive the control signal of the button portion, and identify the characteristic code transmitted by the analog-to-digital converter and output it to the display unit.

[0095] Furthermore, the sensor of the detector includes an electromagnetic radiation sensor element and a magnetic field sensor element, the electromagnetic radiation sensor element is used to obtain an electric field strength signal, and the magnetic field sensor element is used to obtain a magnetic induction strength signal, so as to collect electric field strength signals and magnetic induction strength signals when collecting magnetic field signals at different detection positions of the cable to be tested.

[0096] Optionally, a telescopic rod is installed on the housing of the detector, which is convenient for power personnel to hold the electricity theft detection device to send and collect signals from the cables to be tested at different heights.

[0097] In one embodiment, the electricity theft detection device further includes a sound player, which is connected to the detector and the central processor. Under the control of the central processor, the sound player can adjust the volume according to the strength of the magnetic field signal collected by the detector, so that when the power personnel collect the magnetic field signal by holding the electricity theft detection device, they can first obtain a preliminary understanding and judgment of the strength of the magnetic field signal through the volume emitted by the sound player, and pre-mark the position where the volume emitted by the sound player is louder, so as to subsequently focus on judging whether the cable at the detection position has been stolen.

[0098] The locator in this embodiment is a GPS locator. While the control module of the central processing unit controls the detector to collect magnetic field signals, the central processing unit will also obtain the position information of the corresponding detection position from the locator, and associate the position information of the detection position with the magnetic field signal collected at the detection position, so as to confirm the electricity theft position on the cable to be tested based on the result of analyzing and processing the magnetic field signal by the data processing module.

[0099] Regarding the system in the above embodiment, the specific manner in which each unit performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0100] Embodiment 3 of the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is loaded into the processor, the method for detecting electricity theft based on electromagnetic field signals described in Embodiment 1 is implemented.

[0101] Embodiment 4 of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for detecting electricity theft based on electromagnetic field signals according to embodiment 1 is implemented.

[0102] Compared with the prior art, the beneficial effects of the present invention include at least:

[0103] On the one hand, the present invention can realize the detection of electricity theft by non-contact detection mode, and the detection can be carried out without installation, which is convenient for operation and saves time. On the other hand, with the help of the above-mentioned preliminary screening process and threshold judgment process, the accuracy of electricity theft detection can be further improved, and it is more conducive to the investigation of concealed electricity theft.

[0104] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0105] The present disclosure may be a system, a method and / or a computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present disclosure.

[0106] A computer-readable storage medium may be a tangible device that can hold and store instructions used by an instruction execution device. A computer-readable storage medium may be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples of computer-readable storage media (a non-exhaustive list) include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disk read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, such as a punch card or a raised structure in a groove on which instructions are stored, and any suitable combination of the foregoing. As used herein, a computer-readable storage medium is not to be interpreted as a transient signal per se, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., a light pulse through a fiber optic cable), or an electrical signal transmitted through a wire.

[0107] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, optical fiber transmissions, wireless transmissions, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in the computer-readable storage medium in each computing / processing device.

[0108] The computer program instructions for performing the operation of the present disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages, such as Smalltalk, C++, etc., and conventional procedural programming languages, such as "C" language or similar programming languages. Computer-readable program instructions may be executed completely on a user's computer, partially on a user's computer, as an independent software package, partially on a user's computer, partially on a remote computer, or completely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., using an Internet service provider to connect via the Internet). In some embodiments, an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA), may be customized by utilizing the state information of the computer-readable program instructions, and the electronic circuit may execute the computer-readable program instructions, thereby realizing various aspects of the present disclosure.

[0109] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for detecting electricity theft based on electromagnetic field signals, characterized in that: include: Sending a specific signal to the cable under test to generate an electromagnetic field around the cable under test; Collecting magnetic field signals at different detection positions of the cable to be tested respectively to obtain magnetic field signal data containing position information, and collecting reflection signals of the cable to be tested to obtain reflection signal data containing time information; Comparative analysis is performed on the collected magnetic field signal data to obtain information on changes in magnetic field signal strength; Performing preliminary screening of the cable to be tested according to the magnetic field signal strength change information to obtain a power theft location range of the cable to be tested; The standing wave ratio within the power theft location is calculated based on the specific signal and the reflected signal data, and the standing wave ratio is analyzed to obtain a detection result.

2. The method for detecting electricity theft based on electromagnetic field signals according to claim 1, characterized in that: The collected magnetic field signal data is compared and analyzed to obtain the magnetic field signal strength change information including: Compare and analyze the collected magnetic field signal data according to signal strength; Draw a magnetic field signal intensity variation diagram with the detection position as the horizontal coordinate and the signal intensity as the vertical coordinate according to the analysis results; Extract the magnetic field signal strength change information from the magnetic field signal strength change graph.

3. The method for detecting electricity theft based on electromagnetic field signals according to claim 1, characterized in that: The cable to be tested is preliminarily screened and processed according to the magnetic field signal strength change information, and the power theft location range of the cable to be tested includes: Determine whether the magnetic field signal strength change information meets the preset conditions; The detection position corresponding to the magnetic field signal strength change information that meets the preset conditions is included in the power theft position range of the cable to be tested, so as to obtain the power theft position range of the cable to be tested; The preset condition is that the magnetic field signal strength of the cable to be tested presents a sudden increase trend.

4. The method for detecting electricity theft based on electromagnetic field signals according to claim 1, characterized in that: When the standing wave ratio within the power theft location range is greater than 1.5, the cable location corresponding to the standing wave ratio is determined as the power theft location.

5. The method for detecting electricity theft based on electromagnetic field signals according to claim 1, characterized in that: The standing wave ratio within the power theft location is calculated based on the specific signal and the reflected signal data using the following formula: in, SWR stands for standing wave ratio. Γ is the reflection coefficient, P reflected Indicates the intensity of the collected reflected signal. P incident Indicates the strength of the specific signal transmitted into the cable under test.

6. The method for detecting electricity theft based on electromagnetic field signals according to any one of claims 1 to 5, characterized in that: The power of a specific signal ranges from 10W to 15W.

7. The method for detecting electricity theft based on electromagnetic field signals according to claim 6, characterized in that: Before performing comparative analysis on the collected magnetic field signals, the method further comprises: Performing filtering processing on the received magnetic field signal; Performing analog amplification processing on the magnetic field signal after filtering; The magnetic field signal after analog amplification is subjected to analog-to-digital conversion.

8. An electricity theft detection device using the electricity theft detection method based on electromagnetic field signals as claimed in any one of claims 1 to 7, characterized in that: The device comprises: A signal generator is used to send a specific signal to the cable under test to generate an electromagnetic field around the cable under test; The detector is used to collect magnetic field signals at different detection positions of the cable to be tested to obtain magnetic field signal data containing position information; A signal receiver, used for collecting the reflection signal of the cable to be tested, and obtaining reflection signal data containing time information; A locator, used to obtain the current detection position of the electricity theft detection device; A central processing unit is connected to the signal generator, the detector and the locator respectively. The central processing unit is used to control the signal generator, the detector and the locator, and to determine whether electricity theft occurs in the cable to be tested after analyzing and processing the magnetic field signal and the detection position data. When electricity theft occurs, the location of the electricity theft is determined to obtain the detection result.

9. The electricity theft detection device according to claim 8, characterized in that: The central processing unit comprises: A signal processing module, the signal processing module is connected to the detector and is used to perform signal conditioning on the magnetic field signal; A data processing module is connected to the signal processing module and the locator, and is used to compare and analyze the magnetic field signal processed by the signal processing module and the detected position data.

10. The electricity theft detection device according to claim 9, characterized in that: The signal processing module comprises: A filtering unit, an amplifying unit and a converting unit connected in sequence; The filtering unit is used to filter the magnetic field signal collected by the detector; The amplification unit is used to perform analog amplification processing on the signal processed by the filtering unit; The conversion unit is used to perform analog-to-digital conversion on the signal processed by the amplification unit.

11. The electricity theft detection device according to any one of claims 8 to 10, characterized in that: The electricity theft detection device also includes: A display is connected to the central processing unit and is used to display the analysis and processing results to a user.

12. An electronic device, comprising a processor and a storage medium; characterized in that: The storage medium is used to store instructions; The processor is used to operate according to the instructions to execute the steps of the electricity theft detection method based on electromagnetic field signals according to any one of claims 1 to 7.

13. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the electricity theft detection method based on electromagnetic field signals described in any one of claims 1 to 7 are implemented.

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