Method and device for detecting and positioning electric leakage of low-voltage transformer area, storage medium and equipment

Abstract

The invention provides a low-voltage transformer area electric leakage detection positioning method and device, a storage medium and equipment, and the method comprises the steps: outputting a characteristic current signal by a host according to a preset frequency, and inputting the characteristic current signal to a leakage transformer area line through a coupling clamp to form a characteristic current circulation; the first slave machine detects the characteristic current circulation of a high detection point of the leakage area, and determines a fault point according to the characteristic current circulation; the second slave machine detects the characteristic current circulation of the low detection point of the leakage area, and determines a fault point according to the characteristic current circulation; and the processor receives fault point information sent by the first slave and the second slave, and records specific fault point information of electric leakage of the low-voltage transformer area. Through cooperation of the low-voltage electric leakage detection and positioning system, electric leakage detection and fault point positioning of the low-voltage transformer area are rapidly realized under the condition of uninterruptible power supply, the electric leakage detection efficiency of the low-voltage transformer area is improved, and the influence of electric leakage detection on normal power utilization of a user is reduced.

Description

Technical Field

[0001] The present invention relates to the field of electric power systems, and in particular to a method, a device, a storage medium and equipment for detecting and locating leakage in a low-voltage area. Background Art

[0002] Low-voltage area refers to the low-voltage distribution network area between the secondary side of the distribution transformer and the user's meter in the power system. The voltage level in the low-voltage area generally does not exceed 1kV, which is suitable for power supply to residential houses, commercial buildings and small industrial facilities. The low-voltage area mainly includes distribution transformers, low-voltage lines, distribution boxes, protection devices and intelligent equipment.

[0003] As an important part of power supply, the safe and stable operation of low-voltage substations is directly related to the power safety of the majority of users and the economic benefits of power companies. Leakage faults in low-voltage substations mainly include leakage faults in low-voltage lines and insulation damage of equipment. Common causes of leakage in low-voltage lines include leakage at the crossing points between low-voltage lines and communication, postal and telecommunications, and cable TV lines, trees touching exposed wires, and users hooking electricity illegally. Similarly, insulation damage caused by aging, moisture or corrosion of electrical equipment such as switches and insulators, equipment quality problems or improper installation can also easily lead to leakage in low-voltage lines. Leakage faults in low-voltage substations may not only cause safety accidents such as fires and electric shocks, but may also cause power loss and affect the quality of power supply. Therefore, timely detection and positioning of leakage points and elimination of leakage faults as soon as possible have become important tasks for power supply departments.

[0004] The power supply radius of low-voltage substations is generally large, and due to the non-standard wiring of various networks such as power supply, communications, post and telecommunications, and cable TV, there are many cross-overs, and the number of branch switches, insulators and other equipment is large and widely distributed. This has resulted in a wide range of leakage detection work, a large workload, and it is difficult to carry out the work. The general method of leak detection is to shut down power level by level, climb poles and remove heads, and search house by house. By shutting down power line by line, the faulty low-voltage circuit is determined. Then, by climbing poles and removing heads on branch lines, the faulty branch lines are determined. By shutting down power on branch lines one by one and inspecting branch lines, the faulty users or low-voltage line fault points are determined. This method requires the cooperation of multiple people, multiple power outages, a large workload, and high safety risks. Summary of the invention

[0005] Based on this, the present invention provides a method, device, storage medium and equipment for low-voltage leakage detection and positioning. Through the cooperation of a low-voltage leakage detection and positioning system, the leakage detection and fault point positioning of the low-voltage area can be quickly realized without interrupting power supply, thereby improving the efficiency of leakage detection in the low-voltage area and reducing the impact of leakage detection on the normal power consumption of users.

[0006] In a first aspect, the present invention provides a method for detecting and locating leakage in a low-voltage area, the method for detecting and locating leakage in a low-voltage area is applied to a low-voltage leakage detection and locating system, the low-voltage leakage detection and locating system comprises a host, a first slave, a second slave, a coupling clamp and a processor, the host is connected to the coupling clamp, the first slave and the second slave are communicatively connected to the processor, and the method for detecting and locating leakage in a low-voltage area comprises the following steps:

[0007] The host outputs a characteristic current signal at a preset frequency, and inputs the signal into the leakage field circuit through the coupling clamp to form a characteristic current loop;

[0008] The first slave detects a characteristic current circulation at a detection point at a high position in the leakage field area, and determines a fault point according to the characteristic current circulation;

[0009] The second slave detects a characteristic current circulation at a detection point at a lower position in the leakage field area, and determines a fault point according to the characteristic current circulation;

[0010] The processor receives the fault point information sent by the first slave and the second slave, and records the specific fault point information of the low-voltage area leakage.

[0011] Furthermore, the low-voltage leakage detection and positioning system also includes a flexible clamp meter;

[0012] Before the host outputs the characteristic current signal at a preset frequency, the method for detecting and locating leakage in the low-voltage area further includes:

[0013] The flexible clamp meter detects the transformer junction box and the current signal at the branch in the low-voltage area to determine whether the low-voltage area has leakage;

[0014] If there is leakage in the low-voltage area, the host is set to output a characteristic current signal at a preset frequency.

[0015] Furthermore, the host outputs a characteristic current signal at a preset frequency, and inputs it into the leakage field area line through the coupling clamp to form a characteristic current loop, specifically:

[0016] The coupling clamp is clamped at the branch of the leakage field line or the grounding line of the transformer;

[0017] The host outputs a characteristic current signal at a preset frequency, and inputs the characteristic current signal into the leakage field area circuit through the coupling clamp;

[0018] The characteristic current passes through "transformer grounding wire-transformer-low-voltage substation line-leakage fault point-earth-transformer connection point" to form a characteristic current loop.

[0019] Furthermore, the first slave detects a characteristic current circulation at a detection point at a high position in the leakage field area, and determines the fault point according to the characteristic current circulation, specifically:

[0020] The first slave detects the branch zero line injection signals of each detection point at the high position of the leakage field area, and determines the fault branch according to the relative sizes of the branch zero line injection signals;

[0021] The first slave detects the magnitude of the injected signal of each detection point of the fault branch, and determines the detection point whose difference with the injected signals of the previous and next detection points exceeds a set threshold as the fault point.

[0022] Furthermore, the second slave detects a characteristic current circulation at a detection point at a lower position in the leakage field area, and determines a fault point according to the characteristic current circulation, specifically:

[0023] The second slave detects characteristic current circulation of each detection point at a lower detection point in the leakage field area;

[0024] If the indication signal of the second slave at the detection point exceeds a second threshold, the detection point is determined to be a fault point.

[0025] Furthermore, the host outputs a characteristic current signal at a preset frequency, specifically:

[0026] The host outputs a characteristic current signal in a continuous injection or interval injection manner at a preset frequency.

[0027] In a second aspect, the present invention further provides a low-voltage leakage detection and positioning device, the low-voltage leakage detection and positioning device is applied to a low-voltage leakage detection and positioning system, the low-voltage leakage detection and positioning system comprises a host, a first slave, a second slave, a coupling clamp and a processor, the host is connected to the coupling clamp, the first slave, the second slave are communicatively connected to the processor, and the low-voltage leakage detection and positioning device comprises the following modules:

[0028] A circulating current generating module, used for the host to output a characteristic current signal at a preset frequency, and input it into the leakage field area line through the coupling clamp to form a characteristic current circulation;

[0029] A high-altitude fault confirmation module is used for the first slave to detect the characteristic current circulation of the high-altitude detection point in the leakage field area, and determine the fault point according to the characteristic current circulation;

[0030] A low-point fault confirmation module, used for the second slave to detect the characteristic current circulation of the low-point detection point in the leakage field area, and determine the fault point according to the characteristic current circulation;

[0031] The fault integration module is used for the processor to receive the fault point information sent by the first slave and the second slave, and record the specific fault point information of the low-voltage area leakage.

[0032] Furthermore, the low-voltage leakage detection and positioning system also includes a flexible clamp meter;

[0033] The device for detecting and locating leakage in the low-voltage area further comprises:

[0034] A leakage judgment module, which is used for the flexible clamp meter to detect the transformer junction box and the current signal at the branch in the low-voltage area to judge whether the low-voltage area has leakage;

[0035] The leakage locating start module is used to set the host to output a characteristic current signal at a preset frequency if there is leakage in the low-voltage area.

[0036] In a third aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the steps of any one of the methods for low-voltage area leakage detection and positioning in the first aspect are implemented.

[0037] In a fourth aspect, the present invention further provides a computer device, comprising a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, it executes any one of the methods for low-voltage substation leakage detection and positioning in the first aspect.

[0038] The beneficial effects of adopting the above technical solution are as follows: this embodiment combines the low-voltage substation leakage detection and positioning system to accurately locate the leakage point of the low-voltage line without power outage, avoid the waste of time and labor costs caused by traditional power outages and pole climbing inspections, and improve the leakage detection and positioning efficiency of the low-voltage substation. Furthermore, by quickly detecting and locating the leakage fault point of the low-voltage substation, accurately locking the leakage fault point, and enabling the staff to quickly deal with the leakage fault point quickly, it can effectively reduce the loss of electricity in the substation, reduce the line loss rate of the low-voltage substation, and improve the operation efficiency and economy of the power grid. In addition, the detection and positioning of the leakage fault point in the low-voltage substation can assist the staff in eliminating safety hazards of leakage, reduce the occurrence of safety accidents such as fire and electric shock, and ensure the safety of electricity use; and the rapid determination of the leakage fault point can reduce the damage caused by the leakage current to the power equipment, extend the service life of the equipment, and reduce maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0040] Figure 1 A schematic diagram of a method for detecting and locating leakage in a low-voltage area in an embodiment of the present application;

[0041] Figure 2 This is a schematic diagram of the host structure in one embodiment of the present application;

[0042] Figure 3 This is a schematic diagram of the structure of the first slave in one embodiment of the present application;

[0043] Figure 4 This is a schematic diagram of the structure of the second slave in one embodiment of the present application;

[0044] Figure 5 This is a schematic diagram of the coupling clamp structure in one embodiment of the present application;

[0045] Figure 6 This is a schematic diagram of the structure of a flexible clamp meter in one embodiment of the present application;

[0046] Figure 7 This is a schematic diagram of a coupling clamp being connected to a branch of a leakage field line or a transformer grounding line in an embodiment of the present application;

[0047] Figure 8 This is a schematic diagram of the working mode of the first slave in one embodiment of the present application;

[0048] Fig. 9 This is a schematic diagram of the working mode of the second slave in one embodiment of the present application;

[0049] Fig.10 This is a schematic diagram of the working mode of a flexible clamp meter in one embodiment of the present application;

[0050] Fig.11 A schematic diagram of a device for detecting and locating leakage in a low-voltage area in one embodiment of the present application. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. In order to explain the present invention in more detail, the method, device, storage medium and equipment for low-voltage substation leakage detection and positioning provided by the present invention are specifically described below in conjunction with the drawings.

[0052] Unless otherwise defined, the technical terms or scientific terms used in the disclosure of this application should be understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one", "one" or "the" do not indicate a quantitative limit, but indicate that there is at least one. Similar words such as "include" or "include" mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Similar words such as "connect" or "connected" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship can also change accordingly.

[0053] Low-voltage area refers to the low-voltage distribution network area between the secondary side of the distribution transformer and the user's meter in the power system. The voltage level in the low-voltage area generally does not exceed 1kV, which is suitable for power supply to residential houses, commercial buildings and small industrial facilities. The low-voltage area mainly includes distribution transformers, low-voltage lines, distribution boxes, protection devices and intelligent equipment.

[0054] As an important part of power supply, the safe and stable operation of low-voltage substations is directly related to the power safety of the majority of users and the economic benefits of power companies. Leakage faults in low-voltage substations mainly include leakage faults in low-voltage lines and insulation damage of equipment. Common causes of leakage in low-voltage lines include leakage at the crossing points between low-voltage lines and communication, postal and telecommunications, and cable TV lines, trees touching exposed wires, and users hooking electricity illegally. Similarly, insulation damage caused by aging, moisture or corrosion of electrical equipment such as switches and insulators, equipment quality problems or improper installation can also easily lead to leakage in low-voltage lines. Leakage faults in low-voltage substations may not only cause safety accidents such as fires and electric shocks, but may also cause power loss and affect the quality of power supply. Therefore, timely detection and positioning of leakage points and elimination of leakage faults as soon as possible have become important tasks for power supply departments.

[0055] In this regard, the present invention provides a method for detecting and locating leakage in low-voltage areas. Through the cooperation of a low-voltage leakage detection and positioning system, the leakage detection and fault point location of the low-voltage area can be quickly realized without power outage, thereby improving the efficiency of leakage detection in the low-voltage area and reducing the impact of leakage detection on the normal power consumption of users. This method is applied to terminal equipment as an example for explanation. Figure 1 A schematic diagram of a method for detecting and locating leakage in a low-voltage area is shown.

[0056] The embodiment of the present application provides an application scenario of the method for detecting and locating leakage in a low-voltage area, and the application scenario includes the terminal device provided in the embodiment, and the terminal device includes but is not limited to a smart phone and a computer device, wherein the computer device can be at least one of a desktop computer, a portable computer, a laptop computer, a large computer, a tablet computer, etc. The user operates the terminal device to obtain the specific location of the leakage fault point in the low-voltage area. For the specific process, please refer to the embodiment of the method for detecting and locating leakage in a low-voltage area.

[0057] The method for low-voltage leakage detection and positioning in the embodiment of the present application needs to be combined with a low-voltage leakage detection and positioning system to be implemented. The low-voltage leakage detection and positioning system includes a host, a first slave, a second slave, a coupling clamp and a processor. The host is connected to the coupling clamp, and the first slave and the second slave are communicatively connected to the processor.

[0058] See attached Figure 2 The schematic diagram shows that the host is used to generate a special frequency signal for leakage detection and inject a special frequency signal into the low-voltage area line. It mainly includes a built-in signal generation module, a signal injection module, a human-computer interaction module, and a charging and power management module. Among them, the built-in signal generation module is used to generate a special frequency signal. It adopts the PWM pulse width modulation principle. The built-in microcontroller combines a timer or a counter to generate a fixed frequency signal. The comparator or logic circuit compares the signal with the set signal threshold to generate a PWM signal with a specific duty cycle. The signal injection module is used to amplify, filter and convert the PWM signal. The PWM signal is converted into a digital signal through the digital power amplifier chip in the signal injection module, and then the digital signal is processed and amplified. Finally, the processed digital signal is converted into a high-power analog current signal to drive the coupling clamp to inject a high-power signal into the low-voltage area line to be checked, so as to achieve precise amplification of the special frequency signal and control the output to the coupling clamp outlet. The human-computer interaction module includes external components such as a touch screen, a channel selection button, an operation indicator light, a buzzer, etc., which are used to realize functions such as signal injection channel selection, injection mode selection, injection start and stop, and status display.

[0059] As attached Figure 3As shown, the first slave can also be called a clamp meter, which is used to detect the special frequency signal injected by the host on the overhead line, including a measurement module, a human-computer interaction module, and a Bluetooth communication module. The measurement module mainly includes an open-type current measurement clamp head and a built-in sampling circuit, which detects the special frequency current signal of the host on the neutral line of the overhead line to be measured. The human-computer interaction module includes an automatic range switching circuit and a low-battery indicator light, which adapts to different current amplitudes through a built-in switching circuit and automatically adapts the amplification factor when the measured signal is small; the built-in microcontroller collects the power of the built-in battery in real time, and when the power is low enough to affect the precision and accuracy of the measurement results, the low-battery indicator warning light is turned on to remind the operator to replace the battery in time or charge the rechargeable battery. The Bluetooth communication module is used to establish a communication connection with the processor to realize data transmission.

[0060] As attached Figure 4 As shown, the second slave, also known as a handheld, detects the special frequency signal injected by the host at the low detection point (pole, tree, low cable) in the low-voltage area through the induction circuit, including a measurement module, a human-computer interaction module and a Bluetooth communication module. Among them, the measurement module mainly includes an induction coil current measurement head with a built-in sampling circuit to detect special frequency current signals at the poles, trees and low cables to be tested. The human-computer interaction module mainly includes a channel selection button, a mode switch, a signal strength indicator, a signal strength change indicator and a buzzer. The channel selection button can switch the test channel. There are four test channels to choose from. The mode switch includes the switch selections of "power on-calibration mode", "power on-test mode" and "power off". In the calibration mode, press and hold the selection button for 3 seconds. After the buzzer sounds, the signal calibration starts. When the channel LED indicators corresponding to F1-F4 stop flashing, it means the calibration is completed. In the test mode, short press to select the test channel. The signal strength indicator is the circular indicator part in the attached figure. When the signal strength indicator is green, it means the signal is strong, when the signal strength indicator is yellow, it means the signal is medium, and when the signal strength indicator is red, it means the signal is weak. The signal strength change indicator indicates the relative strength of the signal, which is shown by the bar indicator in the attached figure. When the bar light is lit to 50%, it means the current signal strength is 50% of the calibration signal. The Bluetooth communication module is used to establish a communication connection with the processor to realize data transmission.

[0061] As attached Figure 5As shown, the coupling clamp is mainly composed of a clamp-shaped coupling device and an induction coil. The coupling clamp is used in conjunction with the host. The coupling clamp is clamped at the leakage branch or the transformer grounding wire. The output special frequency current signal of the host is injected into the characteristic current signal through the coupling clamp. The fault current passes through the transformer grounding wire-transformer-line-fault point-earth-transformer grounding wire to form a fault current loop. The characteristic current before and after the fault point changes significantly, thereby realizing the leakage fault location function. The clamp-shaped coupling device is the main part of the coupling clamp, which is usually designed as a clamp-shaped structure so that it can be easily clamped on the cable or wire under test; the clamp-shaped coupling device contains an induction coil or other induction element inside to capture the magnetic field changes around the cable or wire. The induction coil is built into the coupling device and is the core component of the coupling clamp. It is usually wound by a wire and can sense the magnetic field generated by the current in the cable or wire; when the current passes through the cable, the induction coil will capture the change in the magnetic field and convert it into an electrical signal for output. In addition, the special frequency signal connector connects the host and the coupling clamp as one, and transmits the special frequency current signal output by the host to the coupling clamp and then outputs it to the distribution circuit to be tested.

[0062] Furthermore, the above-mentioned low-voltage leakage detection and positioning system also includes a flexible clamp meter, such as the attached Figure 6 As shown, it is used to determine whether there is leakage and the size of leakage current in the area to be tested by measuring leakage current before leakage detection. The flexible clamp meter mainly includes flexible sensor, Hall effect sensor, signal processing unit, display screen and control panel. The flexible sensor is the core component of the flexible clamp meter. It adopts advanced Rogowski Coil technology. The ring coil evenly wound on the non-ferromagnetic material is made into a high-precision flexible current sensor. This sensor has the characteristics of no hysteresis effect, almost zero phase error, no magnetic saturation phenomenon, extremely high linearity, and strong anti-interference ability; it can easily wrap around wires or cables, adapt to conductors of various diameters, and can even be bent into different shapes to work in a small space. The Hall effect sensor can detect the magnetic field strength generated around the wire and convert it into an electrical signal proportional to the current. The signal processing unit amplifies and processes the signal detected by the Hall effect sensor, and finally displays the accurate reading of the current. The display screen is used to display the detected current value. The control panel is provided with a power switch button and a hold button for turning the machine on and off and locking the measured value when the measured data is stable.

[0063] The processor includes a Bluetooth communication module, a display module and a data processing module, wherein the Bluetooth communication module is used to establish a communication link with the first slave machine and the second slave machine; the display module is used to display specific fault point location information; the data processing module is used to process and record the fault point information sent by the first slave machine and the second slave machine, and transmit the data to the display model for display.

[0064] Based on the above-mentioned low-voltage leakage detection and positioning system, the method for low-voltage leakage detection and positioning in this embodiment includes the following specific steps:

[0065] Step S101, the host outputs a characteristic current signal at a preset frequency, and inputs it to the leakage field area line through the coupling clamp to form a characteristic current loop.

[0066] Specifically, since the leakage detection of this embodiment needs to be carried out in a live environment, in order to distinguish the power frequency signal from the common interference harmonics, 1.5kHz-3.5kHz is selected as the preset frequency band, and four channels are set, for example, F1 is 1.8kHz, F2 is 2.3kHz, F3 is 2.8kHz, and F4 is 3.3kHz to set four characteristic current signals of different frequencies. The host outputs the characteristic current signal in a continuous injection or interval injection manner according to the preset frequency. According to the characteristics of the specific leakage detection site, the influence of specific interference loads can be avoided, and the preset frequency and specific output method can be selected to realize the output characteristic current signal, thereby improving the accuracy of the leakage fault point positioning. In some special cases, if an interference signal of the same frequency is encountered and the four preset frequencies are difficult to distinguish, the host can actively set the interval and continuous signal transmission mode to increase the accuracy of leakage identification and thus improve the positioning efficiency.

[0067] As attached Figure 7 As shown, the coupling clamp is connected to the branch of the leakage field area line or the transformer grounding line; the host outputs a characteristic current signal at a preset frequency, and inputs the characteristic current signal to the leakage field area line through the coupling clamp; the characteristic current passes through "transformer grounding line-transformer-low-voltage field area line-leakage fault point-earth-transformer connection point" to form a characteristic current loop.

[0068] Step S102: The first slave detects a characteristic current circulation at a detection point at a high position in the leakage field area, and determines a fault point according to the characteristic current circulation.

[0069] Specifically, as attached Figure 8 As shown, the above step S102 includes:

[0070] Step S201, the first slave detects the branch neutral line injection signals of each branch at the high detection point of the leakage field area, and determines the faulty branch according to the relative sizes of the branch neutral line injection signals;

[0071] Step S202: the first slave detects the magnitude of the injection signal of each detection point of the fault branch, and determines the detection point whose difference with the injection signal of the previous and next detection points exceeds a set threshold as the fault point.

[0072] In this embodiment, the high detection point in the leakage station area is the overhead line in the leakage station area, and the first slave machine is mainly used to detect whether there is a leakage fault at the high detection point in the leakage station area.

[0073] Step S103: the second slave detects a characteristic current circulation at a detection point at a lower position in the leakage field area, and determines a fault point according to the characteristic current circulation.

[0074] Specifically, as attached Fig. 9 As shown, step S103 includes:

[0075] Step S301, the second slave detects characteristic current circulation of each detection point at a lower detection point in the leakage field area;

[0076] Step S302: If the indication signal of the second slave at the detection point exceeds a second threshold, the detection point is determined to be a fault point.

[0077] In this embodiment, the low detection points in the leakage radio area are trees, poles and low cables in the leakage radio area, and the second slave device is mainly used to detect whether there is a leakage fault at the low detection points in the leakage radio area.

[0078] Step S104: the processor receives the fault point information sent by the first slave and the second slave, and records the specific fault point information of the low voltage area leakage.

[0079] In this embodiment, the processor can quickly and completely determine the overall leakage fault point information of the low-voltage substation by receiving the fault point information of the high detection point sent by the first slave and the fault point information of the low detection point sent by the second slave, and integrate and record the above fault point information.

[0080] In addition, the processor of this embodiment may also be provided with an image recording module, which takes pictures of the leakage fault point through the cooperation of the hardware camera and records it in combination with the specific information of the fault point (such as the specific coordinate position of the fault point).

[0081] In addition, as attached Fig.10 As shown, in order to improve the efficiency of leakage detection in the low voltage area, this embodiment is also provided with:

[0082] Step S401, the flexible clamp meter detects the transformer branch box and the current signal at the branch of the low-voltage transformer area to determine whether the low-voltage transformer area has leakage.

[0083] Step S402: If there is leakage in the low-voltage area, the host is set to output a characteristic current signal at a preset frequency.

[0084] Use a flexible clamp meter to detect whether there is leakage in the low-voltage area. Only after it is determined that there is leakage in the low-voltage area can the specific leakage fault point be detected and located, thereby improving the efficiency of leakage detection.

[0085] Furthermore, the current information of the low-voltage area can also be obtained during the flexible clamp meter detection process, and the frequency of the host characteristic current signal can be set according to the current information detected by the flexible clamp meter to improve the efficiency of characteristic current signal recognition and the accuracy of leakage fault point detection.

[0086] It should be understood that although the Figure 1 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Figure 1 At least part of the steps may include multiple sub-steps or sub-stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0087] The above embodiments of the present invention describe in detail the method for detecting and locating leakage current in low-voltage areas. The above methods disclosed in the present invention can be implemented using various types of equipment. Therefore, the present invention also discloses a device for detecting and locating leakage current in low-voltage areas. Fig.11 , specific embodiments are given below to explain in detail.

[0088] A circulating current generating module 501, which is used for the host to output a characteristic current signal at a preset frequency, and input it to the leakage field area line through the coupling clamp to form a characteristic current circulation;

[0089] A high-altitude fault confirmation module 502 is used for the first slave to detect a characteristic current circulation at a high-altitude detection point in the leakage field area, and determine a fault point according to the characteristic current circulation;

[0090] A low-point fault confirmation module 503 is used for the second slave to detect a characteristic current circulation at a low-point detection point in the leakage field area, and determine a fault point according to the characteristic current circulation;

[0091] The fault integration module 504 is used for the processor to receive the fault point information sent by the first slave and the second slave, and record the specific fault point information of the low-voltage area leakage.

[0092] Furthermore, the device for detecting and locating leakage in the low-voltage area further comprises:

[0093] The leakage judgment module 601 is used for the flexible clamp meter to detect the transformer junction box and the current signal at the branch in the low-voltage area to judge whether the low-voltage area has leakage;

[0094] The leakage locating start module 602 is used to set the host to output a characteristic current signal at a preset frequency if there is leakage in the low-voltage area.

[0095] For the device for low-voltage area leakage detection and positioning, please refer to the above definition of the method, which will not be repeated here. Each module in the above device can be implemented in whole or in part by software, hardware and a combination thereof. The above modules can be embedded in or independent of the processor of the terminal device in the form of hardware, or stored in the memory of the terminal device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0096] In one embodiment, the present invention further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of the method for low-voltage area leakage detection and positioning are implemented.

[0097] The computer-readable storage medium may be an electronic memory such as a flash memory, an EEPROM (electrically erasable programmable read-only memory), an EPROM (erasable programmable read-only memory), a hard disk or a ROM. Optionally, the computer-readable storage medium includes a non-transitory computer-readable storage medium. The computer-readable storage medium has a storage space for program codes for executing any method step of the above method. These program codes may be read from or written into one or more computer program products, and the program codes may be compressed in an appropriate form.

[0098] In one embodiment, the present invention provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the above-mentioned method for low-voltage area leakage detection and positioning when executing the computer program.

[0099] The computer device includes a memory, a processor and one or more computer programs, wherein the one or more computer programs can be stored in the memory and configured to be executed by one or more processors, and the one or more application programs are configured to execute the above-mentioned method for low-voltage area leakage detection and positioning.

[0100] The processor may include one or more processing cores. The processor uses various interfaces and lines to connect the various parts of the entire computer device, and executes various functions of the computer device and processes data by running or executing instructions, programs, code sets or instruction sets stored in the memory, and calling data stored in the memory. Optionally, the processor can be implemented in at least one hardware form of digital signal processing (Digital Signal Processing, DSP), field programmable gate array (Field-Programmable Gate Array, FPGA), and programmable logic array (Programmable Logic Array, PLA). The processor can integrate one or more combinations of a central processing unit (Central Processing Unit, CPU), a reporting verifier (Graphics Processing Unit, GPU) for buried data, and a modem. Among them, the CPU mainly processes the operating system, user interface, and application programs; the GPU is responsible for rendering and drawing display content; and the modem is used to process wireless communications. It can be understood that the above-mentioned modem may not be integrated into the processor, but may be implemented separately through a communication chip.

[0101] The memory may include a random access memory (RAM) or a read-only memory (ROM). The memory may be used to store instructions, programs, codes, code sets or instruction sets. The memory may include a program storage area and a data storage area, wherein the program storage area may store instructions for implementing an operating system, instructions for implementing at least one function (such as a touch function, a sound playback function, an image playback function, etc.), instructions for implementing the above-mentioned various method embodiments, etc. The data storage area may also store data created by the terminal device during use, etc.

[0102] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for detecting and locating leakage in a low-voltage area, wherein the method is applied to a low-voltage leakage detection and locating system, and is characterized in that: The low-voltage leakage detection and positioning system comprises a host, a first slave, a second slave, a coupling clamp and a processor, wherein the host is connected to the coupling clamp, the first slave, the second slave and the processor are communicatively connected, and the low-voltage leakage detection and positioning method comprises the following steps: The host outputs a characteristic current signal at a preset frequency, and inputs the signal into the leakage field circuit through the coupling clamp to form a characteristic current loop; The first slave detects a characteristic current circulation at a detection point at a high position in the leakage field area, and determines a fault point according to the characteristic current circulation; The second slave detects a characteristic current circulation at a detection point at a lower position in the leakage field area, and determines a fault point according to the characteristic current circulation; The processor receives the fault point information sent by the first slave and the second slave, and records the specific fault point information of the low-voltage area leakage.

2. The method for detecting and locating leakage in a low voltage area according to claim 1, characterized in that: The low-voltage leakage detection and positioning system also includes a flexible clamp meter; Before the host outputs the characteristic current signal at a preset frequency, the method for detecting and locating leakage in the low-voltage area further includes: The flexible clamp meter detects the transformer junction box and the current signal at the branch in the low-voltage area to determine whether the low-voltage area has leakage; If there is leakage in the low-voltage area, the host is set to output a characteristic current signal at a preset frequency.

3. The method for detecting and locating leakage in a low voltage area according to claim 2, characterized in that: The host outputs a characteristic current signal at a preset frequency, and inputs it into the leakage field line through the coupling clamp to form a characteristic current loop, specifically: The coupling clamp is clamped at the branch of the leakage field line or the grounding line of the transformer; The host outputs a characteristic current signal at a preset frequency, and inputs the characteristic current signal into the leakage field area circuit through the coupling clamp; The characteristic current passes through "transformer grounding wire-transformer-low-voltage substation line-leakage fault point-earth-transformer connection point" to form a characteristic current loop.

4. The method for detecting and locating leakage in a low voltage area according to claim 3, characterized in that: The first slave detects a characteristic current circulation at a detection point at a high position in the leakage field area, and determines a fault point according to the characteristic current circulation, specifically: The first slave detects the branch zero line injection signals of each detection point at the high position of the leakage field area, and determines the fault branch according to the relative sizes of the branch zero line injection signals; The first slave detects the magnitude of the injected signal of each detection point of the fault branch, and determines the detection point whose difference with the injected signals of the previous and next detection points exceeds a set threshold as the fault point.

5. The method for detecting and locating leakage in a low voltage area according to claim 4, characterized in that: The second slave detects the characteristic current circulation of the detection point at the lower part of the leakage field area, and determines the fault point according to the characteristic current circulation, specifically: The second slave detects characteristic current circulation of each detection point at a lower detection point in the leakage field area; If the indication signal of the second slave at the detection point exceeds a second threshold, the detection point is determined to be a fault point.

6. The method for detecting and locating leakage in a low voltage area according to claim 5, characterized in that: The host outputs a characteristic current signal at a preset frequency, specifically: The host outputs a characteristic current signal in a continuous injection or interval injection manner at a preset frequency.

7. A device for detecting and locating leakage in a low-voltage area, the device for detecting and locating leakage in a low-voltage area being applied to a low-voltage leakage detection and locating system, characterized in that: The low-voltage leakage detection and positioning system includes a host, a first slave, a second slave, a coupling clamp and a processor, the host is connected to the coupling clamp, the first slave, the second slave and the processor are communicatively connected, and the low-voltage leakage detection and positioning device includes the following modules: A circulating current generating module, used for the host to output a characteristic current signal at a preset frequency, and input it into the leakage field area line through the coupling clamp to form a characteristic current circulation; A high-altitude fault confirmation module is used for the first slave to detect the characteristic current circulation of the high-altitude detection point in the leakage field area, and determine the fault point according to the characteristic current circulation; A low-point fault confirmation module, used for the second slave to detect the characteristic current circulation of the low-point detection point in the leakage field area, and determine the fault point according to the characteristic current circulation; The fault integration module is used for the processor to receive the fault point information sent by the first slave and the second slave, and record the specific fault point information of the low-voltage area leakage.

8. The device for detecting and locating leakage in a low-voltage area according to claim 7, characterized in that: The low-voltage leakage detection and positioning system also includes a flexible clamp meter; The device for detecting and locating leakage in the low-voltage area further comprises: A leakage judgment module, which is used for the flexible clamp meter to detect the transformer junction box and the current signal at the branch in the low-voltage area to judge whether the low-voltage area has leakage; The leakage locating start module is used to set the host to output a characteristic current signal at a preset frequency if there is leakage in the low-voltage area.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for low-voltage area leakage detection and positioning according to any one of claims 1 to 6 are implemented.

10. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, it performs the method for low-voltage area leakage detection and positioning according to any one of claims 1-6.

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