Intelligent electric meter

Abstract

The invention relates to the technical field of intelligent electric meters, in particular to an intelligent electric meter, which comprises the following modules: an acquisition module used for inputting a circuit wiring diagram; the switch is used for controlling on-off of the circuit; the self-checking module is used for applying detection voltage when the circuit is disconnected and measuring the current in the circuit; the processing module is used for processing circuit wiring diagram information, judging whether short circuit exists in the circuit and determining the short circuit position; the storage module is used for storing circuit information; the display module is used for displaying whether short circuit exists in the circuit and determining the short circuit position; and the communication module is used for information transmission among the acquisition module, the storage module, the self-checking module, the interaction module and the switch. According to the invention, the self-checking module is integrated through the intelligent electric meter, the detection voltage is applied, the current is measured, the circuit wiring diagram information is combined, whether the short circuit exists or not is automatically judged, the position where the short circuit possibly exists is accurately positioned, the whole circuit does not need to be detected, manual troubleshooting and workload are greatly reduced, and the detection efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of smart electric meters, and in particular to a smart electric meter. Background Art

[0002] The main function of traditional electric meters is to record the total power consumption. It cannot obtain more power consumption information and has a relatively single function. In modern power systems and electronic equipment, circuit short circuits are a common fault phenomenon that may cause equipment damage, fire, and even personal injury. Therefore, timely and accurate detection and location of short circuits is crucial to ensure the safety and reliability of the system.

[0003] During the use of circuit wires, various situations may occur, such as aging and damage of the insulating rubber, moisture, impact of foreign objects, etc., which may cause a short circuit in the circuit. When the problem circuit is reconnected to the power supply, a short circuit is likely to occur, causing the circuit to fail to work. Traditional short-circuit detection methods usually rely on manual operation and experience judgment, and generally adopt a step-by-step troubleshooting method. If a short circuit is found, the circuit can be gradually disassembled and tested section by section until the approximate short circuit location is found. This method is inefficient and prone to errors.

[0004] Publication number: CN113092939B A distribution network fault location method based on PMU and smart meter, including the following steps: S1: construct bus impedance matrix Zbus; S2: read the voltage offset measured by the smart meter, the formula is as follows: where i represents the feeder meter installed on bus i, represents the voltage value measured by the feeder meter before the fault, represents the voltage value measured by the feeder meter during the fault; S3: estimate the fault current of each bus in the distribution system through the measurement value of the smart meter, the bus impedance matrix, and the voltage offset. The fault location method in this invention is obtained by analyzing the abnormal voltage at each node based on a large number of smart meters, and it is impossible to determine the short circuit and short circuit location of the complex circuit under the meter.

[0005] Therefore, there is an urgent need for a new smart meter that can quickly detect whether a circuit is short-circuited and determine the short-circuit location. Summary of the invention

[0006] In view of this, the present invention aims to provide a smart electric meter to solve the problem of quickly detecting whether a short circuit exists in a circuit and being unable to determine the location where the short circuit occurs.

[0007] The technical solution of the present invention is achieved in this way:

[0008] The present invention discloses a smart electric meter, comprising the following modules:

[0009] The acquisition module is used to input the circuit wiring diagram;

[0010] The switch is used to control the on and off of the circuit;

[0011] The self-test module is used to apply a test voltage when the circuit is disconnected and measure the current in the circuit;

[0012] The processing module is used to process the circuit wiring diagram information, determine whether there is a short circuit in the circuit and determine the short circuit location;

[0013] The storage module is used to store circuit information;

[0014] The display module is used to display whether there is a short circuit in the circuit and determine the short circuit position;

[0015] The communication module is used for information transmission between the acquisition module, storage module, self-test module, interaction module and switch.

[0016] Furthermore, the input module is one or more of an image scanning device, a user interface and an input device or a data input interface, which is used to scan paper drawings, upload electronic files or directly draw circuit wiring diagrams on the device.

[0017] Furthermore, the switch is a relay or a contactor, which is used for the user to control the on and off of the circuit.

[0018] Furthermore, the self-check module includes

[0019] The detection power supply is used to provide a safe detection voltage U;

[0020] The current detection module is used to measure the current I in the circuit 检 ;

[0021] The relay is used to control the on / off between the detection power supply and the circuit;

[0022] Protection resistor R 阻 Used to limit the detection current to avoid excessive current causing circuit damage.

[0023] Further, the self-check module working steps:

[0024] S1: When the circuit is broken, the relay is connected to the circuit and the detection power supply works;

[0025] S2: Detect the power supply working time T, the current detection module detects the current I in the circuit 检 size;

[0026] S3: After the power supply is detected to work for T time, the relay is disconnected;

[0027] S4: The current detection module transmits the detected current information to the processing module.

[0028] Further, the method for determining whether the circuit is short-circuited is as follows: first, the processing module receives the current information transmitted by the current detection module, and converts I检 and 0, when I 检 >0, there is a short circuit in the circuit wire. 检 When =0, there is no short circuit in the circuit wires.

[0029] Furthermore, there are multiple loops in the circuit wiring diagram, and the length of the wire of the i-th loop is L i =L i1 +L i2 +…+L in ;

[0030] Where: L in is the i-th circuit, which has n wires;

[0031] i and n are natural numbers;

[0032] The total resistance of the i-th circuit is R i =R i1 +R i2 +…+R in ;

[0033]

[0034] Where: R in is the resistance of the nth wire section in the ith circuit;

[0035] ρ in is the resistivity of the nth section of wire in the ith circuit;

[0036] A in is the cross-sectional area of ​​the nth wire section in the ith circuit.

[0037] Further, the method for determining the short circuit position in the circuit is as follows:

[0038] S1: The processing module receives the current I detected by the self-test module 检 , calculate the detection resistance

[0039] S2: The processing module retrieves the circuit wiring diagram, the wire between two adjacent nodes is a section, obtains the resistivity ρ and the cross-sectional area A of each wire section, and numbers each wire section;

[0040] S3: The processing module uses the cable length calculator plug-in or CAD software to calculate any i-th loop in the circuit wiring diagram. The i-th loop has n wires. The length of the wire in the i-th loop is L in , calculate the total resistance R of the i-th circuit i ;

[0041] S4: If R i >0.5R, the circuit may be short-circuited. i<0.5R, then there is no short circuit in the circuit;

[0042] S5: gradually accumulate the resistance of each wire section in the i-th loop, compare it with 0.5R, and determine the wire number of the short-circuited wire in each loop, the distance L between the short-circuited position and the electric meter, and the distance s between the short-circuited point and the adjacent node;

[0043] S6: After all circuits are confirmed, if there is a short circuit, the processing module transmits the distance L of the short circuit position from the electric meter, the distance s from the short circuit point to the adjacent node and the short circuit wire number to the display device for the user to check and repair. If there is no short circuit, feedback is given that there is no short circuit.

[0044] Furthermore, in step S5, the method for determining the short-circuit position of the wire is:

[0045] S51: gradually add up the resistance of each section of the wire in the i-th loop to obtain the total resistance R' of the wires from the 1st section to the mth section of the i-th loop im =R i1 +R i2 +…+R im ;

[0046] S52: If R'<0.5R≤R', then the mth section of the wire is the position where the short circuit i(m-1)im occurs in the loop, and the corresponding wire number is obtained;

[0047] S53: Calculate the distance between the short circuit position and the electric meter The distance between the short-circuit point and the adjacent node

[0048]

[0049] Furthermore, it also includes a remote communication module, which is used for users to remotely control the smart meter through a wireless network or a wired network.

[0050] Compared with the prior art, the smart meter of the present invention has the following advantages:

[0051] 1. The present invention integrates a self-test module into the smart meter. After the switch is disconnected, a test voltage is applied and the current is measured. Combined with the circuit wiring diagram information, it is automatically determined whether a short circuit exists and the possible location of the short circuit is accurately located. There is no need to test the entire circuit, which greatly reduces manual troubleshooting and workload and improves the accuracy and efficiency of detection.

[0052] 2. The present invention sets a special short-circuit detection function. Before the smart meter is connected to the circuit, the self-test module is used to detect the circuit to confirm whether there is a short circuit in the wire, thereby avoiding the risk of fire and other electrical accidents caused by directly connecting the short-circuited circuit to electricity.

[0053] 3. The present invention can remotely operate the smart meter to perform self-inspection of the circuit through the remote control function, without the need for on-site operation, which significantly improves safety and convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0055] Figure 1 This is a schematic diagram of the structure of a smart meter;

[0056] Figure 2 This is the working flow diagram of the self-test module in the smart meter;

[0057] Figure 3 A diagram showing the steps for determining short circuit and short circuit location in a smart meter. DETAILED DESCRIPTION

[0058] In order to make the technical means, objectives and effects of the present invention easy to understand, the embodiments of the present invention are described in detail below with reference to specific drawings.

[0059] It should be noted that all the terms used in the present invention to indicate directionality and position, such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "inside", "outside", "top", "lower", "lateral", "longitudinal", "center", etc., are only used to explain the relative positional relationship and connection status between the components in a certain state, and are only for the convenience of describing the present invention, rather than requiring the present invention to be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features.

[0060] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0062] The present invention discloses a smart electric meter, comprising a collection module, a storage module, a self-checking module, an interaction module and a switch;

[0063] The acquisition module is used to input the circuit wiring diagram;

[0064] The switch is used to control the on and off of the circuit;

[0065] The self-test module is used to apply a test voltage when the circuit is disconnected and measure the current in the circuit;

[0066] The processing module is used to process the circuit wiring diagram information, determine whether there is a short circuit in the circuit and determine the short circuit location;

[0067] The storage module is used to store circuit information;

[0068] The display module is used to display whether there is a short circuit in the circuit and determine the short circuit position;

[0069] The communication module is used for information transmission between the acquisition module, storage module, self-test module, interaction module and switch.

[0070] An acquisition module is set up to input the circuit wiring diagram of a home or industrial building, which can be achieved by scanning paper drawings, uploading electronic files or drawing directly on the device; the switch setting can allow the user to manually control the opening and closing of the circuit, increasing the flexibility and safety of use; when the circuit is disconnected, the self-test module gives the circuit time to detect the voltage, and uses the detection capability of the electric meter to measure the current in the circuit; the processing module obtains circuit information through the circuit wiring diagram input by the acquisition module, uses the cable length calculator plug-in or CAD software to calculate, receives the current measured by the self-test module, and has the ability to determine whether there is a short circuit in the circuit through logic, and can locate the specific short circuit position, so as to quickly respond to faults and reduce maintenance time and cost; the storage module is used to save the circuit wiring diagram and other related data, such as wire specifications, installation date, etc., for subsequent query and maintenance; the display module can facilitate users to intuitively view the self-test result information.

[0071] This design expands the functions of traditional electricity meters and adds intelligent features, especially the management of circuit wiring diagrams and automated fault diagnosis capabilities, which help to identify safety hazards early, quickly locate fault points, speed up maintenance, save time and costs, avoid situations that may cause serious consequences such as fires, improve the safety and reliability of the power system, and prevent accidents by promptly discovering and addressing potential problems.

[0072] Specifically, the entry module can be an image scanning device, a user interface and input device, or a data input interface, and the circuit wiring diagram can be entered into the device by scanning paper drawings, uploading electronic files, or drawing directly on the device.

[0073] The image scanning device can be a high-resolution camera or a professional scanner, which can be used to scan paper drawings and convert them into electronic format to facilitate subsequent operations; the user interface and input device can be a touch screen, keyboard and mouse, allowing users to directly draw or edit circuit diagrams; the data input interface can be a USB interface, a network interface (Wi-Fi / Ethernet), Bluetooth / NFC, which is used to upload electronic files or import circuit diagrams from external devices.

[0074] This setting uses an image scanning device, a user interface and input device, and a data input interface to enable the entry module to provide a variety of flexible circuit wiring diagram entry methods, which not only improves the efficiency and accuracy of data entry, but also enhances the user experience and the overall functionality of the system, making the smart meter more practical and efficient and suitable for a variety of different application scenarios.

[0075] Specifically, the switch may be a relay or a contactor, which is used for the user to control the on and off of the circuit.

[0076] The relay has a simple structure, stable operation, and long life. It can provide good electrical isolation and protect the control circuit from interference from the load circuit. The relay has a short response time and is suitable for applications that require fast switching. The cost is relatively low and it is suitable for large-scale applications. At the same time, the relay is small in size and easy to integrate into various devices.

[0077] Contactors are capable of handling larger currents and are suitable for high-power applications in industrial and power systems. Their built-in overload protection function can effectively prevent circuit overload and improve system safety. They are suitable for frequent operations and have a long mechanical and electrical life. They also support a variety of control methods such as manual, automatic and remote control, are highly flexible, and have the advantages of a relatively simple structure and easy maintenance and replacement.

[0078] This setup uses relays or contactors as switching modules, which can achieve efficient, reliable and safe control of the circuit. According to the specific application requirements, appropriate switching devices can be selected to achieve the best control effect and system performance.

[0079] Specifically, the self-test module includes

[0080] The detection power supply is used to provide a safe detection voltage U;

[0081] The current detection module is used to measure the current I in the circuit 检 ;

[0082] The relay is used to control the on / off between the detection power supply and the circuit;

[0083] Protection resistor R 阻 Used to limit the detection current to avoid circuit damage caused by excessive current.

[0084] The self-test module provides voltage by detecting the power supply, the current detection module measures the current, the relay controls the circuit on and off, and the protection resistor provides current limiting protection, thereby completing the circuit status detection together.

[0085] When the circuit is disconnected, the detection power supply provides a safe detection voltage for the circuit to measure the current in the circuit. The detection power supply is usually a low voltage source to ensure that the circuit will not be damaged or dangerous during the detection process. The current detection module measures the current in the circuit through sensors such as Hall effect sensors, shunt resistors, etc., converts the detected current signal into an electrical signal, and performs amplification, filtering and other processing for subsequent analysis. The relay is used to control the connection between the detection power supply and the circuit to ensure the safe disconnection and reconnection of the circuit during the detection process. The relay provides electrical isolation to protect the detection power supply and control circuit from the influence of the load circuit. Protection resistor R 阻 It is used to limit the detection current to prevent the circuit from being damaged due to excessive current during the detection process. It can also protect the detection power supply from overload or short circuit.

[0086] The detection power supply, relay and protection resistor of this setting jointly provide multi-level safety protection. Each component has a simple structure and stable operation, which improves the overall reliability of the system. The cost of protection resistors and relays is low, and the entire self-test module has good cost-effectiveness.

[0087] Specifically, the working steps of the self-test module are:

[0088] S1: When the circuit is broken, the relay is connected to the circuit and the detection power supply works;

[0089] S2: Detect the power supply working time T, the current detection module detects the current I in the circuit 检 size;

[0090] S3: After the power supply is detected to work for T time, the relay is disconnected;

[0091] S4: The current detection module transmits the detected current information to the processing module.

[0092] After the circuit is disconnected, the self-test module receives the signal from the processing module, and the relay closes and connects to the circuit. The detection power supply continues to work within the set time T. The current detection module can accurately measure the current in the circuit and provide data support for subsequent analysis to avoid the detection power supply working time too long when a short circuit occurs in the circuit, causing a dangerous situation.

[0093] Specifically, the method for determining whether the circuit is short-circuited is as follows: receiving the current information transmitted by the current detection module, and converting I 检 and 0, when I 检 >0, there is a short circuit in the circuit wire. 检 When =0, there is no short circuit in the circuit wires.

[0094] Through simple current comparison, it is possible to quickly determine whether there is a short circuit in the circuit, thereby improving the speed of fault diagnosis. This method can be fully automated without the need for human intervention, reducing the possibility of human error. A circuit self-check is performed before the circuit is connected, which can promptly detect short circuit problems and avoid fires or other electrical accidents caused by short circuits, thereby improving the safety of the system. Once a short circuit is detected, the user or maintenance personnel can be notified immediately, facilitating timely measures for maintenance.

[0095] Specifically, the method for determining the short circuit position in the circuit is as follows:

[0096] S1: The processing module receives the current I detected by the self-test module 检 , calculate the detection resistance

[0097] S2: The processing module retrieves the circuit wiring diagram, the wire between any two nodes is a section, obtains the resistivity ρ and the cross-sectional area A of each wire section, and numbers each wire section;

[0098] S3: The processing module uses the cable length calculator plug-in or CAD software to calculate any i-th loop in the circuit wiring diagram. The i-th loop has n wires. The length of the wire in the i-th loop is L i =L i1 +L i2 +…+L in , i and n are natural numbers, and the resistance R of the i-th loop is calculated i =R i1 +R i2 +…+R in ;

[0099] S4: If R i >0.5R, the circuit may be short-circuited. i <0.5R, then there is no short circuit in the circuit;

[0100] S5: resistance of the i-th loop, resistance of the wire in the 1-mth section R' im =R i1 +R i2 +…+R im , if R'<0.5R≤R', the short circuit position is at a distance of i(m-1)im from the meter

[0101] The distance between the short-circuit point and the adjacent node Determine the number of the short-circuited wire in each loop, the distance L between the short-circuit location and the electric meter, and the distance s between the short-circuit point and the adjacent node;

[0102] S6: After all circuits are confirmed, if there is a short circuit, the processing module transmits the distance L of the short circuit position from the electric meter, the distance s from the short circuit point to the adjacent node and the short circuit wire number to the display device for the user to check and repair. If there is no short circuit, feedback is given that there is no short circuit.

[0103] By gradually accumulating the resistance of each section of wire and calculating and comparing it with the detection resistance R, the specific location of the short circuit can be accurately located, improving the accuracy of fault diagnosis. Utilizing automated detection and calculation, the short circuit can be quickly determined and located, providing detailed short circuit location information, making it easier for maintenance personnel to quickly find the fault point, improve maintenance efficiency, reduce downtime and maintenance time, facilitate timely discovery and handling of short circuit problems, avoid fires or other electrical accidents caused by short circuits, and improve system safety.

[0104] Through the above method, the smart meter can efficiently and accurately detect and locate the short circuit position in the circuit, which not only improves the safety and reliability of the system, but also enhances the efficiency of fault diagnosis and maintenance. By combining the circuit wiring diagram and resistance calculation, the smart meter provides users with a comprehensive and practical solution suitable for a variety of application scenarios such as home, industrial and commercial power systems.

[0105] Specifically, after the processing module calculates the distance L between the short-circuit location and the electric meter, the distance s between the short-circuit point and the adjacent node, and the number of the short-circuited wire, the location where the short circuit may exist is intuitively displayed on the circuit wiring diagram, and the information is transmitted to the display device, so that the user or maintenance personnel can intuitively see the circuit wiring diagram showing the possible short-circuit location.

[0106] This setting enables users or maintenance personnel to clearly know the location where a short circuit may exist, greatly reducing the workload of circuit troubleshooting, helping to improve maintenance efficiency and reduce the risk of fire caused by circuit short circuits.

[0107] Specifically, when the wire materials are the same but the cross-sectional areas are different, the method for determining the short circuit position is: the i-th loop has n sections of circuits, and the comparison and The size of Less than Then there is no short circuit in the i-th circuit, if Greater than Then the i-th loop may have a short circuit. Less than and Greater than When , there may be a short circuit in the mth section of the i-th loop.

[0108] When the wire materials are the same and the cross-sectional areas are different, the resistance of each wire increases with the cross-sectional area A. im and length L im This further reduces the amount of calculation in the judgment method and helps to reduce the difficulty of calculation.

[0109] In normal use, the material of the wire is generally consistent from the meter to the far end, and the cross-sectional area decreases as the distance from the meter increases. That is, the farther away from the meter in the actual circuit, the greater the resistance of the wire at the same length.

[0110] Specifically, when the wire material and cross-sectional area are the same, the distance between the short circuit position and the meter is

[0111]

[0112] Where: U is the detection power supply voltage;

[0113] A is the cross-sectional area of ​​the wire in the circuit;

[0114] ρ is the resistivity of the wire;

[0115] I 检 The current detected by the self-test module;

[0116] R 阻 To protect the resistor.

[0117] When the wire material and cross-sectional area are the same, the above calculation method can greatly reduce the amount of calculation, avoid calculating the resistance of each section of wire, and directly and accurately determine the distance L between the short-circuit position and the electric meter.

[0118] Specifically, when the wire materials and cross-sectional areas in the circuit wiring diagram are the same, the method for determining the short circuit position in the circuit is:

[0119] S1: The processing module receives the current I detected by the self-test module 检 , calculate the distance L between the short-circuit position and the electric meter;

[0120] S2: The processing module retrieves the circuit wiring diagram, obtains the wire resistivity and wire cross-sectional area, and numbers each wire segment; the wire between any two nodes is a segment;

[0121] S3: The processing module calculates the length L of any loop in the circuit wiring diagram using the cable length calculator plug-in or CAD software i =L i1 +L i2 +...+L in ;

[0122] S4: If L i >2L, the circuit may be short-circuited. i <2L, then there is no short circuit in the circuit;

[0123] S5: According to the distance L between the short-circuit position and the electric meter, determine the number of the short-circuited wire in each loop and the distance s between the short-circuit point and the adjacent node;

[0124] S6: The processing module transmits the distance L between the short-circuit position and the electric meter, the distance s between the short-circuit point and the adjacent node, and the number of the short-circuited wire to the display device for the user to view and repair.

[0125] By calculating the circuit loop length and the detected current, the specific location of the short circuit can be accurately determined, improving the accuracy of fault diagnosis. By using automated detection and calculation, the short circuit can be quickly determined and located, providing detailed short circuit location information, making it easier for maintenance personnel to quickly find the fault point, improve maintenance efficiency, reduce downtime and maintenance time, promptly detect and handle short circuit problems, avoid fires or other electrical accidents caused by short circuits, and improve system safety.

[0126] Through the above method, the smart meter can efficiently and accurately detect and locate the short circuit position in the circuit, which not only improves the safety and reliability of the system, but also enhances the efficiency of fault diagnosis and maintenance. Combined with the circuit wiring diagram and resistance calculation, the smart meter provides users with a comprehensive and practical solution suitable for a variety of application scenarios such as home, industrial and commercial power systems.

[0127] Specifically, in step S5, the specific determination steps are as follows:

[0128] S51: Length of wire from the meter to the first branch point L i1 ;

[0129] S52: Compare the distance L between the short-circuit position and the electric meter with the length L of the wire i1 The size of L≤L i1 When the electric wire from the meter to the first branch point is short-circuited;

[0130] S53: If L>L i1 , compare the distance L between the short circuit position and the meter and (L i1 +L i2 ) size, if L≤(L i1 +L i2 ), then the L i2 A short circuit occurs in the branch line wire;

[0131] S54: If L>(L i1 +L i2 ), compare the short-circuit position distance L to the meter and (L i1 +L i2 +L i3 ) size, if L≤(L i1 +L i2 +L i3 ), then the L i3 A short circuit occurs in the branch line wire;

[0132] S55: If L>(L i1 +L i2 +L i3 ), repeat the above steps until L≤(L i1 +L i2 +...+L in ), then the L in A short circuit occurred in the branch line.

[0133] By gradually comparing the distance L between the short-circuit location and the electric meter with the length of each section of the wire, the specific location of the short circuit can be accurately determined, the accuracy of fault diagnosis can be improved, the amount of calculation of the judgment logic can be effectively reduced, and the judgment speed can be improved.

[0134] Specifically, the distance between the short-circuit point and the adjacent node is s=L-(L i1 +L i2 …+L i(m-1) );

[0135] Through the above steps, it is determined that the short circuit occurs in the mth section of the circuit, and the distance L between the short circuit location and the electric meter is known. Now, the distance L from the short circuit location to the electric meter is subtracted from the length from the end of the m-1th section of the wire to the electric meter to obtain the distance s from the short circuit point to the adjacent node.

[0136] By calculating the distance s between the short-circuit point and the adjacent nodes, maintenance personnel can directly locate the vicinity of the short-circuit point based on the s value, reducing misjudgment caused by human judgment errors, ensuring the accuracy of maintenance work, and avoiding one-by-one inspection of the entire circuit segment. The specific location of the short circuit can be determined more accurately, reducing the time for maintenance personnel to find the fault point and improving maintenance efficiency. At the same time, detailed short-circuit location information, including the distance between the short-circuit point and the adjacent nodes, can be recorded to facilitate subsequent management and maintenance work.

[0137] By calculating the distance s between the short-circuit point and the adjacent nodes, the smart meter can provide more accurate short-circuit location information, helping maintenance personnel to quickly locate the fault point and improve maintenance efficiency and accuracy.

[0138] Specifically, it also includes a remote communication module, which is used for users to remotely control the smart meter through a wireless network or a wired network.

[0139] Users can remotely control the on and off of the circuit, for example, by controlling the on and off status of the switch through a mobile phone application or a web interface. Not only can they quickly cut off the power supply in an emergency to avoid further electrical accidents, but they can also remotely control the self-check module in the smart meter to check whether there is a short circuit in the circuit before disconnecting and reconnecting the circuit, so as to avoid accidents caused by short circuits when the circuit is used. If there is a short circuit, users can remotely obtain the possible wire segments at the short circuit location, greatly reducing the difficulty of troubleshooting. It is also possible to remotely view the status of the circuit through the Internet or local area network, including parameters such as current, voltage, and power.

[0140] By setting up the remote communication module, the smart meter can not only realize remote monitoring and control, but also provide functions such as real-time alarm, data transmission and historical record. These functions greatly improve the safety, convenience and response speed of the system, and also provide users with a more flexible and efficient power management system.

[0141] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A smart electric meter, characterized in that: Includes the following modules: The acquisition module is used to input the circuit wiring diagram; The switch is used to control the on and off of the circuit; The self-test module is used to apply a test voltage when the circuit is disconnected and measure the current in the circuit; The processing module is used to process the circuit wiring diagram information, determine whether there is a short circuit in the circuit and determine the short circuit location; The storage module is used to store circuit information; The display module is used to display whether there is a short circuit in the circuit and determine the short circuit position; The communication module is used for information transmission between the acquisition module, storage module, self-test module, interaction module and switch.

2. The smart electric meter according to claim 1, characterized in that: The input module is one or more of an image scanning device, a user interface and an input device or a data input interface, which is used to scan paper drawings, upload electronic files or directly draw circuit wiring diagrams on the device.

3. The smart electric meter according to claim 1, characterized in that: The switch is a relay or a contactor, which is used to control the on and off of the circuit.

4. The smart electric meter according to claim 1, characterized in that: The self-test module includes a test power supply for providing a safe test voltage U; The current detection module is used to measure the current I in the circuit 检 ; The relay is used to control the on / off between the detection power supply and the circuit; Protection resistor R 阻 Used to limit the detection current to avoid excessive current causing circuit damage.

5. The smart electric meter according to claim 3, characterized in that: Self-check module working steps: S1: When the circuit is broken, the relay is connected to the circuit and the detection power supply works; S2: Detect the power supply working time T, the current detection module detects the current I in the circuit 检 size; S3: After the power supply is detected to work for T time, the relay is disconnected; S4: The current detection module transmits the detected current information to the processing module.

6. The smart electric meter according to claim 1, characterized in that: Method for judging whether the circuit is short-circuited: First, the processing module receives the current information transmitted by the current detection module and converts I 检 and 0, when I 检 >0, there is a short circuit in the circuit wire. 检 When =0, there is no short circuit in the circuit wires.

7. The smart electric meter according to claim 6, characterized in that: In the circuit wiring diagram, the length of the wire in the i-th loop is L i =L i1 +L i2 +…+L in ; Where: L in is the i-th circuit, which has n wires; i and n are natural numbers; The total resistance of the i-th circuit is R i =R i1 +R i2 +…+R in ; Where: R in is the resistance of the nth wire section in the ith circuit; ρ in is the resistivity of the nth section of wire in the ith circuit; A in is the cross-sectional area of ​​the nth wire section in the ith circuit.

8. The smart electric meter according to claim 7, characterized in that: Method for determining the short circuit position in the circuit: S1: The processing module receives the current I detected by the self-test module 检 , calculate the detection resistance S2: The processing module retrieves the circuit wiring diagram, the wire between two adjacent nodes is a section, obtains the resistivity ρ and the cross-sectional area A of each wire section, and numbers each wire section; S3: The processing module uses the cable length calculator plug-in or CAD software to calculate any i-th loop in the circuit wiring diagram. The i-th loop has n wires. The length of the wire in the i-th loop is L in , calculate the total resistance R of the i-th circuit i ; S4: If R i >0.5R, the circuit may be short-circuited. i <0.5R, then there is no short circuit in the circuit; S5: gradually accumulate the resistance of each wire section in the i-th loop, compare it with 0.5R, and determine the wire number of the short-circuited wire in each loop, the distance L between the short-circuited position and the electric meter, and the distance s between the short-circuited point and the adjacent node; S6: After all circuits are confirmed, if there is a short circuit, the processing module transmits the distance L of the short circuit position from the electric meter, the distance s from the short circuit point to the adjacent node and the short circuit wire number to the display device for the user to check and repair. If there is no short circuit, feedback is given that there is no short circuit.

9. The smart electric meter according to claim 8, characterized in that: In step S5, the method for determining the short-circuit position of the wire is as follows: S51: gradually add up the resistance of each section of the wire in the i-th loop to obtain the total resistance R' of the wires from the 1st section to the mth section of the i-th loop im =R i1 +R i2 +…+R im ; S52: If R'<0.5R≤R', then the mth section of the wire is the position where the short circuit i(m-1)im occurs in the loop, and the corresponding wire number is obtained; S53: Calculate the distance between the short circuit position and the electric meter The distance between the short-circuit point and the adjacent node 10. The smart electric meter according to claim 1, characterized in that: It also includes a remote communication module, which is used for users to remotely control the smart meter through a wireless network or a wired network.

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