Power distribution network fault detection device and detection method

Abstract

The invention relates to the technical field of power grid operation and maintenance management, and particularly discloses a power distribution network fault detection device and method. At least two current acquisition devices; the distribution transformer terminal is in communication connection with the at least two voltage acquisition devices and the at least two current acquisition devices and is used for determining a fault between the wire outlet end of the high-voltage end device and the wire inlet end of the low-voltage end device according to the first voltage and the first current; and the fault detection module is used for determining a fault between the wire outlet end of the low-voltage end equipment and the wire inlet end of the user end equipment according to the second voltage and the second current. According to the power distribution network fault detection device, the technical problem of low accuracy of power distribution network fault detection in the prior art is solved, and the technical effect of improving the accuracy of power distribution network fault detection is achieved.

Description

Technical Field

[0001] This application relates to the technical field of power grid operation and maintenance management, and particularly to a power distribution network fault detection device and method. Background Art

[0002] Power distribution network operation and maintenance refers to the operation, maintenance, inspection, debugging, and replacement of power distribution network equipment including substation internal equipment, transmission equipment, and user-side equipment. The daily inspection and maintenance of the power distribution network is a very important part of the power distribution network operation and maintenance work.

[0003] Currently, the daily inspection and maintenance in the operation and maintenance of China's power distribution network mainly rely on on-site human input. The power distribution network is complex and there are many nodes to be monitored in the operation and maintenance, so it is difficult to monitor each node in real time. Once a fault occurs, it is difficult for the staff to quickly determine the specific section where the fault occurs in the power distribution network, resulting in low accuracy in power distribution network fault detection. Summary of the Invention

[0004] Based on this, it is necessary to provide a power distribution network fault detection device and method for the problem of low accuracy in power distribution network fault detection.

[0005] A power distribution network fault detection device includes:

[0006] At least two voltage acquisition devices, respectively used for acquiring a first voltage between the outgoing end of the high-voltage end device of the power distribution network and the incoming end of the low-voltage end device, and a second voltage between the outgoing end of the low-voltage end device and the incoming end of the user-side device of the power distribution network;

[0007] At least two current acquisition devices, respectively used for acquiring a first current between the outgoing end of the high-voltage end device and the incoming end of the low-voltage end device, and a second current between the outgoing end of the low-voltage end device and the incoming end of the user-side device;

[0008] A distribution transformer terminal, respectively communicatively connected to the at least two voltage acquisition devices and the at least two current acquisition devices, for determining a fault between the outgoing end of the high-voltage end device and the incoming end of the low-voltage end device according to the first voltage and the first current; and for determining a fault between the outgoing end of the low-voltage end device and the incoming end of the user-side device according to the second voltage and the second current.

[0009] In one embodiment, the distribution transformer terminal includes:

[0010] A line loss fault determination module, which is respectively communicatively connected to the at least two voltage acquisition devices and the at least two current acquisition devices, and is used to determine the line loss between the outgoing end of the high-voltage terminal device and the incoming end of the low-voltage terminal device according to the first voltage and the first current; and is used to determine the line loss between the outgoing end of the low-voltage terminal device and the incoming end of the user terminal device according to the second voltage and the second current;

[0011] A power outage fault determination module, which is respectively communicatively connected to the at least two voltage acquisition devices, and is used to determine whether there is a power outage between the outgoing end of the high-voltage terminal device and the incoming end of the low-voltage terminal device according to the first voltage; and is used to determine whether there is a power outage between the outgoing end of the low-voltage terminal device and the incoming end of the user terminal device according to the second voltage.

[0012] In one embodiment, the power distribution network fault detection device further includes:

[0013] A concentrator, which is communicatively connected to the distribution transformer terminal, and is used to collect the power consumption data of the user terminal device and send it to the distribution transformer terminal.

[0014] In one embodiment, the at least two voltage acquisition devices and the at least two current acquisition devices are wirelessly connected to the distribution transformer terminal;

[0015] The concentrator is wirelessly connected to the distribution transformer terminal.

[0016] In one embodiment, the power distribution network fault detection device further includes:

[0017] A temperature acquisition device, which is connected to the power distribution network and is used to collect the temperature of the power distribution network.

[0018] In one embodiment, the power distribution network fault detection device further includes:

[0019] An alarm device, which is communicatively connected to the temperature acquisition device, and is used to send an alarm signal when the temperature of the power distribution network exceeds a preset threshold.

[0020] The above-mentioned power distribution network fault detection device;

[0021] A system master station, which is communicatively connected to the distribution transformer terminal, and is used to receive and record the faults between the outgoing end of the high-voltage terminal device and the incoming end of the low-voltage terminal device, and the faults between the outgoing end of the low-voltage terminal device and the incoming end of the user terminal device.

[0022] A power distribution network fault detection method includes:

[0023] Obtain the first voltage and the first current between the outgoing terminal of the high-voltage terminal device and the incoming terminal of the low-voltage terminal device, and the second voltage and the second current between the outgoing terminal of the low-voltage terminal device and the incoming terminal of the user terminal device;

[0024] Determine a fault between the outgoing terminal of the high-voltage terminal device and the incoming terminal of the low-voltage terminal device according to the first voltage and the first current;

[0025] Determine a fault between the outgoing terminal of the low-voltage terminal device and the incoming terminal of the user terminal device according to the second voltage and the second current.

[0026] In one embodiment, the fault includes a line loss fault and / or a power outage fault.

[0027] In one embodiment, when the fault is a line loss fault,

[0028] The determining the fault between the outgoing terminal of the high-voltage terminal device and the incoming terminal of the low-voltage terminal device according to the first voltage and the first current includes:

[0029] Determine the line loss between the high-voltage terminal device and the low-voltage terminal device according to the formula S1 = U1I1, where: S1 represents the line loss between the outgoing terminal of the high-voltage terminal device and the incoming terminal of the low-voltage terminal device, U1 represents the first voltage, and I1 represents the first current;

[0030] The determining the fault between the outgoing terminal of the low-voltage terminal device and the incoming terminal of the user terminal device according to the second voltage and the second current includes:

[0031] Determine the line loss between the high-voltage terminal device and the low-voltage terminal device according to the formula S2 = U2I2, where: S2 represents the line loss between the outgoing terminal of the low-voltage terminal device and the incoming terminal of the user terminal device, U2 represents the second voltage, and I2 represents the second current.

[0032] In one embodiment, when the fault is a power outage fault, the determining the fault between the outgoing terminal of the high-voltage terminal device and the incoming terminal of the low-voltage terminal device according to the first voltage and the first current includes:

[0033] If the first voltage is 0, determine that a power outage fault occurs between the outgoing terminal of the high-voltage terminal device and the incoming terminal of the low-voltage terminal device;

[0034] The determining the fault between the outgoing terminal of the low-voltage terminal device and the incoming terminal of the user terminal device according to the second voltage and the second current includes:

[0035] When the second voltage is 0, it is determined that a power outage fault occurs between the outgoing terminal of the low-voltage end device and the incoming terminal of the user-end device.

[0036] The embodiment of the present application provides a power distribution network fault detection device, including: at least two voltage acquisition devices, at least two current acquisition devices, and a distribution transformer terminal. The distribution transformer terminal is respectively communicatively connected with the at least two voltage acquisition devices and the at least two current acquisition devices. According to the first voltage and the first current, the fault between the outgoing terminal of the high-voltage end device and the incoming terminal of the low-voltage end device can be determined. According to the second voltage and the second current, the fault between the outgoing terminal of the low-voltage end device and the incoming terminal of the user-end device can be determined. When any parameter among the first voltage, the first current, the second voltage, and the second current appears abnormally, the specific section where the fault occurs in the power distribution network can be determined according to the abnormal parameter. Thus, the staff can quickly locate the fault location, and then further investigate and repair the fault. The power distribution network fault detection device in the embodiment of the present application solves the technical problem of low accuracy in power distribution network fault detection in the prior art, and achieves the technical effect of improving the accuracy of power distribution network fault detection. Description of the Drawings

[0037] Figure 1 It is a schematic diagram of the application scenario of the power distribution network fault detection device in an embodiment of the present application;

[0038] Figure 2 It is a schematic diagram of the structure of the power distribution network fault detection device in an embodiment of the present application;

[0039] Figure 3 It is a schematic diagram of the structure of the distribution transformer terminal of the power distribution network fault detection device in an embodiment of the present application;

[0040] Figure 4 It is a schematic diagram of the structure of the power distribution network fault detection device in an embodiment of the present application;

[0041] Figure 5 It is a schematic diagram of the structure of the temperature acquisition device and the alarm device of the power distribution network fault detection device in an embodiment of the present application;

[0042] Figure 6 It is a schematic diagram of the structure of the power distribution network fault detection system in an embodiment of the present application;

[0043] Figure 7 It is a schematic diagram of the flow of the power distribution network fault detection method in an embodiment of the present application.

[0044] Description of the Reference Numerals:

[0045] 10. Power distribution network fault detection device; 100. Voltage acquisition device; 200. Current acquisition device; 300. Distribution transformer terminal; 310. Line loss fault determination module; 320. Power outage fault determination module; 400. Concentrator; 500. Temperature acquisition device; 600. Alarm device; 700. System master station; 20. Power distribution network fault detection system. Detailed implementation manners

[0046] In order to make the objectives, technical solutions and advantages of the present application clearer, the power distribution network fault detection device, system and method of the present application will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0047] The serial numbers assigned to the components in this document itself, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. The "connection" and "coupling" mentioned in the present application, unless otherwise specified, both include direct and indirect connections (couplings). In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present application.

[0048] In the present application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0049] Please refer to Figure 1, a power distribution network fault detection device 10 provided by an embodiment of the present application is used to detect faults of high-voltage terminal devices, low-voltage terminal devices, and user-terminal devices in the power distribution network. The devices in the power distribution network generally include: power generation stations, transformers, transmission equipment, distribution rooms, main switches, each branch cable, and each branch switch, etc. Among them, the high-voltage terminal devices include: power generation stations, transformers, etc., the low-voltage terminal devices include: transmission equipment, distribution rooms, electrical cabinets, concentrators, etc., and the user-terminal devices include: user-terminal main switches, user electricity meters, branch cables, branch switches, etc. Hereinafter, taking the power distribution network fault detection device described in the embodiment of the present application being applied to transformers, distribution rooms, and user-terminal main switches as an example for illustration.

[0050] Please refer to Figure 2 , a power distribution network fault detection device provided by an embodiment of the present application includes: at least two voltage acquisition devices, at least two current acquisition devices, and a distribution transformer terminal.

[0051] The at least two voltage acquisition devices are respectively used to acquire a first voltage between the outgoing line end of the high-voltage terminal device of the power distribution network and the incoming line end of the low-voltage terminal device of the power distribution network, and a second voltage between the outgoing line end of the low-voltage terminal device and the incoming line end of the user-terminal device of the power distribution network. The at least two voltage acquisition devices 100 can segmentally acquire the voltage data in the power distribution network, so that the detection of the voltage data in the power distribution network can be sectionalized, improving the accuracy of the staff's monitoring of the voltage data in the power distribution network, and ensuring that once a fault occurs in the power distribution network, the staff can discover it in time and accurately locate it.

[0052] In this embodiment, the high-voltage terminal device can be a transformer, the low-voltage terminal device can be a distribution room, and the user-terminal device can be the user-terminal main switch. The at least two voltage acquisition devices can be respectively arranged between the outgoing line end of the transformer and the incoming line end of the distribution room, and between the outgoing line end of the distribution room and the incoming line end of the user-terminal main switch. The voltage acquisition device can adopt a voltage transformer, a voltmeter, etc. The voltage transformer can be applied to all sections of high voltage and low voltage, which is convenient and safe to use. The voltmeter is cheap and easy to obtain, and is suitable for large-area use. The number of the voltage acquisition devices in this embodiment is not limited in any way, and can be specifically set according to the actual needs of detection in the power distribution network.

[0053] The at least two current acquisition devices are respectively used to acquire a first current between the outgoing line end of the high-voltage end device and the incoming line end of the low-voltage end device, and a second current between the outgoing line end of the low-voltage end device and the incoming line end of the user-end device. The at least two current acquisition devices can segmentally acquire the current data in the power distribution network, so that the detection of the current data in the power distribution network can be sectioned, thereby improving the accuracy of the staff's monitoring of the current data in the power distribution network and ensuring that once a fault occurs in the power distribution network, the staff can discover it in time and accurately locate it.

[0054] In this embodiment, the high-voltage end device can be a transformer, the low-voltage end device can be a distribution substation, and the user-end device can be the user-end main switch. The at least two current acquisition devices can be respectively arranged between the outgoing line end of the transformer and the incoming line end of the distribution substation, and between the outgoing line end of the distribution substation and the incoming line end of the user-end main switch. The current acquisition device can be a current transformer, an ammeter, etc. The current transformer can be applied to all sections of high voltage and low voltage, which is convenient and safe to use. The ammeter is cheap and easy to obtain, and is suitable for large-area use. The number of the current acquisition devices in this embodiment is not limited in any way, and can be specifically set according to the actual needs of detection in the power distribution network.

[0055] The distribution transformer terminal is respectively communicatively connected to the at least two voltage acquisition devices and the at least two current acquisition devices, and is used to determine a fault between the outgoing line end of the high-voltage end device and the incoming line end of the low-voltage end device according to the first voltage and the first current; and is used to determine a fault between the outgoing line end of the low-voltage end device and the incoming line end of the user-end device according to the second voltage and the second current. The distribution transformer terminal can be a computer device including but not limited to a personal computer, a laptop computer, a smart phone, a tablet computer, and a portable wearable device. The fault can be a short circuit, an open circuit, a leakage, a power outage, and a line loss in the power distribution network, etc.

[0056] The distribution transformer terminal is the core of the power distribution network fault detection device described in this embodiment, and the distribution transformer terminal can be set in the distribution room. The distribution transformer terminal can be wirelessly connected to the at least two voltage acquisition devices and the at least two current acquisition devices respectively, such as: Bluetooth, GPRS, WiFi, and Sub-GHz wireless communication, etc. In this embodiment, the distribution transformer terminal can be connected to the at least two voltage acquisition devices and the at least two current acquisition devices respectively by using the Sub-GHz wireless communication method. The Sub-GHz wireless communication frequency band is small and the power consumption is low, which is suitable for the long-distance transmission between the at least two voltage acquisition devices and the at least two current acquisition devices and the distribution transformer. The distribution transformer terminal can also be connected to the at least two voltage acquisition devices and the at least two current acquisition devices respectively by wired connection, such as: connected by a digital data circuit (DNN), RS-485 communication, etc. The RS-485 communication supports one-to-many communication, can support the distribution transformer terminal to connect multiple voltage acquisition devices and current acquisition devices, and the conversion interface cost of the RS-485 communication is low, which is suitable for large-area setting. The distribution transformer terminal in this embodiment can adopt a DFCS45-DX type low-voltage branch operation monitoring terminal, which has multiple branch monitoring lines and can realize the monitoring of the operation of multiple branches. The high-voltage end data and the low-voltage end data received by the distribution transformer terminal are both backed up multiple times, and a redundant design is adopted in terms of security to ensure that the processing and analysis of the high-voltage end data and the low-voltage end data are more reliable.

[0057] The working principle of the power distribution network fault detection device described in this embodiment is as follows:

[0058] The at least two voltage acquisition devices respectively acquire the first voltage between the outgoing line end of the high-voltage end device and the incoming line end of the low-voltage end device and the second voltage between the outgoing line end of the low-voltage end device and the incoming line end of the user-end device. The at least two current acquisition devices respectively acquire the first current between the outgoing line end of the high-voltage end device and the incoming line end of the low-voltage end device and the second current between the outgoing line end of the low-voltage end device and the incoming line end of the user-end device. If any parameter among the first voltage, the first current, the second voltage, and the second current appears abnormal, the distribution transformer terminal can determine the type and section location of the fault occurring in the power distribution network through this parameter.

[0059] An embodiment of the present application provides a power distribution network fault detection device, including: at least two voltage acquisition devices, at least two current acquisition devices, and a distribution transformer terminal. The distribution transformer terminal is communicatively connected to the at least two voltage acquisition devices and the at least two current acquisition devices respectively. According to the first voltage and the first current, the fault between the outgoing end of the high-voltage terminal device and the incoming end of the low-voltage terminal device can be determined. According to the second voltage and the second current, the fault between the outgoing end of the low-voltage terminal device and the incoming end of the user terminal device can be determined. When any of the first voltage, the first current, the second voltage, and the second current is abnormal, the specific section where the fault occurs in the power distribution network can be determined according to the abnormal parameter, so that the staff can quickly locate the fault location, and then further investigate and repair the fault. The power distribution network fault detection device provided by this embodiment solves the technical problem of low accuracy in power distribution network fault detection in the prior art, and achieves the technical effect of improving the accuracy of power distribution network fault detection.

[0060] Please refer to Figure 3 , a power distribution network fault detection device provided by an embodiment of the present application, the distribution transformer terminal includes: a line loss fault determination module and a power outage fault determination module.

[0061] The line loss fault determination module is communicatively connected to the at least two voltage acquisition devices and the at least two current acquisition devices respectively, and is used to determine the line loss between the outgoing end of the high-voltage terminal device and the incoming end of the low-voltage terminal device according to the first voltage and the first current; and is used to determine the line loss between the outgoing end of the low-voltage terminal device and the incoming end of the user terminal device according to the second voltage and the second current. The line loss fault determination module can be a computer device including but not limited to a personal computer, a laptop computer, a smart phone, a tablet computer, and a portable wearable device. In this embodiment, the line loss fault determination module is not specifically limited, as long as it can realize the function of determining the line loss between the outgoing end of the high-voltage terminal device and the incoming end of the low-voltage terminal device according to the first voltage and the first current, and determining the line loss between the outgoing end of the low-voltage terminal device and the incoming end of the user terminal device according to the second voltage and the second current. Through the line loss fault determination module, the detection of the line loss fault in the power distribution network can be realized, so that the staff can discover and determine the specific location of the line loss fault in the first time, and improve the efficiency of the maintenance in the power distribution network.

[0062] The power outage fault determination module is respectively communicatively connected to the at least two voltage acquisition devices, and is configured to determine whether there is a power outage between the outgoing end of the high-voltage terminal device and the incoming end of the low-voltage terminal device according to the first voltage; and to determine whether there is a power outage between the outgoing end of the low-voltage terminal device and the incoming end of the user terminal device according to the second voltage. The power outage fault determination module The distribution transformer terminal can be a computer device including but not limited to a personal computer, a laptop computer, a smart phone, a tablet computer, and a portable wearable device. In this embodiment, no specific limitation is imposed on the power outage fault determination module, as long as it can implement the function of determining whether there is a power outage between the outgoing end of the high-voltage terminal device and the incoming end of the low-voltage terminal device according to the first voltage, and determining whether there is a power outage between the outgoing end of the low-voltage terminal device and the incoming end of the user terminal device according to the second voltage. Through the power outage fault determination module, the detection of power outage faults in the power distribution network can be realized, so that the staff can discover and determine the specific location of the power outage fault in the first time, and improve the efficiency of maintenance in the power distribution network.

[0063] In one embodiment, the number of the voltage acquisition devices and the current acquisition devices can be specifically set according to the points to be monitored in the power distribution network. For example, both the voltage acquisition device and the current acquisition device can be increased to five, and are respectively arranged at the outgoing end of the transformer, the incoming end of the distribution substation, the outgoing end of the distribution substation, the incoming end of the main switch of the user terminal, and the outgoing end of the main switch of the user terminal. In this way, the power distribution network fault detection device in this embodiment can detect the voltage and current of five sections, so as to realize the voltage and current monitoring of the five most important nodes in the power distribution network.

[0064] Please refer to Figure 4, in one embodiment, the power distribution network fault detection device further includes a concentrator. The concentrator 400 is communicatively connected to the distribution transformer terminal 300 and is used to collect the electrical energy data of the user equipment and send it to the distribution transformer terminal 300. The distribution transformer terminal 300 can collect the electrical energy data of the user equipment through the concentrator 400, and thus directly judge whether the user equipment has a fault through the electrical energy data. Thereby improving the comprehensiveness of the power distribution network fault detection device 10 in this embodiment for fault detection in the power distribution network. The concentrator 400 and the distribution transformer terminal 300 can be wirelessly connected, such as: Bluetooth, GPRS, WiFi, and Sub-GHz wireless communication, etc. The concentrator 400 and the distribution transformer terminal 300 can also be wired connected, such as: digital data circuit (DNN) connection or RS-485 communication connection. RS-485 communication supports one-to-many communication and can support the distribution transformer terminal 300 to connect to multiple concentrators 400. And the conversion interface cost of the RS-485 communication is low and is suitable for large-area setting. The concentrator 400 in this embodiment can be DJGZ33-WFET1600 or CL818C, both of which have RS-485 communication interfaces and can achieve one-to-many communication. This embodiment does not specifically limit the concentrator 400, as long as it can meet the functions of collecting and sending the electrical energy data of the user equipment.

[0065] Please refer to Figure 5 , in one embodiment, the power distribution network fault detection device 10 further includes: a temperature acquisition device 500 and an alarm device 600.

[0066] The temperature acquisition device 500 is connected to the power distribution network and is used to acquire the temperature of the power distribution network. The temperature acquisition device 500 can be one or multiple. When there are multiple temperature acquisition devices 500, they can be respectively arranged on any device or line in the power distribution network that needs temperature detection, such as transformers, electric cabinets, switches, each branch line, etc. The temperature acquisition device 500 can acquire the temperature of each device or line in the power distribution network in real time, so as to ensure that once there is a device or line with abnormal temperature in the power distribution network, the staff can discover and handle it in time, thereby ensuring the stable and safe operation of the power distribution network. The temperature acquisition device 500 in this embodiment can be a DS18B20 digital temperature sensor, which has a small volume, low price, strong anti-interference ability and high precision. The temperature acquisition device 500 can also be implemented by a temperature detection circuit. This embodiment does not make any limitation on the temperature acquisition device 500, and it can be specifically set according to actual needs, as long as it can realize the temperature detection function for each device or line in the power distribution network.

[0067] The alarm device 600 is communicatively connected to the temperature acquisition device 500, and the alarm device 600 is used to send an alarm signal when the temperature of the power distribution network exceeds a preset threshold. The alarm device 600 and the temperature acquisition device 500 can be wirelessly connected or can be wired connected. The alarm device 600 can adopt an alarm or an alarm circuit. The alarm signal can be an optical signal, a sound signal, etc. The alarm device 600 sends an alarm signal to notify the staff when the temperature of the power distribution network exceeds the preset threshold, so that the staff can discover and handle it in time.

[0068] Please refer to Figure 6 , an embodiment of the present application provides a power distribution network fault detection system 20, including: the above-mentioned power distribution network fault detection device 10 and a system master station 700. The system master station 700 is communicatively connected to the distribution transformer terminal 300 and is used to receive and record the faults between the outgoing end of the high-voltage terminal device and the incoming end of the low-voltage terminal device, and the faults between the outgoing end of the low-voltage terminal device and the incoming end of the user terminal device. The power distribution network fault detection system 20 has all the beneficial effects of the above embodiments and will not be elaborated here.

[0069] An embodiment of the present application provides a power distribution network fault detection method, and the method can be applied to the above-mentioned power distribution network fault detection device 10 / power distribution network fault detection device system 20. The method is used to detect faults in the power distribution network. The following embodiments will be described by taking the method specifically applied to the distribution transformer terminal 300 as an example.

[0070] Please refer to Figure 7 , in one embodiment, the power distribution network fault detection method includes:

[0071] S100. Obtain the first voltage and the first current between the outgoing line end of the high-voltage terminal device and the incoming line end of the low-voltage terminal device, and the second voltage and the second current between the outgoing line end of the low-voltage terminal device and the incoming line end of the user terminal device.

[0072] In this embodiment, the high-voltage terminal device may be a transformer, the low-voltage terminal device may be a distribution substation, and the user terminal device may be a main switch at the user end. This embodiment takes the transformer, the distribution substation, and the main switch at the user end as examples to illustrate the power distribution network fault detection method. The first voltage and the second voltage can be collected by a voltage transformer or a voltmeter. The first current and the second current can be collected by a current transformer or an ammeter. For example: The voltmeter can be set between the outgoing line end of the transformer and the incoming line end of the distribution substation to obtain the first voltage. The voltmeter can be set between the outgoing line end of the distribution substation and the incoming line end of the main switch at the user end to obtain the second voltage. Similarly, the ammeter can be set between the outgoing line end of the transformer and the incoming line end of the distribution substation to obtain the first current. The ammeter can be set between the outgoing line end of the distribution substation and the incoming line end of the main switch at the user end to obtain the second current. The distribution transformer terminal 300 obtains the first voltage and the second voltage collected from the voltage transformer or the voltmeter, and at the same time obtains the first current and the second current collected from the current transformer or the ammeter, and caches or stores the first voltage, the second voltage, the first current, and the second current for use in the next step of processing.

[0073] S200. Determine the fault between the outgoing line end of the high-voltage terminal device and the incoming line end of the low-voltage terminal device according to the first voltage and the first current.

[0074] S300. Determine the fault between the outgoing line end of the low-voltage terminal device and the incoming line end of the user terminal device according to the second voltage and the second current.

[0075] General faults in the power distribution network may include: open circuit, short circuit, leakage, abnormal line loss, etc. When the power distribution network is in a normal working state, the first voltage, the second voltage, the first current, and the second current are all within the normal working parameter range. When a certain device or a certain section of line in the power distribution network fails, it will cause the current and voltage parameters corresponding to the device or the section of line to be abnormal. That is, when the voltage or current parameter corresponding to a certain device or a certain section of line in the power distribution network is abnormal, the distribution transformer terminal can determine that the device or the section of line has failed. In this embodiment, the distribution transformer terminal analyzes and processes the acquired first voltage, second voltage, first current, and second current. The distribution transformer terminal can determine whether a fault has occurred between the outlet end of the high-voltage terminal device and the inlet end of the low-voltage terminal device according to whether the first voltage and the first current are abnormal, and can determine whether a fault has occurred between the outlet end of the low-voltage terminal device and the inlet end of the user terminal device according to whether the second voltage and the second current are abnormal.

[0076] The power distribution network fault detection method provided in this embodiment only needs to use the first voltage, the second voltage, the first current, and the second current to realize the detection of power distribution network faults. The detection method is simple and easy to operate. The power distribution network fault detection method in this embodiment can automatically collect and process the voltage and current parameters in the power distribution network throughout the process, thereby reducing the operation difficulty of the power distribution network fault detection and improving the efficiency of the power distribution network fault detection.

[0077] In one embodiment, the faults in the power distribution network fault detection method include line loss faults and / or power outage faults.

[0078] The line loss fault in this embodiment can be the line loss in the transformer, the substation, or the user terminal device, or the line loss of the connecting cable between the transformer and the substation or the connecting cable between the substation and the user terminal device.

[0079] In a specific embodiment, when the fault is a line loss fault, the determination of the fault between the outlet end of the high-voltage terminal device and the inlet end of the low-voltage terminal device according to the first voltage and the first current includes:

[0080] Determine the line loss between the high-voltage terminal device and the low-voltage terminal device according to the formula S1 = U1I1, where: S1 represents the line loss between the outlet end of the high-voltage terminal device and the inlet end of the low-voltage terminal device, U1 represents the first voltage, and I1 represents the first current.

[0081] S300. Determining a fault between the outgoing terminal of the low-voltage terminal device and the incoming terminal of the user terminal device based on the second voltage and the second current includes:

[0082] Determining the line loss between the high-voltage terminal device and the low-voltage terminal device according to the formula S2 = U2I2, where: S2 represents the line loss between the outgoing terminal of the low-voltage terminal device and the incoming terminal of the user terminal device, U2 represents the second voltage, and I2 represents the second current.

[0083] The line loss fault determination method in this embodiment is simple and easy to operate, and is suitable for large-scale promotion and use in the field of power grid operation and maintenance management.

[0084] In a specific embodiment, when the fault is a power outage fault, S200. Determining a fault between the outgoing terminal of the high-voltage terminal device and the incoming terminal of the low-voltage terminal device based on the first voltage and the first current includes: If the first voltage is 0, it is determined that a power outage fault occurs between the outgoing terminal of the high-voltage terminal device and the incoming terminal of the low-voltage terminal device.

[0085] S300. Determining a fault between the outgoing terminal of the low-voltage terminal device and the incoming terminal of the user terminal device based on the second voltage and the second current includes: If the second voltage is 0, it is determined that a power outage fault occurs between the outgoing terminal of the low-voltage terminal device and the incoming terminal of the user terminal device.

[0086] The power outage fault determination method in this embodiment is simple and easy to operate, and is suitable for large-scale promotion and use in the field of power grid operation and maintenance management.

[0087] It should be understood that although the steps in the above flowcharts are shown in sequence according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless there is a clear indication in this article, the execution of these steps has no strict order limit, and these steps can be executed in other orders. Moreover, at least some of the steps in the above flowcharts may include multiple sub-steps or multiple 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 alternately or alternately with at least a part of other steps or sub-steps or stages of other steps.

[0088] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0089] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A power distribution network fault detection device, characterized in that, Comprising: At least two voltage acquisition devices, respectively used for acquiring a first voltage between an outgoing line end of a high-voltage end device of a power distribution network and an incoming line end of a low-voltage end device of the power distribution network, and a second voltage between an outgoing line end of the low-voltage end device and an incoming line end of a user-end device of the power distribution network; At least two current acquisition devices, respectively used for acquiring a first current between an outgoing line end of the high-voltage end device and an incoming line end of the low-voltage end device, and a second current between an outgoing line end of the low-voltage end device and an incoming line end of the user-end device; A distribution transformer terminal, communicatively connected to the at least two voltage acquisition devices and the at least two current acquisition devices respectively, for determining a fault between an outgoing line end of the high-voltage end device and an incoming line end of the low-voltage end device according to the first voltage and the first current; And for determining a fault between an outgoing line end of the low-voltage end device and an incoming line end of the user-end device according to the second voltage and the second current.

2. The power distribution network fault detection device according to claim 1, wherein The distribution transformer terminal includes: A line loss fault determination module, communicatively connected to the at least two voltage acquisition devices and the at least two current acquisition devices respectively, for determining a line loss between an outgoing line end of the high-voltage end device and an incoming line end of the low-voltage end device according to the first voltage and the first current; and for determining a line loss between an outgoing line end of the low-voltage end device and an incoming line end of the user-end device according to the second voltage and the second current; A power outage fault determination module, communicatively connected to the at least two voltage acquisition devices respectively, for determining whether there is a power outage between an outgoing line end of the high-voltage end device and an incoming line end of the low-voltage end device according to the first voltage; and for determining whether there is a power outage between an outgoing line end of the low-voltage end device and an incoming line end of the user-end device according to the second voltage.

3. The power distribution network fault detection device according to claim 1, characterized in that, It further includes: A concentrator, communicatively connected to the distribution transformer terminal, for acquiring power consumption data of the user-end device and sending it to the distribution transformer terminal.

4. The power distribution network fault detection device according to claim 3, wherein, The at least two voltage acquisition devices, the at least two current acquisition devices and the distribution transformer terminal are wirelessly connected; The concentrator and the distribution transformer terminal are wirelessly connected.

5. The power distribution network fault detection device according to claim 1, characterized in that, It further includes: A temperature acquisition device, connected to the power distribution network, for acquiring the temperature of the power distribution network.

6. The power distribution network fault detection device according to claim 5, characterized in that It further includes: An alarm device, communicatively connected to the temperature acquisition device, for sending an alarm signal when the temperature of the power distribution network exceeds a preset threshold.

7. A power distribution network fault detection method, characterized in that, Comprising: The power distribution network fault detection device (10) according to any one of claims 1-6; A system master station, communicatively connected to the distribution transformer terminal, for receiving and recording a fault between an outgoing line end of the high-voltage end device and an incoming line end of the low-voltage end device, and a fault between an outgoing line end of the low-voltage end device and an incoming line end of the user-end device.

8. A power distribution network fault detection method, characterized in that, Comprising: Obtaining a first voltage and a first current between an outgoing line end of a high-voltage end device and an incoming line end of a low-voltage end device, and a second voltage and a second current between an outgoing line end of the low-voltage end device and an incoming line end of a user-end device; Determining a fault between an outgoing line end of the high-voltage end device and an incoming line end of the low-voltage end device according to the first voltage and the first current; Determine a fault between the outgoing end of the low-voltage terminal device and the incoming end of the user terminal device according to the second voltage and the second current.

9. The power distribution network fault detection method according to claim 8, characterized in that The fault includes a line loss fault and / or a power outage fault.

10. The power distribution network fault detection method according to claim 9, characterized in that, When the fault is a line loss fault, the determination of the fault between the outgoing end of the high-voltage terminal device and the incoming end of the low-voltage terminal device according to the first voltage and the first current includes: Determine the line loss between the high-voltage terminal device and the low-voltage terminal device according to the formula S1 = U1I1, where: S1 represents the line loss between the outgoing end of the high-voltage terminal device and the incoming end of the low-voltage terminal device, U1 represents the first voltage, and I1 represents the first current; The determination of the fault between the outgoing end of the low-voltage terminal device and the incoming end of the user terminal device according to the second voltage and the second current includes: Determine the line loss between the high-voltage terminal device and the low-voltage terminal device according to the formula S2 = U2I2, where: S2 represents the line loss between the outgoing end of the low-voltage terminal device and the incoming end of the user terminal device, U2 represents the second voltage, and I2 represents the second current; When the fault is a power outage fault, the determination of the fault between the outgoing end of the high-voltage terminal device and the incoming end of the low-voltage terminal device according to the first voltage and the first current includes: If the first voltage is 0, determine that a power outage fault occurs between the outgoing end of the high-voltage terminal device and the incoming end of the low-voltage terminal device; If the second voltage is 0, determine that a power outage fault occurs between the outgoing end of the low-voltage terminal device and the incoming end of the user terminal device.

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