Ground fault section positioning device
By designing a ground fault segment positioning device, the main clock synchronization is achieved using Beidou timing and synchronization pulses, the existing FTU has solved the problem of insufficient measurement accuracy and sampling rate in ground fault analysis, and achieved high-precision fault positioning and analysis success rate improvement.
Patent Information
- Application Number
- CN202421674750.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-16
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-07-16
AI Technical Summary
The existing FTUs have insufficient measurement accuracy and sampling rate in the analysis of grounding faults, and cannot correctly judge fault characteristics, especially for grounding faults and instantaneous grounding faults. The analysis rate is low and fault trip isolation cannot be performed.
Design a ground fault segment positioning device to realize main clock synchronization through Beidou timing and synchronization pulses to solve the problem of wide-area synchronous sampling. The device shares the power supply power supply, zero-sequence voltage, and zero-sequence current signals of the existing FTU. It uses a high-precision synchronous measurement unit and a real-time communication unit to upload recorded wave data to the main station for fault location through 4G or 5G.
It realizes high-precision positioning of the ground fault segment, improves the success rate of ground fault analysis, avoids the replacement requirement for existing FTUs, reduces costs, and maintains the functional integrity of existing FTUs.
Smart Images
Figure CN223022352U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of distribution network monitoring, and particularly relates to a grounding fault section positioning device. Background Art
[0002] The existing distribution overhead lines mainly use feeder terminal units (FTUs) for grounding fault judgment and isolation protection. The FTU judges the grounding fault according to the zero-sequence current and zero-sequence voltage signals collected by itself. However, in practical applications, due to the problems of the measurement accuracy and sampling rate of the existing FTUs, and only using the local single-point FTU measurement information, it is impossible to make correct judgments on grounding faults with very small fault characteristics and instantaneous grounding faults. Due to the low grounding fault judgment rate, currently the FTU only alarms and does not execute the tripping isolation of the fault.
[0003] At present, a centralized judgment method is proposed. At the moment of grounding fault, the zero-sequence voltage and zero-sequence current waveforms collected by each FTU are uniformly retrieved to the master station, and the master station locates the fault through the topological structure and the recorded waveforms of each FTU. This method using multi-point data greatly improves the success rate of grounding fault judgment, but the premise is that the waveform data collected by each FTU on the line can be accurately synchronized. Otherwise, the comparison between the data will be meaningless, and the currently installed FTUs do not have the function of wide-area synchronous sampling.
[0004] In view of the above problems, the designer actively conducts research and innovation in order to create a grounding fault section positioning device with industrial utilization value. Content of the Utility Model
[0005] To solve the above technical problems, the purpose of the utility model is to provide a grounding fault section positioning device.
[0006] To achieve the above purpose, the utility model adopts the following technical solutions:
[0007] A grounding fault section positioning device includes a positioning device housing, a power supply connector, a zero-sequence voltage connector, a current input aviation plug interface, and a current output aviation plug interface. A positioning processing unit is installed in the positioning device housing. The positioning processing unit is connected to the power supply connector externally connected to the positioning device housing and used for connecting the power signal of the FTU. The positioning processing unit is connected to the zero-sequence voltage connector externally connected to the positioning device housing and used for connecting the zero-sequence voltage signal of the FTU. The positioning processing unit is connected to the current input aviation plug interface externally connected to the positioning device housing and used for connecting the standard aviation plug cable of the primary switch current output signal. The positioning processing unit is connected to the current output aviation plug interface externally connected to the positioning device housing and used for connecting the standard aviation plug cable of the FTU current input signal. The positioning processing unit is connected to the antenna connector externally connected to the positioning device housing, and the antenna connector is connected to the antenna.
[0008] Preferably, for the described ground fault section location device, the antenna is a 4G antenna or a Beidou antenna.
[0009] Preferably, for the described ground fault section location device, the location processing unit includes a PCB board, and connected to the PCB board are a central processor, a voltage conditioning unit, a current conditioning unit, a synchronous measurement unit, a power management unit, a data storage unit, a real-time communication unit, and a synchronous time service unit;
[0010] The output end of the power management unit is connected to the input end of the central processor, the output end of the data storage unit is connected to the input end of the central processor, the real-time communication unit and the synchronous time service unit are interconnected with the central processor, the output end of the voltage conditioning unit is connected to the voltage input end of the synchronous measurement unit, the output end of the current conditioning unit is connected to the current input end of the synchronous measurement unit, and the output end of the synchronous measurement unit is connected to the input end of the central processor.
[0011] Preferably, for the described ground fault section location device, the central processor is a 32-bit low-power processor, and its model is AM1806EZWTD4.
[0012] Preferably, for the described ground fault section location device, the synchronous measurement unit is a 16-bit high-precision analog-to-digital conversion chip, and its model is ADS8568.
[0013] Preferably, for the described ground fault section location device, the synchronous time service unit is compatible with Beidou and GPS, and its model is MAX-M10S.
[0014] Preferably, for the described ground fault section location device, the voltage conditioning unit includes a voltage signal converter and a filter conditioning circuit, wherein the model of the voltage signal converter is TV5402-13V / 3.53V.
[0015] Preferably, for the described ground fault section location device, the current conditioning unit includes a current signal converter and a filter conditioning circuit, wherein the model of the current signal converter is WGSLO-330A / 3.53V.
[0016] Preferably, for the described ground fault section location device, the communication mode of the real-time communication unit is 4G communication or 5G communication.
[0017] Preferably, for the described ground fault section location device, a rechargeable battery is connected inside the power management unit.
[0018] Preferably, for the described grounding fault section location device, the rechargeable battery is a 24V lead-acid battery.
[0019] With the above solution, the present utility model has at least the following advantages:
[0020] 1. The present utility model realizes the synchronization of the main clock through Beidou time service and synchronous pulses, so as to achieve the synchronization of sampling data between devices.
[0021] 2. The present utility model does not need to replace the existing FTU. As a supplement to the existing FTU, this device shares the power supply, zero-sequence voltage, and zero-sequence current signals of the existing FTU, and there is no need to install zero-sequence CT and zero-sequence PT equipment again, which can save costs.
[0022] 3. The present utility model can keep the functions of the existing FTU unchanged, only perform synchronous recording for grounding faults, upload the collected high-precision synchronous recording data to the master station, and the master station uniformly judges the fault section.
[0023] 4. The present utility model uploads the recording data to the master station through 4G or 5G, and can adapt to the existing distribution network communication protocol or MQTT Internet of Things protocol according to the requirements of the master station.
[0024] The above description is only an overview of the technical solution of the present utility model. In order to be able to understand the technical means of the present utility model more clearly and implement it according to the content of the specification, the following takes the preferred embodiments of the present utility model and combines the attached drawings to describe in detail as follows. Description of the Drawings
[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.
[0026] Figure 1 is the structural schematic diagram of the present utility model;
[0027] Figure 2 is the principle block diagram of the positioning processing unit of the present utility model;
[0028] Figure 3 is the filter conditioning circuit diagram in the voltage conditioning unit of the present utility model;
[0029] Figure 4 is the filter conditioning circuit diagram in the current conditioning unit of the present utility model;
[0030] Figure 5This is the circuit diagram of the synchronous time synchronization unit of the present utility model.
[0031] The meanings of the reference numerals in the figure are as follows.
[0032] 1 Positioning device housing 2 Positioning processing unit
[0033] 3 Power supply connector 4 Zero-sequence voltage connector
[0034] 5 Current input aviation plug interface 6 Current output aviation plug interface
[0035] 7 Antenna connector 8 Antenna
[0036] 9 Central processing unit 10 Voltage conditioning unit
[0037] 11 Current conditioning unit 12 Synchronous measurement unit
[0038] 13 Power management unit 14 Data storage unit
[0039] 15 Real-time communication unit 16 Synchronous time synchronization unit Detailed implementation manners
[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated herein can be arranged and designed in various different configurations.
[0041] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application claimed, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application.
[0042] Embodiment
[0043] As Figures 1 to 5As shown in the figure, a ground fault section location device includes a location device housing 1, a power supply connector 3, a zero-sequence voltage connector 4, a current input aviation plug interface 5, and a current output aviation plug interface 6. A location processing unit 2 is installed in the location device housing 1. The location processing unit 2 is connected to the power supply connector 3 externally connected to the location device housing 1 and used to connect the power signal of the FTU. The location processing unit 2 is connected to the zero-sequence voltage connector 4 externally connected to the location device housing 1 and used to connect the zero-sequence voltage signal of the FTU. The location processing unit 2 is connected to the current input aviation plug interface 5 externally connected to the location device housing 1 and used to connect the standard aviation plug cable of the primary switch current output signal. The location processing unit 2 is connected to the current output aviation plug interface 6 externally connected to the location device housing 1 and used to connect the standard aviation plug cable of the FTU current input signal. The location processing unit 2 is connected to the antenna connector 7 externally connected to the location device housing 1, and the antenna connector 7 is connected to the antenna 8.
[0044] This device is installed beside the existing FTU, sharing the zero-sequence voltage and zero-sequence current signals of the primary equipment, solving the problem of wide-area synchronous sampling, and being able to well adapt to the centralized judgment of ground faults.
[0045] Combined with a preferred embodiment of the present utility model, considering the communication convenience during use, the antenna 8 is a 4G and Beidou integrated antenna. Two sets of independently designed antennas can also be used, and the antennas are fixed on the top of the device.
[0046] In the present utility model, the power supply connector 3 is connected in parallel with the power supply and voltage signal of the FTU. The power cord is connected to the FTU power terminal through the waterproof power supply connector 3, and the zero-sequence voltage signal cable is connected to the FTU zero-sequence voltage terminal through the waterproof zero-sequence voltage connector 4.
[0047] The current input aviation plug interface 5 and the current output aviation plug interface 6 of the present utility model are connected in series with the current signal of the FTU. The current signal of the primary side switch enters the current input aviation plug interface 5 through the standard aviation plug cable and is then output to the FTU current aviation plug input end through the current output aviation plug interface 6. Using the standard aviation plug is convenient for installation.
[0048] As Figure 2 shown, the location processing unit 2 includes a PCB board, and a central processor 9, a voltage conditioning unit 10, a current conditioning unit 11, a synchronous measurement unit 12, a power management unit 13, a data storage unit 14, a real-time communication unit 15, and a synchronous time service unit 16 are connected to the PCB board;
[0049] The output end of the power management unit 13 is connected to the input end of the central processing unit 9. The output end of the data storage unit 14 is connected to the input end of the central processing unit 9. The real-time communication unit 15 and the synchronous time synchronization unit 16 are interconnected with the central processing unit 9. The output end of the voltage conditioning unit 10 is connected to the voltage input end of the synchronous measurement unit 12. The output end of the current conditioning unit 11 is connected to the current input end of the synchronous measurement unit 12. The output end of the synchronous measurement unit 12 is connected to the input end of the central processing unit 9.
[0050] Considering the need for continuous operation, there is a rechargeable battery inside the power management unit for powering the device in the power-off state. The battery is a 24V lead-acid battery.
[0051] At the same time, the adopted central processing unit 9 is a 32-bit low-power processor, and its model is AM1806EZWTD4, which is mainly used for sampling control, synchronous calculation, waveform recording and storage, and data uploading.
[0052] The synchronous time synchronization unit 16 is compatible with Beidou and GPS, and its model is MAX-M10S. It realizes synchronization through Beidou time synchronization and synchronous second pulse signal, and provides an accurate clock to the central processing unit 9 for sampling clock synchronization.
[0053] Furthermore, the synchronous measurement unit 12 adopts a 16-bit high-precision analog-to-digital chip with the model ADS8568, which can provide a measurement accuracy of 0.5 level.
[0054] In the present utility model, the communication mode of the real-time communication unit 15 is 4G communication or 5G communication.
[0055] In the present utility model, the voltage conditioning unit 10 includes a voltage signal converter and a filter conditioning circuit, and its model is TV5402-13V / 3.53V 3.
[0056] In the present utility model, the current conditioning unit 11 includes a current signal converter and a filter conditioning circuit, and its model is WGSLO-3 30A / 3.53V3.
[0057] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.
[0058] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. It 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 should not be construed as a limitation to the present application. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance.
[0059] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.
[0060] In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "install", "connect", "couple" 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 or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.
[0061] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can still be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.
Claims
1. A ground fault section locating device, comprising a locating device housing (1), a power connector (3), a zero-sequence voltage connector (4), a current input aviation plug interface (5) and a current output aviation plug interface (6), characterized in that: A positioning processing unit (2) is installed in the positioning device housing (1), and the positioning processing unit (2) is connected to a power connector (3) externally connected to the positioning device housing (1) and used to connect the power signal of the FTU, the positioning processing unit (2) is connected to a zero-sequence voltage connector (4) externally connected to the positioning device housing (1) and used to connect the zero-sequence voltage signal of the FTU, the positioning processing unit (2) is connected to a current input aviation plug interface (5) externally connected to the positioning device housing (1) and used to connect a standard aviation plug cable for a primary switch current output signal, the positioning processing unit (2) is connected to a current output aviation plug interface (6) externally connected to the positioning device housing (1) and used to connect the standard aviation plug cable for the current input signal of the FTU, and the positioning processing unit (2) is connected to an antenna connector (7) externally connected to the positioning device housing (1), and the antenna connector (7) is connected to an antenna (8).
2. A ground fault section locating device according to claim 1, characterized in that: The antenna (8) is a 4G or Beidou antenna.
3. A ground fault section locating device according to claim 1, characterized in that: The positioning processing unit (2) comprises a PCB board, on which a central processing unit (9), a voltage conditioning unit (10), a current conditioning unit (11), a synchronous measurement unit (12), a power management unit (13), a data storage unit (14), a real-time communication unit (15) and a synchronous timing unit (16) are connected; The output end of the power management unit (13) is connected to the input end of the central processing unit (9), the output end of the data storage unit (14) is connected to the input end of the central processing unit (9), the real-time communication unit (15) and the synchronous timing unit (16) are interconnected with the central processing unit (9), the output end of the voltage conditioning unit (10) is connected to the voltage input end of the synchronous measurement unit (12), the output end of the current conditioning unit (11) is connected to the current input end of the synchronous measurement unit (12), and the output end of the synchronous measurement unit (12) is connected to the input end of the central processing unit (9).
4. A ground fault section locating device according to claim 3, characterized in that: The central processing unit (9) is a 32-bit low-power processor, and its model is AM1806EZWTD4.
5. A ground fault section locating device according to claim 3, characterized in that: The synchronous measurement unit (12) is a 16-bit high-precision digital-to-analog conversion chip, and its model is ADS8568.
6. A ground fault section locating device according to claim 3, characterized in that: The voltage conditioning unit (10) comprises a voltage signal converter and a filter conditioning circuit, wherein the model of the voltage signal converter is TV5402-13V / 3.53V.
7. A ground fault section locating device according to claim 3, characterized in that: The current conditioning unit (11) comprises a current signal converter and a filter conditioning circuit, wherein the model of the current signal converter is WGSLO-3 30A / 3.53V.
8. A ground fault section locating device according to claim 3, characterized in that: The communication mode of the real-time communication unit (15) is 4G communication or 5G communication.
9. A ground fault section locating device according to claim 3, characterized in that: The power management unit (13) is internally connected to a rechargeable battery, which is a 24V lead-acid battery.
10. A ground fault section locating device according to claim 3, characterized in that: The synchronous timing unit (16) is compatible with Beidou and GPS, and its model is MAX-M10S.