CN212723166U - Fault interval positioning device adopting LoRa mode communication - Google Patents
Fault interval positioning device adopting LoRa mode communication Download PDFInfo
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- CN212723166U CN212723166U CN201921666341.7U CN201921666341U CN212723166U CN 212723166 U CN212723166 U CN 212723166U CN 201921666341 U CN201921666341 U CN 201921666341U CN 212723166 U CN212723166 U CN 212723166U
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Abstract
The utility model provides a fault interval positioning device adopting LoRa communication, wherein a monitoring unit of the fault interval positioning device is connected with a monitoring background; the first monitoring unit and the second monitoring unit of the monitoring unit are in communication connection in an LoRa mode, and the first monitoring unit and the second monitoring unit are respectively connected with the direct grounding end of the insulating sheath of the transmission cable and the joint of the transmission cable and the overhead line; the main control module of the second monitoring unit receives the grounding current information sent by the first monitoring unit and sends the fault section, the grounding current information and the line current information to the monitoring background; and the monitoring background receives the information transmitted by the second monitoring unit and sends the information to the appointed mobile terminal. The utility model discloses location trouble interval that can be accurate to carry out fault location fast, can reduce the manpower of consumption on the one hand, alleviate the line burden of patrolling, on the other hand can accelerate the speed that the circuit resumes the power supply again, reduces the economic loss because of having a power failure and causing.
Description
Technical Field
The utility model relates to a transmission line trouble field especially relates to an adopt trouble interval positioner of loRa mode communication.
Background
With the rapid development of power systems, the power transmission line develops a cable-overhead line hybrid power transmission line on the basis of the original cable and overhead power transmission line, and the application is more and more extensive. The ultra-high voltage cable-overhead line hybrid line can span large water channels and straits and can directly supply power to centers of large cities and industrial areas. Meanwhile, due to the limitation of urban space and planning, the cable-overhead hybrid line is more and more widely applied in cities. The cable-overhead line hybrid line is also applied to low-current power transmission systems with neutral points not directly grounded, such as railway signal power supply systems.
However, due to manufacturing defects or use over time, the insulation level of the power transmission cable in the cable-overhead line may decrease, thereby causing a ground fault in the cable, and likewise, a fault in the overhead line. In daily life and work, whether the cable-overhead line can quickly determine a fault section after a fault so as to recover power supply is often related to whether the daily life and work of people can be carried out in order.
In the prior art, the method for determining the fault section is usually manual line patrol, the method consumes a large amount of manpower, the line patrol burden of maintenance personnel is easily increased, the fault section cannot be determined quickly, the speed of line power restoration is low, and a large amount of economic loss is caused.
SUMMERY OF THE UTILITY MODEL
In order to overcome prior art's not enough, the utility model provides an adopt fault interval positioner of loRa mode communication, location fault interval that can be accurate to carry out fault location fast, can reduce the manpower of consumption on the one hand, alleviate the burden of patrolling the line, on the other hand can accelerate the speed that the circuit resumes the power supply again, reduces the economic loss because of having a power failure and causing.
In order to solve the above problem, the utility model discloses a technical scheme do: a fault interval positioning device adopting LoRa communication is characterized in that a mixed line is a cable-overhead line, one end of a transmission cable of the cable-overhead line is directly grounded, the other end of the transmission cable is arranged on a transmission tower and is protected and grounded, the fault interval positioning device comprises a monitoring unit and a monitoring background, and the monitoring unit is connected with the monitoring background;
the monitoring unit comprises a first monitoring unit and a second monitoring unit, the first monitoring unit is in communication connection with the second monitoring unit in an LoRa mode, the first monitoring unit and the second monitoring unit are respectively connected with a direct grounding end of an insulating sheath of the power transmission cable and a joint of the power transmission cable and an overhead line, and grounding current information of the insulating sheath of the power transmission cable and line current information of the overhead line are respectively obtained through the first monitoring unit and the second monitoring unit;
the second monitoring unit comprises a main control module, the main control module receives the grounding current information sent by the first monitoring unit, determines a fault interval according to the grounding current information and the line current information, and sends the fault interval, the grounding current information and the line current information to a monitoring background;
and the monitoring background receives the information transmitted by the second monitoring unit, identifies and displays the information of the fault point, the fault type and the fault interval according to the information, and sends the information to the appointed mobile terminal.
Further, the monitoring unit comprises a sensor, the sensor comprises a first current sensor and a second current sensor, the first monitoring unit is connected with the grounding end of the insulating sheath of the transmission cable through the first current sensor, the second monitoring unit is connected with the joint of the transmission cable and the overhead line through the second current sensor, and the insulating sheath grounding current of the transmission cable and the line current of the overhead line are respectively obtained through the first current sensor and the second current sensor.
Further, the first monitoring unit and the second monitoring unit respectively comprise a power supply module, an acquisition module, a main control module and a communication module, the main control module is respectively connected with the power supply module, the acquisition module and the communication module, the main control module and the acquisition module pass through the power supply module to acquire working current, and the main control module passes through the communication module to realize communication between the first monitoring unit and the second monitoring unit.
Furthermore, the power supply module comprises a current sensing power supply, a power management chip and a super capacitor, the power management circuit is respectively connected with the current sensing power supply and the super capacitor, the current sensing power supply is arranged on the cable-overhead line, and the power management circuit transmits the current output by the current sensing power supply and stores the current through the super capacitor so as to supply power to the monitoring unit through the super capacitor.
Furthermore, the power supply module further comprises a solar panel and a solar charging management chip, wherein the solar charging management chip is respectively connected with the super capacitor and the solar panel, and the current output by the solar panel is transmitted to the super capacitor through the solar charging management chip.
Furthermore, the acquisition module of the first monitoring unit comprises a first analog-to-digital converter, the first analog-to-digital converter is respectively connected with the first current sensor and the main control module, and the main control module acquires grounding current information of the transmission cable insulation sheath sent by the first current sensor through the first analog-to-digital converter.
Furthermore, the acquisition module of the second monitoring unit comprises a second analog-to-digital converter, a third analog-to-digital converter and an FPGA, the second analog-to-digital converter and the third analog-to-digital converter are connected with the second current sensor, and the FPGA acquires the line current and the fault traveling wave through the second analog-to-digital converter and the third analog-to-digital converter respectively.
Further, the main control module of the second monitoring unit comprises a main control chip, the main control chip adopts a Cortex-A9 framework, and the main control chip is a single chip microcomputer.
Furthermore, the communication module of the second monitoring unit comprises a 4G communication component, and the main control module of the second monitoring unit is connected with the monitoring background through the 4G communication component.
Further, the first monitoring unit and the second monitoring unit synchronize clocks through a GPS.
Compared with the prior art, the beneficial effects of the utility model reside in that: set up the current information that first monitoring unit and second monitoring unit gathered transmission cable and overhead line on cable-overhead line, send the current information who gathers for the control backstage with discernment trouble interval through the second monitoring unit, the utility model discloses location trouble interval that can be accurate to carry out fault location fast, can reduce the manpower of consumption on the one hand, alleviate and patrol the line burden, on the other hand can accelerate the speed that the line resumes the power supply again, reduces the economic loss because of having a power failure and causing.
Drawings
Fig. 1 is a structural diagram of an embodiment of the fault interval positioning device using the LoRa communication method of the present invention;
fig. 2 is a device connection diagram of an embodiment of the fault interval positioning device using LoRa communication;
fig. 3 is a structural diagram of an embodiment of a power supply module in the fault area positioning device using LoRa communication;
fig. 4 is a structural diagram of an embodiment of a first monitoring unit in the fault area positioning device using the LoRa communication method of the present invention;
fig. 5 is a structural diagram of an embodiment of an acquisition module of a second monitoring unit in the fault area positioning device adopting the LoRa communication mode;
fig. 6 is a structural diagram of an embodiment of a main control module of a second monitoring unit in a fault section of the hybrid circuit.
In the figure: 1. a sensor; 2. a power transmission cable; 3. a monitoring unit; 4. monitoring a background; 5. an overhead line; 31. a first monitoring unit; 32. a second monitoring unit; 11. a first current sensor; 12. a second current sensor; 301. a current sensing power supply; 302. a power management chip; 303. a super capacitor; 304. a solar panel; 305. a solar charging management chip; 306. a first analog-to-digital converter; 307. a second analog-to-digital converter; 308. an FPGA; 309. a third analog-to-digital converter; 310. a main control chip; 312. a power management component; 311. a storage component; 313. an expert diagnostic repository; 314. a GPS synchronization component.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that the embodiments or technical features described below can be arbitrarily combined to form a new embodiment without conflict.
Referring to fig. 1-6, fig. 1 is a structural diagram of an embodiment of a fault interval positioning device using LoRa communication according to the present invention; fig. 2 is a device connection diagram of an embodiment of the fault interval positioning device using LoRa communication; fig. 3 is a structural diagram of an embodiment of a power supply module in the fault area positioning device using LoRa communication; fig. 4 is a structural diagram of an embodiment of a first monitoring unit in the fault area positioning device using the LoRa communication method of the present invention; fig. 5 is a structural diagram of an embodiment of a second monitoring unit in the fault area positioning device using the LoRa communication; fig. 6 is a structural diagram of an embodiment of a main control module of a second monitoring unit in a fault section of the hybrid circuit. The fault area locating device adopting the LoRa mode communication of the present invention will be described in detail with reference to fig. 1 to 6.
In this embodiment, the hybrid line is a cable-overhead line, one end of a transmission cable 2 of the cable-overhead line is directly grounded, the other end of the transmission cable is arranged on a transmission tower and is protected and grounded, the fault section positioning device comprises a monitoring unit 3 and a monitoring background 4, and the monitoring unit 3 is connected with the monitoring background 4; the monitoring unit comprises a first monitoring unit 31 and a second monitoring unit 32, the first monitoring unit 31 and the second monitoring unit 32 are in communication connection in a LoRa mode, the first monitoring unit 31 and the second monitoring unit 32 are respectively connected with a direct grounding end of an insulating sheath of the power transmission cable 2 and a joint of the power transmission cable 2 and the overhead line 5, and grounding current information of the insulating sheath of the power transmission cable 2 and line current information of the overhead line 5 are respectively acquired through the first monitoring unit 31 and the second monitoring unit 32; the second monitoring unit 32 comprises a main control module, the main control module receives the grounding current information sent by the first monitoring unit 31, determines a fault section and a fault type according to the grounding current information and the line current information, and sends the fault section, the grounding current information and the line current information to the monitoring background 4; the monitoring background 4 receives the information transmitted by the second monitoring unit 32, identifies and displays the information of the fault point, the fault type and the fault section according to the information, and sends the information to the specified mobile terminal.
In this embodiment, the monitoring unit 3 may determine that the line fault occurs on the side of the power transmission cable 2 or the side of the overhead line 5 by using methods such as an expert library algorithm, a current variation curve, a traveling wave positioning algorithm, and a partial discharge positioning algorithm, so as to determine a fault section.
In this embodiment, the monitoring background 4 performs fault location according to the time when the reflected signal generated when the fault occurs reaches the first monitoring unit 31 and the second monitoring unit 32 and the propagation speed of the reflected signal in the line.
In this embodiment, the monitoring unit 3 obtains the grounding current information of the insulating sheath of the power transmission cable 2 and the line current information of the overhead line 5 through the sensor 1, wherein the sensor 1 may be respectively disposed on the first monitoring unit 31 and the second monitoring unit 32, or may be disposed on the cable-overhead line independently of the monitoring unit 3, as long as the grounding current information and the line current information can be obtained.
In this embodiment, the sensor 1 includes a first current sensor 11 and a second current sensor 12, the first current sensor 11 and the second current sensor 12 are respectively connected to the ground end of the insulating sheath at the end of the power transmission cable 2 directly grounded and the connection between the protective ground end of the power transmission cable 2 and the overhead wire, and the sensor 1 respectively obtains the ground current of the insulating sheath of the power transmission cable 2 and the wire current of the overhead wire 5 through the first current sensor 11 and the second current sensor 12.
In a specific embodiment, the first current sensor 11 and the second current sensor 12 are respectively installed on the ground wire of the insulating sheath of each phase of the power transmission cable 2 and the circuit of each phase of the power transmission cable 2, the first current sensor 11 and the second current sensor 12 are adaptive to the magnitude of the circuit load current, and synchronously acquire the circuit load current of the overhead line 5 and the ground current of the insulating sheath of the power transmission cable 2, single-phase ground fault characteristic data, fault traveling wave and map information when a circuit fault occurs, and send the information to the monitoring unit 3. The information such as short circuit, grounding, high temperature and battery voltage acquired by the sensor 1 is uploaded to the monitoring background 4 through the monitoring unit 3, and SOE recording is carried out to support fault recording. The sensor 1 and the monitoring background 4 support an internal communication protocol, and a user can remotely check and modify related parameters of the sensor 1 and remotely upgrade the sensor 1 through the monitoring background 4 so as to facilitate remote maintenance.
In a specific embodiment, the first current sensor 11 is a grounded current transformer and the second current sensor 12 is a high frequency rogowski coil. In other embodiments, the first sensor 11 and the second sensor 12 may also be an open-close type current sensor or other current transformers capable of acquiring current information of the power transmission line, and are not limited herein.
In this embodiment, the first monitoring unit 31 and the second monitoring unit 32 both include a power supply module, an acquisition module, a main control module and a communication module, the main control module is respectively connected with the power supply module, the acquisition module and the communication module, the main control module and the acquisition module acquire a working current through the power supply module, and the main control module realizes communication between the first monitoring unit 31 and the second monitoring unit 32 through the communication module.
In this embodiment, the communication module includes a Lora communication component, and the first monitoring unit 32 communicates with the second monitoring unit 32 in an Lora manner.
In other embodiments, the first monitoring unit 31 and the second monitoring unit 32 may also communicate with each other through WiFi, bluetooth, 5G, internet, and the like, which is not limited herein.
In this embodiment, the power supply module uses a small current (5A) to obtain power, wherein the power supply module includes a current sensing power supply 301, a power management chip 302 and a super capacitor 303, the power management chip 302 is respectively connected with the current sensing power supply 301 and the super capacitor 303, the current sensing power supply 301 is disposed on a cable-overhead line, and the power management chip 302 transmits a current output by the current sensing power supply 301 to the super capacitor 303 and stores the current in the super capacitor 303, so as to supply power to the monitoring unit 3 through the super capacitor 303.
In the present embodiment, the current sensing power supply 301 is clamped on the power transmission cable 2 or the overhead line 5, and obtains current from the power transmission cable 2 or the overhead line 5 by means of induction power taking, so that interference caused by the need to provide a power supply line for the monitoring unit 3 is avoided.
In other embodiments, the super capacitor 303 may be replaced by a lithium battery or other rechargeable batteries, which only needs to store current and supply power to the monitoring unit 3, and is not limited herein.
In a specific embodiment, the model of the power management chip 302 is BQ33100, and the super capacitor 303 is monitored and managed by the power management chip 302, in other embodiments, the power management chip 302 may also be another chip for managing the super capacitor 303, which is not limited herein.
In this embodiment, the power supply module further includes a solar panel 304 and a solar charging management chip 305, the solar charging management chip 305 is respectively connected to the super capacitor 303 and the solar panel 304, and the current output by the solar panel 304 is transmitted to the super capacitor 303 through the solar charging management chip 305.
In a specific embodiment, the solar charging management chip 305 is a model CN3722, and converts the current output by the solar panel 304 into a current capable of charging the super capacitor 303.
In other embodiments, the solar charging management chip 305 may be of another type, and a current conversion circuit having a similar function to the solar charging management chip may be used to replace the solar charging management chip, as long as the current output by the solar panel 304 can be stored in the super capacitor 303, which is not limited herein.
In other embodiments, the power supply module may further include a wind power generator, a thermal power generation device, and other devices capable of generating power using natural energy.
In this embodiment, the acquisition module of the first monitoring unit 31 includes a first analog-to-digital converter 306, the first analog-to-digital converter 306 is connected to the first current sensor and the main control module of the first monitoring unit 31, and the main control module of the first monitoring unit 31 acquires the ground current information of the insulating sheath of the power transmission cable 2 sent by the first current sensor 11 through the first analog-to-digital converter 306, and sends the ground current information to the second monitoring unit 32 through the communication module.
In this embodiment, the second monitoring unit 32 may further send an instruction for acquiring the ground current waveform diagram to the first monitoring unit 31 through the communication module thereof to control the first monitoring unit 31 to acquire the ground current waveform diagram.
In a specific embodiment, the model of the first analog-to-digital converter 306 is AD7606, and the main control module of the first monitoring unit 31 is a single chip microcomputer, and the model thereof is STM32L 51.
In this embodiment, the first analog-to-digital converter 306 and the main control module of the first monitoring unit 31 may be independently arranged, and in other embodiments, the first analog-to-digital converter 306 and the main control module may also be collectively arranged in the same chip or integrated circuit.
In this embodiment, the acquisition module of the second monitoring unit 32 includes a second analog-to-digital converter 307, a third analog-to-digital converter 309, and an FPGA (Field Programmable Gate Array) 308, where the second analog-to-digital converter 307 and the third analog-to-digital converter 309 are connected to the second current sensor 12, and the FPGA308 acquires the line current and the fault traveling wave through the second analog-to-digital converter 307 and the third analog-to-digital converter 309, respectively.
In the present embodiment, the number of the second current sensors 12 is 2, and the second analog-to-digital converter 307 and the third analog-to-digital converter 309 are connected to different second current sensors 12 to collect the line current and the fault traveling wave, respectively.
In other embodiments, the second analog-to-digital converter 307 and the third analog-to-digital converter 309 may also be connected to the second current sensor 12 and the first current sensor 11, respectively, or both may be connected to the same second current sensor 12, and only the line current and the fault traveling wave need to be collected, which is not limited herein.
The FPGA309 synchronously acquires the line current and fault traveling wave of each phase of the overhead line 5 through the second analog-to-digital converter 307 and the third analog-to-digital converter 309.
In a specific embodiment, the second analog-to-digital converter 307 has a model AD7606, the third analog-to-digital converter 309 has a model LTC2325, and the FPGA309 has a model EP4CE 22.
In this embodiment, the main control module of the second monitoring unit 32 includes a main control chip 310, a storage component 311, an expert diagnosis library 313 and a power management component 312. The main control module adopts a Cortex-A9 framework, the main control chip 310 is a single chip microcomputer, the main control chip 310 collects current information sent by the first monitoring unit 31 and the FPGA308, the operation condition of the power transmission line is analyzed according to the change of a current signal in the current information, when the overhead line 5 is judged to have a current fault, fault traveling wave and current waveform information are collected through the FPGA308, and the collected information is sent to the monitoring background 4.
In this embodiment, the storage component 311 may be a hard disk, an SD card, a memory bank, or other storage devices capable of storing information, and the expert diagnosis library 313 stores therein an algorithm and a current waveform change library for performing fault diagnosis on the cable-overhead line, and analyzes the current information transmitted by the sensor 1 according to the algorithm and the current waveform change library to determine a fault section of the line.
In the present embodiment, the first monitoring unit 31 and the second monitoring unit 32 further include a GPS synchronization component 314, and the GPS synchronization component 314 acquires a GPS clock signal to keep the time of the first monitoring unit 31 and the time of the second monitoring unit 32 consistent.
In this embodiment, the communication module of the second monitoring unit 32 further includes a 4G communication component, and the main control module of the second monitoring unit 32 is connected to the monitoring background through the 4G communication component. In other embodiments, the second monitoring unit 32 may further include bluetooth, WiFi, 5G and other communication components, and only the second monitoring unit 32 can implement information interaction with the monitoring background, which is not limited herein.
In the above embodiment, the GPS synchronization component 314, the storage component 311, the expert diagnosis library 313 and the power management component 312 may be integrated in the main control chip 310 or partially combined in a device other than the main control chip 310, which is not limited herein.
In this embodiment, the monitoring background 4 is a background server, and the background server collects and integrates information sent by the monitoring unit 3, thereby performing research and judgment on a fault point, a fault type, and a fault section of the cable-overhead line. And the information and the result are displayed or sent to a display terminal connected with the information and the result through a web interface. Meanwhile, the background server can be also associated with the mobile terminal, and sends current change information or fault section information of the cable-overhead line to the mobile terminal according to a preset rule or sends alarm information to the mobile terminal when a fault occurs.
In this embodiment, the monitoring background 4 has a storage system and a diagnosis library, and realizes information collection and comprehensive information judgment through the storage system and the diagnosis library, and the monitoring background 4 can also perform information configuration, account allocation and account management on the monitoring unit 3 and the sensor 1 connected thereto, and also perform information configuration and account management on a mobile terminal associated therewith.
The utility model discloses a monitoring unit 3's power module has built-in large capacity, long-life lithium subcell or super capacitor 303. By applying the lithium sub-battery or the super capacitor 303, the visible line power supply module continuously gets power within the range of 5-600A of line current, the current of the power transmission line can meet the minimum requirements of self-supply operation and power storage only by reaching 5A, and a battery or an external power supply is not needed, so that the service life of a product is effectively prolonged.
The acquisition module adopts a 24-bit high-precision analog-to-digital converter with differential input, calculates the current value through the FFT (fast Fourier transform) of 1024 points, and the FFT (fast Fourier transform) algorithm is a fixed formula algorithm, can sleeve the numerical value acquired by the analog-to-digital converter of 1024 points to directly calculate the current effective value, and improves the acquisition precision.
The specific analysis mode of the monitoring background for analyzing the fault point is as follows: knowing the transmission rate of the electromagnetic wave, the monitoring background 4 calculates the fault point by capturing the time difference between the incident wave and the reflected wave of the fault traveling wave and the arrival time of the reflected wave at the acquisition module (incident wave time T1, amplitude V1, reflected wave time T2 and amplitude V2, the conduction rate of the electromagnetic wave on the line is 17 m/us and the attenuation is a fixed value, whether the reflected wave is the reflected wave at the end point or the reflected wave at the fault point is determined through V1-V2, and the position of the fault point is calculated through T1-T2.
The incident wave time T1, the intensity V1, the time T3 of reaching the end point and the amplitude V3 can be collected by the collecting modules of the first monitoring unit and the second monitoring unit at two ends, the time T2 of the reflected wave of the fault point reaching the generating device and the intensity V2 can obtain the time us of the position S of the fault point (T2-T1) 17/2T, and the distance unit is meter.
The first monitoring unit 31 and the second monitoring unit 32 obtain a GPS high precision (1us) time service through the GPS synchronization component 314 to obtain a precise absolute time scale, so as to keep the time of the two units consistent. The main control module of the first monitoring unit 31 and the main control module of the second monitoring unit 32 wirelessly synchronize the sensor 1 with each other for a time every 30 minutes to ensure that the time corresponding to each phase of current information acquired by the sensor 1 is kept the same and maintained at the same precision, thereby realizing the acquisition of the three-phase current and the ground electric field waveform of the power transmission cable 2.
The utility model discloses a sensor 1 and monitoring unit 3 set up can independently move after on cable-overhead line, and the design of maintenance-free completely. If necessary, the monitoring background 4 can be used for remotely and wirelessly maintaining the operating parameters of the monitoring background, updating fault criteria or upgrading software programs, and the working efficiency is improved.
Compared with the prior art, the utility model discloses a fault interval positioner of loRa mode communication's beneficial effect lies in: set up the current information that first monitoring unit and second monitoring unit gathered transmission cable and overhead line on cable-overhead line, send the current information who gathers for the control backstage with discernment trouble interval through the second monitoring unit, the utility model discloses location trouble interval that can be accurate to carry out fault location fast, can reduce the manpower of consumption on the one hand, alleviate and patrol the line burden, on the other hand can accelerate the speed that the line resumes the power supply again, reduces the economic loss because of having a power failure and causing.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are all within the protection scope of the present invention.
Claims (10)
1. The fault interval positioning device is characterized by being applied to a hybrid line, the hybrid line is a cable-overhead line, one end of a transmission cable of the cable-overhead line is directly grounded, the other end of the transmission cable is arranged on a transmission tower and is protected and grounded, the fault interval positioning device comprises a monitoring unit and a monitoring background, and the monitoring unit is connected with the monitoring background;
the monitoring unit comprises a first monitoring unit and a second monitoring unit, the first monitoring unit is in communication connection with the second monitoring unit in an LoRa mode, the first monitoring unit and the second monitoring unit are respectively connected with a direct grounding end of an insulating sheath of the power transmission cable and a joint of the power transmission cable and an overhead line, and grounding current information of the insulating sheath of the power transmission cable and line current information of the overhead line are respectively obtained through the first monitoring unit and the second monitoring unit;
the second monitoring unit comprises a main control module, the main control module receives the grounding current information sent by the first monitoring unit, determines a fault interval according to the grounding current information and the line current information, and sends the fault interval, the grounding current information and the line current information to a monitoring background;
and the monitoring background receives the information transmitted by the second monitoring unit, identifies and displays the information of the fault point, the fault type and the fault interval according to the information, and sends the information to the appointed mobile terminal.
2. The LoRa communication fault area locating device of claim 1, wherein the monitoring unit includes a sensor, the sensor includes a first current sensor and a second current sensor, the first monitoring unit is connected to the ground end of the insulation sheath of the transmission cable of the first current sensor, the second monitoring unit is connected to the joint of the transmission cable and the overhead line through the second current sensor, and the insulation sheath ground current of the transmission cable and the line current of the overhead line are respectively obtained through the first current sensor and the second current sensor.
3. The LoRa communication fault interval positioning device of claim 2, wherein the first monitoring unit and the second monitoring unit each include a power supply module, an acquisition module, a main control module and a communication module, the main control module is connected to the power supply module, the acquisition module and the communication module, the main control module and the acquisition module obtain operating current through the power supply module, and the main control module realizes communication between the first monitoring unit and the second monitoring unit through the communication module.
4. The LoRa communication fault interval positioning device of claim 3, wherein the power supply module comprises a current sensing power supply, a power management chip and a super capacitor, the power management chip is respectively connected with the current sensing power supply and the super capacitor, the current sensing power supply is arranged on the cable-overhead line, and the power management chip transmits the current output by the current sensing power supply and stores the current through the super capacitor so as to supply power to the monitoring unit through the super capacitor.
5. The LoRa communication fault area locating device of claim 4, wherein the power supply module further comprises a solar panel and a solar charging management chip, the solar charging management chip is connected to the super capacitor and the solar panel, and the solar charging management chip transmits the current output by the solar panel to the super capacitor.
6. The LoRa communication fault interval positioning device of claim 3, wherein the acquisition module of the first monitoring unit comprises a first analog-to-digital converter, the first analog-to-digital converter is respectively connected with the first current sensor and the main control module, and the main control module acquires the grounding current information of the power transmission cable insulation sheath sent by the first current sensor through the first analog-to-digital converter.
7. The fault interval positioning device adopting LoRa mode communication as claimed in claim 4, wherein the acquisition module of the second monitoring unit includes a second analog-to-digital converter, a third analog-to-digital converter and an FPGA, the second analog-to-digital converter and the third analog-to-digital converter are connected to the second current sensor, and the FPGA acquires the line current and the fault traveling wave through the second analog-to-digital converter and the third analog-to-digital converter, respectively.
8. The LoRa communication fault interval positioning device of claim 3, wherein the second monitoring unit comprises a main control chip, the main control chip is of a Cortex-A9 structure, and the main control chip is a single chip microcomputer.
9. The LoRa communication fault interval positioning device of claim 3, wherein the communication module of the second monitoring unit comprises a 4G communication component, and the main control module of the second monitoring unit is connected with the monitoring background through the 4G communication component.
10. The LoRa communication fault area locating device of claim 1, wherein the first and second monitoring units synchronize clocks via GPS.
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| CN201921666341.7U CN212723166U (en) | 2019-09-30 | 2019-09-30 | Fault interval positioning device adopting LoRa mode communication |
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| CN201921666341.7U CN212723166U (en) | 2019-09-30 | 2019-09-30 | Fault interval positioning device adopting LoRa mode communication |
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