CN209280835U - Novel high-precision synchronous sampling high-resistance grounding fault indicator - Google Patents
Novel high-precision synchronous sampling high-resistance grounding fault indicator Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model discloses a novel high-accuracy synchronous sampling high resistance earth fault indicator, include: the three sensor units are used for transmitting three-phase current time temperature information of a fixed point of the high-voltage transmission line to the cloud server master station system after receiving an abnormal data calling instruction sent by the data collecting unit; the data collection unit is used for actively sending an abnormal data recall instruction to the sensor unit or sending an abnormal data recall instruction to the sensor unit when receiving a monitoring instruction sent by the master station system; and the monitoring unit is used for acquiring the zero sequence voltage abnormal signal and sending an abnormal data calling instruction to the data collection unit. The utility model has the advantages of low energy consumption, small volume, strong universality, compact structure, strong environmental adaptability, etc.; the fault information can be uniformly reported to the cloud server for analysis, so that the actual fault type and range of the power grid can be mastered, and the intelligent power grid is constructed to improve the fault detection and response capability.
Description
Technical field
The utility model relates to Power System Faults Detection system more particularly to a kind of novel high-precision synchronized sampling high resistants
Earth-fault indicator, for the sampling recording detection of smart grid high resistance earthing fault.
Background technique
Fault detection system is a kind of self recording apparatus to put into operation throughout the year, for monitoring the operation of electric system
Situation is called the black box of electric system and " electrocardiogram " of electric power netting safe running.When electric system is broken down, therefore
The data of barrier oscillograph record can be used for analyzing failure cause, monitoring relay protection and the operation of automatic safety device and observation
The entire course of fault progression is the important evidence for avoiding similar accident from occurring again.With the extension of electric power networks, complexity
Change and the development of regional grid interconnection, countries in the world are higher and higher to the detection requirement and its attention degree of electric system.
With the gradually development of smart grid, smart power grid fault detection system will supervise in real time in each region electric system
The relevant informations such as measuring point electric current, temperature, the running potential danger of discovery route, the operational safety for protecting electric system, this will
Help to improve smart grid reliability of operation.
35KV and following power distribution network are run by isolated neutral mode, and major advantage is when single-phase moment occurs for system
It, can be with self-extinguish electric arc when ground fault；When single-phase continuous earth occurs, load may not necessarily have a power failure immediately, therefore domestic
35KV and following power distribution network are most of all using this earthing mode.
As distribution line load quicklys increase the extensive use with cable run, power network neutral point effective grounding mode
More and more applied.Very big fault current will be generated when short trouble occurs for transmission line of electricity, to make protective device
It can action message excision failure.However for neutral point effective grounding distribution line, by power transmission corridor, insulator arc-over, lightning stroke,
Branch streaks the influence of the factors such as electric wire, is easy to happen arc light high resistance earthing fault.Different from short trouble, such fault current is prominent
Variable is small, and even zero, conventional overcurrent protection can not be detected reliably, it can seldom get recorded field data, and this
The presence of the not noticeable failure of kind may result in electric system and more serious failure occurs.
The Foreground background model tradition computer-based fault recorder generallyd use at present, background PC computer is by own mechanical intensity
Limitation, reliability is low, it is difficult to longtime running；Front end processor concentrates acquisition, calculating, the processing for carrying out data, and task is heavy.This is tight
Constrain again the application of conventional failure oscillograph with it is universal.
On the other hand, electric network fault analysis requires the temporal information of each microcomputer device to be accurate within 1ms in electric system,
It is then high that requirement of the grid phase measurement to clock accuracy reaches the requirement of delicate grade, travelling wave ranging and traveling-wave protection to clock accuracy
Up to 1 μ s, these all propose challenge to the design of fault detection system.
Utility model content
For being above one of technical problem, the utility model provides a kind of different from traditional computer-based fault recorder
Centralized configuration, a kind of distributed low-power consumption electric network fault oscillograph of lab design where this project.The electric network fault
Recording system is made of five modular intelligent measurement terminals, including a monitoring unit, a data collection unit and three
A sensor unit, three sensor units are separately mounted on the three-phase high-voltage power transmission line for needing to monitor.Sensor unit and
Data collection unit can independent self-powered, on-line monitoring record high voltage transmission line fixed point three-phase current and time-temperature
Etc. information, and collected data can be handled.Monitoring unit is directly powered by external power supply, is supervised in substation
Residual voltage is surveyed, monitors to pass through Lora interaction by collecting unit to unit sending abnormal data test introduction is collected when exception
Sensor unit, then abnormal data is uploaded onto the server by 4G network by sensor unit.
The technical solution of the utility model are as follows:
A kind of novel high-precision synchronized sampling high resistance earthing fault indicator, comprising:
Three sensor units, for when receive data collection unit transmission abnormal data test introduction after will be online
The three-phase current and time-temperature information of the high voltage transmission line fixed point of monitoring are transmitted to cloud server main station system；
Data collection unit, for active or when receiving the test introduction that the monitoring unit is sent, to the biography
Sensor cell sends abnormal data test introduction；
Monitoring unit is used for acquisition testing substation residual voltage, converges when finding residual voltage data exception to data
Collect unit and sends abnormal data test introduction.
Further, the sensor unit includes:
Conducting wire induction takes electricity and energy management circuit, for taken from three-phase wire electricity be 4G module and its peripheral circuit,
Real-time control signal wireless transmission unit, STM32 and its peripheral circuit power supply；
Current detecting and data acquisition circuit, for acquiring three-phase electricity electric current based on current mode mutual inductor；
Local data store, for storing sampled data；
GPS time service module and interface circuit, for exporting one-second burst signal, the second pulse signal is as sample count
Benchmark corrects timer clock of the voltage controlled crystal oscillator as the MCU of clock source, realizes High Precision Time Stamps, it is ensured that sampling is accurate same
Step；
STM32 and its peripheral circuit take electricity and energy management circuit, current detecting sum number by the induction of circuit connection conducting wire
According to Acquisition Circuit, local data store, GPS time service module and interface circuit, short range LED failure instruction, 4G module and its
Peripheral circuit, wireless transmission unit, the external active including STM32 single-chip microcontroller, the connection STM32 single-chip microcontroller as clock source
Voltage controlled crystal oscillator；
The instruction of short range LED failure, is used for indicating fault, can see locally；
4G module and its peripheral circuit, for carrying out data communication with cloud server, the high pressure for transmitting on-line monitoring is defeated
The three-phase current and time-temperature information of electric wire fixed point；
Wireless transmission unit for sensor unit and collects the real time communication between unit, and transmission abnormality data call survey together
Instruction.
Further, the wireless transmission unit includes LoRa module and its peripheral circuit, for sensor unit and
Collect the wireless real time communication between unit, transmission abnormality data test introduction.Further, the conducting wire induction takes electricity and energy
Buret reason circuit charges after taking electricity, voltage converted from three-phase wire to super capacitor, and being then converted into 3.8V is 4G module
And its peripheral circuit and the power supply of real-time control signal wireless transmission unit, while also convering into 3.3V and 5.0V is respectively STM32
The MCU power supply and the power supply of ADC Acquisition Circuit of single-chip microcontroller.
Further, the data collection unit includes:
STM32 and its peripheral circuit take electricity and energy management circuit, short range LED failure to refer to by circuit connection solar energy
Show, 4G module and its peripheral circuit, wireless transmission unit, including STM32 single-chip microcontroller, the connection STM32 single-chip microcontroller as when
The external active voltage controlled crystal oscillator of Zhong Yuan；
Solar energy takes electricity and energy management circuit, use solar energy take electricity and the common power supply mode of battery for STM32 and its
Peripheral circuit, 4G module and its peripheral circuit, the power supply of data test introduction wireless transmission unit.
The instruction of short range LED failure, is used for indicating fault, can see locally；
4G module and its peripheral circuit receive what the monitoring unit was sent for carrying out data communication with monitoring unit
Abnormal data test introduction；
Wireless transmission unit for sensor unit and collects the real time communication between unit, and transmission abnormality data call survey together
Instruction.
Further, the wireless transmission unit includes LoRa module and its peripheral circuit, for sensor unit and
Collect the wireless real time communication between unit, transmission abnormality data test introduction.
Further, the monitoring unit includes:
GPS time service module and interface circuit, for exporting one-second burst signal, the second pulse signal is as sample count
Benchmark corrects timer clock of the voltage controlled crystal oscillator as the MCU of clock source, realizes High Precision Time Stamps, it is ensured that sampling is accurate same
Step；
STM32 and its peripheral circuit, the outside including STM32 single-chip microcontroller, the connection STM32 single-chip microcontroller as clock source
Active voltage controlled crystal oscillator；
4G module and its peripheral circuit, for sending abnormal data test introduction to the data collection unit；
Local data store, for storing timestamp when residual voltage acquisition data, in case 4G transmission is called survey together and referred to
It enables to collecting unit；
Power circuit, for being the STM32 and its peripheral circuit, 4G module and its peripheral circuit, local datastore
Unit and GPS time service module and interface circuit power supply.
Residual voltage monitoring and data acquisition circuit acquire substation's residual voltage by ADC chip, and acquisition chip is main mould
Formula, MCU are slave pattern, information exchange are realized with SPI, using DMA mode storing data.
Further, the power circuit is designed as the MCU power supply that 12V turns 3.3V as STM32 single-chip microcontroller, and 12V turns 3.8V
It powers for 4G module and its peripheral circuit, 12V turns the ADC that 5V is STM32 single-chip microcontroller and powers.
Further, the external active voltage controlled crystal oscillator model TG5032CAN.
Further, the STM32 single-chip microcontroller uses STM32L4+ single-chip microcontroller, low in energy consumption, performance is high, speed is fast and deposits
Reserves are big.
Compared with prior art, the utility model has the following beneficial effects:
The modular electric network fault detection terminal of the utility model is with low energy consumption, small in size, versatile, structure is tight
It gathers, the remarkable advantages such as environmental suitability is strong.Furthermore data collection unit can lead to actively or under abnormal data test introduction
Know that sensor unit obtains fault information reporting to remote server, then by server to these fault messages progress comprehensive analysis
It is believable out as a result, to grasp power grid physical fault type and involve range, realize the collaborative work of human-computer interaction.
Meanwhile the utility model is according to global positioning system (GPS) clock signal and crystal oscillator clock signal precision complementary
Feature is realized high-precision using crystal oscillation signal as the clock source of MCU using the 1Hz signal that GPS clock calibration MCU timer generates
Timestamp to be spent, system is made to realize precise synchronization sampling to distribution cable each point, the clock accuracy of phase measurement reaches delicate grade, from
And more accurately realize fault detection and positioning.
Detailed description of the invention
Fig. 1 is the structure chart of the sensor unit of the utility model embodiment.
Fig. 2 is the structure chart of the convergence unit of the utility model embodiment.
Fig. 3 is the electrical substation monitoring cellular construction figure of the utility model embodiment.
Fig. 4 is the 4G network information communication scheme figure of the utility model embodiment.
Fig. 5 is the LoRa network connection diagram for collecting unit and sensor unit of the utility model embodiment.
Fig. 6 is the implementation flow chart of the high accurate clock signal of the utility model embodiment.
Specific embodiment
The utility model is further described in the following with reference to the drawings and specific embodiments.
A kind of novel high-precision synchronized sampling high resistance earthing fault indicator, comprising:
Three sensor units, for when receive data collection unit transmission abnormal data test introduction after will be online
The three-phase current and time-temperature information of the high voltage transmission line fixed point of monitoring are transmitted to cloud server main website；
Data collection unit, for active or when receiving the test introduction that the monitoring unit is sent, Xiang Suoshu
Sensor unit sends abnormal data test introduction；
Monitoring unit sends abnormal data to data collection unit when noting abnormalities for acquiring substation's residual voltage
Test introduction.
As shown in Figure 1, the sensor unit include STM32 and its peripheral circuit, GPS time service module and interface circuit,
The instruction of short range LED failure, 4G module and its peripheral circuit, LoRa module and its peripheral circuit, local datastore, current detecting
The modules such as electricity and energy management circuit composition is taken with data acquisition circuit, conducting wire induction.
Wherein:
The STM32 and its peripheral circuit are incuded by circuit connection conducting wire takes electricity and energy management circuit, current detecting
With data acquisition circuit, local data store, GPS time service module and interface circuit, the instruction of short range LED failure, 4G module
And its peripheral circuit, wireless transmission unit, the outside including STM32 single-chip microcontroller, the connection STM32 single-chip microcontroller as clock source
Active voltage controlled crystal oscillator；
The GPS time service module and interface circuit are used to correct the timer clock of MCU of the voltage controlled crystal oscillator as clock source,
Realize High Precision Time Stamps, it is ensured that sampling precise synchronization；
The short range LED failure instruction is used for indicating fault, and brightness is lower, can see locally；
The 4G module and its peripheral circuit are used for and the monitoring server of central control room carries out data communication；
The LoRa module and its peripheral circuit for sensor unit and collect the communication between unit, transmission abnormality number
According to test introduction, LoRa is configured to low-power consumption mode, and real-time Transmission while guarantees low-power consumption；
The local datastore is for storing sampled data；
The current detecting and data acquisition circuit select a 1A to turn the current mode mutual inductance of voltage for acquiring electric current
Device；
The conducting wire induction takes electricity and energy management circuit for taking electricity from three-phase wire, to super after voltage is converted
Capacitor charging, being then converted into 3.8V is that 4G module and its peripheral circuit and real-time control signal wireless transmission unit are powered, together
When also convert into 3.3V and 5.0V be respectively STM32 single-chip microcontroller MCU power supply and ADC Acquisition Circuit power supply.
Detailed description are as follows for the sensor unit specific embodiment:
The first step, initialization hardware device.
After the conducting wire induction takes electricity and energy management circuit work, hardware platform is powered on, and initializes serial ports and subsystem
Hardware platform.Hardware platform is based on STM32L4+, uses external voltage controlled crystal oscillator as MCU clock source, the external active is voltage-controlled
Crystal oscillator model TG5032CAN.Serial ports 1,2,3 and low-power consumption serial ports 1 are initialized respectively, serial ports 1 is used to read the data of GPS,
Serial ports 2, which is used to connect the port MAX232, to carry out computer debugging or reads data, and serial ports 3 is used to read and send the number of 4G chip
According to low-power consumption serial ports 1 is used to read and send the data of LoRa module.SPI port and each port and biography are finally carried out respectively
The initialization of sensor configuration.
Second step, GPS timing synchronization sytem time.
GPS module is not always on, MCU time opening GPS module, is had using the second pulse signal of GPS, and locally
The MCU timer clock synchronization of source voltage controlled crystal oscillator frequency dividing, according to the Frequency Dividing Factor of clock synchronization error transfer factor timer, by repeatedly recycling repeatedly
Generation control, finally realizes High Precision Time Stamps, it is ensured that sampling precise synchronization has corrected closing GPS module.
Third step reads power grid three-phase current and judges whether zero-sequence current exception occurs.
Zero-sequence current is converted into suitable voltage first, is added in ADC acquisition input terminal, ADC chip is holotype, MCU
For slave pattern, signal communication is realized with SPI, is saved the data in using dma mode in the buffer area of an internal Flash.Electricity
The acquisition of signal is pressed to acquire by 12.8KHz, i.e., the 12.8K data of acquisition in one second, each data are 2 bytes.One sine wave is
20ms, 256 data of a wave occupy 512 bytes, specifically include:
Step 1: internal Flash divides 512 byte buffer storing datas；
Step 2: setting half Transmission of DMA and the end of transmission are interrupted；
Step 3: when starting acquisition, moment T1 in fact is recorded, when transmitting i.e. 256 byte of half, logging timestamp T2, at this time
Acquire 128 data；
Step 4: 128 data of step 3 being handled, judge whether residual voltage is abnormal；
Step 5: if there is abnormal generation in step 4, corresponding timestamp being recorded, and by the acquisition information at the moment
It is stored in internal Flash, while opening 4G work, send instructions to the main website server of fault recording system；
Step 6: data exception judgement is equally carried out when the end of transmission；
Step 7: repeating step 3 and arrive step 6
4th step receives abnormal data test introduction
The LoRa module of sensor unit receives the data test introduction from data collection unit, and MCU is from signal
It reads abnormal time of origin and reads the acquisition data of corresponding time from local data storage module, while opening 4G module work
Make, send data to the main website server of fault recording system, closes 4G module after the completion.
5th step, LED failure are shown.
As shown in Fig. 2, collecting unit includes STM32 and its peripheral circuit, remote LED indicating fault, 4G module and its outer
It encloses circuit, LoRa module and its peripheral circuit, solar energy and takes electricity and energy management circuit.
The STM32 and its peripheral circuit take electricity and energy management circuit, short range LED failure by circuit connection solar energy
Instruction, 4G module and its peripheral circuit, wireless transmission unit, including STM32 single-chip microcontroller, the connection STM32 single-chip microcontroller conduct
The external active voltage controlled crystal oscillator of clock source；
The remote LED indicating fault is used for indicating fault, the short range LED failure instruction one of function and sensor unit
Sample, but brightness is bigger, long transmission distance；
The 4G module and its peripheral circuit are used for and monitoring unit carries out data communication, are received the monitoring unit and are sent
Abnormal data test introduction；
The LoRa module and its peripheral circuit for sensor unit and collect the wireless real time communication between unit, pass
Defeated abnormal data test introduction.
The solar energy takes electricity and energy management circuit for powering, and collects unit and takes electricity and battery common using solar energy
Power supply, energy is sufficient, and generating 3.8V through energy management circuit is 4G module and LoRa module for power supply, while also convering into 3.3V and being
MCU power supply.
It is described to collect unit specific embodiment detailed description are as follows:
The first step, initialization hardware device.
After solar energy takes electricity and energy management circuit work, hardware platform is powered on, and initializes serial ports and subsystem hardware is flat
Platform.Hardware platform is based on STM32L4+, uses external active voltage controlled crystal oscillator as the clock source of MCU, the external active is voltage-controlled
Crystal oscillator model TG5032CAN.Serial ports 1 or low-power consumption serial ports 1, serial ports 2, serial ports 3 are initialized respectively, and serial ports 2 is used to connect
The port MAX232 carries out computer debugging or reads data, and serial ports 3 is used to read and send the data of 4G chip, serial ports 1 or
Low-power consumption serial ports 1 is used to read and send the data of LoRa module.Finally carry out respectively each port and sensor configuration just
Beginningization.
Second step, the 4G module for collecting unit are always maintained at open state after initialization is complete, can receive monitoring
Then the 4G abnormal data test introduction of unit sends abnormal data test introduction to sensor unit by LoRa module.
As shown in figure 3, the monitoring unit includes GPS time service module and interface circuit, STM32 and its peripheral circuit, 4G
The modules such as module and its peripheral circuit, local data store, residual voltage monitoring and data acquisition circuit, power circuit.
The GPS time service module and interface circuit are for exporting one-second burst signal, and the second pulse signal is as sampling
Baseline corrects timer clock of the voltage controlled crystal oscillator as the MCU of clock source, realizes High Precision Time Stamps, it is ensured that sampling essence
It is really synchronous；
The STM32 and its peripheral circuit include STM32 single-chip microcontroller, the connection STM32 single-chip microcontroller as clock source
External active voltage controlled crystal oscillator；
The 4G module and its peripheral circuit are used to send abnormal data test introduction to the data collection unit；
The local data store is used for the timestamp information etc. when storing zero sequence voltage detection exception；
Residual voltage monitoring and data acquisition circuit, by ADC chip acquisition testing residual voltage, based on acquisition chip
Mode, MCU are slave pattern, information exchange are realized with SPI, using DMA mode storing data.
Power circuit: for being the STM32 and its peripheral circuit, 4G module and its peripheral circuit, local datastore
Unit and GPS time service module and interface circuit power supply, the specific 12V that designs turn 3.3V for MCU power supply, and 12V turns 3.8V for 4G module
Power supply, 12V turn 5V and power for ADC.
Detailed description are as follows for the specific embodiment of the monitoring unit:
The first step, hardware design
All STM32L4+ chips all use external active voltage controlled crystal oscillator as clock source.
Second step, initialization hardware device.
Hardware platform is powered on, serial ports and subsystem hardware platform are initialized.Hardware platform is based on STM32L4+, matches first
System clock is set, external voltage controlled crystal oscillator is used to input as the bypass mode of HSE.Serial ports 1,2,3 is initialized respectively, and serial ports 1 is used
Read the information of GPS, serial ports 2, which is used to connect the port MAX232, to carry out computer debugging or read data, serial ports 3 is used to read
The information of 4G chip.The initialization of SPI port and remaining each port and sensor configuration is finally carried out respectively.
Third step, GPS timing synchronization sytem time.
GPS module is not always on, MCU time opening GPS module, is had using the second pulse signal of GPS, and locally
The MCU timer clock synchronization of source voltage controlled crystal oscillator frequency dividing, according to the Frequency Dividing Factor of clock synchronization error transfer factor timer, by repeatedly recycling repeatedly
Generation control, finally realizes High Precision Time Stamps, it is ensured that sampling is accurate, has corrected closing GPS module.
4th step, detection simultaneously judge whether substation's residual voltage exception occurs.
Residual voltage is converted into suitable voltage first, is added in ADC input terminal, ADC chip is holotype, MCU be from
Mode is realized information connection with SPI, is saved the data in a buffer area of internal Flash by the way of DMA.Voltage
Signal presses 12.8KHz frequency collection, i.e., the 12.8K data of acquisition in one second, and each data are 2 bytes.One sine wave is 20ms,
One wave, 256 data occupy 512 bytes.
Step 1: internal Flash divides 512 byte buffer storing datas；
Step 2: setting half Transmission of DMA and the end of transmission are interrupted；
Step 3: when starting acquisition, moment T1 in fact is recorded, when transmitting i.e. 256 byte of half, logging timestamp T2, at this time
Acquire 128 data；
Step 4: 128 data of step 3 being handled, judge whether residual voltage is abnormal；
Step 5: if there is abnormal generation in step 4, corresponding timestamp being recorded, an abnormal data is formed and calls survey together
Instruction.Instruction is stored in internal Flash, while opening 4G work, test introduction is sent to and collects unit；
Step 6: data exception judgement is equally carried out when the end of transmission；
Step 7: repeating step 3 and arrive step 6.
Step is realized below with reference to High Precision Time Stamps in Fig. 6 analytic explanation the utility model:
The input of the first step, the clock signal of external active crystal oscillator as the high speed outer clock HSE of STM32L4+ chip,
HSE uses by-pass mode；Second step, MCU timer internal TIM carry out clock division, and the clock signal after frequency dividing is as core
The input of the low speed external clock LSE of piece, LSE use by-pass mode；Clock source after third step, LSE frequency dividing as RTC,
Generate date Hour Minute Second signal；The clock source of chip interior low-power consumption timer LPTIM is also selected as LSE, carries out clock division
To generate the signal of 1Hz；4th step, using GPS pulse per second (PPS) clock signal read MCU inside low-power consumption counter generate
1Hz clock signal simultaneously records, and when next pulse per second (PPS) reads count value again, it is compared with calculated value, obtains current 1Hz
The frequency error of signal adjusts Frequency Dividing Factor according to current frequency error, iterates until 1Hz signal is accurate；
5th step, by internal counter to the 1Hz signal-count after correction, the output of counter is the submicrosecond grade time,
It is finally combined with the third step RTC signal generated, realizes High Precision Time Stamps.
The utility model provides a kind of combine detection system based on high-performance low-power-consumption STM32L4+, for intelligence electricity
Net high resistance earthing fault sample recording detection, more particularly, in combined system each unit device split-second precision information it is accurate
It realizes, the clock accuracy of grid phase measurement, which can achieve Microsecond grade and modular electric network fault detection terminal, has function
Consume the features such as low, small in size, versatile, compact-sized, the lead time is short, environmental suitability is strong.
The above embodiments of the present invention is used for the purpose of clearly demonstrating examples for clearly illustrating the present invention, and is not
It is limitations of the embodiments of the present invention.For those of ordinary skill in the art, in above explained base
It can also be made other variations or changes in different ways on plinth, there is no need and unable to give thoroughly all embodiments
It lifts.Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention etc. should be included in this
Within the protection scope of utility model claims.
Claims (10)
1. a kind of novel high-precision synchronized sampling high resistance earthing fault indicator characterized by comprising
Three sensor units, for that will be monitored on-line after receiving the abnormal data test introduction of data collection unit transmission
The three-phase current of high voltage transmission line fixed point, time-temperature information be transmitted to cloud server main station system；
Data collection unit, for active or when receiving the Monitoring instruction that the main station system is sent, to the sensing
Device unit sends abnormal data test introduction；
Monitoring unit is used for acquisition testing substation residual voltage, when finding residual voltage data exception to tidal data recovering list
Member sends abnormal data test introduction.
2. novel high-precision synchronized sampling high resistance earthing fault indicator according to claim 1, which is characterized in that described
Sensor unit include:
Conducting wire induction takes electricity and energy management circuit, is 4G module and its peripheral circuit, in real time for taking electricity from three-phase wire
Control signal wireless transmission unit, STM32 and its peripheral circuit power supply；
Current detecting and data acquisition circuit, for the three-phase electricity current acquisition based on current mode mutual inductor；
Local data store, for storing sampled data；
GPS time service module and interface circuit, for exporting one-second burst signal, the second pulse signal is as sample count base
Standard corrects timer clock of the voltage controlled crystal oscillator as the MCU of clock source, realizes High Precision Time Stamps, it is ensured that sampling precise synchronization；
STM32 and its peripheral circuit take electricity and energy management circuit, current detecting and data to adopt by the induction of circuit connection conducting wire
Collector, local data store, GPS time service module and interface circuit, the instruction of short range LED failure, 4G module and its periphery
Circuit, wireless transmission unit, it is voltage-controlled as the external active of clock source including STM32 single-chip microcontroller, the connection STM32 single-chip microcontroller
Crystal oscillator；
The instruction of short range LED failure, is used for indicating fault, can see locally；
4G module and its peripheral circuit, for carrying out data communication with monitoring unit, the high voltage transmission line for transmitting on-line monitoring is solid
Three-phase voltage and electric current, the temperature information of fixed point；
Wireless transmission unit for sensor unit and collects the real time communication between unit, transmission abnormality data test introduction.
3. novel high-precision synchronized sampling high resistance earthing fault indicator according to claim 2, which is characterized in that described
Wireless transmission unit include LoRa module and its peripheral circuit, for sensor unit and collect between unit it is wireless in real time
Communication, transmission abnormality data test introduction.
4. novel high-precision synchronized sampling high resistance earthing fault indicator according to claim 2, which is characterized in that described
Conducting wire induction is charged after taking electricity and energy management circuit to take electricity, voltage converted from three-phase wire to super capacitor, is then turned
Being changed to 3.8V is 4G module and its peripheral circuit and the power supply of real-time control signal wireless transmission unit, at the same also convert into 3.3V and
5.0V is respectively the MCU power supply and the power supply of ADC Acquisition Circuit of STM32 single-chip microcontroller.
5. novel high-precision synchronized sampling high resistance earthing fault indicator according to claim 1, which is characterized in that described
Data collection unit include:
STM32 and its peripheral circuit take electricity and energy management circuit, the instruction of short range LED failure, 4G by circuit connection solar energy
Module and its peripheral circuit, wireless transmission unit, including STM32 single-chip microcontroller, the connection STM32 single-chip microcontroller as clock source
External active voltage controlled crystal oscillator；
Solar energy takes electricity and energy management circuit, and solar energy is used to take electricity and the common power supply mode of battery for STM32 and its periphery
Circuit, 4G module and its peripheral circuit, the power supply of data test introduction wireless transmission unit；
The instruction of short range LED failure, is used for indicating fault, can see locally；
4G module and its peripheral circuit receive for carrying out data communication with cloud server main station system and collect unit
After abnormal data test introduction, sensor unit upload the data to server by 4G, closes 4G after being transmitted；
Wireless transmission unit for sensor unit and collects the real time communication between unit, transmission abnormality data test introduction.
6. novel high-precision synchronized sampling high resistance earthing fault indicator according to claim 5, which is characterized in that described
Wireless transmission unit include LoRa module and its peripheral circuit, for sensor unit and collect between unit it is wireless in real time
Communication, transmission abnormality data test introduction.
7. novel high-precision synchronized sampling high resistance earthing fault indicator according to claim 1, which is characterized in that described
Monitoring unit include:
GPS time service module and interface circuit, for exporting one-second burst signal, the second pulse signal is as sample count base
Standard corrects timer clock of the voltage controlled crystal oscillator as the MCU of clock source, realizes High Precision Time Stamps, it is ensured that sampling precise synchronization；
STM32 and its peripheral circuit, the external active including STM32 single-chip microcontroller, the connection STM32 single-chip microcontroller as clock source
Voltage controlled crystal oscillator；
4G module and its peripheral circuit, for sending abnormal data test introduction to the data collection unit；
Local data store, for store residual voltage acquisition data when timestamp, in case 4G send test introduction to
Collect unit；
Power circuit, for being the STM32 and its peripheral circuit, 4G module and its peripheral circuit, local data store
It powers with GPS time service module and interface circuit；
Residual voltage monitoring and data acquisition circuit acquire residual voltage via ADC chip, and ADC acquisition chip is holotype,
MCU is slave pattern, information exchange is realized with SPI, using DMA mode storing data.
8. novel high-precision synchronized sampling high resistance earthing fault indicator according to claim 7, which is characterized in that described
Power circuit is designed as 12V and turns the MCU power supply that 3.3V is STM32 single-chip microcontroller, and it is that 4G module and its peripheral circuit supply that 12V, which turns 3.8V,
Electricity, 12V turn the ADC that 5V is STM32 single-chip microcontroller and power.
9. being existed according to novel high-precision synchronized sampling high resistance earthing fault indicator, feature described in claim 2,5 or 7
In the external active voltage controlled crystal oscillator model TG5032CAN.
10. being existed according to novel high-precision synchronized sampling high resistance earthing fault indicator, feature described in claim 2,5 or 7
In the STM32 single-chip microcontroller uses STM32L4+ single-chip microcontroller.
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