CN215894808U - Based on travelling wave range finding location distribution fault isolation positioner - Google Patents
Based on travelling wave range finding location distribution fault isolation positioner Download PDFInfo
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- CN215894808U CN215894808U CN202122016086.5U CN202122016086U CN215894808U CN 215894808 U CN215894808 U CN 215894808U CN 202122016086 U CN202122016086 U CN 202122016086U CN 215894808 U CN215894808 U CN 215894808U
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The utility model discloses a power distribution fault isolation positioning device based on traveling wave ranging positioning, which comprises a core board, a display board, a power supply, an input and output board, an analog board, a GPS/Beidou time synchronization module, a GPRS communication plug-in module, a traveling wave detection circuit and an AD sampling chip, wherein the display board, the power supply, the input and output board, the analog board, the GPS/Beidou time synchronization module and the GPRS communication plug-in module are all connected with the core board, and the traveling wave detection circuit and the AD sampling chip are connected between the core board and the analog board, and the analog board provides analog signals for the traveling wave detection circuit and the AD sampling chip. The requirements of reliability and compatibility are fully considered in the aspects of overall design and design of each plug-in, the fault judgment method is not influenced by a grounding mode, the fault judgment accuracy is high, and zero misjudgment is basically achieved; the fault point positioning can be realized, and the positioning precision is greatly improved.
Description
Technical Field
The utility model relates to the technical field of power distribution, in particular to a distribution fault isolation positioning device based on traveling wave ranging positioning.
Background
In the current power grid structure in China, the grounding modes can be divided into the following different grounding modes according to the difference of the grounding modes of the central points of lines: (1) the neutral point is directly grounded; (2) the neutral point is grounded through a high resistance; (3) the neutral point is grounded through an arc suppression coil; (4) the neutral point is not grounded.
After single-phase grounding occurs in a low-current grounding system, the voltage of a fault phase to ground is reduced, the voltage of a non-fault phase to ground is increased, but the line voltages are still symmetrical, and the system can still run for 1-2 h because continuous power supply to users is not influenced. This is also the greatest advantage of low current grounding systems
The new standard stipulates that the requirement of safe and stable operation of the conventional power distribution network cannot be met after the power distribution network is operated for 2 hours with faults, and the faults are quickly isolated just after the instantaneous earth fault is avoided.
Control equipment or fault indicating equipment is installed on a line, and the control equipment does not perform particularly effective fault treatment aiming at the single-phase earth fault, so that the currently installed control equipment (such as an FTU) cannot adapt to the single-phase earth fault; the development of the fault indicator is the mainstream method and technology for solving the problem of single-phase grounding at present, but the fault indicator cannot remove the fault nearby on the spot, so that the fault range is easily expanded, and more equipment faults, fire disasters and the like are caused.
When the power grid has a fault, a fault point generates voltage and current traveling waves, the voltage and current traveling waves are transmitted to the whole power grid along a line at a certain speed, and the fault can be accurately and quickly found and the fault point can be positioned according to the time when the traveling waves reach each measuring point and the traveling wave transmission speed. The technology is successfully applied to the power transmission network and achieves good effect.
The fault recording method is to judge fault points by comparing fault recording data of each point of the line, and if the fault points are judged according to different zero-sequence current characteristics of the fault line and the non-fault line, different zero-sequence current characteristics of the front and the rear of the fault points and other data. The FTU and the fault sensor have fault recording functions, but the fault cannot be judged by single-point wave recording data.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems in the prior art, the utility model provides a distribution fault isolation positioning device based on traveling wave ranging positioning.
In order to achieve the purpose, the utility model adopts the following specific scheme:
the utility model provides a based on travelling wave range finding location distribution fault isolation positioner, its characterized in that includes nuclear core plate and all display panel, power and input/output board, analog board, GPS big dipper time checking module, GPRS communication plug-in components module rather than being connected to and connect travelling wave detection circuitry and AD sampling chip between nuclear core plate and analog board, the analog board provides analog signal for travelling wave detection circuitry and AD sampling chip.
Preferably, the core board is a dual chip, and includes a first CPU and a second CPU, and the second CPU is connected to the traveling wave detection circuit.
Preferably, the traveling wave detection circuit adopts an electronic sensor, collects signals from the analog board, and is connected with the second CPU in a serial port communication mode.
Preferably, the analog board comprises a three-phase current signal, a three-phase voltage signal, a zero-sequence current signal and a zero-sequence voltage signal, all the signals are isolated by a mutual inductor, enter the AD sampling chip and then are sent to the first CPU.
Preferably, the zero sequence voltage signal and the zero sequence current signal are arranged to pass through a traveling wave detection circuit, and the sampling frequency reaches 1 MHz.
Preferably, the first CPU is of a model STM32F407, and the second CPU is of a model STM32H 743.
Preferably, the power supply and input/output module adopts a capacitor energy-taking and double backup power supply, and a plurality of network ports and serial ports are reserved.
Preferably, a serial communication mode is adopted between the display board and the core board.
Preferably, the display panel includes a display screen, an LED lamp, and a key.
Preferably, the display panel uses an STM32F103 chip.
By adopting the technical scheme of the utility model, the utility model has the following beneficial effects:
the requirements of reliability and compatibility are fully considered in the aspects of overall design and design of each plug-in, the fault judgment method is not influenced by a grounding mode, the fault judgment accuracy is high, and zero misjudgment is basically achieved; the fault point positioning can be realized, and the positioning precision is greatly improved.
Drawings
FIG. 1 is a block diagram of functional modules of the present invention.
Detailed Description
The utility model is further described below with reference to the following figures and specific examples.
Referring to fig. 1, the utility model provides a distribution fault isolation positioning device based on traveling wave ranging positioning, which comprises a core board 1, a display board 2, a power supply, an input and output board 3, an analog board 4, a GPS/big dipper time synchronization module 5, a GPRS communication plug-in module 6, a traveling wave detection circuit 7 and an AD sampling chip 8 (ADC) connected between the core board 1 and the analog board 4, wherein the analog board 4 provides analog signals for the traveling wave detection circuit 7 and the AD sampling chip 8.
The core board 1 is designed to be compatible with double chips and comprises a first CPU and a second CPU, and the second CPU is connected with the traveling wave detection circuit. The first CPU adopts the model to be STM32F407 for accomplish the main function of the device, the second CPU adopts the model to be STM32H743, STM32H743 is used for catching trouble travelling wave data.
The traveling wave detection circuit 7 adopts an electronic sensor, collects signals from the analog board 4 and is connected with a second CPU in a serial port communication mode; the traveling wave detection circuit 7 adopts an electronic sensor for sampling, and a sampling loop of the electronic sensor has small null shift and flexible and adjustable impedance; the sampling precision reaches 0.5s, and the minimum value can acquire 0.001V signals. In order to improve the sampling precision and the anti-interference performance of small signals, the operational amplifier can be added on the basis of the traditional sampling loop, namely, the input impedance of the sampling loop is enhanced, and meanwhile, the small signal sampling loop has a good isolation effect and a good effect.
The analog board 4 comprises a three-phase current signal 1V, a three-phase voltage signal 3.25V, a zero-sequence current signal and a zero-sequence voltage signal, all the signals are isolated by a mutual inductor, enter an AD sampling chip 8 and then are sent to a first CPU, and therefore the main functions of the device are achieved.
The zero sequence voltage signal and the zero sequence current signal are set to pass through the traveling wave detection circuit 7, the sampling frequency reaches 1MHz, and the zero sequence voltage signal and the zero sequence current signal can be completed only by adopting a second CPU with high performance; and the information is sent to the first CPU in a serial port communication mode, and the information is uploaded uniformly.
The device adopts the electric capacity to get can and two back-up power, can follow high-voltage capacitor and get the electricity, manages lithium cell and super capacitor simultaneously and charges.
The power supply adopts 24V rated input of a circuit, the range is 18-36V, necessary anti-interference processing is carried out, and other processing needs to be realized by matching with an external power supply module. The power supply and input/output module 3 has 11-way open input amount, adopts photoelectric isolation, has 3-way open output amount, and has 3-way remote control signals of remote control switch-on, remote control switch-off and energy storage; 2-path network ports are provided, and the FSMC of the first CPU is used for expansion; 5 serial ports are reserved for the outside, and 232 levels are reserved (2 serial ports are required by the FTU; other module connection is expanded in the future).
A serial port communication mode is adopted between the display panel 2 and the core panel 1, and an STM32F103 chip is independently adopted, so that the pressure of a first CPU is reduced; the display panel 2 comprises a display screen, an LED lamp and keys, the development of displaying menus, word banks, display and the like can be independently carried out, and meanwhile, the display requirements can be rapidly changed according to market requirements.
The GPS/Beidou time synchronization module 5 adopts a dual-mode satellite synchronous clock, the time precision is 1us, and the voltage sampling frequency is 1 MHz; the method is not influenced by a grounding mode, the fault judgment accuracy is high, and zero misjudgment is basically achieved; fault point positioning can be realized, and positioning accuracy is greatly improved; high-resistance grounding type faults can be identified, and the grounding resistance can reach as large as K.
The utility model combines the multipoint zero sequence voltage generating time of the line and the zero sequence current wave recording data to carry out comprehensive analysis, adopts the zero sequence current analysis to carry out section selection and interval determination, and adopts the zero sequence voltage time to carry out accurate positioning. The single-phase earth fault positioning position can be judged within the range of 500m, fault finding is greatly facilitated, fault processing time is shortened, and power supply reliability is improved. The analysis and positioning method can be implemented by the prior art and is not described in detail herein.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the technical scope of the present invention, which are directly or indirectly applicable to other related technical fields within the spirit of the present invention are included in the scope of the present invention.
Claims (10)
1. The utility model provides a based on travelling wave range finding location distribution fault isolation positioner, its characterized in that includes nuclear core plate and all display panel, power and input/output board, analog board, GPS big dipper time checking module, GPRS communication plug-in components module rather than being connected to and connect travelling wave detection circuitry and AD sampling chip between nuclear core plate and analog board, the analog board provides analog signal for travelling wave detection circuitry and AD sampling chip.
2. The traveling wave ranging-based positioning distribution fault isolation positioning device according to claim 1, wherein the core board is a dual chip including a first CPU and a second CPU, and the second CPU is connected to the traveling wave detection circuit.
3. The traveling wave ranging positioning power distribution fault isolation positioning device based on claim 2, wherein the traveling wave detection circuit adopts an electronic sensor, collects signals from an analog board, and is connected with the second CPU in a serial port communication mode.
4. The traveling wave ranging-based power distribution fault isolation and positioning device as claimed in claim 2, wherein the analog board comprises three-phase current signals, three-phase voltage signals, zero-sequence current signals and zero-sequence voltage signals, and all the signals are isolated by a mutual inductor, enter an AD sampling chip and then are sent to the first CPU.
5. The traveling wave ranging based power distribution fault isolation positioning device according to claim 4, wherein the zero sequence voltage signal and the zero sequence current signal are arranged to pass through a traveling wave detection circuit and the sampling frequency reaches 1 MHz.
6. The traveling wave ranging positioning power distribution fault isolation positioning device based on claim 2, wherein the first CPU is of a type STM32F407, and the second CPU is of a type STM32H 743.
7. The traveling wave ranging positioning power distribution fault isolation positioning device based on claim 1, wherein the power supply and input and output module adopts a capacitor energy taking and double backup power supply, and a plurality of network ports and serial ports are reserved.
8. The traveling wave ranging-based positioning distribution fault isolation positioning device according to claim 1, wherein a serial port communication mode is adopted between the display board and the core board.
9. The traveling wave ranging based power distribution fault isolation positioning device according to claim 7, wherein the display panel comprises a display screen, an LED lamp and a key.
10. The traveling wave ranging-based positioning distribution fault isolation positioning device according to claim 9, wherein the display board adopts an STM32F103 chip.
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| CN202122016086.5U CN215894808U (en) | 2021-08-25 | 2021-08-25 | Based on travelling wave range finding location distribution fault isolation positioner |
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| CN202122016086.5U CN215894808U (en) | 2021-08-25 | 2021-08-25 | Based on travelling wave range finding location distribution fault isolation positioner |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115308528A (en) * | 2022-08-05 | 2022-11-08 | 中宝电气有限公司 | Intelligent feeder terminal capable of accurately positioning single-phase earth fault based on Internet of things technology |
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2021
- 2021-08-25 CN CN202122016086.5U patent/CN215894808U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115308528A (en) * | 2022-08-05 | 2022-11-08 | 中宝电气有限公司 | Intelligent feeder terminal capable of accurately positioning single-phase earth fault based on Internet of things technology |
| CN115308528B (en) * | 2022-08-05 | 2023-09-22 | 中宝电气有限公司 | Intelligent feeder terminal for accurately positioning single-phase ground fault based on Internet of things technology |
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