CN114552785A - Low-voltage transformer area short-circuit fault positioning system and method based on HPLC communication - Google Patents
Low-voltage transformer area short-circuit fault positioning system and method based on HPLC communication Download PDFInfo
- Publication number
- CN114552785A CN114552785A CN202210173168.7A CN202210173168A CN114552785A CN 114552785 A CN114552785 A CN 114552785A CN 202210173168 A CN202210173168 A CN 202210173168A CN 114552785 A CN114552785 A CN 114552785A
- Authority
- CN
- China
- Prior art keywords
- module
- short
- current
- circuit
- circuit fault
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004891 communication Methods 0.000 title claims abstract description 91
- 238000004128 high performance liquid chromatography Methods 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims description 14
- 238000001514 detection method Methods 0.000 claims abstract description 26
- 230000003993 interaction Effects 0.000 claims abstract description 5
- 230000003750 conditioning effect Effects 0.000 claims description 15
- 238000012423 maintenance Methods 0.000 claims description 15
- 238000005070 sampling Methods 0.000 claims description 12
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- 238000012935 Averaging Methods 0.000 claims description 3
- 230000003321 amplification Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 239000000284 extract Substances 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 description 5
- 238000007726 management method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000035772 mutation Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00007—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using the power network as support for the transmission
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Human Computer Interaction (AREA)
- Locating Faults (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention relates to a low-voltage transformer area short-circuit fault positioning system based on HPLC communication, which comprises: the CCO central coordination unit is arranged at the highest level of the low-voltage transformer area, and the STA terminal units are arranged at branches of all levels of the low-voltage transformer area; the CCO central coordination unit comprises a first control module, an operation module, a first HPLC communication module and a first power supply module, wherein the operation module, the first HPLC communication module and the first power supply module are electrically connected with the first control module; the first HPLC communication module is also electrically connected with the low-voltage power line; the STA terminal unit comprises a second control module, and a short-circuit fault detection module, a second HPLC communication module and a second power module which are electrically connected with the second control module; the short-circuit fault detection module is used for detecting the current of the branch circuit and converting the current into a voltage signal to be transmitted to the second control module, and the second control module judges whether the short-circuit fault occurs in the branch circuit according to the collected current characteristics; and the CCO central coordination unit and each STA terminal unit perform data interaction through the HPLC communication module.
Description
Technical Field
The invention relates to a low-voltage transformer area short-circuit fault positioning system and method based on HPLC communication, and belongs to the technical field of short-circuit fault positioning of power systems.
Background
With the increasing demand of the society on electric power, the scale of the power grid is continuously enlarged, and the problem of short-circuit fault in a low-voltage transformer area not only directly influences the electric energy quality of electric power users, but also seriously influences the safe and stable operation of a power distribution network. Therefore, in recent years, China invests huge capital to carry out large-scale transformation on the low-voltage distribution network. Through upgrading and transformation of the low-voltage distribution network, the structure of urban and rural power grids in China is changed, and the equipment performance of the low-voltage distribution network is greatly improved. The improvement of the power distribution network hardware equipment provides material guarantee for guaranteeing the whole urban and rural power supply, but the normal and stable operation of the power distribution network needs to be guaranteed, only upgrading the hardware equipment is not enough, the equipment management level of the power distribution network needs to be synchronously improved, and particularly the actual management level of short-circuit faults in the low-voltage power distribution network needs to be improved.
In order to meet the requirements of the safety and the stability of an electric power system, ensure the operation condition in a low-voltage distribution network and timely eliminate the hidden trouble of short-circuit fault in a line, the electric power department expends huge manpower and material resources to carry out operation, inspection and maintenance every year. Because the topological structure of the low-voltage transformer area in most domestic areas is complicated, after a short-circuit fault occurs, the traditional mode is as follows: the power user reports the occurrence of the circuit fault, and then the operation and maintenance personnel troubleshoot the fault point on site, so that the working intensity is high, the working efficiency is low, and meanwhile, when the large-range and multiple short-circuit faults occur, the working capacity of the operation and maintenance personnel becomes huge. Along with the construction of a novel electric power system, the technologies such as the CAN bus, the GPRS and the Zigbee are gradually applied to low-voltage short-circuit fault location, a new solution is provided for the short-circuit fault location, but the new technologies CAN not be popularized in most of the low-voltage transformer areas in China due to the defects that external circuits are needed, high flow cost is required, and communication is transmitted at low speed and short distance. The HPLC communication technology is power line carrier communication with carrier signal frequency greater than 1MHZ, the occupied channel of the channel is wide, the speed of data transmission is high, the single transmission data volume is large, two-way communication can be realized, additional communication lines are not needed, and the installation is convenient, so that the requirement of short circuit fault location in a low-voltage distribution room can be met.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a low-voltage distribution area short-circuit fault positioning system based on HPLC communication, which saves the labor and time cost required by short-circuit fault position checking and improves the intelligent level and the modern management level of the low-voltage distribution area.
The technical scheme of the invention is as follows:
in one aspect, the present invention provides a low-voltage distribution room short-circuit fault location system based on HPLC communication, including: the CCO central coordination unit is arranged at the highest level of the low-voltage transformer area, and the STA terminal units are arranged at branches of all levels of the low-voltage transformer area;
the CCO central coordination unit comprises a first control module, an operation module, a first HPLC communication module and a first power supply module, wherein the operation module, the first HPLC communication module and the first power supply module are electrically connected with the first control module; the operation module is used for inputting an operation instruction to the first control module; the first HPLC communication module is also electrically connected with a low-voltage power line and outputs and receives high-frequency carrier data through the power line; the first power supply module provides electric energy for an electricity utilization module in the CCO central coordination unit;
the STA terminal unit comprises a second control module, and a short-circuit fault detection module, a second HPLC communication module and a second power module which are electrically connected with the second control module; the short-circuit fault detection module is used for detecting the current of the branch and converting the current into a voltage signal to be transmitted to the second control module, and the second control module judges whether the short-circuit fault occurs in the branch according to the collected current characteristics; the second HPLC communication module is also electrically connected with the power line and used for outputting and receiving high-frequency carrier data through the power line; the second power supply module provides electric energy for the power utilization module in the STA terminal unit;
and the CCO central coordination unit and each STA terminal unit carry out communication interaction through the first HPLC communication module, the second HPLC communication module and the power line.
As a preferred embodiment, the first control module and the second control module each include an MCU control chip and a peripheral circuit.
As a preferred embodiment, the operation module is an operation panel, and includes an LCD display and keys.
As a preferred embodiment, the first HPLC communication module and the second HPLC communication module each include a strong current unit and a weak current unit, the strong current unit is electrically connected to a zero line and a live line of a low-voltage power line through L, N two ports, the weak current unit of the first HPLC communication module is communicatively connected to the first control module through a UART serial port, and the weak current unit of the second HPLC communication module is communicatively connected to the second control module through a UART serial port.
As a preferred embodiment, the first power supply module and the second power supply module each include a rectifier circuit and a chopper circuit; the input end of the rectifying circuit is connected with the low-voltage power line, the output end of the rectifying circuit is connected with the chopper circuit, the rectifying circuit is used for rectifying alternating current output by the power line into direct current, and the chopper circuit is used for conditioning the input direct current into reference voltages of different specifications and respectively supplying power to each power utilization module.
In a preferred embodiment, the short-circuit fault detection module comprises a flexible rogowski coil and a current conditioning circuit; the flexible Rogowski coil is sleeved on the power line of the branch where the flexible Rogowski coil is located, the output end of the flexible Rogowski coil is electrically connected with the current conditioning circuit, and the flexible Rogowski coil is used for inductively coupling the current of the power line of the branch where the flexible Rogowski coil is located, converting the current information and transmitting the current information to the current conditioning circuit; the current conditioning circuit is electrically connected with the second control module and is used for carrying out integral amplification on the current signal and then outputting the current signal to the second control module.
As a preferred embodiment, a current true effective value detection unit is arranged in the second control unit, the current true effective value detection unit extracts current break variable information of the power line from the received signal, and determines whether a short-circuit fault occurs in a branch where the STA terminal unit is located by comparing the extracted current break variable information with a preset threshold.
As a preferred embodiment, the working process of the current true effective value detection unit specifically includes: setting a sampling frequency, sampling according to the sampling frequency, averaging current signals of continuous N sampling points, and judging that the branch circuit has a short-circuit fault when the obtained average value is greater than a preset threshold value.
On the other hand, the invention provides a low-voltage distribution area short-circuit fault positioning method based on HPLC communication, which is realized based on the low-voltage distribution area short-circuit fault positioning system based on HPLC communication in any embodiment of the invention, and comprises the following steps:
installing STA terminal units at each level of branch in a low-voltage transformer area, setting a unique address for each STA terminal unit, installing a CCO central coordination unit at the highest level of the low-voltage transformer area, and writing topology structure information corresponding to the STA terminal units of each level of branch in the CCO central coordination unit;
the short-circuit fault detection module in each STA terminal unit detects the current of the branch in real time and transmits the current to the second control unit, and the second control unit judges whether a short-circuit fault occurs according to the current information;
if the short-circuit fault is judged to occur, recording current fault information, packaging the current fault information into a standard message form, and waiting for a fault reporting instruction;
an operation and maintenance maintainer inputs a fault query instruction to a first control module through an operation module of a CCO central coordination unit, and the first control module sends a fault report instruction to each STA terminal unit through a first HPLC communication module according to the address of each STA terminal unit;
after receiving the fault reporting instruction, each STA terminal unit inquires whether short-circuit fault information exists, and if the short-circuit fault information exists, the fault information in the form of a standard message is uploaded to a low-voltage power line through a second HPLC communication module; the CCO central coordination unit receives fault information in the power line through a first HPLC communication module, analyzes a message and analyzes a short-circuit fault position by using topological structure information;
and the CCO central coordination unit transmits the analyzed short-circuit fault position to an LCD display screen for displaying.
As a preferred embodiment, the method comprises a fault information cleaning step, specifically:
after the maintenance staff to be operated get rid of the short-circuit fault problem from the analyzed short-circuit fault position to the corresponding branch circuit, inputting a maintenance finishing instruction through an operation module of the CCO central coordination unit;
after receiving the overhaul finishing instruction, the first control unit sends a fault clearing instruction to each STA terminal module in a broadcast mode through the first HPLC communication module;
and after each STA terminal module receives the fault zero clearing instruction, clearing the recorded short-circuit fault information.
The invention has the following beneficial effects:
1. according to the low-voltage distribution area short-circuit fault positioning system based on HPLC communication, a high-speed communication network is built on the basis of an original low-voltage distribution area through an HPLC broadband high-frequency power line carrier technology, and quick and effective interaction of information in the low-voltage distribution area is achieved. Through the STA terminal unit, whether the branch where the short circuit fault occurs is detected in real time, and the accurate positioning of the short circuit fault is realized by combining an HPLC high-speed communication network.
2. According to the low-voltage transformer area short-circuit fault positioning system based on HPLC communication, the current mutation information in the power line is extracted through the current true effective value detection unit, if the current mutation information exceeds the set threshold value, the short-circuit fault can be judged to occur, and the short-circuit fault can be effectively detected after the short-circuit fault occurs by using the short-circuit fault detection technology.
3. According to the low-voltage transformer district short-circuit fault positioning system based on HPLC communication, operation and maintenance staff can use the CCO central coordination unit to issue the short-circuit fault positioning instruction through the operation module, the CCO central coordination unit can automatically assemble and analyze fault detection information of all STA terminal units to generate fault positions, and manpower and material resources consumed by operation and maintenance departments for troubleshooting the fault positions are saved.
Drawings
FIG. 1 is a schematic diagram of an installation location of a low-voltage transformer area short-circuit fault location system in an embodiment of the invention;
FIG. 2 is a schematic diagram of the structure of a CCO central coordination unit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a STA terminal unit according to an embodiment of the present invention;
fig. 4 is a flowchart of a low-voltage transformer area short-circuit fault location method in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be understood that the step numbers used herein are for convenience of description only and are not intended as limitations on the order in which the steps are performed.
It is to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The terms "comprises" and "comprising" indicate the presence of the described features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The term "and/or" refers to and includes any and all possible combinations of one or more of the associated listed items.
The first embodiment is as follows:
referring to fig. 1 to fig. 3, the present embodiment provides a low-voltage transformer area short-circuit fault location system based on HPLC communication, including:
the CCO central coordination unit is installed at the highest level of the low-voltage transformer area, and the STA terminal units are installed at branches of all levels of the low-voltage transformer area;
referring specifically to fig. 2, the CCO central coordination unit includes a first control module, and an operation module, a first HPLC communication module and a first power supply module electrically connected to the first control module; the operation module is used for inputting an operation instruction to the first control module; the first HPLC communication module is also electrically connected with a low-voltage power line and outputs and receives high-frequency carrier data through the power line; the first power supply module provides electric energy for an electricity utilization module in the CCO central coordination unit;
specifically referring to fig. 3, the STA terminal unit includes a second control module, and a short-circuit fault detection module, a second HPLC communication module, and a second power module electrically connected to the second control module; the short-circuit fault detection module is used for detecting a current signal of the branch, converting the current signal into a small voltage signal and transmitting the small voltage signal to the second control module, and the second control module judges whether the branch has a short-circuit fault according to the current signal; the second HPLC communication module is also electrically connected with the low-voltage power line and used for outputting and receiving high-frequency carrier data through the power line; the second power supply module provides electric energy for the power utilization module in the STA terminal unit;
and the CCO central coordination unit and each STA terminal unit carry out communication interaction through the first HPLC communication module, the second HPLC communication module and the power line.
In the embodiment, the CCO central coordination unit is used for communicating with each STA terminal unit, and the short-circuit fault detection module and the HPLC communication mechanism are used for realizing automatic and rapid positioning of the short-circuit fault and improving the operation and maintenance management level of the low-voltage transformer area.
As a preferred implementation manner of this embodiment, the first control module and the second control module are both composed of an MCU control chip and a peripheral circuit, and the peripheral circuit is responsible for providing a clock source, filtering, and the like.
As a preferred embodiment of this embodiment, the operation module is an operation panel, and includes an LCD display screen and a key, where the LCD display screen and the key are both electrically connected to the first control unit, and when a worker needs to query a fault location, the worker inputs a related instruction through the key, and after the CCO central coordination unit determines a short-circuit fault location, the worker can display the fault location through the LCD display screen.
As a preferred embodiment of this embodiment, the first HPLC communication module and the second HPLC communication module each include a strong current unit and a weak current unit, the strong current unit is electrically connected to a zero line and a live line of a power line through an LN two port, the weak current unit of the first HPLC communication module is communicatively connected to the first control module through a UART serial port, and the weak current unit of the second HPLC communication module is communicatively connected to the second control module through a UART serial port. When information is sent, the first HPLC communication module or the second HPLC communication module modulates the information to be transmitted into a high-frequency signal, and the high-frequency signal is coupled to a low-voltage power line after being subjected to power amplification, so that the information is sent. When receiving information, the first HPLC communication module or the second HPLC communication module captures the high-frequency signal in the power line, and modulates the high-frequency signal into a digital signal to be sent into a corresponding control unit through a UART serial port.
As a preferred implementation manner of this embodiment, the first power supply module and the second power supply module each include a rectifier circuit, a chopper circuit, and a protection circuit; the input end of the rectifying circuit is connected with the power line, the output end of the rectifying circuit is connected with the chopper circuit, the rectifying circuit is used for rectifying 220V alternating current output by the power line into direct current, and the chopper circuit is used for conditioning the input direct current into reference voltages of 3.3V, 5V, 12V and-5V respectively and supplying power to each power utilization module respectively.
As a preferred implementation manner of this embodiment, the short-circuit fault detection module includes a flexible rogowski coil and a current conditioning circuit; the flexible Rogowski coil is sleeved on the power line of the branch where the flexible Rogowski coil is located and electrically connected with the current conditioning circuit, the near kiloampere current of the flexible Rogowski coil during short circuit fault occurrence can be converted into weak voltage of dozens of millivolts by utilizing the electromagnetic induction principle, the weak voltage is sent into the current conditioning circuit, and the current conditioning circuit can condition the signal into a 0-3.3V direct current voltage signal which can be identified by the MCU of the second control module.
As a preferred embodiment of this embodiment, a current true effective value detection unit is disposed in the second control unit, and the current true effective value detection unit extracts current break variable information of the power line from the received current signal, and determines whether a short-circuit fault occurs in a branch in which the STA terminal unit is located by comparing the extracted current break variable information with a preset threshold.
As a preferred embodiment of this embodiment, the working process of the current true effective value detecting unit specifically includes: setting a sampling frequency, sampling according to the sampling frequency, averaging current signals of ten continuous sampling points, and judging that the branch circuit has a short-circuit fault when the obtained average value is greater than a preset threshold value.
Example two:
referring to fig. 1 and 4, the present embodiment provides a low-voltage distribution room short-circuit fault location method based on HPLC communication, and is implemented based on the low-voltage distribution room short-circuit fault location system based on HPLC communication in the first embodiment, and includes the following steps:
s1: when the system is installed, respectively installing STA terminal units at each level of branch in a low-voltage station area, setting different 12-bit 16-system addresses which are different from other STA terminal units and meet a DL/T645 protocol for each STA terminal unit, installing a CCO central coordination unit at the highest level of the low-voltage station area, and writing topology structure information corresponding to the STA terminal units of each level of branch in the CCO central coordination unit;
s2: after the short-circuit fault occurs, the current waveform of the branch where the short-circuit fault is located changes obviously, taking the short-circuit fault of the branch where the STA (6) is located as an example, STA terminal units (STA (1), STA (3) and STA (6)) of the branch where the short-circuit fault occurs detect line current change information through the fault detection module and transmit the information to the second control unit, and the second control unit judges whether the short-circuit fault of the branch occurs or not by using the current true effective value detection unit and records the information.
S3: if the short-circuit fault is judged to occur, recording current fault information, packaging the current fault information into a DL/T645 extended standard message form, and waiting for a fault reporting instruction;
s4: after a fault occurs for a plurality of milliseconds, the traditional protection acts instantaneously, and at the moment, the whole line where the fault is located loses power;
s5: an operation and maintenance maintainer inputs a fault query instruction to a first control module through an operation module of a CCO central coordination unit, and the first control module sends a fault report instruction to each STA terminal unit through a first HPLC communication module according to the address of each STA terminal unit;
s6: after receiving the fault reporting instruction, each STA terminal unit inquires whether short-circuit fault information exists, and if the short-circuit fault information exists, the fault information in the form of a standard message is uploaded to a low-voltage power line through a second HPLC communication module; the CCO central coordination unit receives carrier information in the power line through a first HPLC communication module, analyzes messages according to the sequence of a frame header, a frame tail, an address field, a control code, a data length and a check sum, analyzes an STA terminal unit (STA (6)) nearest to a fault point by using topological structure information, and records fault information;
s7: and the CCO central coordination unit transmits the analyzed short-circuit fault position to an LCD display screen for displaying, so that short-circuit fault positioning is realized.
S8: after the maintenance staff to be operated get rid of the short-circuit fault problem from the analyzed short-circuit fault position to the corresponding branch circuit, inputting a maintenance finishing instruction through an operation module of the CCO central coordination unit;
after receiving the overhaul finishing instruction, the first control unit sends a fault clearing instruction to each STA terminal module in a broadcast mode through the first HPLC communication module;
and after each STA terminal module receives the fault zero clearing instruction, clearing the recorded short-circuit fault information.
The short-circuit fault positioning method saves the labor and time cost required by the short-circuit fault position investigation, and simultaneously improves the intelligent level and the modernized management level of the low-voltage transformer area.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A low-voltage transformer district short-circuit fault positioning system based on HPLC communication is characterized by comprising: the CCO central coordination unit is arranged at the highest level of the low-voltage transformer area, and the STA terminal units are arranged at branches of all levels of the low-voltage transformer area;
the CCO central coordination unit comprises a first control module, an operation module, a first HPLC communication module and a first power supply module, wherein the operation module, the first HPLC communication module and the first power supply module are electrically connected with the first control module; the operation module is used for inputting an operation instruction to the first control module; the first HPLC communication module is also electrically connected with a low-voltage power line and outputs and receives high-frequency carrier data through the power line; the first power supply module provides electric energy for an electricity utilization module in the CCO central coordination unit;
the STA terminal unit comprises a second control module, and a short-circuit fault detection module, a second HPLC communication module and a second power module which are electrically connected with the second control module; the short-circuit fault detection module is used for detecting the current of the branch and converting the current into a voltage signal to be transmitted to the second control module, and the second control module judges whether the short-circuit fault occurs in the branch according to the collected current characteristics; the second HPLC communication module is also electrically connected with the power line and used for outputting and receiving high-frequency carrier data through the power line; the second power supply module provides electric energy for the power utilization module in the STA terminal unit;
and the CCO central coordination unit and each STA terminal unit carry out communication interaction through the first HPLC communication module, the second HPLC communication module and the power line.
2. The low-voltage transformer area short-circuit fault positioning system based on HPLC communication of claim 1, wherein: the first control module and the second control module both comprise an MCU control chip and a peripheral circuit.
3. The low-voltage transformer area short-circuit fault positioning system based on HPLC communication of claim 1, wherein: the operation module is an operation panel and comprises an LCD display screen and keys.
4. The low-voltage transformer area short-circuit fault positioning system based on HPLC communication of claim 1, wherein: the first HPLC communication module and the second HPLC communication module respectively comprise a strong current unit and a weak current unit, the strong current unit is respectively and electrically connected with a zero line and a live line of a low-voltage power circuit through L, N two ports, the weak current unit of the first HPLC communication module is in communication connection with the first control module through a UART serial port, and the weak current unit of the second HPLC communication module is in communication connection with the second control module through a UART serial port.
5. The low-voltage transformer area short-circuit fault positioning system based on HPLC communication of claim 1, wherein: the first power supply module and the second power supply module both comprise a rectifying circuit and a chopper circuit; the input end of the rectifying circuit is connected with the low-voltage power line, the output end of the rectifying circuit is connected with the chopper circuit, the rectifying circuit is used for rectifying alternating current output by the power line into direct current, and the chopper circuit is used for conditioning the input direct current into reference voltages of different specifications and respectively supplying power to each power utilization module.
6. The low-voltage transformer area short-circuit fault positioning system based on HPLC communication of claim 1, wherein: the short-circuit fault detection module comprises a flexible Roche coil and a current conditioning circuit; the flexible Rogowski coil is sleeved on the power line of the branch where the flexible Rogowski coil is located, the output end of the flexible Rogowski coil is electrically connected with the current conditioning circuit, and the flexible Rogowski coil is used for inductively coupling the current of the power line of the branch where the flexible Rogowski coil is located, converting the current information and transmitting the current information to the current conditioning circuit; the current conditioning circuit is electrically connected with the second control module and is used for carrying out integral amplification on the current signal and then outputting the current signal to the second control module.
7. The low-voltage transformer area short-circuit fault location system based on HPLC communication of claim 6, wherein: and a current true effective value detection unit is arranged in the second control unit, extracts current break variable information of the power line from the received signal, and determines whether the branch where the STA terminal unit is located has a short-circuit fault or not by comparing the extracted current break variable information with a preset threshold value.
8. The low-voltage transformer area short-circuit fault location system based on HPLC communication of claim 7, wherein: the working process of the current true effective value detection unit is specifically as follows: setting a sampling frequency, sampling according to the sampling frequency, averaging current signals of continuous N sampling points, and judging that the branch circuit has a short-circuit fault when the obtained average value is greater than a preset threshold value.
9. A low-voltage distribution room short-circuit fault location method based on HPLC communication, which is implemented based on the low-voltage distribution room short-circuit fault location system based on HPLC communication of any one of the above claims 1 to 8, and comprises the following steps:
installing STA terminal units at each level of branch in a low-voltage transformer area, setting a unique address for each STA terminal unit, installing a CCO central coordination unit at the highest level of the low-voltage transformer area, and writing topology structure information corresponding to the STA terminal units of each level of branch in the CCO central coordination unit;
the short-circuit fault detection module in each STA terminal unit detects the current of the branch in real time and transmits the current to the second control unit, and the second control unit judges whether a short-circuit fault occurs according to the current information;
if the short-circuit fault is judged to occur, recording current fault information, packaging the current fault information into a standard message form, and waiting for a fault reporting instruction;
an operation and maintenance maintainer inputs a fault query instruction to a first control module through an operation module of a CCO central coordination unit, and the first control module sends a fault report instruction to each STA terminal unit through a first HPLC communication module according to the address of each STA terminal unit;
after receiving the fault reporting instruction, each STA terminal unit inquires whether short-circuit fault information exists, and if the short-circuit fault information exists, the fault information in the form of a standard message is uploaded to a low-voltage power line through a second HPLC communication module; the CCO central coordination unit receives fault information in the power line through a first HPLC communication module, analyzes a message and analyzes a short-circuit fault position by using topological structure information;
and the CCO central coordination unit transmits the analyzed short-circuit fault position to an LCD display screen for displaying.
10. The method for positioning the short-circuit fault of the low-voltage distribution area based on the HPLC communication as claimed in claim 9, comprising a fault information cleaning step, specifically:
after the maintenance staff to be operated get rid of the short-circuit fault problem from the analyzed short-circuit fault position to the corresponding branch circuit, inputting a maintenance finishing instruction through an operation module of the CCO central coordination unit;
after receiving the overhaul finishing instruction, the first control unit sends a fault clearing instruction to each STA terminal module in a broadcast mode through the first HPLC communication module;
and after each STA terminal module receives the fault zero clearing instruction, clearing the recorded short-circuit fault information.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210173168.7A CN114552785B (en) | 2022-02-24 | 2022-02-24 | Low-voltage transformer area short-circuit fault positioning system and method based on HPLC communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210173168.7A CN114552785B (en) | 2022-02-24 | 2022-02-24 | Low-voltage transformer area short-circuit fault positioning system and method based on HPLC communication |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114552785A true CN114552785A (en) | 2022-05-27 |
| CN114552785B CN114552785B (en) | 2024-09-03 |
Family
ID=81677308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210173168.7A Active CN114552785B (en) | 2022-02-24 | 2022-02-24 | Low-voltage transformer area short-circuit fault positioning system and method based on HPLC communication |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114552785B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103983885A (en) * | 2014-05-05 | 2014-08-13 | 国电南瑞科技股份有限公司 | Low-voltage circuit fault locating terminal and method used for power distribution substation region |
| WO2014154164A1 (en) * | 2013-03-29 | 2014-10-02 | 北京映翰通网络技术股份有限公司 | Method and system for detecting and locating single-phase ground fault on low current grounded power-distribution network |
| KR101452979B1 (en) * | 2014-04-28 | 2014-10-22 | 주식회사프로컴시스템 | Fault recorder having fault localization function using accident data of both ends in power system line, fault localization system comprising the same and method for controlling the same |
| CN110034785A (en) * | 2019-03-27 | 2019-07-19 | 国网山东省电力公司青岛供电公司 | The method that power-off fault quickly positions is realized based on power line carrier communication |
| CN112904146A (en) * | 2021-01-22 | 2021-06-04 | 南京海兴电网技术有限公司 | Low-voltage user station area power failure fault positioning device and method based on HPLC |
-
2022
- 2022-02-24 CN CN202210173168.7A patent/CN114552785B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014154164A1 (en) * | 2013-03-29 | 2014-10-02 | 北京映翰通网络技术股份有限公司 | Method and system for detecting and locating single-phase ground fault on low current grounded power-distribution network |
| KR101452979B1 (en) * | 2014-04-28 | 2014-10-22 | 주식회사프로컴시스템 | Fault recorder having fault localization function using accident data of both ends in power system line, fault localization system comprising the same and method for controlling the same |
| CN103983885A (en) * | 2014-05-05 | 2014-08-13 | 国电南瑞科技股份有限公司 | Low-voltage circuit fault locating terminal and method used for power distribution substation region |
| CN110034785A (en) * | 2019-03-27 | 2019-07-19 | 国网山东省电力公司青岛供电公司 | The method that power-off fault quickly positions is realized based on power line carrier communication |
| CN112904146A (en) * | 2021-01-22 | 2021-06-04 | 南京海兴电网技术有限公司 | Low-voltage user station area power failure fault positioning device and method based on HPLC |
Non-Patent Citations (1)
| Title |
|---|
| 苏尚流;缪希仁;吴立敏;: "低压配电系统多层级网络选择性协调保护机制技术", 电气技术, no. 01, 15 January 2016 (2016-01-15) * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114552785B (en) | 2024-09-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109995145B (en) | Low-voltage distribution network fault active study and judgment method based on intelligent distribution transformer terminal | |
| CN101697497B (en) | Multifunctional electrical energy information concentrator and communication method thereof | |
| CN202737576U (en) | Intelligent measure-control apparatus used for low voltage power distribution network | |
| CN103840552B (en) | Power distribution room monitoring method and system | |
| CN102064604A (en) | Multifunctional electric energy information concentrator and working method thereof | |
| CN108051726A (en) | High voltage direct current Control protection system board test device | |
| CN201498990U (en) | Source-side power-saving network control system | |
| CN103545926A (en) | Distributed power supply grid connection interface device | |
| CN204669086U (en) | Communication power supply monitoring data collection device and system thereof | |
| CN109103906A (en) | A kind of three-phase power distribution system and three-phase imbalance compensation device | |
| CN201904652U (en) | Concentrator for power consumption information of users | |
| CN206657058U (en) | A kind of Transformer Short Circuit Impedance on-line detecting system | |
| CN114552785B (en) | Low-voltage transformer area short-circuit fault positioning system and method based on HPLC communication | |
| CN111600379A (en) | Medium-voltage line variable relation identification system | |
| CN110994787A (en) | Low-voltage distribution network automation equipment and system | |
| CN211209379U (en) | Distribution terminal full coverage area distributed self-healing system | |
| CN214506661U (en) | System based on low-voltage transformer area line loss rapid positioning | |
| CN209786872U (en) | transformer station power consumption parameter acquisition device based on multiple local area wireless communication technologies | |
| CN214152187U (en) | Intelligent substation training system | |
| CN210039082U (en) | Intelligent electricity utilization safety detection equipment based on EnOcean communication technology | |
| CN210629198U (en) | Low-voltage distribution network topology identification system based on pulse characteristic current signals | |
| CN210404847U (en) | Power distribution network power consumption information acquisition and power distribution structure topology recognition system | |
| CN204479698U (en) | Wireless networking formula high precision fast line selection device | |
| CN203537070U (en) | Distributed power supply grid connection interface device | |
| CN209432994U (en) | A kind of voltage transformer error on-line calibration device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |