CN112698153B - Fault positioning method and system for overhead distribution line - Google Patents
Fault positioning method and system for overhead distribution line Download PDFInfo
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- CN112698153B CN112698153B CN202011438357.XA CN202011438357A CN112698153B CN 112698153 B CN112698153 B CN 112698153B CN 202011438357 A CN202011438357 A CN 202011438357A CN 112698153 B CN112698153 B CN 112698153B
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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 invention discloses a fault positioning method and a fault positioning system for an overhead distribution line, wherein the method comprises the following steps: the on-line monitoring device arranged at the overhead distribution line end calculates the distance from the fault point to the on-line monitoring device through a double-end traveling wave ranging technology; the online monitoring device determines two towers adjacent to the fault point according to the calculated distance and the prestored distribution line length between each tower along the overhead distribution line and the online monitoring device; and taking the distribution line between the two towers as a fault point troubleshooting line to locate the fault point. The invention is convenient for operation and maintenance personnel to quickly find the fault point position of the overhead distribution line, and can maintain in time after the fault occurs, thereby improving the power supply reliability.
Description
Technical Field
The invention relates to the technical field of power grid fault monitoring, in particular to a fault positioning method and system for an overhead distribution line.
Background
The traveling wave ranging is widely applied to the online monitoring and the accurate positioning of the power line faults, and the traveling wave ranging utilizes the high-frequency transient traveling wave signals generated when the power line breaks down to propagate along the power line. The traveling wave monitoring device is additionally arranged at one end or two ends of the power line, the high-frequency transient traveling wave signal is monitored in real time, and the fault point position is calculated through the time of the traveling wave reaching the traveling wave monitoring device and the traveling wave propagation speed in the power line. At this time, the calculated position is the distance from the fault point to the traveling wave monitoring device.
The overhead distribution line has long power supply distance and wide coverage radius, has extremely high requirements on power supply reliability, and needs to quickly and accurately find out the position of a fault point to overhaul the overhead distribution line once the overhead distribution line breaks down, so as to restore power supply.
However, even if the distance from the fault point to the traveling wave monitoring device is calculated through the existing traveling wave ranging technology and device, operation and maintenance repair staff can hardly find the accurate position of the fault point through the distance, the traveling wave monitoring device is required to be used as a starting point to be arranged along the overhead distribution line, arc hammer and reservation exist on the path of the overhead distribution line, and time and labor are wasted in accurately finding the position of the fault point. At present, the method often needs more than 1 hour from the occurrence of the fault to the finding of the fault point position, so that the power failure time is long after the fault of the overhead distribution line, and the power supply reliability is reduced.
Disclosure of Invention
Therefore, the invention aims to provide a fault positioning method, device and system for an overhead distribution line, which can be convenient for operation and maintenance personnel to quickly find the fault point position of the overhead distribution line, and can be maintained in time after the fault occurs, so that the power supply reliability is improved.
Based on the above object, the present invention provides a fault locating method for an overhead distribution line, comprising:
the on-line monitoring device arranged at the overhead distribution line end calculates the distance from the fault point to the on-line monitoring device through a double-end traveling wave ranging technology;
the online monitoring device determines two towers adjacent to the fault point according to the calculated distance and the prestored distribution line length between each tower along the overhead distribution line and the online monitoring device;
and taking the distribution line between the two towers as a fault point troubleshooting line to locate the fault point.
The on-line monitoring device determines two adjacent towers of the fault point according to the calculated distance and the prestored distribution line length between each tower along the overhead distribution line and the on-line monitoring device, and specifically comprises:
determining the length of a distribution line between each tower and the online monitoring device, wherein the length of the distribution line is smaller than the maximum distribution line of the distance and the length of the distribution line is larger than the minimum distribution line of the distance;
and determining the towers corresponding to the determined distribution line length as two towers adjacent to the fault point.
The invention also provides a fault positioning system of the overhead distribution line, which comprises:
the pole towers are arranged along the overhead distribution lines and are used for supporting the overhead distribution lines;
the sensors are arranged at two ends of the overhead distribution line and are used for collecting high-frequency transient traveling wave current signals and power frequency current signals of the overhead distribution line in real time;
the two on-line monitoring devices are respectively arranged at two ends of the overhead distribution line and are used for calculating the distance from a fault point to the on-line monitoring device through a double-end traveling wave distance measurement technology according to the high-frequency transient traveling wave current signals and the power frequency current signals which are acquired in real time; determining two towers adjacent to the fault point according to the calculated distance and the prestored distribution line length between each tower along the overhead distribution line and the online monitoring device; and taking the distribution line between the two towers as a fault point troubleshooting line to locate the fault point.
Wherein, the sensor specifically includes: the high-frequency current sensor and the power frequency voltage sensor are respectively used for collecting the high-frequency transient traveling wave current signal and the power frequency current signal of the overhead distribution line in real time.
Wherein the system further comprises: a system main station; and
the on-line monitoring device is also used for sending the two determined towers adjacent to the fault point and the fault point checking line between the two towers to the system main station.
Wherein, the online monitoring device includes:
the fault distance calculation module is used for calculating the distance from the fault point to the online monitoring device through a double-end traveling wave ranging technology by the online monitoring device arranged at the end of the overhead distribution line;
the fault detection line determining module is used for determining two towers adjacent to the fault point according to the calculated distance and the pre-stored distribution line length between each tower along the overhead distribution line and the online monitoring device; and taking the distribution line between the two towers as a fault point troubleshooting line to locate the fault point.
Wherein, troubleshooting circuit confirms the module, include:
the fault point adjacent tower determining unit is used for determining the length of the distribution line between each tower and the online monitoring device, wherein the length of the distribution line is smaller than the maximum distribution line of the distance and the length of the distribution line is larger than the minimum distribution line of the distance; determining towers corresponding to the determined distribution line length as two towers adjacent to the fault point;
and the checking line determining unit is used for taking the distribution line between the two determined towers as a fault point checking line so as to locate the fault point.
The invention also provides an on-line monitoring device, comprising:
the fault distance calculation module is used for calculating the distance from the fault point to the online monitoring device through a double-end traveling wave ranging technology by the online monitoring device arranged at the end of the overhead distribution line;
the fault detection line determining module is used for determining two towers adjacent to the fault point according to the calculated distance and the pre-stored distribution line length between each tower along the overhead distribution line and the online monitoring device; and taking the distribution line between the two towers as a fault point troubleshooting line to locate the fault point.
The invention also provides an electronic device comprising a central processing unit, a signal processing and storing unit and a computer program stored on the signal processing and storing unit and operable on the central processing unit, wherein the central processing unit performs the fault locating method of the overhead distribution line as described above.
According to the technical scheme, an on-line monitoring device arranged at the end of an overhead distribution line calculates the distance from a fault point to the on-line monitoring device through a double-end traveling wave ranging technology; the online monitoring device determines two towers adjacent to the fault point according to the calculated distance and the prestored distribution line length between each tower along the overhead distribution line and the online monitoring device; and taking the distribution line between the two towers as a fault point troubleshooting line to locate the fault point. Therefore, operation and maintenance repair staff can only conduct fault investigation on fault point investigation lines between two towers, the operation and maintenance repair staff can conveniently and rapidly find the fault point positions of the overhead distribution lines, maintenance can be conducted in time after faults occur, and power supply reliability is improved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a fault location system of an overhead distribution line according to an embodiment of the present invention;
fig. 2 is a flow chart of a fault locating method for an overhead distribution line according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a tower arrangement of an overhead distribution line according to an embodiment of the present invention;
FIG. 4 is a functional block diagram of an on-line monitoring device according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a hardware structure of an electronic device of an on-line monitoring device according to an embodiment of the present invention.
Detailed Description
The present invention will be further described in detail below with reference to specific embodiments and with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent.
It should be noted that unless otherwise defined, technical or scientific terms used in the embodiments of the present invention should be given the ordinary meaning as understood by one of ordinary skill in the art to which the present disclosure pertains. The terms "first," "second," and the like, as used in this disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
The following describes the technical scheme of the embodiment of the present invention in detail with reference to the accompanying drawings.
The embodiment of the invention provides a fault positioning system for an overhead distribution line, the architecture of which is shown in figure 1, and the fault positioning system comprises: the system comprises a pole tower 2 arranged along an overhead distribution line 3, sensors 5 arranged at two ends of the overhead distribution line, and two on-line monitoring devices 4 distributed at two ends of the overhead distribution line.
Wherein the overhead distribution line 3 is supplied with electric energy by the substation 1; the transformer substation 1 is a place for reducing and distributing electric energy.
The towers 2, which are routed along the overhead distribution lines 3, are used to support the overhead distribution lines, typically 50 meters in length.
The overhead distribution line 3 is A/B/C three-phase, is mainly made of conductors and transmits 10kV electric energy.
The sensor 5 comprises a high-frequency current sensor and a power frequency voltage sensor, and respectively acquires a high-frequency transient traveling wave current signal and a power frequency current signal of the overhead distribution line in real time; the sensor 5 transmits the collected signals to the local on-line monitoring device 4 through a coaxial cable. The signal acquisition bandwidth of the high-frequency sensor is 100k-5MHz, and the signal input range is as follows: 0A-1000A (peak-to-peak), the output signal range is: 3-5V. The signal acquisition bandwidth of the power frequency sensor: 0-1kHz; signal input range: 0-20kV (peak-to-peak value), and the output signal range is as follows: 3-5V.
The online monitoring device 4 is used for calculating the distance from the fault point to the online monitoring device through a double-end traveling wave distance measurement technology according to the high-frequency transient traveling wave current signal and the power frequency current signal which are acquired in real time; determining two towers adjacent to the fault point according to the calculated distance and the prestored distribution line length between each tower along the overhead distribution line and the online monitoring device; and taking the distribution line between the two towers as a fault point troubleshooting line to locate the fault point.
Further, the fault locating system for the overhead distribution line provided by the embodiment of the invention can further comprise: a system main station;
the on-line monitoring device 4 is further configured to send the determined two towers adjacent to the fault point and a fault point troubleshooting line between the two towers to the system master station.
Therefore, operation and maintenance repair staff can only conduct fault investigation on fault point investigation lines between two towers, the operation and maintenance repair staff can conveniently and rapidly find the fault point positions of the overhead distribution lines, maintenance can be conducted in time after faults occur, and power supply reliability is improved.
In the fault location system of the overhead distribution line, a specific method flow of the on-line monitoring device 4 for fault location of the overhead distribution line is shown in fig. 2, and includes the following steps:
step S201: the on-line monitoring device 4 arranged at the overhead distribution line end calculates the distance from the fault point to the on-line monitoring device through the double-end traveling wave ranging technology.
Specifically, as shown in fig. 3, it is assumed that on-line monitoring devices provided at both ends of an overhead distribution line are an on-line monitoring device a and an on-line monitoring device B, respectively; the on-line monitoring device A is arranged at the head end M end of the overhead distribution line, namely on a tower G1 close to one end of the transformer substation; the on-line monitoring device B is arranged at the tail end N end of the overhead distribution line, namely the last pole tower Gn. The overhead distribution line is erected along the M end towards the N end. The tower G1 is a 1 st tower of the overhead distribution line along the direction from the M end to the N end, the tower G2 is a 2 nd tower of the overhead distribution line along the direction from the M end to the N end, and the tower Gn is an nth and last tower of the overhead distribution line along the direction from the M end to the N end in sequence; conversely, the tower G1 is the last tower of the overhead distribution line along the direction from the N end to the M end, and the tower Gn is the first tower of the overhead distribution line along the direction from the N end to the M end.
The length of the overhead distribution line between the M end and the N end is known as L, the length of the overhead distribution line between the pole tower G2 and the M end is a known value, and the length is defined as L MG2 In turn, the length of the overhead distribution line between the poles G3 and M is a known value, designated L MG3 The length of the overhead distribution line between the poles Gn and M is a known value, L. In the same way, the length of the overhead distribution line between the tower G1 and the N end is a known value, and is defined as L, and the length of the overhead distribution line between the tower G2 and the N end is a known value and is defined as L NG2 The length of the overhead distribution line between the poles Gn-1 and N is a known value, designated L NGn-1 The method comprises the steps of carrying out a first treatment on the surface of the Parameters of each tower are stored in the on-line monitoring device in advance.
When the overhead distribution line breaks down, the online monitoring device calculates the distance from the fault point to the M end to be L through the double-end traveling wave ranging principle M Distance to N end is L N Then there is L M +L N ＝L。
Step S202: and the on-line monitoring device determines a fault point checking line between the two towers according to the calculated distance and the prestored distribution line length between each tower along the overhead distribution line and the on-line monitoring device.
In this step, the on-line monitoring device 4 determines, according to the calculated distance and the prestored distribution line length between each tower along the overhead distribution line and the on-line monitoring device, two towers adjacent to the fault point: determining the length of a distribution line between each tower and the online monitoring device, wherein the length of the distribution line is smaller than the maximum distribution line of the distance and the length of the distribution line is larger than the minimum distribution line of the distance; determining towers corresponding to the determined distribution line length as two towers adjacent to the fault point; further, the on-line monitoring device 4 uses the distribution line between the two towers as a fault point troubleshooting line to locate the fault point.
Specifically, the calculated L may be M And L stored in an on-line monitoring device MG2 To L MGN Setting the GX tower as any one tower from G1 to Gn, setting the GX-1 tower as the last tower from G in the direction from M end to N end, setting the GX+1 tower as the next tower from G in the direction from M end to N end, and comparing with L MG2 To L MGX Are all smaller than L M And L is MGX+1 To L MGN Are all greater than L M When the fault point position is judged to be between the GX pole tower and the GX+1 pole tower preliminarily;
further, the position of the fault point can be verified through the N end: when compared with L NG1 To L NGX Are all greater than L N And L is NGn To L NGX+1 Are all smaller than L N And determining that the fault point position occurs between the GX pole tower and the GX+1 pole tower.
Therefore, operation and maintenance repair staff can only conduct fault investigation on fault point investigation lines between two towers, the operation and maintenance repair staff can conveniently and rapidly find the fault point positions of the overhead distribution lines, maintenance can be conducted in time after faults occur, and power supply reliability is improved.
Based on the above method for fault location of overhead distribution lines, a functional block diagram of an on-line monitoring device, as shown in fig. 4, includes the following modules: a fault distance calculation module 401 and a fault checking line determination module 402.
The fault distance calculation module 401 is used for calculating the distance from a fault point to the online monitoring device through a double-end traveling wave ranging technology by the online monitoring device arranged at the end of the overhead distribution line;
the fault detection line determining module 402 is configured to determine two towers adjacent to the fault point according to the calculated distance and a pre-stored distribution line length between each tower along the overhead distribution line and the online monitoring device; and taking the distribution line between the two towers as a fault point troubleshooting line to locate the fault point.
The troubleshooting line determining module 402 may specifically include: the fault point adjacent pole tower determining unit 411 and the troubleshooting line determining unit 412.
The fault point adjacent tower determining unit 411 determines a maximum distribution line length smaller than the distance and a minimum distribution line length larger than the distance among the distribution line lengths between each tower and the present on-line monitoring device; determining towers corresponding to the determined distribution line length as two towers adjacent to the fault point;
the troubleshooting line determination unit 412 takes the determined distribution line between the two towers as a troubleshooting line to locate the fault point.
Fig. 5 shows a schematic hardware structure of an online monitoring device as an electronic device according to the present embodiment, where the device may include: the device comprises an analog quantity acquisition unit 501, a signal processing and storage unit 502, a central processing unit 503, a display unit 504, an operation unit 505 and a communication unit 506. The analog acquisition unit 501 is connected with the signal processing and storage unit 502, the signal processing and storage unit 502 is connected with the central processing unit 503, and the display unit 504, the operation unit 505 and the communication unit 506 are all connected with the central processing unit 503.
The analog quantity acquisition unit 501 may include: overvoltage protection module, signal conditioning module, analog-to-digital conversion AD. Wherein the analog-to-digital conversion A/D includes a high-speed analog-to-digital conversion A/D and a low-speed analog-to-digital conversion A/D. The A/B/C three-phase high-frequency current sensor sends the collected high-frequency current signal to the high-speed analog-to-digital conversion A/D through the overvoltage protection module and the signal conditioning module, and the high-speed analog-to-digital conversion A/D converts the current analog signal into a digital signal and sends the digital signal to the signal processing and storage unit 502. The A/B/C three-phase power frequency voltage sensor sends the collected power frequency current signal to the low-speed analog-to-digital conversion A/D through the overvoltage protection module and the signal conditioning module, and the low-speed analog-to-digital conversion A/D converts the voltage analog signal into a digital signal and sends the digital signal to the signal processing and storing unit 502.
The overvoltage protection module adopts a 12V/5A stabilized voltage power supply; the three-phase high-frequency current sensor and the three-phase power frequency voltage sensor respectively send the collected current and voltage signals to the overvoltage protection module, the voltage stabilizing range of the overvoltage protection module is 12V, the voltage stabilizing part of the overvoltage protection module is formed by adding a 7805 three-terminal voltage stabilizer to a current-expanding triode, and the potential of the adjusting end of the voltage-stabilizing part is raised by the serial voltage drop of a voltage stabilizing diode and a light emitting diode. The overvoltage protection adopts a mode of a silicon controlled short-circuit power supply to force the fuse to be quickly fused to protect the safety of a later-stage circuit, and the fusing time is 1-3 microseconds.
The signal conditioning module converts the voltage signal of +/-3-5V which is sent by the overvoltage protection module into a current signal of +/-2-3 mA.
The specific model of the analog-to-digital conversion A/D can be AD9252, the module is provided with an 8-channel high-speed A/D and an 8-channel low-speed A/D, 14 bits, 50MSPS and a 2k analog-to-digital converter (ADC), the module is powered by a 1.8V single power supply, and an on-chip sample and hold circuit is built in the module, so that the module has the advantages of low price, low power consumption, small size, easiness in use and the like. The 64-pin LFCP packaging meeting RoHS standard is adopted, and the rated temperature range is an industrial temperature range of-40 ℃ to +85 ℃.
The signal processing and storing unit 502 may be specifically an FPGA, which mainly performs preprocessing and pre-operation on data, and has a digital sampling interface with 16 channels inside, and performs data preprocessing and logic pre-operation on the received digital signal. The FPGA model used can be XC7Z020 of Xilinx company, and consists of a programmable input-output unit, a programmable logic unit, a clock management unit, an embedded block RAM, an embedded bottom layer functional unit and an embedded special hardware module 6. The FPGA can be used repeatedly without a special programmer, and has the advantages of radiation resistance, high and low temperature resistance, low power consumption, high speed and the like. Integrates the functions of the common RAM, clock management, DSP and the like. Synchronous clock coding inside the FPGA: the high-precision clock generates a time signal with the precision reaching ns level, and the time signal is sent to the FPGA for precisely calibrating the trigger time, and the recorded and stored waveform is provided with a precise time mark. The time signal is input in 1PPS mode. The synchronization signal receiving circuit directly receives 1PPS pulses from the GPS synchronization clock. SRAM 1-4 in FPGA is static random access memory, and the parameters such as overhead distribution line fault waveform and storage overhead distribution line and shaft tower position that buffer memory was gathered.
The signal processing and storing unit 502 sends the information of preprocessing and pre-operation to the central processing unit 503 through the internal CAN bus interface, and the Central Processing Unit (CPU) further performs data operation and processing; the signal processing and storage unit 502 may also store a computer program running on a central processing unit, which when executed by the central processing unit 503 may implement the fault locating method of the overhead distribution line as described above.
The central processing unit 503 is connected to the display unit 504, the operation unit 505, and the communication unit 506 at the same time. The CPU model used by the central processing unit 503 is a DSC chip of STM32f407VG, the internal resources of the chip are many, the storage capacity is large, the price is low, meanwhile, the ARM chip is provided with a wireless communication interface and an Ethernet communication interface, PWM waves can be generated, and analog quantity, picture information, control signals, alarm signals and the like can be processed and output rapidly.
The display unit 504 may include an indicator light indication and a liquid crystal display screen display. The indication lamps include status indication lamps, power indication lamps, communication indication lamps, fault indication lamps, operation indication lamps, self-checking indication lamps and the like. The liquid crystal display screen displays operation information, fault information, position information and the like of the overhead distribution line in real time on a human-computer interaction interface. The optical coupler is of the type TLP112, and the stability and anti-interference performance of the input and output state quantity and analog quantity signals are ensured.
The operation unit 505 may be connected to the central processing unit 503 through optocoupler isolation, and includes "up, down, left, right, cancel, confirm" operation keys. The optical coupler is of a TLP112 type, so that the stability and anti-interference performance of an input signal are ensured.
The communication unit 506 may specifically include a remote communication network port and a USB debug interface connected to a remote master station system. The remote communication network port is RJ45 and is connected with the remote master station system, and the remote communication network port transmits information to the remote master station system and receives various instructions of the master station system. The USB debugging interface is connected with an external computer, and updates a program or sets a constant value parameter for the on-line monitoring device.
It should be noted that, although the above apparatus only shows the analog quantity acquisition unit 501, the signal processing and storage unit 502, the central processing unit 503, the display unit 504, the operation unit 505, and the communication unit 506, in the specific implementation, the apparatus may further include other components necessary for realizing the normal operation. Furthermore, it will be understood by those skilled in the art that the above-described apparatus may include only the components necessary to implement the embodiments of the present description, and not all the components shown in the drawings.
According to the technical scheme, an on-line monitoring device arranged at the end of an overhead distribution line calculates the distance from a fault point to the on-line monitoring device through a double-end traveling wave ranging technology; the online monitoring device determines two towers adjacent to the fault point according to the calculated distance and the prestored distribution line length between each tower along the overhead distribution line and the online monitoring device; and taking the distribution line between the two towers as a fault point troubleshooting line to locate the fault point. Therefore, operation and maintenance repair staff can only conduct fault investigation on fault point investigation lines between two towers, the operation and maintenance repair staff can conveniently and rapidly find the fault point positions of the overhead distribution lines, maintenance can be conducted in time after faults occur, and power supply reliability is improved.
The computer readable media of the present embodiments, including both permanent and non-permanent, removable and non-removable media, may be used to implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device.
Those of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of the disclosure, including the claims, is limited to these examples; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the invention, the steps may be implemented in any order and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.
Additionally, well-known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown within the provided figures, in order to simplify the illustration and discussion, and so as not to obscure the invention. Furthermore, the devices may be shown in block diagram form in order to avoid obscuring the invention, and also in view of the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform within which the present invention is to be implemented (i.e., such specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the invention, it should be apparent to one skilled in the art that the invention can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative in nature and not as restrictive.
While the invention has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of those embodiments will be apparent to those skilled in the art in light of the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may use the embodiments discussed.
The embodiments of the invention are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omission, modification, equivalent replacement, improvement, etc. of the present invention should be included in the scope of the present invention.
Claims (7)
1. A method of fault location for an overhead power distribution line, comprising:
the high-frequency current sensor and the power frequency voltage sensor arranged at the end of the overhead distribution line collect the high-frequency transient traveling wave current signal and the power frequency current signal of the overhead distribution line in real time;
the on-line monitoring device arranged at the overhead distribution line end calculates the distance from the fault point to the on-line monitoring device through a double-end traveling wave distance measurement technology according to the high-frequency transient traveling wave current signal and the power frequency current signal;
the online monitoring device determines two towers adjacent to the fault point according to the calculated distance and the prestored distribution line length between each tower along the overhead distribution line and the online monitoring device;
taking a distribution line between the two towers as a fault point troubleshooting line to locate a fault point;
the on-line monitoring device determines two adjacent towers of the fault point according to the calculated distance and the prestored distribution line length between each tower along the overhead distribution line and the on-line monitoring device, and specifically comprises: determining the length of a distribution line between each tower and the online monitoring device, wherein the length of the distribution line is smaller than the maximum distribution line of the distance and the length of the distribution line is larger than the minimum distribution line of the distance; determining towers corresponding to the determined distribution line length as two towers adjacent to the fault point;
specifically, the calculated L M And L stored in an on-line monitoring device MG2 To L MGN Setting the GX tower as any one tower from G1 to Gn, setting the GX-1 tower as the last tower from G in the direction from M end to N end, setting the GX+1 tower as the next tower from G in the direction from M end to N end, and comparing with L MG2 To L MGX Are all smaller than L M And L is MGX+1 To L MGN Are all greater than L M When the fault point position is judged to be between the GX pole tower and the GX+1 pole tower preliminarily;
further, verifying the fault point position through the N end: when compared with L NG1 To L NGX Are all greater than L N And L is NGn To L NGX+1 Are all smaller than L N When the fault point position is determined and judged to occur between the GX pole tower and the GX+1 pole tower;
wherein the overhead distribution line comprises a head end M end and a tail end N end, the length of the overhead distribution line between the M end and the N end is L, and the distance from a fault point to the M end is L M Distance to N end is L N And L is M +L N =l; the pole tower G1 is the 1 st pole tower of the overhead distribution line along the direction from the M end to the N end, and the pole tower Gn is the nth pole tower of the overhead distribution line along the direction from the M end to the N end and is also the last pole tower; the length of the overhead distribution line between the pole G2 and the M end is L MG2 The length of the overhead distribution line between the GX end and the M end of the pole tower is L MGX The length of the overhead distribution line between the pole tower GX+1 and the end M is L MGX+1 The length of the overhead distribution line between the M end and the N end is L MGN The length of the overhead distribution line between the pole G1 and the N end is L NG1 The length of the overhead distribution line between the GX end and the N end of the pole tower is L NGX The length of the overhead distribution line between the Gn end and the N end of the pole tower is L NGn The length of the overhead distribution line between the pole tower GX+1 and the N end is L NGX+1 。
2.A fault location system for an overhead power distribution line, comprising:
the pole towers are arranged along the overhead distribution lines and are used for supporting the overhead distribution lines;
the sensors are arranged at two ends of the overhead distribution line and are used for collecting high-frequency transient traveling wave current signals and power frequency current signals of the overhead distribution line in real time;
the two on-line monitoring devices are respectively arranged at two ends of the overhead distribution line and are used for calculating the distance from a fault point to the on-line monitoring device through a double-end traveling wave distance measurement technology according to the high-frequency transient traveling wave current signals and the power frequency current signals which are acquired in real time; determining the maximum distribution line length smaller than the distance and the minimum distribution line length larger than the distance in the distribution line lengths between each tower and the online monitoring device according to the calculated distance and the pre-stored distribution line length between each tower along the overhead distribution line and the online monitoring device, and determining the tower corresponding to the determined distribution line length as two towers adjacent to the fault point; taking a distribution line between the two towers as a fault point troubleshooting line to locate a fault point;
specifically, the calculated L M And L stored in an on-line monitoring device MG2 To L MGN Setting the GX tower as any one tower from G1 to Gn, setting the GX-1 tower as the last tower from G in the direction from M end to N end, setting the GX+1 tower as the next tower from G in the direction from M end to N end, and comparing with L MG2 To L MGX Are all smaller than L M And L is MGX+1 To L MGN Are all greater than L M When the fault point position is judged to be between the GX pole tower and the GX+1 pole tower preliminarily;
further, verifying the fault point position through the N end: when compared with L NG1 To L NGX Are all greater than L N And L is NGn To L NGX+1 Are all smaller than L N When the fault point position is determined and judged to occur between the GX pole tower and the GX+1 pole tower;
wherein the overhead distribution line comprises a head end M end and a tail end N end, the length of the overhead distribution line between the M end and the N end is L, and the distance from a fault point to the M end is L M Distance to N end is L N And L is M +L N =l; the pole tower G1 is the 1 st pole tower of the overhead distribution line along the direction from the M end to the N end, and the pole tower Gn is the nth pole tower of the overhead distribution line along the direction from the M end to the N end and is also the last pole tower; the length of the overhead distribution line between the pole G2 and the M end is L MG2 The length of the overhead distribution line between the GX end and the M end of the pole tower is L MGX Frame between GX+1 and M ends of towerThe length of the empty distribution line is L MGX+1 The length of the overhead distribution line between the M end and the N end is L MGN The length of the overhead distribution line between the pole G1 and the N end is L NG1 The length of the overhead distribution line between the GX end and the N end of the pole tower is L NGX The length of the overhead distribution line between the Gn end and the N end of the pole tower is L NGn The length of the overhead distribution line between the pole tower GX+1 and the N end is L NGX+1 ；
The sensor comprises in particular: the high-frequency current sensor and the power frequency voltage sensor are respectively used for collecting the high-frequency transient traveling wave current signal and the power frequency current signal of the overhead distribution line in real time.
3. The system of claim 2, further comprising: a system main station; and
the on-line monitoring device is also used for sending the two determined towers adjacent to the fault point and the fault point checking line between the two towers to the system main station.
4. A system according to any one of claims 2 or 3, wherein the on-line monitoring means comprises:
the fault distance calculation module is used for calculating the distance from the fault point to the online monitoring device through a double-end traveling wave ranging technology by the online monitoring device arranged at the end of the overhead distribution line;
the fault detection line determining module is used for determining two towers adjacent to the fault point according to the calculated distance and the pre-stored distribution line length between each tower along the overhead distribution line and the online monitoring device; and taking the distribution line between the two towers as a fault point troubleshooting line to locate the fault point.
5. The system of claim 4, wherein the troubleshooting line determination module comprises:
the fault point adjacent tower determining unit is used for determining the length of the distribution line between each tower and the online monitoring device, wherein the length of the distribution line is smaller than the maximum distribution line of the distance and the length of the distribution line is larger than the minimum distribution line of the distance; determining towers corresponding to the determined distribution line length as two towers adjacent to the fault point;
and the checking line determining unit is used for taking the distribution line between the two determined towers as a fault point checking line so as to locate the fault point.
6. An on-line monitoring device, comprising:
the fault distance calculation module is used for acquiring a high-frequency transient traveling wave current signal and a power frequency current signal of the overhead distribution line in real time by a high-frequency current sensor and a power frequency voltage sensor which are arranged at the overhead distribution line end, and an online monitoring device arranged at the overhead distribution line end calculates the distance from a fault point to the online monitoring device through a double-end traveling wave distance measurement technology according to the high-frequency transient traveling wave current signal and the power frequency current signal;
the fault detection line determining module is used for determining two towers adjacent to the fault point according to the calculated distance and the pre-stored distribution line length between each tower along the overhead distribution line and the online monitoring device; taking the distribution line between the two towers as a fault point troubleshooting line to locate a fault point,
wherein, troubleshooting circuit confirms the module, include:
the fault point adjacent tower determining unit is used for determining the length of the distribution line between each tower and the online monitoring device, wherein the length of the distribution line is smaller than the maximum distribution line of the distance and the length of the distribution line is larger than the minimum distribution line of the distance; determining towers corresponding to the determined distribution line length as two towers adjacent to the fault point;
specifically, the calculated L M And L stored in an on-line monitoring device MG2 To L MGN Setting the GX tower as any one tower from G1 to Gn, setting the GX-1 tower as the last tower from G to G in the direction from M to N,the GX+1 tower is the next tower in the direction from M end to N end, when compared with L MG2 To L MGX Are all smaller than L M And L is MGX+1 To L MGN Are all greater than L M When the fault point position is judged to be between the GX pole tower and the GX+1 pole tower preliminarily;
further, verifying the fault point position through the N end: when compared with L NG1 To L NGX Are all greater than L N And L is NGn To L NGX+1 Are all smaller than L N When the fault point position is determined and judged to occur between the GX pole tower and the GX+1 pole tower;
wherein the overhead distribution line comprises a head end M end and a tail end N end, the length of the overhead distribution line between the M end and the N end is L, and the distance from a fault point to the M end is L M Distance to N end is L N And L is M +L N =l; the pole tower G1 is the 1 st pole tower of the overhead distribution line along the direction from the M end to the N end, and the pole tower Gn is the nth pole tower of the overhead distribution line along the direction from the M end to the N end and is also the last pole tower; the length of the overhead distribution line between the pole G2 and the M end is L MG2 The length of the overhead distribution line between the GX end and the M end of the pole tower is L MGX The length of the overhead distribution line between the pole tower GX+1 and the end M is L MGX+1 The length of the overhead distribution line between the M end and the N end is L MGN The length of the overhead distribution line between the pole G1 and the N end is L NG1 The length of the overhead distribution line between the GX end and the N end of the pole tower is L NGX The length of the overhead distribution line between the Gn end and the N end of the pole tower is L NGn The length of the overhead distribution line between the pole tower GX+1 and the N end is L NGX+1 ；
And the checking line determining unit is used for taking the distribution line between the two determined towers as a fault point checking line so as to locate the fault point.
7. An electronic device comprising a central processing unit, a signal processing and storage unit, and a computer program stored on the signal processing and storage unit and executable on the central processing unit, characterized in that the central processing unit implements the method of claim 1 when executing the program.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441794A (en) * | 2013-09-05 | 2013-12-11 | 重庆大学 | Transformer station optical fiber fault locating system and method |
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| CN105911428A (en) * | 2016-04-28 | 2016-08-31 | 国网河南省电力公司电力科学研究院 | Voltage traveling wave based fault location apparatus |
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| CN104698338A (en) * | 2015-02-16 | 2015-06-10 | 广东电网有限责任公司茂名供电局 | Overhead power transmission line fault traveling wave locating method |
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