CN114743353A - High-voltage rubber jacketed flexible cable fault positioning early warning system and method based on clock synchronization - Google Patents
High-voltage rubber jacketed flexible cable fault positioning early warning system and method based on clock synchronization Download PDFInfo
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Abstract
The invention provides a high-voltage rubber jacketed flexible cable fault positioning early warning system and method based on clock synchronization, which comprises a monitoring server and a clock synchronization monitoring terminal, wherein the monitoring server and the clock synchronization monitoring terminal are communicated through a clock synchronization communication box; the clock synchronization communication box is connected with a plurality of clock synchronization monitoring terminals in series through optical fibers, and a cascade switching network is formed among the synchronization monitoring terminals; the clock synchronization monitoring terminal receives signals from the high-frequency signal acquisition device and the low-frequency signal acquisition device, processes the signals and uploads the processed signals to the monitoring server; the high-frequency signal acquisition device and the low-frequency signal acquisition device are arranged at the wiring position of a junction box or a high-voltage switch cabinet; the monitoring server receives the high-frequency and low-frequency signals collected by the clock synchronization monitoring terminal and acquires signal characteristics based on a built-in characteristic extraction model; meanwhile, based on the comparison between the acquired signal characteristics and a fault fingerprint database, the positioning early warning of the fault is realized.
Description
Technical Field
The invention belongs to the technical field of cable fault positioning and early warning, and particularly relates to a high-voltage rubber jacketed flexible cable fault positioning early warning system and method based on clock synchronization.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
In a 10kV power supply system under a coal mine, a power supply circuit of a mining working face is connected through a high-voltage explosion-proof junction box, the longest power supply distance is 10KM, most of roadways are non-linear roadways, millions of tons of output of the whole coal mine are generated due to large fluctuation of coal beds and poor transportation conditions, but few operators are needed, and peripheral equipment is not repaired by people; because of the limitation of the mining conditions, the length of the cable is uniformly distributed about 200m, and because the power supply distance is long, the number of junction boxes is large, the environmental water spraying of junction box installation is large, and the side part is easy to generate side damage and personnel injury, great difficulty and potential safety hazard are brought to the overhaul work and the safe operation of the equipment. Meanwhile, the temperature difference between the inside and the outside of the cavity of the junction box is large, the humidity cannot be controlled, and water condensation is easily formed to cause insulation reduction, partial discharge, grounding or short circuit and other faults. A high-voltage movable metal shielding monitoring type rubber jacketed flexible cable and a junction box used in an underground 10kV power supply system have monitoring blind spots, cannot monitor related data which easily cause power supply accidents due to insulation change, environment temperature and humidity, partial discharge, abnormal current and the like in real time, and cannot prevent the power supply accidents from happening, so that the accidents are expanded. Meanwhile, fault points cannot be found accurately in time, the junction boxes are required to be opened one by one to find the fault points after the circuit loses power due to faults, the power supply distance is long, the number of the junction boxes is large, electromechanical overhaul personnel face the requirements of a plurality of operation faces, the maintenance cannot be carried out in time, the on-site overhaul environment is severe, a large amount of manpower and material resources are required to be invested to find the circuit faults, the effective production time is greatly shortened, and potential safety hazards are brought to the safe operation and the safe production of a power supply system of a mine. Meanwhile, when a power supply line breaks down, discharge, ignition and short circuit can be caused, gas explosion is caused, casualties are caused, and safety production of a mine is seriously influenced.
The inventor finds that a sensor is generally placed in a junction box or partial discharge detection is performed on a cable body or current of a cable grounding wire is detected aiming at monitoring a high-voltage movable metal shielding monitoring type rubber jacketed flexible cable and the junction box used in a mining 10KV power supply system at present, but the existing monitoring method has the problems that power failure operation is needed, signals need to be injected into the existing power supply system, faults cannot be pre-warned or accurate positioning cannot be achieved and the like.
Disclosure of Invention
The invention provides a high-voltage rubber jacketed flexible cable fault positioning early warning system and a high-voltage rubber jacketed flexible cable fault positioning early warning method based on clock synchronization, the scheme realizes the clock synchronization between different monitoring terminals through optical fiber communication between a clock synchronization communication box and a clock synchronization monitoring terminal through a high-frequency signal acquisition device and a low-frequency signal acquisition device which are arranged at the wiring position of a junction box or a high-voltage switch cabinet, and further realizes the accurate early warning and positioning of the faults of the coal mine underground rubber jacketed flexible cable, the fault positioning of the scheme does not need to carry out signal injection on a coal mine underground high-voltage power supply system, does not need to carry out any transformation on the coal mine underground high-voltage power supply system, and does not need to power off in the installation process and does not influence the normal operation of a mine. .
According to a first aspect of the embodiment of the invention, a high-voltage rubber jacketed flexible cable fault positioning early warning system based on clock synchronization is provided, which comprises a monitoring server and a clock synchronization monitoring terminal, wherein the monitoring server and the clock synchronization monitoring terminal are communicated through a clock synchronization communication box;
the clock synchronization communication box is connected with a plurality of clock synchronization monitoring terminals in series through optical fibers, and a cascade switching network is formed among the synchronization monitoring terminals;
the clock synchronization monitoring terminal is used for receiving signals from the high-frequency signal acquisition device and the low-frequency signal acquisition device, processing the signals and uploading the processed signals to the monitoring server; the high-frequency signal acquisition device and the low-frequency signal acquisition device are arranged at the wiring position of a junction box or a high-voltage switch cabinet;
the monitoring server is used for receiving the high-frequency and low-frequency signals collected by the clock synchronization monitoring terminal and acquiring signal characteristics based on a built-in characteristic extraction model; meanwhile, based on the comparison between the acquired signal characteristics and a fault fingerprint database, the positioning early warning of the fault is realized.
Further, the clock synchronization communication box monitors the clock synchronization of the first clock synchronization monitoring terminal connected with the clock synchronization communication box; and each clock synchronous monitoring terminal carries out time service through a protocol message by the synchronous monitoring terminal above the clock synchronous monitoring terminal, and each synchronous monitoring terminal supports a network switching function.
Further, after the monitoring server receives the collected high-frequency and low-frequency signals, the specific processing process includes:
firstly, identifying a single pulse signal, and extracting a suspected fault pulse signal;
performing homologous signal identification on suspected fault pulse signals, and packaging signals generated by the same signal source;
and comparing a group of signals generated by the same signal source with a phase pulse characteristic fingerprint library formed under various working conditions on a phase distribution pulse intensity diagram, and judging whether the group of signals are abnormal working conditions or not based on similarity calculation.
Furthermore, when the abnormal working condition is judged, the same time of discharge signal is selected from the signals detected by two adjacent clock synchronization monitoring terminals by using the clock synchronization technology, so that the fault point is positioned.
Further, the fault fingerprint database includes a single pulse characteristic fingerprint database and a phase characteristic pulse diagram fingerprint database, and the generation of the fault fingerprint database specifically includes:
collecting high-frequency signals and low-frequency signals under different working conditions; extracting time domain characteristics and frequency domain characteristics of the monopulse signals, training the obtained characteristics through a machine learning algorithm, and forming monopulse characteristic fingerprint libraries corresponding to different working conditions;
alternatively, the first and second electrodes may be,
after high-frequency signals and low-frequency signals under different working conditions are collected, extracting a timestamp of a single-pulse signal, and converting corresponding time into a power frequency phase; and drawing a phase distribution pulse intensity graph by taking the power frequency phase of the single pulse signals as an abscissa and the signal intensity as an ordinate, and then performing machine learning training on the phase distribution pulse intensity graph to finally form a phase pulse characteristic fingerprint library under different working conditions.
Furthermore, the clock synchronization monitoring terminal comprises a clock synchronization communication unit and a signal processing unit, and the clock synchronization communication unit realizes a communication function, completes clock synchronization on a clock bus and transmits accurate clock information to the signal processing unit; the signal processing unit is used for receiving signals from the high-frequency signal acquisition device and the low-frequency signal acquisition device.
According to a second aspect of the embodiments of the present invention, there is provided a clock synchronization-based high-voltage cabtyre cable fault location early warning method, which is based on the above clock synchronization-based high-voltage cabtyre cable fault location early warning system, including:
acquiring high-frequency and low-frequency signals acquired by the clock synchronization monitoring terminal, and acquiring signal characteristics based on a built-in characteristic extraction model;
and comparing the acquired signal characteristics with a fault fingerprint database, and calculating a result based on the similarity to realize positioning and early warning of the fault.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention provides a high-voltage cabtyre flexible cable fault positioning early warning system and a high-voltage cabtyre flexible cable fault positioning early warning method based on clock synchronization.
(2) In the scheme of the invention, the high-frequency signal acquisition device and the high-frequency signal acquisition device are more convenient to install by adopting an open type waterproof design, are installed outside the junction box and the high-voltage switch cabinet, do not need to be opened, and are safer in construction operation.
(3) The fault location in the scheme of the invention is more accurate, the fault of the junction box can be accurately located to the failed junction box, the fault of the cable can be located within 10m, and the system can accurately classify the partial discharge of the cable, the overhigh humidity of the junction box, the poor contact of the junction box and the junction box, the fault of the junction box and the junction box, the interphase short circuit of the cable and the ground short circuit of the cable.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are included to illustrate an exemplary embodiment of the invention and not to limit the invention.
Fig. 1 is a schematic structural diagram of a high-voltage cabtyre cable fault positioning early warning system based on clock synchronization in the embodiment of the invention;
FIG. 2 is a schematic diagram of a process for forming a fingerprint database according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a real-time monitoring process according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a fault location method according to an embodiment of the present invention.
Detailed Description
The invention is further explained by the following embodiments in conjunction with the drawings.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The embodiments and features of the embodiments of the invention may be combined with each other without conflict.
The first embodiment is as follows:
the purpose of this embodiment is to provide a high pressure rubber jacketed flexible cable fault location early warning system based on clock synchronization.
A high-voltage rubber jacketed flexible cable fault positioning early warning system based on clock synchronization comprises a monitoring server and a clock synchronization monitoring terminal, wherein the monitoring server and the clock synchronization monitoring terminal are communicated through a clock synchronization communication box;
the clock synchronization communication box is connected with a plurality of clock synchronization monitoring terminals in series through optical fibers, and a cascade switching network is formed among the synchronization monitoring terminals;
the clock synchronization monitoring terminal is used for receiving signals from the high-frequency signal acquisition device and the low-frequency signal acquisition device, processing the signals and uploading the processed signals to the monitoring server; the high-frequency signal acquisition device and the low-frequency signal acquisition device are arranged at the wiring position of a junction box or a high-voltage switch cabinet;
the monitoring server is used for receiving the high-frequency and low-frequency signals collected by the clock synchronization monitoring terminal and acquiring signal characteristics based on a built-in characteristic extraction model; meanwhile, based on the comparison between the acquired signal characteristics and a fault fingerprint database, the positioning early warning of the fault is realized.
Further, the clock synchronization communication box monitors the clock synchronization of the first clock synchronization monitoring terminal connected with the clock synchronization communication box; and each clock synchronous monitoring terminal carries out time service through the protocol message by the synchronous monitoring terminal on the clock synchronous monitoring terminal, and each synchronous monitoring terminal supports the network switching function.
Further, after the monitoring server receives the collected high-frequency and low-frequency signals, the specific processing process includes:
firstly, identifying a single pulse signal, and extracting a suspected fault pulse signal;
performing homologous signal identification on suspected fault pulse signals, and packaging signals generated by the same signal source;
and comparing a group of signals generated by the same signal source with a phase pulse characteristic fingerprint library formed under various working conditions on a phase distribution pulse intensity diagram, and judging whether the group of signals are abnormal working conditions or not based on similarity calculation.
Furthermore, when the abnormal working condition is judged, the same time of discharge signal is selected from the signals detected by two adjacent clock synchronization monitoring terminals by using the clock synchronization technology, so that the fault point is positioned.
Further, the fault fingerprint database includes a single pulse characteristic fingerprint database and a phase characteristic pulse diagram fingerprint database, and the generation of the fault fingerprint database specifically includes:
collecting high-frequency signals and low-frequency signals under different working conditions; extracting time domain features and frequency domain features of the monopulse signals, training the obtained features through a machine learning algorithm, and forming monopulse feature fingerprint libraries corresponding to different working conditions;
alternatively, the first and second electrodes may be,
after high-frequency signals and low-frequency signals under different working conditions are collected, extracting a timestamp of a single-pulse signal, and converting corresponding time into a power frequency phase; and drawing a phase distribution pulse intensity graph by taking the power frequency phase as an abscissa and the signal intensity as an ordinate of the plurality of monopulse signals, and then performing machine learning training on the phase distribution pulse intensity graph to finally form a phase pulse characteristic fingerprint library under different working conditions.
Furthermore, the clock synchronization monitoring terminal comprises a clock synchronization communication unit and a signal processing unit, and the clock synchronization communication unit is used for realizing a communication function, completing clock synchronization on a clock bus and transmitting accurate clock information to the signal processing unit; the signal processing unit is used for receiving signals from the high-frequency signal acquisition device and the low-frequency signal acquisition device.
Further, for the convenience of understanding, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings:
as shown in fig. 1, the invention provides a high-voltage cabtyre flexible cable fault positioning early warning system based on clock synchronization, which comprises a monitoring server (with built-in monitoring software), a clock synchronization communication box, a clock synchronization monitoring terminal, a high-frequency signal acquisition device and a low-frequency signal acquisition device.
The monitoring server and the clock synchronization communication box are arranged in a ground monitoring center and adopt industrial Ethernet communication. The clock synchronization junction box is communicated with the underground clock synchronization monitoring terminal through optical fibers and carries out clock synchronization. And the clock synchronization monitoring terminals communicate and synchronize clocks by adopting optical fibers. The clock synchronization monitoring terminal is arranged beside the high-voltage switch cabinet and the junction box. Each clock synchronization monitoring terminal can be connected with two high-frequency signal acquisition devices and two low-frequency signal acquisition devices. The high-frequency signal acquisition device and the low-frequency signal acquisition device are in a group and are arranged near a wiring horn mouth of the high-voltage switch cabinet or a wiring horn mouth of the junction box. The high-frequency signal acquisition device is used for detecting high-frequency signals generated by the ignition and discharge signals, and the low-frequency signal acquisition device is used for detecting unbalanced load current, short-circuit current and power frequency phase. And the monitoring software carries out fault early warning and locates the fault by analyzing the data uploaded by the clock synchronization monitoring terminal.
The clock synchronization function is realized between the clock synchronization communication box and the clock synchronization monitoring terminal through optical fiber communication. The clock synchronization communication box is a master device, and the clock synchronization monitoring terminal is a serial slave node device. The clock synchronization communication box is connected with each subsequent clock synchronization monitoring terminal in series. The clock synchronization communication box pair is in clock synchronization with the first synchronous monitoring terminal; each clock synchronous monitoring terminal carries out time service by the last slave synchronous monitoring terminal through a protocol message; each synchronous monitoring terminal supports a network switching function, and a hand-in-hand mode is arranged between each synchronous monitoring terminal and each synchronous monitoring terminal to form a cascade switching network;
the high-frequency signal acquisition device adopts an open type waterproof design, is arranged at the wiring position of a junction box or a high-voltage switch cabinet and is used for acquiring high-frequency signals. The frequency response range of the device is 100 KHz-80 MHz.
The low-frequency signal acquisition device adopts an open type waterproof design, is arranged at the wiring position of a junction box or a high-voltage switch cabinet and is used for acquiring low-frequency signals. The frequency response range of the device is 1Hz to 100 KHz.
The clock synchronization monitoring terminal comprises a clock synchronization communication unit and a signal processing unit. The clock synchronization communication unit completes the communication function, completes the clock synchronization on the clock bus and transmits the accurate clock information to the signal processing unit. The signal processing unit receives signals from the high-frequency signal acquisition device and the low-frequency signal acquisition device, and uploads the acquired data to the monitoring server through the clock synchronization communication unit after signal conditioning, AD conversion, time stamping, digital filtering and signal classification screening.
The monitoring server is combined with monitoring software to complete the functions of data communication, data analysis, data storage and fault early warning. The monitoring server communicates with the time synchronization communication box through the industrial Ethernet and receives the data collected by the clock synchronization monitoring terminal. The data comprises partial discharge information of the high-voltage rubber jacketed flexible cable, discharge information in the junction box, fire information in the junction box, short-circuit current information, phase information, unbalanced current information and interference data. The monitoring software completes the functions of pulse signal identification, signal source identification, fault signal classification, fault positioning, early warning and alarming. The monitoring software compares the collected signal characteristics with a fault fingerprint library, and accurately classifies partial discharge of the cable, overhigh humidity of the junction box, poor contact of junction box junction terminals, faults of the junction box junction terminals, short circuit between cable phases and short circuit of the cable to the ground.
In this embodiment, the high frequency signal acquisition device and the low frequency signal acquisition device are a group and are installed near the wiring bell mouth of the high voltage switch cabinet or near the wiring bell mouth of the junction box. The device is used for collecting electric signals formed by phenomena such as partial discharge of a cable, overhigh humidity of a junction box, poor contact of junction box wiring terminals, faults of the junction box wiring terminals, short circuit between cable phases, short circuit of the cable to the ground and the like.
Furthermore, the clock synchronization monitoring terminal receives signals from the high-frequency signal acquisition device and the high-frequency signal acquisition device, and uploads the acquired data to the time synchronization communication box through the clock synchronization communication unit after signal conditioning, AD conversion, time stamping, digital filtering and signal classification screening.
And the further clock synchronization communication box completes communication with the clock synchronization terminal through the optical fiber and completes clock synchronization. And communicates with the monitoring server via an industrial ethernet. And uploading the data acquired by the clock synchronization terminal to a monitoring server, and issuing a command of the monitoring server to the clock synchronization monitoring terminal.
Furthermore, the monitoring server combines the monitoring software to complete the functions of data communication, data analysis, data storage and fault early warning. The monitoring server communicates with the time synchronization communication box through the industrial Ethernet and receives the data collected by the clock synchronization monitoring terminal. The monitoring software compares the collected signal special type with a fault fingerprint library, and accurately classifies cable partial discharge, overhigh humidity of the junction box, poor contact of junction box junction terminals, faults of the junction box junction terminals, cable interphase short circuit and cable ground short circuit. The operating state of the cable is then displayed and stored. When the fault occurs, early warning and alarm prompt are carried out.
Further, the work flow of the system is shown in fig. 2 and fig. 3:
the monitoring software in the system has two major parts: and (4) forming a fingerprint library and monitoring in real time. Firstly, experimental data are collected to carry out machine learning training to form a fingerprint database. And then, judging and classifying the working conditions of the cables and the junction boxes by taking a fingerprint database as a basis in real-time monitoring.
The system collects high-frequency signals and low-frequency signals under working conditions of cable partial discharge, overhigh humidity of a junction box, poor contact of a junction box wiring terminal, junction box wiring terminal fault, cable alternate short circuit, cable ground short circuit and the like in an experimental environment and a field working condition environment, and forms a monopulse characteristic fingerprint library and a phase characteristic pulse diagram fingerprint library through machine learning.
The formation process of the single-pulse characteristic fingerprint library is as follows: after high-frequency signals and low-frequency signals under various specified working conditions are collected, time domain characteristics and frequency domain characteristics of the monopulse signals are extracted. The time domain characteristics are divided into rise time, hold time, attenuation coefficient and the like; the frequency domain features are divided into equivalent frequency and energy distribution. And then, performing machine learning training on the features to finally form a single-pulse feature fingerprint library corresponding to each working condition.
Because many interference signals under complex working conditions have similar or even identical characteristics on time domain characteristics and frequency domain characteristics with the above specified working conditions, a phase pulse characteristic fingerprint library needs to be formed for further identification.
The phase pulse characteristic fingerprint library forming process is as follows: after high-frequency signals and low-frequency signals under various specified working conditions are collected, the time stamps of the monopulse signals are extracted, and then corresponding time is converted into power frequency phases. Further, a phase distribution pulse intensity graph is drawn by taking the power frequency phase as an abscissa and the signal intensity as an ordinate of the plurality of single pulse signals. And then, performing machine learning training on the phase distribution pulse intensity graph to finally form a phase pulse characteristic fingerprint library.
In the real-time monitoring work, after the software receives the data uploaded by the clock synchronization monitoring terminal, single-pulse signal identification is carried out firstly. The identification of the monopulse signals refers to the extraction of time domain characteristics and frequency domain characteristics of the single pulse signals, then the comparison of the time domain characteristics and the frequency domain characteristics of the newly acquired signals with a pulse signal fingerprint database, the identification of the monopulse signals, the preliminary removal of interference signals and the extraction of suspected fault pulse signals.
And further performing homologous signal identification on the suspected fault pulse signal. The homologous signal identification is to calculate the similarity of a certain number of suspected fault pulse signals in the time domain and the frequency domain, and pack the signals with the similarity higher than a certain set threshold value into a group as an analysis unit. Because the signals generated by the same signal source have similar characteristics after passing through the same transmission path, the signals generated by the same signal source can be packed into a group for the next step of signal type identification through the identification of the same source signal.
The signal type identification is to compare a group of signals generated by the same signal on a phase distribution pulse intensity diagram with a phase pulse characteristic fingerprint library formed under various working conditions to obtain the similarity of the group of signals and the phase distribution pulse intensity diagram under various working conditions, thereby judging whether the group of signals is in an abnormal working condition. If the signal is abnormal, an alarm is generated and the danger degree is prompted.
Further, the positioning process is shown in fig. 4
When an abnormal signal occurs, the system software selects the same time of discharge signal from the signals detected by two adjacent clock synchronization monitoring terminals by using a clock synchronization technology, and then positions a fault point. The positioning algorithm is illustrated as follows: when a fault occurs at the point C of the high-voltage circuit, the initial traveling wave of the signal generated at the fault point C is transmitted to the two ends along the line at the speed v. When the clock synchronization monitoring terminals are respectively installed at M, N, the time when the wave head of the initial travelling wave reaches M, N is assumed to be tM、tN. According to t measured by the deviceM、tNThe distance L from the fault point to the monitoring points at two ends can be calculatedM、LNComprises the following steps:
example two:
the embodiment aims to provide a high-voltage cabtyre flexible cable fault positioning early warning method based on clock synchronization.
A high-voltage rubber jacketed flexible cable fault positioning early warning method based on clock synchronization is based on the high-voltage rubber jacketed flexible cable fault positioning early warning system based on clock synchronization, and comprises the following steps:
acquiring high-frequency and low-frequency signals acquired by the clock synchronization monitoring terminal, and acquiring signal characteristics based on a built-in characteristic extraction model;
and comparing the acquired signal characteristics with a fault fingerprint database, and calculating a result based on the similarity to realize positioning and early warning of the fault.
Those of ordinary skill in the art will appreciate that the various illustrative elements, i.e., algorithm steps, described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The high-voltage rubber jacketed flexible cable fault positioning early warning system and method based on clock synchronization can be realized, and have wide application prospects.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A high-voltage rubber jacketed flexible cable fault positioning early warning system based on clock synchronization is characterized by comprising a monitoring server and a clock synchronization monitoring terminal, wherein the monitoring server and the clock synchronization monitoring terminal are communicated through a clock synchronization communication box;
the clock synchronization communication box is connected with a plurality of clock synchronization monitoring terminals in series through optical fibers, and a cascade switching network is formed among the synchronization monitoring terminals;
the clock synchronization monitoring terminal is used for receiving signals from the high-frequency signal acquisition device and the low-frequency signal acquisition device, processing the signals and uploading the processed signals to the monitoring server; the high-frequency signal acquisition device and the low-frequency signal acquisition device are arranged at the wiring position of a junction box or a high-voltage switch cabinet;
the monitoring server is used for receiving the high-frequency and low-frequency signals collected by the clock synchronization monitoring terminal and acquiring signal characteristics based on a built-in characteristic extraction model; meanwhile, based on the comparison between the acquired signal characteristics and a fault fingerprint database, the positioning early warning of the fault is realized.
2. The high-voltage cabtyre cable fault positioning early warning system based on clock synchronization as claimed in claim 1, wherein the clock synchronization communication box is clock-synchronized with a first clock synchronization monitoring terminal connected thereto; and each clock synchronous monitoring terminal carries out time service through the protocol message by the synchronous monitoring terminal on the clock synchronous monitoring terminal, and each synchronous monitoring terminal supports the network switching function.
3. The high-voltage cabtyre flexible cable fault positioning early warning system based on clock synchronization as claimed in claim 1, wherein after the monitoring server receives the collected high-frequency and low-frequency signals, the specific processing procedure comprises:
firstly, identifying a single pulse signal, and extracting a suspected fault pulse signal;
carrying out homologous signal identification on suspected fault pulse signals, and packaging signals generated by the same signal source;
and comparing a group of signals generated by the same signal source with a phase pulse characteristic fingerprint library formed under various working conditions on a phase distribution pulse intensity diagram, and judging whether the group of signals are abnormal working conditions or not based on similarity calculation.
4. The high-voltage cabtyre flexible cable fault positioning early warning system based on clock synchronization as claimed in claim 3, wherein when judging that an abnormal working condition occurs, the same time of discharge signal is selected from the signals detected by two adjacent clock synchronization monitoring terminals by using clock synchronization technology, so as to realize the positioning of a fault point.
5. The high-voltage cabtyre flexible cable fault positioning early warning system based on clock synchronization as claimed in claim 1, wherein the fault fingerprint database comprises a single pulse characteristic fingerprint database and a phase characteristic pulse pattern fingerprint database, and the generation of the fault fingerprint database specifically comprises:
collecting high-frequency signals and low-frequency signals under different working conditions; extracting time domain characteristics and frequency domain characteristics of the monopulse signals, training the obtained characteristics through a machine learning algorithm, and forming monopulse characteristic fingerprint libraries corresponding to different working conditions;
alternatively, the first and second electrodes may be,
after high-frequency signals and low-frequency signals under different working conditions are collected, extracting a timestamp of a single-pulse signal, and converting corresponding time into a power frequency phase; and drawing a phase distribution pulse intensity graph by taking the power frequency phase of the single pulse signals as an abscissa and the signal intensity as an ordinate, and then performing machine learning training on the phase distribution pulse intensity graph to finally form a phase pulse characteristic fingerprint library under different working conditions.
6. The high-voltage cabtyre flexible cable fault positioning early warning system based on clock synchronization as claimed in claim 1, wherein said clock synchronization monitoring terminal comprises a clock synchronization communication unit and a signal processing unit, and the clock synchronization communication unit is used for realizing communication function, completing clock synchronization on a clock bus and transmitting accurate clock information to the signal processing unit; the signal processing unit is used for receiving signals from the high-frequency signal acquisition device and the low-frequency signal acquisition device.
7. The high-voltage cabtyre cable fault location early warning system based on clock synchronization as claimed in claim 6, wherein said signal processing unit is further used for processing received signal conditioning, AD conversion, time stamping, digital filtering and signal classification screening, and uploading the processed data to the monitoring server through the clock synchronization communication unit.
8. The high-voltage cabtyre flexible cable fault positioning early warning system based on clock synchronization as claimed in claim 1, wherein said high frequency signal acquisition device is used for detecting high frequency signals raised by ignition and discharge signals, and said low frequency signal acquisition device is used for detecting load unbalanced current, short circuit current and power frequency phase signals.
9. The high-voltage cabtyre flexible cable fault positioning early warning system based on clock synchronization as claimed in claim 1, wherein said high-frequency signal acquisition device and low-frequency signal acquisition device both adopt open type waterproof design.
10. A clock synchronization-based high-voltage cabtyre cable fault location early warning method, which is based on the clock synchronization-based high-voltage cabtyre cable fault location early warning system of any one of claims 1 to 9, and comprises:
acquiring high-frequency and low-frequency signals acquired by the clock synchronization monitoring terminal, and acquiring signal characteristics based on a built-in characteristic extraction model;
and comparing the acquired signal characteristics with a fault fingerprint database, and calculating a result based on the similarity to realize positioning and early warning of the fault.
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