CN115128399A - Multi-channel on-line monitoring and fault positioning method for power optical cable network - Google Patents
Multi-channel on-line monitoring and fault positioning method for power optical cable network Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35338—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using other arrangements than interferometer arrangements
- G01D5/35354—Sensor working in reflection
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
- G01M11/31—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter and a light receiver being disposed at the same side of a fibre or waveguide end-face, e.g. reflectometers
- G01M11/3109—Reflectometers detecting the back-scattered light in the time-domain, e.g. OTDR
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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Abstract
The invention relates to the technical field of power equipment detection, in particular to a multi-channel on-line monitoring and fault positioning method for a power optical cable network. When an optical cable breaks down, the attenuation of an optical signal is increased sharply at a broken circuit position, an OTDR optical time domain reflectometer is used for obtaining the position of the broken circuit point of the optical cable through the attenuation of a photometric signal, the broken circuit point of the optical cable is marked on a power grid GIS map, and an optical cable line or a tower joint box near the broken circuit point of the optical cable is marked on the power grid GIS map for auxiliary positioning; therefore, the efficiency of locating and removing faults of the optical cable is improved, the operation maintenance and overhaul efficiency of faults of the power grid optical cable is improved, and the reliability of the power optical fiber communication network is improved.
Description
Technical Field
The invention relates to the technical field of power equipment detection, in particular to a multi-channel on-line monitoring and fault positioning method for a power optical cable network.
Background
With the comprehensive construction of the smart power grid, the production and operation services of the power grid are increasing day by day, the service bearing conditions of a single set of equipment and a single optical cable are becoming concentrated day by day, and the system operation risk possibly caused by the fault of the single equipment and the single optical cable is increased. In the traditional optical cable line maintenance management mode of optical cable detection based on instruments such as OTDR (optical time domain reflectometer), monitoring equipment consists of a plurality of parts, the reliability is not high, the response speed to faults is determined by people, and the fault finding is very difficult; the fault removing time is long, the fault locating capability is poor, hidden dangers cannot be predicted, and the normal work of a communication network is influenced. The monitoring of the optical transmission equipment mainly depends on a professional network management system provided by each equipment manufacturer, and the optical transmission equipment is poor in universality and difficult to be compatible with equipment of manufacturers. The efficiency of on-site detection of faults such as optical cable breakpoints is low, the current normal transmission service needs to be interrupted, long-term and real-time monitoring is difficult to realize, long-term change statistics of optical cable parameters cannot be mastered, emergency repair after the faults can only be realized, and advance early warning cannot be realized. How to monitor, maintain and manage the optical cable intelligently and intensively by using limited maintenance manpower becomes more important.
Fiber optic fault maintenance monitoring approaches have evolved in pace with the scaled application of optical communications, going through a process from simple to sophisticated, from manual to gradual automation, from primary personal experience to more and more ancillary tools. The earliest optical cable fault maintenance is mainly carried out in a mode of fault declaration of a user and telephone confirmation of a maintainer, and can be positioned to an optical cable and an optical core where a fault point is located; with the improvement of the operation and maintenance requirements of the optical fiber communication network, fault location is performed in physical modes such as an optical fiber shearing method, an insertion method, a bending method and a freezing method, and the defects are that the optical fiber is physically damaged or damaged, the workload is large and the location time is long. Recently, an optical fiber fault detection pen has appeared, which emits red laser visible to human eyes, and locates a fault point by checking light leakage of the fault point. The device is small, portable and convenient to carry, and the emitted red test laser can still be clearly visible after penetrating through a 3mm PVC layer. The latest OTDR test method based on the optical time domain reflection principle does not damage the physical optical core any more. But still has the limitations of poor positioning accuracy, offline monitoring, high requirement on operators, failure early warning and the like.
Disclosure of Invention
The invention provides a multi-path on-line monitoring and fault locating method for solving the defects of the prior art, provides an optical cable fault locating technology based on power grid GIS application for accurately locating an optical cable fault occurrence point aiming at the problems that the geographic spatial position of the power communication optical cable fault point is difficult to judge and the first-aid repair time is influenced.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the multi-channel on-line monitoring and fault positioning method for the power optical cable network comprises the following steps:
s1, determining the accurate position of the fault point
When an optical cable breaks down, the attenuation of an optical signal is increased sharply at a broken circuit position, an OTDR optical time domain reflectometer is used for obtaining the position of the broken circuit point of the optical cable through the attenuation of a photometric signal, the broken circuit point of the optical cable is marked on a power grid GIS map, and an optical cable line or a tower joint box near the broken circuit point of the optical cable is marked on the power grid GIS map for auxiliary positioning;
s2, determining the pole points of the nearest surplus cables
And when the fault of the optical cable line is eliminated, selecting the residual cables through the marked optical cable line or the tower joint box, welding the fault points and the residual cables, and marking the welding points as the fault points.
In step S1, the OTDR optical time domain reflectometer receives signals through the ethernet interface, tests the optical fiber cable, a laser in the OTDR optical time domain reflectometer sends optical pulse signals with corresponding wavelengths to the optical fiber, the signals scattered and refracted by the optical fiber enter receiving modules such as a coupler to perform photoelectric conversion and signal conditioning, and then enter an AD conversion module to perform analog/digital conversion to confirm a fault point.
The OTDR optical time domain reflectometer in step S1 is used in cooperation with a 1310nm, 1490nm, 1550nm, 1625nm, or 1650nm laser.
In step S1, the OTDR optical time domain reflectometer is used in an optical cable standby state or an offline state in cooperation with a 1310nm, 1490nm, or 1550nm laser.
In the step S1, the OTDR optical time domain reflectometer is used in cooperation with a 1625nm or 1650nm laser in an online state of the optical cable.
The multiple channels are 8, 16 or 32 channels, the power of optical signals on the multiple optical fibers is monitored by testing the optical power of multiple ports in turn, and collected optical power data are transmitted to a computer through an RS232 port.
The invention provides a method for on-line monitoring and fault positioning of optical transmission equipment, which constructs a multi-channel OTDR real-time monitoring prototype and provides a solution of a key technology for improving detection precision. The method comprises the steps that the multi-channel OTDR real-time online monitoring technology is adopted, and the real-time detection and trend analysis of the optical power received by a transmission network element are combined, so that the whole-line real-time monitoring of the power optical cable and the diagnosis and early warning of a fault optical cable are realized; aiming at the problems that the geographic spatial position of a power communication optical cable fault point is difficult to judge and the emergency repair time is influenced, an optical cable fault positioning technology based on power grid GIS application is provided, and an optical cable fault occurrence point is accurately positioned, so that the optical cable fault positioning and removing efficiency is improved, the operation and maintenance efficiency of the power grid optical cable fault is improved, and the reliability of a power optical fiber communication network is improved.
Detailed Description
The multi-channel on-line monitoring and fault positioning method for the power optical cable network comprises the following steps:
s1, determining the accurate position of the fault point
When an optical cable breaks down, the attenuation of an optical signal is increased sharply at a broken circuit position, an OTDR optical time domain reflectometer is used for obtaining the position of the broken circuit point of the optical cable through the attenuation of a photometric signal, the broken circuit point of the optical cable is marked on a power grid GIS map, and an optical cable line or a tower joint box near the broken circuit point of the optical cable is marked on the power grid GIS map for auxiliary positioning;
s2, determining the rod point of the nearest surplus cable
And when the fault of the optical cable line is eliminated, selecting the residual cables through the marked optical cable line or the tower joint box, welding the fault points and the residual cables, and marking the welding points as the fault points.
In step S1, the OTDR optical time domain reflectometer receives signals through the ethernet interface, tests the optical fiber cable, a laser in the OTDR optical time domain reflectometer sends optical pulse signals with corresponding wavelengths to the optical fiber, the signals scattered and refracted by the optical fiber enter receiving modules such as a coupler to perform photoelectric conversion and signal conditioning, and then enter an AD conversion module to perform analog/digital conversion to confirm a fault point.
The OTDR optical time domain reflectometer in step S1 is used in cooperation with a 1310nm, 1490nm, 1550nm, 1625nm, or 1650nm laser.
In step S1, the OTDR optical time domain reflectometer is used in an optical cable standby state or an offline state in cooperation with a 1310nm, 1490nm, or 1550nm laser.
In the step S1, the OTDR optical time domain reflectometer is used in cooperation with a 1625nm or 1650nm laser in an online state of the optical cable.
The multiple channels are 8, 16 or 32 channels, the power of optical signals on the multiple optical fibers is monitored by testing the optical power of multiple ports in turn, and collected optical power data are transmitted to a computer through an RS232 port.
The OTDR is a measuring instrument for characterizing the transmission characteristics of optical fibers, which is not only time-saving and convenient to measure, but also non-destructive, thus being widely applied in the production and on-site laying of optical fibers and optical cables, and being an essential measuring instrument in the optical fiber and optical communication technology.
The OTDR is the most basic testing tool in the construction and maintenance work of optical cables, and can realize the unidirectional test of optical fiber links, the loss distribution condition in single-end test optical cables and the positions of all joints. The test contents comprise (1) loss test, transmission loss (including part) and connection loss, (2) distance test, connection point and abnormal point distance, and (3) return loss test (point and interval).
The multichannel OTDR (optical time Domain Reflectometer) module sends laser pulses to an optical fiber by utilizing an optical time domain reflection principle, and receives and measures the intensity and time of continuous optical reflection signals along the optical fiber to obtain an optical fiber reflection test curve reflecting the length and attenuation change of the optical fiber, so that a monitoring center can analyze and process the length, attenuation, joint loss, and accurate position and amplitude of faults.
Since rayleigh scattering exists at any point in the optical fiber, the intensity of this scattering is the same for each direction, and when a part of the scattered light satisfies the transmission condition in the core direction, the scattered light can be folded back to the incident end of the optical fiber, which is the back-scattered light, i.e., rayleigh scattered light. OTDR is made based on the back-scattering properties of the fiber.
The laser converts the electric pulse signal with the period of T generated in the detection signal generator into an optical pulse signal meeting the requirement, and the optical pulse signal is sent to the optical fiber to be detected through the combiner. After a period of time, a portion of the optical signal is reflected back to the instrument, where it includes the backscattered light and fresnel reflected light at the fiber connector, fiber splice, and fiber termination end, and is returned to the receiver through the combiner. The detector records the time-related backward light signal continuously, and displays the information of the backward light on a display according to the distance, and the data of the length of the measured optical fiber, the positions of the connector and the joint, the loss and attenuation of the joint and the like can be determined according to the curve.
The measurement range of the OTDR is also the dynamic range of the OTDR, which is defined as the dB difference between the originating backscatter level and the noise. The measurement range is an important indicator of OTDR and determines how long the instrument can measure. The size of the measurement range depends on factors such as the instrument's optical pulse power, width, wavelength, and noise at the receiver. The distance of the measurable optical fiber is determined by the fact that an optical pulse signal generates attenuation when transmitted in the optical fiber, the attenuation is larger when the optical pulse signal is transmitted farther, and the signal-to-noise ratio (S/N) is too small after the optical pulse signal is transmitted to a certain distance, so that the signal cannot be distinguished from noise. The dynamic range is large, so that a certain loss value resolution can be kept at a longer distance, and the dynamic range is small, so that the loss value resolution begins to deteriorate at a shorter distance, and the resolution capability of the events such as joint loss is reduced.
The power of the light pulses emitted by the optical sources of an OTDR can generally be divided into an average power and a peak power. The magnitude of the average power is related to the pulse width parameter (or duty cycle) set by the OTDR, and at the same peak value, the larger the pulse width or duty cycle, the larger the average optical power, and vice versa, the smaller the average optical power. In the maintenance test, the average optical power is measured as soon as the optical power is measured, and the measured value is generally small. When an OTDR is used to test the transmission characteristics of an optical fiber line, only the average power is generally concerned. When the attenuation of the measured optical fiber line is constant, the larger the average power is, the larger the measurement range is correspondingly.
The power grid geographic information system is an application system which integrates inquiry statistics, operation maintenance, analysis management and customer service functions into a whole by describing the structure, the attribute, the power user information and the real-time information of a power distribution network on a geographic background map according to the actual geographic position of the power distribution network by using a computer technology and a network technology. Since the distribution GIS is constructed and the Automatic Mapping function and the distribution equipment Management function are also established, the distribution GIS is generally represented by an AM/FM/GIS (Automatic Mapping/Facility Management/Geographic Information System).
AM/FM/GIS is the basis for various automatization of power supply and distribution systems. The GIS is characterized in that by taking geographic information as a background, the graphic and the database are combined to describe and manage parameter attributes of various electric devices and operation control information in a power grid. In the off-line aspect, the AM/FM/GIS is mainly applied to an equipment management system and a planning and designing system; in the online application, the AM/FM/GIS is mainly combined with the SCADA system, and the operation data and the graphic data are mutually exchanged to provide accurate power grid geographic information for a dispatcher; in addition, the system can also be used as a complaint telephone hot line system of the DMS, quickly and accurately judge the fault place and the current position of the emergency maintenance team according to the fault complaint telephone of the user place, and timely dispatch emergency maintenance personnel to shorten the power failure time. For example, the established 'distribution network geographic information management system' provides a practical distribution network data comprehensive automatic management tool for urban offices, so that the distribution production management working level is greatly improved, and the practical functions of the AM/FM/GIS system in the aspects of design, engineering, scheduling, power utilization, distribution network automation and the like are actively developed. The' Wuhan power supply bureau AM/FM/GIS system established by the Wuhan power supply bureau is a distribution GIS system with the first distributed structure and the largest scale in the whole country.
Based on the wide application and important function of the GIS, GIS application research is carried out in the maintenance and guarantee of the optical cable line for communication, the application research can enable the management of the optical cable line to keep pace with the development of science and technology, a geographic information data database of the optical cable line for communication is further established, various data and data of the optical cable line are further analyzed and summarized, and operation and maintenance personnel can know the condition of the optical cable line more vividly, intuitively and conveniently. The method provides a management platform, a database and auxiliary decision information for the optical cable communication line, provides visual and accurate basis for realizing rapid first-aid repair, engineering construction and the like of the optical cable line, and simultaneously provides a new exploration and method for scientifically managing the information of the communication optical cable line.
A plurality of movable joints are installed on the optical cable lines during construction and are connected through flanges, and the purpose of increasing the number of access lines is mainly achieved, and the access lines can be flexibly switched. However, the optical cable line connector is easily loosened, and the transmission signal is polluted, which affects the accuracy of data transmission. And secondly, artificial damage faults are divided into two conditions of intentional damage and accidental damage, wherein the occurrence rate of the intentional damage is low, the proportion of the accidental damage is large, most of the accidental damage occurs in urban areas, and the optical cable is dug or scraped due to urban construction. Thirdly, the optical fiber is interconnected by using a prefabricated optical fiber circuit and a plug, and if the optical fiber is not fixed firmly, the jumper fault is easily caused.
Data such as optical cable lines, connector boxes and the like are arranged in a power grid geographic information system in a radiating mode and are visually displayed on a map, so that non-professional optical cable maintenance personnel can quickly check the trend of the optical cable lines in the region of the jurisdiction, and the optical cable fault occurrence point can be accurately positioned.
And fault positioning and inquiring functions such as equipment positioning and inquiring, area inquiring, tree inquiring, line inquiring, mutual image inquiring, line addressing, equipment counting, drawing of statistical diagrams and the like. Data such as optical cable lines, pole tower joint boxes and the like are visually displayed on a power grid GIS map, and non-professional optical cable maintenance personnel can quickly check the trend of the optical cable lines in the region of the jurisdiction to which the non-professional optical cable maintenance personnel belong through the map and accurately position the fault occurrence point of the optical cable.
The system adopting the multi-channel OTDR optical cable monitoring scheme has simple structure and flexible configuration and is suitable for the requirements of different monitoring optical cables. Because each tested optical fiber is monitored by the independent OTDR, the real-time performance and the integrity of optical fiber monitoring can be extremely high, and roll calling test and other tests on a plurality of optical fibers can be supported.
Different settings can be carried out on the operation parameters of each channel by configuring PC end software, and each submodule can freely select proper working wavelength, dynamic range, measuring mode and the like, so that the measurement is more accurate and rapid. The multi-path OTDR module is composed of several independent OTDR submodules, and thus, the performance of the OTDR submodules is critical.
The system adopting the multi-channel OTDR optical cable monitoring scheme has simple structure and flexible configuration, and is suitable for the requirements of different monitoring optical cables. Because each tested optical fiber is monitored by the independent OTDR, the real-time performance and the integrity of optical fiber monitoring can be extremely high, and roll calling test and other tests on a plurality of optical fibers can be supported. Different settings can be carried out on the operation parameters of each channel by configuring PC end software, and each submodule can freely select proper working wavelength, dynamic range, measuring mode and the like, so that the measurement is more accurate and rapid.
The monitoring acquisition and statistical analysis functions of the optical power are one of the core functions of a monitoring station system, and play an important role in analyzing the test data of the OTDR. The optical power monitoring module (OPM) is internally provided with an optical splitter module, the optical power on-line monitoring adopts the optical splitter to split the working light of the optical transmission equipment by 3 percent, and the optical power change is monitored in the access alarm acquisition module, so that the real-time monitoring of the working light is realized, the transmission characteristic of the optical fiber is reflected in real time, and the change of the transmission quality is found in time. The threshold of each optical power monitoring channel can be set, when the monitored optical fiber is broken, the working optical power is reduced to a certain threshold value or is greatly attenuated, an instant alarm is generated, the system immediately activates the OTDR to test the core wire, and accurate fault judgment and positioning are carried out. In the monitoring mode, a Wavelength Division Multiplexing (WDM) technology and corresponding devices are adopted to realize the simultaneous transmission of a communication light source and an OTDR test light source in one fiber core. In the monitoring mode, the test light wavelength of the OTDR should be 1625nm or 1650 nm.
And monitoring the optical power spare fiber, namely monitoring the spare fiber in an off-line test mode by adopting an optical power alarm module so as to realize real-time alarm monitoring of the optical power. Because the monitoring of the spare fiber does not have a signal source from the transmission equipment, the testing mode must add a light source at the end of the monitoring route, send the optical signal to the spare fiber, and then perform optical power detection at the testing end. When the fiber core is abnormal, the light source signal is blocked or weakened, the system immediately activates the OTDR to test the core wire, and accurate fault judgment and positioning are carried out.
The multi-path optical power module monitors the power of optical signals on the optical fibers by continuously testing the optical power of the multi-path ports in turn. The collected optical power data is transmitted to a computer through an RS232 port, so that the collection of the optical power is mainly to control the collection of the optical power module to the optical signal power according to the optical power module configuration table, and then whether to generate an alarm is determined according to the comparison of the collected data and the parameters of threshold setting and the like of the optical power module configuration table. And when an alarm is generated, the OTDR is automatically started to carry out testing.
The optical power monitoring module monitors the optical power on the optical cable in real time and finds faults such as broken fibers, attenuation increase and the like in the transmission process in time. And the optical power statistical analysis module analyzes and summarizes the optical power data according to the optical power data collected by the optical power monitoring module and the analysis requirement of the user, and finally presents the optical power data to the user in the form of an analysis report.
The main faults of the optical cable are as follows:
1) partial system blocking failure: due to the aging of the optical cable, the optical cable is a gradual change process and is not easy to find, or the optical fiber in the optical fiber box has a fault (the fracture in the optical fiber box is mostly mirror fracture and has a larger Fresnel reflection peak);
2) full resistance fault of the optical cable: for the full-resistance fault of the optical cable line, the fault is generally caused by external force. The current searching method is that OTDR is used to measure the distance between the fault point and the station (station), and combines with maintenance data to determine the geographical position of the fault point, and command the line patrol personnel to check whether construction is available or not along the optical cable route, and whether the overhead optical cable has obvious strain, distortion, break point, fire and the like, so as to find out the fault point;
3) failure due to excessive fiber attenuation: much due to bending losses. The reserved optical fiber discs in the box are improperly left or the heat shrinkable tube falls off to form a small ring, so that the curvature radius of the residual fibers is too small. In addition, the water entering the joint box also causes the fault at the joint.
4) Machine room line terminal fault: generally, the artificial faults caused by personnel such as construction, transformation, relocation and cutting are caused in a machine room, or caused by joint aging, tail fiber aging and the like.
1) The invention provides a multi-channel OTDR real-time on-line monitoring method, which uses a phase-shifting sampling technology and a bias adjustable and trans-resistance variable receiver technology to improve the performance of an OTDR submodule and realize the high-stability and high-precision optical cable on-line monitoring function, and combines the real-time detection and trend analysis of the optical receiving power of a transmission network element to realize the whole-line real-time monitoring and diagnosis of a circuit cable and the quick alarm of a fault optical cable.
The project applies a power grid optical cable data model and a data import method, data such as optical cable lines, connector boxes and the like are arranged in a GIS system in a radiating mode and are visually displayed on a map, an intelligent waveform identification function is achieved, an operation method is simplified, more complex parameters do not need to be set, and the method is convenient for people who are not good at OTDR instrument testing to use.
Claims (6)
1. The multi-channel on-line monitoring and fault locating method for the power optical cable network is characterized by comprising the following steps of:
s1, determining the accurate position of the fault point
When an optical cable breaks down, the attenuation of an optical signal is increased sharply at a broken circuit position, an OTDR optical time domain reflectometer is used for obtaining the position of the broken circuit point of the optical cable through the attenuation of a photometric signal, the broken circuit point of the optical cable is marked on a power grid GIS map, and an optical cable line or a tower joint box near the broken circuit point of the optical cable is marked on the power grid GIS map for auxiliary positioning;
s2, determining the pole points of the nearest surplus cables
And when the fault of the optical cable line is eliminated, selecting the residual cables through the marked optical cable line or the tower joint box, welding the fault points and the residual cables, and marking the welding points as the fault points.
2. The multi-channel online monitoring and fault locating method for the power optical cable network according to claim 1, wherein in step S1, the OTDR optical time domain reflectometer receives signals through the ethernet interface, tests the optical fiber cable, a laser in the OTDR optical time domain reflectometer sends optical pulse signals of corresponding wavelengths to the optical fiber, signals scattered and refracted by the optical fiber enter receiving modules such as a coupler for photoelectric conversion and signal conditioning, and then enter an AD conversion module for analog/digital conversion to confirm a fault point.
3. The method for multi-channel on-line monitoring and fault location of optical power cable network as claimed in claim 1, wherein the OTDR optical time domain reflectometer in step S1 is used with 1310nm, 1490nm, 1550nm, 1625nm or 1650nm laser.
4. The multi-channel online monitoring and fault location method for electrical power optical cable networks according to claim 1, wherein in step S1, the OTDR optical time domain reflectometer is used in conjunction with 1310nm, 1490nm or 1550nm laser in standby state or offline state of optical cable.
5. The method for multi-channel online monitoring and fault location of an optical power cable network as claimed in claim 1, wherein the OTDR optical time domain reflectometer in step S1 is used in cooperation with 1625nm or 1650nm laser in the online state of the optical cable.
6. The method for on-line monitoring and fault location of multiple paths of the power optical cable network as claimed in claim 1, wherein the multiple paths are 8, 16 or 32 paths, the power of the optical signals on the multiple optical fibers is monitored by testing the optical power of multiple paths of ports in turn, and the collected optical power data is transmitted to a computer through an RS232 port.
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