On-line monitoring system and method for distributed sag of composite optical fiber overhead ground wire

Abstract

An on-line monitoring system and method for distributed sag of a composite optical fiber overhead ground wire is designed in the invention and comprises a distributed optical fiber temperature and strain demodulation instrument, a distributed optical fiber sensor and a computer system and information processing unit, wherein the distributed optical fiber temperature and strain demodulation instrument and the computer system and information processing unit are arranged in a transformer substation machine room, the distributed optical fiber sensor is a sensing optical fiber in the composite optical fiber overhead ground wire, a communication end of the distributed optical fiber sensor is connected with a sensor communication end of the distributed optical fiber temperature and strain demodulation instrument via an interface in the transformer substation machine room, and a signal output end of the distributed optical fiber temperature and strain demodulation instrument is connected with a signal input end of the computer system and information processing unit. According to the On-line monitoring system and method, no sensor needs to be mounted on an OPGW; instead, a composite optical fiber ground wire is used as the sensor; sag detection of the whole composite optical fiber ground wire in a power transmission line can be realized based on an OPGW sag distribution model via detection of strain and temperature of the power transmission line.

Description

technical field [0001] The present invention relates to the technical field of electric power operation and maintenance, in particular to a distributed online sag monitoring system and method for Optical Fiber Composite Overhead Ground Wire (OPGW). technical background [0002] Sag measurement plays an important role in the safe operation of the control line, especially after a period of operation of the new line, the ground wire will sag to varying degrees. For safety, it is necessary to observe the sag Records to provide reliable data for the safe operation of the power grid; if the sag of the line does not meet the specified requirements, if it is too large or too small, it may cause disconnection and grounding faults due to the stress of the line exceeding the allowable value, and even damage the tower structure or windshield where the wire is erected. Cycloidal blowing causes short circuit, arcing and tripping accidents. Therefore, the sag inspection of conductors and ...

AI Technical Summary

Problems solved by technology

[0003] But at this stage, the sag measurement of the ground wire is basically judged by the naked eye based on the experience of the line inspectors, and the observation is only carried out in special cases; although there are some online sag monitoring methods, they all need to be measured at each span of the line. Each sensor can only monitor the sag of one span. These methods are complex in construction and the sensors are easily damaged by the environment.

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