BOTDR-based transmission line wire temperature distributed monitoring device and BOTDR-based transmission line wire temperature distributed monitoring method

Abstract

The invention relates to a BOTDR-based transmission line wire temperature distributed monitoring device and a BOTDR-based transmission line wire temperature distributed monitoring method. A BOTDR is connected with an optical fiber in an OPGW. Two variables, temperature and stress, of detection points in a transmission line OPGW are separated by a Brillouin scattering frequency shift temperature and stress demodulator; the relationship between OPGW distributed temperature and wire distributed temperature is established according to steady-state heat conduction equations of the transmission line OPGW and a wire; the convection heat radiation coefficient changing with time on the line is calculated according to monitored temperature data of the transmission line OPGW in adjacent periods of time; and the wire temperature distribution of the transmission line is calculated by a Newton iterative method based on material parameters of the transmission line OPGW and the wire and dynamic carrying capacity information of the wire measured by a transmission line wire carrying capacity monitoring system. Distributed temperature monitoring on a transmission line wire is realized. The device and the method of the invention have the beneficial effect that real-time and long-distance online temperature distribution monitoring on an OPGW and a wire of a transmission line can be realized by mounting only one piece of equipment in a substation.

Description

technical field [0001] The invention belongs to the field of electric power operation and maintenance of high-voltage transmission lines, and in particular relates to a distributed monitoring device and method for the temperature of transmission line conductors. Background technique [0002] During the normal operation of the high-voltage transmission line, the transmission wire will generate a higher temperature under the condition of high current load, which will change the sag of the transmission line during operation. If the temperature of the transmission wire rises to a certain level, it will endanger the safety of the transmission line. Normal operation, resulting in unnecessary power outages, trips and safety accidents. Therefore, the on-line monitoring of the conductor temperature of the high-voltage transmission line is an urgent problem to be solved. At present, the online monitoring method for the temperature of the high-voltage transmission line wire is mainly ...

AI Technical Summary

Problems solved by technology

At present, the online monitoring method for the temperature of the high-voltage transmission line wire is mainly realized by installing a fixed-point temperature sensor device on the wire. However, the temperature of the wire is greatly affected by the ambient temperature and wind speed, so it is distributed on the transmission line Temperature distribution, however, there is no method for monitoring the temperature of fully distributed wires in the line

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