Optical Fiber Vibration Sensor and Breeze Vibration Monitoring System for Transmission Line Using It

Abstract

The invention relates to an optical fiber vibrating sensor and a power transmission line aeolian vibration monitoring system applying the same. The optical fiber vibrating sensor comprises a fixed body, a constant-strength beam and a contact body arranged on a lead wire, wherein the fixed body, the constant-strength beam and the contact body are connected in sequence. The fixed body is connected with the lead wire through a clamp arranged on the lead wire, and the upper and lower surfaces perpendicular to the axis of the constant-strength beam are symmetrically provided with fiber bragg gratings. The sensor is installed by adopting an upright method of hull section construction, and an installing point is a fatigue dangerous point of a ground conductive wire. The monitoring system comprises the optical fiber vibrating sensor, an optical fiber composite overhead ground wire, a wave-length adjusting device and a host machine which are connected in sequence. The sensor and the monitoring system have the advantages of being high in measuring accuracy, high in speed, good in frequency response, stable in long-term performance and the like, the problem that the prior art susceptible to influence of complicated electromagnetic environment, measuring accuracy, poor flexible, large size and poor system stability, cannot achieve field information transfer in real time and the like is solved, and the stability and reliability of the system are improved.

Description

Technical field: [0001] The invention relates to the technical field of on-line monitoring, and more specifically relates to an optical fiber vibration sensor and a power transmission line breeze vibration monitoring system using the sensor. Background technique: [0002] The breeze vibration of transmission line conductor is due to the excitation of wind, which causes the conductor to resonate in the vertical plane, forming a regular wave reciprocating motion up and down. The range of wind speed where vibration occurs is generally 0.5-10m / s, the vibration frequency is generally 3-150Hz, the maximum double amplitude is generally not greater than 1-2 times the diameter of the wire, generally several hours, sometimes up to several days, high-frequency slight amplitude Breeze vibrations are the most frequent, causing different degrees of dynamic bending stress on the conductors, which can easily cause conductor fatigue and broken strands, fatigue damage or wear of fittings, spa...

AI Technical Summary

Problems solved by technology

[0007] The above existing sensor measurement results need to be transmitted to the monitoring center through wireless means. Due to the unstable wireless communication signal, the vibration measurement results cannot be transmitted.

[0008] Aiming at the problems that the vibration sensors existing in the above-mentioned existing overhead transmission lines require on-site power supply, are easily affected by complex electromagnetic environments, have poor measurement accuracy and sensitivity, large volume, poor system stability, and cannot transmit on-site information in real time, the application of the present invention is proposed

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