Abstract
Galloping of overhead transmission lines (OHTLs) may induce conductor breakage and tower collapse, and there is no effective method for long distance distribution on-line galloping monitoring. To overcome the drawbacks of the conventional galloping monitoring systems, such as sensitivity to electromagnetic interference, the need for onsite power, and short lifetimes, a novel optical remote passive measuring system is proposed in the paper. Firstly, to solve the hysteresis and eccentric load problem in tension sensing, and to extent the dynamic response range, an ‘S’ type elastic element structure with flanges was proposed. Then, a tension experiment was carried out to demonstrate the dynamic response characteristics. Moreover, the designed tension sensor was stretched continuously for 30 min to observe its long time stability. Last but not the least, the sensor was mounted on a 70 m conductor model, and the conductor was oscillated at different frequencies to investigate the dynamic performance of the sensor. The experimental results demonstrate the sensor is suitable for the OHTL galloping detection. Compared with the conventional sensors for OHTL monitoring, the system has many advantages, such as easy installation, no flashover risk, distribution monitoring, better bandwidth, improved accuracy and higher reliability.
Highlights
Overhead transmission lines (OHTLs) are an important part of a power grid which suffer from the impact of complex meteorological and geographical conditions [1,2,3]
When a tension variation caused by galloping applied on the elastic element of the optical tension sensor, the optical strain gauges mounted on the surface of the grooves are subjected to different strains which induces fiber Bragg grating (FBG) wavelength shifts are equal in value but opposite in direction
A novel optical passive measuring system is proposed for monitoring the galloping of overhead transmission lines by using the OPGW transmission
Summary
Overhead transmission lines (OHTLs) are an important part of a power grid which suffer from the impact of complex meteorological and geographical conditions [1,2,3]. (3) Tensions can be used to obtain the galloping behaviors of phase conductors [3], and conventional voltage sensors based on strain gauges are located between insulators and towers [14]. In China, many optical fiber composite overhead ground wires (OPGWs) have been installed above phase conductors, especially on the high voltage transmission lines. If we want to link the sensors in [22,23] with an OPGW for remote and distribution sensing, an optical fiber must be located near the insulator surface which reduces the flashover voltage of the insulator and may induce an interruption of power supply. Compared with the sensor described in [24], the accuracy of the proposed sensor is much higher, because an elastic element structure with flanges was designed to solve the hysteresis and eccentric load problem in traditional tension sensors of the column type, and to extend the dynamic response range
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