Research on transmission line dance analysis and monitoring technology based on fiber optic sensor

Abstract

Transmission line dance is mainly caused by meteorology, geography, line structure and other factors, etc. Effective monitoring of transmission lines is conducive to ensuring the stable operation of the power system. The article analyzes the transmission line ice-covered dance based on the influence mechanism, the single degree of freedom, and the three degrees of freedom of the transmission line dance modeling. Combined with ANSYS software, the finite element model of the transmission line is designed, and the boundary conditions and loads of the model are set. The characteristics of transmission line dancing under different initial wind attack angles, wind speeds, and stall distances are analyzed by simulation software. A transmission line dance monitoring system was set up using distributed fiber optic sensing technology, and a tensile ice and temperature simulation experiment was devised to confirm its effectiveness. When the initial wind attack angle is 200° at the midpoint of the gear spacing, the amplitude of the dance in the torsional direction is only 0.25°, and the amplitude of the dance in the vertical direction reaches 3.62 m. The critical wind speed interval for the dance of the transmission line is 5~7 m/s. Under the condition of the transmission line overlying ice, the line is pulled off when the wire pulling force is 120% of the RTS, and the value of Brillouin frequency shift fluctuates between 10.03 GHz and 10.38 GHz. Fluctuating between. Fiber optic sensors are capable of monitoring the ice-covering stress and temperature changes of transmission lines and providing support for timely and effective measures against dancing.