Method and device for taking power from high-voltage transmission lines based on capacitive reactance matching shunt control

Abstract

The invention discloses a method and device for taking power from a high-voltage transmission line based on capacitive reactance matching shunt control. A magnetic core with an air gap is placed on the power transmission cable, and a certain capacitance value is connected to the secondary winding of the magnetic core. The matching capacitor C constitutes a damping branch. On the transmission cable at both ends of the magnetic core, the load is connected to the high-voltage transmission cable through a fixture through a shunt line to form an energy-taking branch. By setting the capacitance value, the equivalent excitation of the magnetic core Parallel resonance of the inductor causes the equivalent impedance of the damping branch to increase significantly, thereby dividing the bus current into the energy-taking branch, increasing the current of the energy-taking branch and decreasing the current of the damping branch, so as to provide high-power electric energy through the energy-taking branch. The invention is not affected by weather and climate; the overall power-taking volume is small, easy to install, can take out a large power from the power transmission bus, can continuously and stably provide sufficient electric energy to the online monitoring equipment of the power transmission line, and improve the on-line monitoring of the power transmission line device reliability.

Description

technical field [0001] The invention relates to a power supply technology for real-time on-line monitoring equipment of a high-voltage transmission line, in particular to a method and device for taking power from a high-voltage transmission line based on capacitive reactance matching shunt control. Background technique [0002] In the power grid, extensive real-time monitoring of the insulator leakage current, ice thickness, temperature and load of the high-voltage overhead transmission line can detect and eliminate faults in the transmission line in time, which is of great significance to the safety and stability of the power system. However, the power supply for real-time monitoring equipment of high-voltage transmission lines is not easy to obtain, and this has always been an important problem that limits the wide application of online real-time monitoring of transmission lines. At present, conventional energy supply methods include battery power supply, solar power suppl...

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Problems solved by technology

The battery power supply can only supply power for low-power devices for a long time, and it is not suitable for the situation where the power supply power reaches tens of watts, and the battery charge and discharge life is limited, and the battery needs to be replaced regularly; solar power supply is greatly affected by the weather and environment, and the output The power fluctuation is large, so it is difficult to apply to the power supply requirements of large-scale online monitoring equipment; the conventional current transformer power supply is to put the open-gap current transformer on the transmission line, and the electromagnetic induction of the bus current acts on the circuit transformer to induce electric energy. In order to facilitate installation, this method uses an air-gapped current transformer, and the magnetic core permeability of the open-air-gapped current transformer will be extremely reduced, and the power induced by the secondary coil will be very small. Generally only about 1W

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