High voltage transmission line power taking method and device based on capacitive reactance matching shunt control

Abstract

The invention discloses a high voltage transmission line power taking method and device based on capacitive reactance matching shunt control. An air gap magnetic core is inserted into a power transmission cable, and a matching capacitor C with certain capacitance value is connected with the secondary winding of the magnetic core to form a damping branch. On the power transmission cable on both ends of the magnetic core, a load is connected with the high-voltage power transmission cable through a shunt line through a clamp to form an energy taking branch. By setting the capacitance value to enable the equivalent excitation inductor of the magnetic core to carry out parallel resonance, the equivalent impedance of the damping branch is significantly increased, and the bus current is divided into the energy taking branch. The current of the energy taking branch is increased, and the current of the damping branch is decreased to provide high-power electrical energy through the energy takingbranch. According to the invention, the method and device are not affected by weather and climate; the overall power taking volume is small, so that the installation is easy; the device can take a large amount of power from a transmission bus, and can continuously and stably provide sufficient power for the online monitoring equipment of a transmission line; and the reliability of the online monitoring equipment of the transmission line is improved.

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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