Electric transmission line inducted voltage restraint device based on impedance adjustment

Abstract

The invention provides an electric transmission line inducted voltage restraint device based on impedance adjustment. A voltage measuring module (1), an automatic switching disconnecting link (2), an impedance module (3) and a current measuring module (4) are sequentially connected in series. The output end of the current measuring module (4) and the output end of the voltage measuring module (1) are connected with the input end of the impedance adjustment control system (5) in parallel; the output end of an impedance adjustment control system (5) is connected with the input end of the automatic switching disconnecting link (2); the output end of an air cooling system (6) is connected with the input end of the impedance module (3). The electric transmission line inducted voltage restraint device based on impedance adjustment automatically adjusts impedance values, eliminates the effect of inducted voltages of electric transmission lines with different voltage classes, types and lengths on a direct-current ice melting device, is simple in structure, free of maintenance, small in size, low in manufacturing cost and free of manual switching, and eliminates personnel electric shock hazards.

Description

technical field [0001] The invention belongs to the technical field of electrical engineering, and relates to a device for suppressing induced voltage of transmission lines based on impedance adjustment. Background technique [0002] Since 2008, in order to fight against the ice disaster encountered by transmission lines, my country has developed a large number of DC ice melting devices and put them into the ice melting of transmission lines to ensure the safe and stable operation of the power grid. At present, the rectification technologies adopted by DC ice melting devices include uncontrollable diode rectification and controllable thyristor rectification. However, since the ice-melting circuit of the transmission line is not grounded, the DC ice-melting device cannot rectify the induced voltage generated by the double-circuit line on the same tower. To eliminate the influence of induced voltage on the rectifier circuit of the DC ice melting device, there are two common m...

AI Technical Summary

Problems solved by technology

However, since the ice-melting circuit of the transmission line is not grounded, the induced voltage generated by the double-circuit line on the same tower cannot rectify the DC ice-melting device

To eliminate the influence of induced voltage on the rectifier circuit of the DC ice-melting device, there are two common methods: one is to cut off the entire line of the same tower and common pole line to eliminate the induced voltage. Production and life of local people

The other is to increase the voltage level of the rectifier element of the rectifier circuit of the DC ice-melting device, which doubles the cost of the ice-melting device; and the transmission lines have different voltage levels, models and lengths, which makes the device transformation impossible.

As a result, a large number of domestic DC ice melting devices cannot be put into operation due to this technical problem

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