Lightning protection and deicing device of ground wire on high voltage overhead power transmission line

Abstract

The invention relates to a lightning protection and deicing device of a ground wire on a high voltage overhead power transmission line, and aims at comprehensively solving the problem occurring on the ground wire so that the overhead ground wire is enabled to have lightning protection and also have the functions of communication optical fibers, deicing and snow removing, energy conservation and loss reduction and field power taking. The technical scheme is the lightning protection and deicing device of the ground wire on the high voltage overhead power transmission line. The lightning protection and deicing device is provided with the ground wire erected on a tower. Insulators are connected between the tower and the ground wire. The ground wire is composed of an internal conductor, an insulting layer and an external conductor. The internal conductor is directly connected with the tower. The external conductor is connected with the tower through the insulators. The external conductor and the insulators are connected and installed on a lightning protection unit of the bottom part of the tower through a high voltage connecting cable. The other end of the lightning protection unit is grounded. The lightning protection unit is bridged between the insulators of the two sides of the tower, and an electric reactor is connected in parallel on the lightning protection unit. The lightning protection and deicing device is suitable for safety and energy conservation of power system line engineering.

Description

Technical field [0001] The invention relates to a lightning protection and ice melting device for ground wires on high-voltage overhead transmission lines. It is suitable for the safety and energy saving of power system circuit engineering. Background technique [0002] Such as figure 1 As shown, the installation of lightning protection ground wire on the transmission line is one of the most basic lightning protection measures for power transmission lines. The ground wire has the following functions in terms of lightning protection: 1) Prevent lightning from directly striking the conductor; 2) Lightning protection when lightning strikes the top of the tower The current plays a role of shunting, reducing the lightning current flowing into the tower and reducing the potential on the top of the tower; 3) It has a shielding effect on the wire, and when the lightning cloud invades, it can reduce the induced overvoltage on the wire. In addition to the above-mentioned functions of the ...

AI Technical Summary

Problems solved by technology

[0003] 1) Since the ground wire is generally erected on the top of the tower, it is easier to form ice in winter. Once the ice layer is too thick, it will cause the tower to fall to the ground, the ground wire will break, and the conductor and ground wire will be short-circuited and grounded. In the event of a line outage

[0004] 2) In overhead lines, since the distance from the ground wire to each phase wire is generally not equal, the mutual inductance between them will also be different. Although the load current on the three-phase wires is balanced under normal circumstances, but A longitudinal electromotive force is still induced on the ground wire. If the ground wire is connected to the ground of each iron tower, this electromotive force will generate current to flow into the ground, and the result is to increase the power loss of the line.

However, in order to reduce the power loss on the ground wire, if the entire ground wire is insulated, under this connection, the field strength on the overhead ground wire will be smaller than that on the transmission wire. If the air gap between the ground wire and the tower makes the ground wire grounded, since the electric field strength on the transmission wire is greater than the field strength of the ground wire at this time, the transmission wire becomes the head-on leader, resulting in lightning shielding, and the lightning protection effect cannot be achieved. Transmission line faults have a great impact on the safe and stable operation of the system

Images