A double-conductor insulated ground wire for overhead lightning protection that can melt ice

Abstract

The invention relates to an overhead lightning protection double conductor insulated grounding wire capable of melting ice, so as to solve the ice coating problem of the overhead grounding wire. Ice melting and snow removing can be realized with minimal cost input, and in the case of a lightning strike or line fault, a transmission phase line can be protected from being damaged, and the overhead grounding wire itself is intact. In the technical scheme of the invention, the grounding wire comprises a conductive magnetic body inner layer, a composite insulated layer and a conductive magnetic body outer layer sequentially from inside to outside, wherein the conductive magnetic body inner layer is formed by stranding multiple galvanized steel wires; the composite insulated layer is formed by an insulated inner layer, a main insulated layer and an insulated outer layer in a covering mode, and the insulated inner layer and the insulated outer layer are semi conductive layers; the conductive magnetic body outer layer is formed by stranding multiple galvanized steel wires and coats the insulated outer layer; and the galvanized steel wire adopts soft magnetic steel wire galvanization. The overhead lightning protection double conductor insulated grounding wire capable of melting ice is applicable to lightning protection and ice melting of a high voltage overhead transmission line grounding wire in a power system.

Description

technical field [0001] The invention relates to an overhead lightning protection double-conductor insulated ground wire capable of melting ice. It is suitable for lightning protection and ice melting of the ground wire of high-voltage overhead transmission lines in power systems. Background technique [0002] Since 2008, there have been rare low-temperature rain and snow freezing disasters in the history of southern my country. The icing of many lines far exceeds the capacity of the lines, causing large-scale disconnection or downed towers. The ground wire erected above the transmission line is usually fixed on the top of the line iron tower. During the period of icing, the conductor and ground wire of the transmission line will be covered with ice. Since the overhead ground wire is higher than the conductor, and under the normal operation of the transmission line There is no current flowing through the overhead ground wire, and the ice thickness of the overhead ground wir...

AI Technical Summary

Problems solved by technology

Relevant studies have shown that the induced charge on the ground has an important impact on the formation of the upward leader on the ground, thereby affecting the ability of the ground to induce lightning

However, under the condition that the ground wire is fully insulated, the induced charge on the ground wire will decrease, that is, the entire wire insulation of the ground wire will affect the induction aggregation of the ground wire, and lead to poor lightning protection ability of the ground wire.

[0007] 4) In order to reduce the power loss on the ground wire, if the power department fully insulates the ground wire, the field strength on the overhead ground wire will be smaller than the electric field strength on the transmission wire under this connection mode. The air gap between the overhead ground wire and the tower cannot be broken down to ground the ground wire. 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 will become the head-on leader, resulting in lightning strikes and shielding of the transmission line. Faults will have a great impact on the safe and stable operation of the system

[0008] Due to the above reasons, in order to prevent the lightning falling on the ground wire from counterattacking the conductor, it is necessary to arrange manual work to restore the ground wire in the minefield to ground again in the season when there is no ice covering. The line maintenance workload in this process is very huge

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