Lightening-breakage-preventing medium-voltage insulating wire
An insulated wire and lightning protection technology, applied in the direction of insulated conductors, insulated cables, conductors, etc., can solve the problems of broken wires and unsatisfactory effects, and achieve the effects of reasonable structure, improved strength and good working performance.
Inactive Publication Date: 2013-09-11
STATE GRID CORP OF CHINA +2
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Problems solved by technology
The current method used is to install zinc oxide arresters, discharge intervals, lightning arrestors or coupled ground wires on the medium-voltage insulated conductors to prevent medium-voltage insulated conductors from being broken due to overvoltage in the atmosphere. These measures are passive and have little effect. Ideal, but frequent disconnection accidents
Method used
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Embodiment Construction
[0009] A medium-voltage insulated wire for lightning strike protection, including a steel core composed of multiple strands of steel wire, the steel core is covered with an aluminum wire layer, the surface of the aluminum wire layer is coated with aluminum chloride or ammonium chloride, and the aluminum wire is wrapped Insulation layer.
[0010] The cross-sectional area of the steel core is 16-25 square millimeters; the cross-sectional area of the aluminum conductor is 50-300 square millimeters; the combination of such sizes is very beneficial to the improvement of working performance.
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Abstract
The invention discloses a lightening-breakage-preventing medium-voltage insulating wire which comprises a steel core formed by stranded steel wires. An aluminum wire layer is wrapped outside the steel core. Aluminum chloride or ammonium chloride is coated on the surface of the aluminum wire layer. An insulating layer is wrapped outside the aluminum wire layer. The lightening-breakage-preventing medium-voltage insulating wire is reasonable in structure and good in working performance. Due to the fact that the aluminum chloride or ammonium chloride, which is easy to sublimate under heat, is coated on the surface of the aluminum wire layer used for conducting, during disruptive discharge of the medium-voltage insulating wire, sublimation, under high temperature, from solid to gas brings away a huge amount of heat, and temperature of discharge points is lowered.
Description
technical field [0001] The invention relates to a medium-voltage insulated wire for preventing wire breakage caused by lightning strikes. Background technique [0002] The wide application of medium-voltage insulated wires in power systems is mainly determined by its advantages. It can well solve the contradiction between trees and wires, especially the big problem of urban landscape greening, power line passages and safe operation of power lines. However, it also has a fatal weakness. When the power line is discharged by atmospheric overvoltage (lightning strike), it will be disconnected. After the disconnection, it will seriously affect the stable operation of the power system. The bigger problem is to affect the lives and property safety of the surrounding people. This again limits his application prospects. His disconnection mechanism is as follows: When the medium-voltage insulated wire line is subjected to atmospheric overvoltage, if the insulation cannot meet the req...
Claims
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IPC IPC(8): H01B9/02H01B7/02H01B7/42H01B7/22H01B7/29H01B7/17
Inventor 孙德斌
Owner STATE GRID CORP OF CHINA
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