Overhead line parallel gap protection device for power distribution network

Abstract

The invention belongs to the technical field of power distribution network overhead line protection mechanisms, and particularly relates to an overhead line parallel gap protection device for a power distribution network. The device comprises an insulator and a parallel gap protection device, and further comprises a grounding wire extending from a tower pole to the ground surface; the parallel gap protection device comprises a leading-out electrode and a mounting table, wherein the mounting table comprises a horizontal supporting plate and a control cylinder arranged on the supporting plate, the middle of the control cylinder is sleeved with a movable electrode, and a magnet 4d is arranged outside a movable electrode 4c; and a coil 4e is arranged in a control cylinder 4b, a mounting table 4 is provided with a lead-in wire 4f which is electrically connected with a conductive structure at the lower end of an insulator and the overhead transmission line, and the lead-in wire 4f is electrically connected with the movable electrode 4c. The device provided by the invention is simple in structure and convenient to disassemble and assemble, and the gap of parallel protection can be automatically adjusted according to the intensity of instantaneous current and voltage.

Description

technical field [0001] The invention belongs to the technical field of protection mechanisms for overhead lines in distribution networks, and in particular relates to a parallel gap protection device for overhead lines in a power grid. Background technique [0002] Parallel gap protection is a common protection structure for various high-voltage and high-current devices such as distribution network overhead lines and control switches. It is mainly used to prevent equipment from being damaged in abnormal situations such as lightning strikes and instantaneous high-current impacts. The basic principle is Limit the highest voltage at the front and rear ends of the equipment to prevent the voltage or current intensity from rising to the limit value (generally refers to the voltage or current level at which structural breakdown or insulation failure occurs), which can effectively prevent flashover discharge of insulators and breakdown of insulating materials and other accidents, b...

AI Technical Summary

Problems solved by technology

[0002] Parallel gap protection is a common protection structure for various high-voltage and high-current devices such as distribution network overhead lines and control switches. It is mainly used to prevent equipment from being damaged in abnormal situations such as lightning strikes and instantaneous high-current impacts. The basic principle is Limit the highest voltage at the front and back ends of the equipment to prevent the voltage or current intensity from rising to the limit value (generally refers to the voltage or current level at which structural breakdown or insulation failure occurs), which can effectively prevent flashover discharge of insulators and breakdown of insulating materials and other accidents, but the basic structure and function of the existing parallel protection gap always maintain its original mode, and the structure and function are basically unchanged compared with the early products. With the continuous development of smart grid technology and electronic technology products, It gradually distances itself from the new generation of electronic and intelligent protection devices or structures in terms of functional diversification and protection capabilities, but relatively speaking, the cost and stability of the new generation of electronic and intelligent protection devices are still significant. Insufficient, so in the process of power grid design planning or use, it is often difficult to make a choice, and there are few solutions that can take into account the two needs, reduce costs and achieve effective protection

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