Self-cutting follow current lightning arrester

Abstract

The invention discloses a self-cutting follow current lightning arrester. An outer glue sleeve of a traditional lightning arrester, an insulation cylinder, an upper electrode and a lower electrode are used for forming a sealed cavity. A main discharging gap and an auxiliary discharging gap which are connected through a lead are arranged in the cavity. In the main discharging gap, an insulation partitioning plate with a through hole is arranged in a partitioning mode. A coil wound on a magnetic rod is connected in parallel to the two ends of the auxiliary gap. When lightning waves come, high-voltage electricity enters from a lightning arrester lead, the main discharging gap and the auxiliary discharging gap are broken down at the same time, and lightning current is discharged into the ground. Power frequency follow current frequency is far lower than thunder and lightning equivalent frequency, so that power frequency follow current can pass a magnet exciting coil which cannot be passed by lightning current, the magnetic rod generates magnetic force to pull down the insulation partitioning plate, an arc at the main discharging gap is cut off, and power frequency follow current generates magnetic force to cut off the power frequency follow current. Then, under the effects of a spring and a limiting plate, the self-cutting follow current lightning arrester returns to the position before discharging and is prepared for next thunder and lightning.

Description

technical field

[0001] The invention mainly relates to the field of electric power, in particular to a self-cutting freewheeling arrester for electric power systems. Background technique

[0002] In recent years, almost all power system surge arresters use metal oxide valve plates as their central components, which have excellent protection characteristics in limiting various lightning and operating overvoltages. However, the weight of the metal oxide valve plate accounts for most of the entire arrester, which increases the weight of the arrester. In addition, the price of the metal oxide valve plate is too high, which brings a certain economic burden to the user; in addition, the valve plate in The heat generated under the action of AC exceeds its heat dissipation capacity and the heat balance loss of control occurs from time to time, which will cause potential safety hazards. Moreover, the valveless surge arrester has been invented. The operation of the equipment is troub...

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