Surge protective method by self-control surge current triggered gap discharge

Abstract

The method consists of the assistant discharging circuit containing a group of trigger electrodes setup between protected circuits or devices and a ground electrode and the main discharging circuit containing a main discharging gap. The characters of the invention are that the distance setting between the trigger electrode and the main discharging gap is based on following consideration. The assistant discharging circuit containing trigger electrodes sets the overvoltage threshold. When voltage is higher than the threshold, electric surge current flows through the trigger pole to the ground electrode. The current passing through the trigger pole sets the current threshold. When current is larger than the current threshold, electric arc is generated and electric discharge happens in main discharging gap.

Description

technical field [0001] The invention relates to a surge protection technology, in particular to a surge protection method using gap discharge. Background technique [0002] Lightning activities, various operating overvoltages, and actions of electromagnetic pulse weapons, these powerful electromagnetic, voltage, and current changes instantaneously, generate various surge overvoltages and overcurrents on the surrounding conductors, and give electrical and electronic equipment, circuits harm and loss to people's lives and property. [0003] Through long-term practice, people have invented various surge protection devices to prevent losses caused by surges. For example, from the initial air gap to the current varistor, gas discharge tube, semiconductor discharge tube and the surge protection device formed by the simple combination of them, they have made great contributions to the protection against lightning and other surges. [0004] However, the above-mentioned components ...

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Problems solved by technology

[0007] Disadvantages: a. Slow response time (greater than 100ns to ms level); b. Harmful follower current; c. Performance parameters are easily affected by the environment; d. Short life; e. Large inter-electrode capacitance

[0010] Disadvantages: a. The residual voltage is relatively high; b. The use exceeding the rated current capacity may cause an explosion; c. The inter-electrode capacitance value is large, which is not suitable for lightning protection of high-frequency lines; d. There is leakage current, which is easy to Ageing;

[0013] Disadvantages: a. Small flow rate (hundreds of amperes); b. Short circuit effect when damaged

Its advantages: it can have a large flow capacity; its disadvantages: according to the introduction, the response time can reach more than 100ns; the trigger ignition voltage is too high, and it is not easy to control, the precision is low, and the residual voltage value is high; the gap distance is small, and it is easy to produce harmful Follow the current; the ignition voltage above several thousand volts cannot be applied to the protection of precise signal lines and antenna feeder lines at all; due to the limitation of trigger materials, it is also difficult to apply to high voltages above several thousand volts or even tens of thousands or hundreds of thousands of volts line

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