Surge arresters and method of dimensioning their arc paths

Abstract

The invention relates to an encapsulated surge arrester (2) based on a spark gap, comprising: two at least partially opposite main electrodes (4; 5) and at least one triggering or ignition auxiliary electrode (3) and present in The arc combustion chamber (6) between the main electrodes. According to the invention, the arc combustion chamber essentially consists of an insert which has in its interior at least one gap-like arc channel (7) whose gap length is a multiple of the gap height or gap diameter, And the inner part consists at least partially of a gas-releasing material, so that a release of gas into the arc channel is achieved.

Description

technical field [0001] The invention relates to an encapsulated surge arrester based on a spark gap. The invention also relates to a method for dimensioning the arc path of a surge arrester without freewheeling. Background technique [0002] It is known that overvoltage protection devices are used in electrical and information technology systems and networks for installations including protection of consumers or terminal units. [0003] Especially in the event of momentary overvoltages, such as lightning events, the overvoltage protection device limits the voltage to non-critical values. [0004] In the event of an overvoltage event, the voltage is limited by conducting a pulsed current in a transverse path and thus generally parallel to the consumer connections. Spark gaps, varistors, suppressor diodes, gas arresters, capacitors and varistors as well as combinations thereof are known as overvoltage protection devices and protective elements used here. [0005] Overvoltage...

AI Technical Summary

Problems solved by technology

[0007] However, a simple spark gap with a low protection level has the disadvantage that a grid-frequency freewheeling can occur after the pulsed current has been diverted

[0020] Finally, it should be established that the costs for avoiding freewheeling in the grid are very high, especially in the presence of low-energy and small pulse currents in the spark gap, and, in addition to the limited pulse current stability, also adversely affect the service life , protection level and emptying performance (Ausblasverhalten)

Images