Surge Arrester With Overvoltage Sensitive Grounding Switch with Overvoltage-Sensing Ground Switch

摘要

A surge arrester for protecting power distribution equipment from overvoltage has a varistor as an active surge arresting element. When a continuous overvoltage occurs, the amorphous conductor electrically connected in series with the varistor is heated to or above a critical temperature at which the tensile strength is significantly reduced. The amorphous metal conductor breaks, closing the switch to form a permanent short to ground, and performing the overcurrent protection operation of the network to de-energize the arrestor and related unprotected equipment and cause a permanent or permanent power frequency overvoltage condition And protecting electrical network equipment from damage and / or damage to insulation.