The 15kV Lightning Arrestor Standalone Assembly guards against the very high potential difference that may develop between a Central Office incoming cable sheath and substation ground due to a lightning strike or Ground Potential Rise. In the event of an over-voltage caused by a lightning strike inside the Zone of Influence of a power substation, the 15kV lightning arrestor will begin to conduct and drain the lightning surge to the substation ground grid. The Model #751126/1 15kV Lightning Arrestor Assembly clamps the electrical potential induced by a lightning strike to 15kV until the surge decays. Once the voltage surge decays below the firing point of the lightning arrestor, the lightning arrestor ceases to conduct.
The Non-Fragmenting Lightning Arrestor used in the Model 751126/1 assembly guards against the very high potential difference that may develop between a Central Office (CO) incoming cable shield and station ground due to a lightning strike or Ground Potential Rise (GPR). In the event of an over voltage, the arrestor limits the voltage between the sheath and station ground to its breakdown voltage.
The unit consists of the non-fragmenting lightning arrestor, in a small, compact enclosure. The enclosure is molded from fiberglass, making it a lightweight, flame retardant product of high dielectric strength. Its fiberglass body limits the possibility of many kinds of infiltration (of dust, mist, and water from sprinklers) while providing reliable isolation from external ground potentials. In the event of an arrestor failure, the core’s polymer housing does not fragment as a porcelain housing would. This results in less danger to adjacent personnel and equipment. The unit is lightweight, and installs easily between the CO incoming cable and a Teleline Isolator shelf or HVI assembly.