Abstract:
Surge arrester spark gap assemblies for use within surge voltage arrester devices employ the gap electrode structure to direct the arc current flow.
Abstract:
A surge arrester including an outer porcelain housing and an ablative heat shield liner is disclosed herein along with a number of techniques for making the surge arrester break resistant. In accordance with one of these techniques, a blow out or relief valve is provided on at least one end of the arrester housing for venting internal pressure due to electrical arcing therein. In this embodiment, an arrangement is provided for preventing the components therein from escaping during the venting procedure. The liner is constructed of a material which is sufficiently ablative to produce its own gas within the housing in response to electrical arcing therein.
Abstract:
A surge voltage lightning arrester ground lead disconnector utilizes a refractory metal coating on the explosive cartridge to provide a thermal delay to the arcing that occurs during disconnector operation. The thermal delay insures the explosion of the cartridge and promotes venting the arrester housing.
Abstract:
A heat transfer arrangement for zinc oxide varistors comprises a metal heat sink disk held in contact with one face of the varistor by means of a circumferential elastic sleeve. The heat generated within the varistor rapidly conducts into and is absorbed by the metal disk and transmits through the elastic sleeve to the environment. When the varistor heat sink assembly is mounted within a surge voltage arrester, a flexible positioning member holds the assembly tightly against the arrester housing for transferring the heat to the housing.
Abstract:
Surge voltage arresters are provided with a frangible housing to cause the housing to break at a predetermined section into a relatively few pieces upon varistor failure. The breaking of the housing deters excessive pressure buildup within the arrester.
Abstract:
A lightning arrester of the station class is equipped with a ceramic housing protective heat shield liner formed of an ablative material capable of giving off a gas when subjected to a fault current arc. The evolved gas contributes to a rapid internal pressure buildup calculated to rupture housing end sealing diaphragms and quickly vent the arrester housing interior to prevent housing fracture. The arrester end structures are provided with expansive radial vents to accommodate unimpeded internal pressure relief.
Abstract:
A heat transfer system for voltage surge arresters employs a dual radius arrester housing in combination with a plurality of sleeved zinc oxide varistors to efficiently cool the varistors during operation. The sleeved varistors are held in thermal contact with a large portion of the porcelain housing. The porcelain housing provides a heat sink facility to the arrester both during normal operating and voltage surge conditions.
Abstract:
A compact voltage surge arrester employs a miniature series gap electrode arrangement in series with a plurality of zinc oxide varistors. The series gap arrangement provides the use of zinc oxide varistors without auxiliary heat sinks.
Abstract:
Flat internal components of an arrester are stacked longitudinally inside the insulating housing cylinder with a perimeter portion contacting the inside wall of the housing. Each component has a guide channel extending longitudinally on its perimeter portion opposite the portion in contact with the wall. A resilient rolling bias member is disposed in the channel of each component in a deformed stressed state and forces the components laterally against the wall.