CASTING METHOD FOR PRODUCING A PROTECTIVE SHEATH AROUND A SURGE ARRESTER AND A CASTING MOULD THEREFOR

摘要

A casting method producing a protective sheath around a surge arrester having a cylindrical discharge element between end fittings and retaining rods clamped into the fittings and surrounding the discharge element, includes placing the arrester into a first mold, pouring casting compound around the arrester to mold on a supporting part inwardly around the discharge element and outwardly around the rods, curing the compound to fix the rods and discharge element, removing the arrester with the supporting part from the first mold and placing it into a second mold, pouring compound around the arrester with supporting part forming a shield part shaped as protective sheath and curing the compound. A first casting mold has first recesses around rods of an inserted arrester. The rods and discharge element are fixed by a supporting part molded on during the first casting and cannot be bent or displaced during subsequent casting.