Abstract: An induction crucible furnace includes a housing having a bottom wall and side walls which define a furnace cage. A prefabricated refractory crucible made of a mixture of a dry ramming material, a sintering agent and a cold-curing binder is disposed within the furnace cage with a clearance which is filled with a non-sintering granular material sealed within the furnace with a patching compound. A plurality of induction coils are disposed within the furnace cage and are separated from a layer of the non-sintering granular material by a heat-protective layer. In a method of manufacturing of the induction crucible furnace a refractory crucible is placed onto a bed of a non-sintering granular material disposed on the bottom wall of the furnace housing.

Abstract: A measuring transformer for a fully-insulated, metal-clad, high-voltage installation equipped with a metal outer tube containing a high-voltage conductor includes a tube member arranged within the metal outer tube in surrounding relation to the high-voltage conductor. The tube member constitutes a surface-type electrode an conjointly defines with the high-voltage conductor a high-voltage capacitor. A low-voltage capacitor is connected to the high-voltage capacitor so as to conjointly define therewith a capacitive voltage divider. A transformer core unit including an iron core and a transformer winding system mounted on the iron core is also provided. The transformer core unit is arranged on the outer surface of the tube member whereby the tube member carries the transformer core unit inside the metal outer tube of the high-voltage installation.

Abstract: A voltage transformer for an insulated high-voltage switching apparatus of the type including a metallic outer tubular casing in which an electrical conductor is disposed, and a tubular sleeve disposed about the conductor within the casing. The sleeve forms both a surface type electrode and in conjunction with the electrical conductor of the apparatus, a high potential capacitor. The improvement of the invention comprises a coupling arrangement, fabricated of electrical insulation material, which is fastened at one end of the tubular sleeve and is coupled to the casing of the apparatus. A support arrangement, also fabricated of electrical insulation material, is fastened at the other end of the tubular sleeve and disposed in engagement with the inner surface of the apparatus casing. The coupling and support arrangements function in conjunction with each other to support the tubular sleeve in the apparatus casing about the electrical conductor.