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While the steel and coating may be capable of withstanding higher temperatures, it will come in contact with insulating materials with limited temperature capabilities. In larger units, cooling ducts are used inside the core for additional convective surface area, and sections of laminations may be split to reduce localized losses. The core is held together by, but insulated from, mechanical structures and is grounded to a single point in order to dissipate electrostatic buildup. The core ground location is usually some readily accessible point inside the tank, but it can also be brought through a bushing on the tank wall or top for external access.
Jefferson City, MO. 2 Vacuum Processing With the coil still warm from the bonding process, transformers are held at a high vacuum while oil flows into the tank. The combination of heat and vacuum assures that all moisture and all air bubbles have been removed from the coil, providing electrical integrity and a long service life. Factory processing with heat and vacuum is impossible to duplicate in the field or in most service facilities. Transformers, if opened, should be exposed to the atmosphere for minimal amounts of time, and oil levels should never be taken down below the tops of the coils.
For single-phase applications, the windings are typically divided on both core legs as shown. 4. 3 Schematic of single-phase core-form construction. 4 Schematic of three-phase core-form construction. 5 “E”-assembly, prior to addition of coils and insertion of top yoke. constructed separate of the core and placed on their respective core legs during core assembly. 5 shows what is referred to as the “E”-assembly of a three-phase core-form core during assembly. In shell-form construction, the core provides multiple paths for the magnetic circuit.