DC VOLTAGE/CURRENT HEATING/GELLING/CURING OF RESIN ENCAPSULATED DISTRIBUTION TRANSFORMER COILS

An internal heating method for drying, gelling and final curing of epoxy res in insulation systems used for encapsulating dry type cast distribution transformer coils is disclosed. The internal method uses a Direct-Current (D C) power source to control and supply DC current to resistively heat the t...

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Bibliographische Detailangaben
Hauptverfasser:	SARVER, CHARLES H, HORTON, RUSH B., JR, WHITE, MICHAEL D, YOUNGER, HAROLD, LANOUE, THOMAS J
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	BASIC ELECTRIC ELEMENTS ELECTRICITY GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS INDUCTANCES MAGNETS SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION TECHNICAL SUBJECTS COVERED BY FORMER USPC TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TRANSFORMERS
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Beschreibung
Zusammenfassung:	An internal heating method for drying, gelling and final curing of epoxy res in insulation systems used for encapsulating dry type cast distribution transformer coils is disclosed. The internal method uses a Direct-Current (D C) power source to control and supply DC current to resistively heat the transformer coil encapsulated with a liquid resin under vacuum in a mold. DC current is applied to a given coil based on its conductor cross-sectional ar ea and its epoxy resin quantity to achieve a specified temperature for drying, gelling and final curing. The temperature, controlled by DC resistive heatin g is maintained for a given period for each step.