Title :
On-line diagnostics of high-voltage bushings and current transformers using the sum current method
Author :
Lachman, Mark F. ; Walter, Wolf ; Von Guggenberg, Philip A.
Author_Institution :
Doble Eng. Co., Watertown, MA, USA
fDate :
1/1/2000 12:00:00 AM
Abstract :
Experience with the application of the sum current method to on-line diagnostics of high-voltage bushings and current transformers is presented. The method and analysis are described along with field experience obtained at fourteen substations, comprising 56 sets of (three) bushings and current transformers. The influences of temperature, humidity and changes in more than one bushing are discussed
Keywords :
bushings; capacitance; current transformers; electric current measurement; power transformer testing; substations; capacitance; current transformers; high-voltage bushings; humidity; on-line diagnostics; power factor; substations; sum current method; temperature; Capacitance; Current transformers; Diagnostic expert systems; Humidity; Insulators; Power systems; Reactive power; Substations; Temperature; Thermal stresses;
Journal_Title :
Power Delivery, IEEE Transactions on
