Development of a distribution transformer not subject to destructive failure. Final report

Technical Report · Thu Jul 01 04:00:00 EDT 1982

OSTI ID:5199144

Sokoly, T O; Ghinazzi, J M; Baranowski, J F; Goedde, G L

Conventional distribution transformer insulations include a formvar-type coating on the copper wire, kraft paper barriers between the layers of wire and kraft paper barriers between sections, all saturated with a dielectric oil. The combination of the mechanical, electrical, and thermal properties of the insulation systems makes this an efficient effective composite for use in the millions of distribution transformers on line today. A deficiency of this system is the occasional occurrence of destructive failures by these transformers in the field. For a number of reasons the insulations can break down electrically or thermally. The arcing produced can generate gases which greatly increase the pressure within the enclosure and can blow off the cover, bushings, or rupture the tank. Hot and sometimes burning oil ejected by such failures of pole-mounted and pad-mounted transformers can result in property damage, environmental contamination, or personal injury. Corrective measures to reduce or eliminate those types of failures such as strengthened tanks, pressure relief valves and current limiting fuses have not always been entirely successful or cost effective. The substitution of inorganic high temperature insulations for the oil-paper system in present transformer designs was studied. Various types of ceramic, glass, and other inorganic materials were studied. Processing techniques necessary to apply these materials to a transformer were developed. A variety of design configurations for the transformer were studied, with emphasis on developing processing methods needed for the use of presently available materials.

• Research Organization: McGraw-Edison Co., Franksville, WI (USA)
• OSTI ID: 5199144
• Report Number(s): EPRI-EL-2484; ON: DE82905814
• Country of Publication: United States
• Language: English

Related Subjects

200300* -- Electric Power Engineering-- Power Transmission & Distribution-- (-1989)
24 POWER TRANSMISSION AND DISTRIBUTION
36 MATERIALS SCIENCE
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ASBESTOS
CERAMICS
DATA
DESIGN
DIELECTRIC MATERIALS
DIELECTRIC PROPERTIES
ELECTRICAL EQUIPMENT
ELECTRICAL INSULATION
ELECTRICAL PROPERTIES
ENERGY SYSTEMS
EQUIPMENT
EXPERIMENTAL DATA
FABRICATION
FAILURES
GLASS
HIGH TEMPERATURE
INFORMATION
INSULATING OILS
MATERIALS
MECHANICAL PROPERTIES
NUMERICAL DATA
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PAPER
PHYSICAL PROPERTIES
POWER SYSTEMS
POWER TRANSMISSION LINES
TEMPERATURE DEPENDENCE
THERMAL INSULATION
TRANSFORMERS