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Lapp capacitor bushings for transformer and oil circuit
breaker applications are a proven design based on a
capacitor core with aluminum foils and high dielectric
paper impregnated with high dielectric epoxy resin.
Lapp PRC bushings meet all ANSI/IEEE standards for outdoor
apparatus bushings, where these standards apply, for
voltage classes 15 through 69 kV. When a transformer
application results in overload above ANSI/IEEE standards,
a bushing having a higher current rating is recommended.
Lapp bushings are designed to carry the short term overloads
specifed by ANSI/IEEE transformer standards. Lapp PRC
bushings for other applications
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(e.g., oil-to-oil, oil-to-gas, outdoor-to-indoor air,
etc.) are available for various voltage classes and
current ratings.
Design Features
1. Gaskets
Nitrile rubber, cork gaskets are designed to provide
uniform, active loading to compensate for temperature
variations and to assure oil-tight joints, reliable
mechancial strength and extended life.
2. Clear-View Oil Reservoir
The tinted glass oil reservoir filters damaging ultraviolet
rays, preventing oil deterioration. The oil level and
condition is clearly visible from any angle.
3. Porcelain Housing
The outdoor porcelain housing has sturdy sheds to provide
required leakage and strike distance and has ground
surfaces on top and bottom ends for oil-tight gasket
seals.
4. Name Plate Data
The name plate affixed to the
mounting flange identifies the bushing by catalog number,
serial number and year of manufacture with electrical
ratings and factory measurement data.
5. Power Factor Test Tap
15 kV through 69 kV bushings have a power factor test
tap. The test tap is connected to the ground layer of
the capacitor core. An aluminum cap covers the insulated
test tap assembly and grounds the tap to the flange
when energized.
6. Mounting Flange, Ground Sleeve Assembly
The mounting flange and ground sleeve assembly is made
of aluminum and provides nonmagnetic, corrosion-resistant,
high-strength service.
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