15kV-69kV PRC^® Bushings (Paper-Resin-Capacitor)

» PCORE Capacitance Graded Bushings and Services Catalog 1.0 (2.08mb)

PCORE 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. PCORE PRC bushings meet all ANSI/IEEE standards for outdoor apparatus bushings, where these standards apply, for voltage classes 15 kV through 69 kV. When an application results in overload above ANSI/IEEE standards, a bushing having a higher current rating is recommended. PCORE bushings are designed to carry the short term overloads specifed by ANSI/IEEE standards. PCORE PRC bushings for other applications (e.g., oil-to-oil, oil-to-gas, outdoor-to-indoor air, etc.) are available for various voltage classes and current ratings.

» PRC Bushing Enhancement - C2 - PCORE (40kb)

» Instruction Manual for PCORE PRC Bushings (248kb)

» Installation Instructions for Horizontally Mounted PRC Bushings (99kb)

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.

7. Paper-Foil Capacitor Core
Conductive layers of aluminum foil with high dielectric paper are wound around the conductor and into the bushing core to produce uniformly valued capacitors in series. This capacitance grading distributes the voltage and the electrical field uniformly throughout the core. The core is vacuum-dried and impregnated with high dielectric epoxy-resin.

8. Flange-Core Potting Compound
Once cured, the slightly resilient potting compound mechanically holds the flange-core assembly together and is an excellent shock absorber under dynamic cantilever loading.

9. Dried, Degassed Oil
The internal space in the bushing above the flange and between the porcelain and core is filled with dried, degassed insulating oil.

Unique Features of PCORE PRC Bushing Core