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Fostoria Bushings and Insulators

PB-4

POWER BUSHING ASSEMBLIES 23 KV CLASS, 150 KV BIL, 19.5″ CREEP


Technical Specification

1. Application

These bushings are designed for use in transformers, switchgear, entrance, and other special power apparatus applications.

2. Electrical Ratings

The electrical ratings are based on use in a liquid-filled transformer, with the lower end of the bushing positioned below the oil level.

3. Construction

  • Material: Manufactured from high-quality electrical-grade wet-process porcelain.
  • Finish: Gray glaze applied over the entire surface, unless otherwise specified.
  • Weatherproof Design: Top skirts are engineered for outdoor applications.
  • Sealing: Bushings are fully oil- and watertight at both the top terminal and mounting flange.

4. Mechanical Components

  • Flanges and Washers: Constructed from non-magnetic materials.
  • Disc Spring Assembly: Maintains constant gasket pressure at the top terminal to compensate for thermal expansion and contraction of the copper stud.

5. Gaskets

Optional Gasket: Cork and rubber composite — for this option, add suffix “C” to the part number when ordering.

Standard Gasket: Nitrile (Buna-N).

Technical drawing of a power bushing assembly, detailing dimensions, part numbers, and electrical ratings suited for various applications including transformers and switchgear.