[Trade Journal]
Publication: Electrical World
New York, NY, United States
p. 206, col. 1
Huge Porcelain Bushings
Two long high-voltage electrical porcelain insulators are available in one-piece homogeneous structures. These reportedly are the largest pieces of porcelain ever produced.
The bushing type insulator on the right is for a 230-kv interrupter unit of a 230-kv oil blast circuit breaker. It is 112 in. long, 24 in OD, weighs 1,325 lbs, and has 246 in. of leakage distance. The ends are ground for gasketing and will be supplied with metal flanges cemented for mounting.
The bushing type insulator on the right is for a 230-kv pothead for pressure cable. It is 101.25 in. long, weighs 837 lb, and will be supplied with ends and conical sections near the ends ground for gasketing.
The size and slender proportions, and the fact that the pothead bushing is designed to withstand a pressure of 800 psi, combine to make this a difficult piece to produce. Every porcelain is proof tested to 500 psi and operates at 250 psi. Soundness, security and permanence have been established by a series of exhaustive tests.
The porcelains are in quantity production.
Lapp Insulator Co., Inc, Le Roy, N. Y.
