. American hydroelectric practice; a compilation of useful data and information on the design, construction and operation of hydroelectric systems, from the penstocks to distribution lines . spension Insulators.—A great number of different designs of suspen-sion type insulators are offered by manufacturers, but in general two types TRANSMISSION LINE CONSTRUCTION AND OPERATION 199 have been widely used. The interhnking type and the one piece disc typewith a metal cap and center pin cemented to insulators. The first designhas the advantage that in case the insulator breaks the wires will hold th
. American hydroelectric practice; a compilation of useful data and information on the design, construction and operation of hydroelectric systems, from the penstocks to distribution lines . spension Insulators.—A great number of different designs of suspen-sion type insulators are offered by manufacturers, but in general two types TRANSMISSION LINE CONSTRUCTION AND OPERATION 199 have been widely used. The interhnking type and the one piece disc typewith a metal cap and center pin cemented to insulators. The first designhas the advantage that in case the insulator breaks the wires will hold theother units together, and in good many cases prevent a shut down, butagainst this there is the possibility of their breaking from constant rubbingin the holes. In the one type the insulator is in tension, while the inter-linking type is in compression. In general the principles of design of pininsulators are applicable to the suspension insulator, since the latter maybe considered a modification of the former. In the early designs of suspen-sion units, a disc type without petticoats was employed, but the latterdesigns make use of concentric circular ribs or petticoats on the under. Fig. 111.—Types of Pin Insulators for Transmission Line ^^^^Voltages around 22,000, 35,000, 45,000, and 75,000 Volts(R. Thomas and Sons Company)
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