Identifier: pacificservicema1627paci (find matches)
Title: Pacific service magazine
Year: 1912 (1910s)
Authors: Pacific Gas and Electric Company
Subjects: Pacific Gas and Electric Company Electric utilities Electrical engineering Public utilities
Publisher: San Francisco : Pacific Gas and Electric Company
Contributing Library: San Francisco Public Library
Digitizing Sponsor: San Francisco Public Library

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II INSULATOR STRINGWITH CORONA SHIELD
Text Appearing After Image:
INSULATOR STRINGWITH RING SHIELDAND ARCING HORN F\g. 2 The fundamental weakness of the multi-part suspension insulator in its present formis the fact that the electrical strength of anyunit is much below the total voltage ap-plied, and no positive means exist for con-trolling the distribution of this voltageamong the several units. For parts requiring rigid support pillartype insulators are available consisting ofseveral multipart units. These units indi-vidually have much higher flashover valuesthan the suspension units. A typical flash-over value is 185 kv. dry and 145 kv. wet.Observation indicates better performance ofthese insulators in a given length than ofthe standard suspension units. 2—Corona Another important practical problem isthe selection of a size of conductor that will avoid excessive energy loss into the air byreason of the electrical overstress of the airsurrounding the conductor. This phe-nomena called corona has been recognizedfor many years and has been the subj

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