Accession Number:

ADA639039

Title:

Ultra-Violet Induced Insulator Flashover as a Function of Material Properties

Descriptive Note:

Conference paper

Corporate Author:

AIR FORCE WEAPONS LAB KIRTLAND AFB NM

Personal Author(s):

Report Date:

1983-06-01

Pagination or Media Count:

5.0

Abstract:

Previous work has shown that a small fluence of UV photons is sufficient to initiate flashover at the insulatorvacuum interface of a vacuum insulated transmission line. 1 In this paper we examine the behavior of polyethylene, polystyrene, and teflon insulators in which the dielectricvacuum interface was oriented at a 45-degree angle to the applied electric field. Field stress was varied over the range 10-70 kVcm, both positive and negative polarity. The insulators were exposed to various UV spectra with photon energy up to 12 eV. All insulator materials were unaffected by radiation with photon energy 3 eV or less regardless of power, The geometry which withstood the greatest photon fluence was, for every material, the inverse of the geometry suggested as preferable by applying conventional DC breakdown criteria. A model explaining the polarity phenomena as well as the insulators behavior under various spectra is proposed.

Subject Categories:

  • Electricity and Magnetism
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE