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Title: Characterization of Indirect Coupling Mechanisms from Lightning to Underground Cavities.

Abstract

Abstract not provided.

Authors:
; ;
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1266892
Report Number(s):
SAND2007-0205C
524279
DOE Contract Number:
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: Proposed for presentation at the 2007 IEEE International Symposium on Antennas and Propagation held June 10-15, 2007 in Honolulu, HI.
Country of Publication:
United States
Language:
English

Citation Formats

Higgins, Matthew B., Caldwell, Michele, and Morris, Marvin E. Characterization of Indirect Coupling Mechanisms from Lightning to Underground Cavities.. United States: N. p., 2007. Web.
Higgins, Matthew B., Caldwell, Michele, & Morris, Marvin E. Characterization of Indirect Coupling Mechanisms from Lightning to Underground Cavities.. United States.
Higgins, Matthew B., Caldwell, Michele, and Morris, Marvin E. Mon . "Characterization of Indirect Coupling Mechanisms from Lightning to Underground Cavities.". United States. doi:. https://www.osti.gov/servlets/purl/1266892.
@article{osti_1266892,
title = {Characterization of Indirect Coupling Mechanisms from Lightning to Underground Cavities.},
author = {Higgins, Matthew B. and Caldwell, Michele and Morris, Marvin E.},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}

Conference:
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  • Abstract not provided.
  • Abstract not provided.
  • We characterize measurements, obtained during the Summer of 1986 at the NASA Kennedy Space Center, of simultaneous vertical electric fields and voltages induced at both ends of a 448 m overhead power line by artificially-initiated lightning return strokes. The lightning discharges struck ground about 20 m from one end of the line. The measured line voltages could be grouped into two categories: (1) those in which multiple, similarly shaped, evenly spaced pulses were observed, which we call oscillatory'', and (2) those dominated by a principal pulse with subsidiary oscillations of much smaller amplitude, which we call impulsive''. Observed voltage amplitudesmore » range from tens of kilovolts for oscillatory voltages to hundreds of kilovolts for impulsive voltages. 1 ref., 5 figs.« less
  • For short monopoles in this low-power case, it has been shown that a simple circuit model is capable of accurate predictions for the shape and magnitude of the antenna response to lightning-generated electric field coupling effects, provided that the elements of the circuit model have accurate values. Numerical EM simulation can be used to provide more accurate values for the circuit elements than the simple analytical formulas, since the analytical formulas are used outside of their region of validity. However, even with the approximate analytical formulas the simple circuit model produces reasonable results, which would improve if more accurate analyticalmore » models were used. This report discusses the coupling analysis approaches taken to understand the interaction between a time-varying EM field and a short monopole antenna, within the context of lightning safety for nuclear weapons at DOE facilities. It describes the validation of a simple circuit model using laboratory study in order to understand the indirect coupling of energy into a part, and the resulting voltage. Results show that in this low-power case, the circuit model predicts peak voltages within approximately 32% using circuit component values obtained from analytical formulas and about 13% using circuit component values obtained from numerical EM simulation. We note that the analytical formulas are used outside of their region of validity. First, the antenna is insulated and not a bare wire and there are perhaps fringing field effects near the termination of the outer conductor that the formula does not take into account. Also, the effective height formula is for a monopole directly over a ground plane, while in the time-domain measurement setup the monopole is elevated above the ground plane by about 1.5-inch (refer to Figure 5).« less