Nuclear electromagnetic pulse (NEMP) hardened cables. Final report, 1 July 1973--31 October 1975. [Braided shield design]

Technical Report · Thu Apr 01 04:00:00 EST 1976

OSTI ID:7135135

Wells, W C; Shiau, Y

Energy from a nuclear electromagnetic pulse (NEMP) couples into a system via the interconnecting cables. Calculations of the current induced on the sheath of a horizontal cable above a ground plane are discussed. These currents on the exterior of the sheath then excite the interior of the cable via the surface transfer impedance (Z sub T). The objective of reducing NEMP coupling into cables is met by reducing the transfer impedance of the cable sheath. A standard test procedure is used to measure (Z sub T). Typical military and commercial braided cable shields are measured first. Then, to more systematically approach the problem of reducing (Z sub T), a set of twelve preliminary prototype cable shields are constructed. The effects of braid angle, braid material, distance separating braid layers and interbraid materials (specifically insulators, aluminized Mylar foils, carbon loaded polyethylene and a ferromagnetic foil) on (Z sub T) are investigated. (GRA)

• Research Organization: IIT Research Inst., Chicago, Ill. (USA)
• OSTI ID: 7135135
• Report Number(s): AD-A-026020
• Country of Publication: United States
• Language: English

Related Subjects

440200* -- Radiation Effects on Instrument Components
Instruments
or Electronic Systems
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
CABLES
COAXIAL CABLES
CONDUCTOR DEVICES
DESIGN
ELECTRIC CABLES
ELECTRIC IMPEDANCE
ELECTRICAL EQUIPMENT
ELECTROMAGNETIC PULSES
ELECTROMAGNETIC RADIATION
EQUIPMENT
HARDENING
IMPEDANCE
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
RADIATION HARDENING
RADIATIONS
SHIELDING