4 edition of Cable coupling lightning transient qualification found in the catalog.
Cable coupling lightning transient qualification
by Thiokol Corp., Space Operations, National Aeronautics and Space Administration, Marshall Space Flight Center? in Brigham City, UT, [Marshall Space Flight Center, Ala
Written in English
|Statement||[prepared by M. Cook].|
|Series||NASA-CR -- 183826., NASA contractor report -- NASA CR-183826.|
|Contributions||Thiokol Corporation. Space Operations., George C. Marshall Space Flight Center.|
|The Physical Object|
1. Grcev L.: Transient Voltages coupling to shielded cables connected to large substation earthing systems due to lightning. CIGRE , Session, 2. Grcev L.: Numerical analysis of the transient voltages near grounding systems. 21st ICLP, Berlin, Germany 3. Grcev L., Arnautovski V.: Transient Voltage. Lightning Surge Simulator LSSAX Series. Conforming to IEC GENERAL. Surges represent transients that might be induced in cables by lightning. By their nature, fairly high energy charges may easily damage or upset unprotected electronics circuits and components. Surges are not a new problem.
SES is an internationally recognized R&D pioneer and leader in the areas of power system grounding (earthing) and electromagnetic interference, including transient and lightning analysis. Its CDEGS suite of software packages is the state of the art in this field of expertise and an industry reference worldwide. Fi- nally, we present a time domain solution of ﬁeld-to-buried cable coupling equations using the point-centered ﬁnite difference time domain (FDTD) method, and a frequency domain solution using Green’s functions. In our companion paper (Part II), we compare. Manuscript received Octo Cited by:
A numerical method is presented in this report to determine the amount of coupling between a lightning discharge to ground and an earth-return transmission line. The transmission line is assumed to be a long straight horizontal coaxial cable with an inner shield and an outer armor, terminated on both ends with typical communication equipment load impedances. It explains the differences and consequences of: Direct lightning flashes Lightning flashes on MV and LV power lines – both nearby and at a distance Overvoltages caused by resistive, inductive, and capacitive coupling with a system carrying a lightning current The closer the lightning flash is, the higher the stress on the concerned structure.
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Coupling lightning transient qualification test. Testing consisted of subjecting the redesigned solid rocket motor (RSRM) lightning strike test article case, systems tunnel cover, instrumenta-tion, and cables to simulated lightning discharges and measuring the voltage levels, if any, in-File Size: 4MB.
Get this from a library. Cable coupling lightning transient qualification: final test report. [M Cook; Thiokol Corporation.
Space Operations.; George C. Marshall Space Flight Center.]. Testing consisted of subjecting the lightning evaluation test article to simulated lightning strikes and evaluating the effects of instrumentation cable transients on cables within the system tunnel.
The maximum short-circuit current induced onto a United Space Boosters, Inc., operational flight cable within the systems tunnel was 92 A, and the maximum induced open Author: M. Cook. or Lightning Induced Transient.
A shielded cable contains insulation between the center conductor and the outer shield. A properly shielded cable will see very little EMF, even with the residual charge of a direct lightning strike on the outside of the shield, and will allow electronics to continue to operate normally without Size: KB.
Inductive coupling (Figure 3) is produced by the magnetic flux lines generated during a lightning strike. As much as 70V/meter of cable can be induced by lightning strikes that are more than a three-dimensional mile away.
In other words, lightning does not have to strike the ground to inductively couple Size: KB. Exploring Lightning Susceptibility of Composite Materials and Cable Harnesses in Aircraft through Electromagnetic Simulation. Author(s): E.
Kowalczuk DOI: /ic For access to this article, please select a purchase option:Cited by: 1. The preferred method used to simulate the coupling problem of the shielded cable on the inﬁnite ground excited by plane wave is the full-wave algorithm, such as FDTD method and MOM method.
However, dueto thecomplex structureof the shieldinglayer of thecable, it is diﬃcult to modelthe cable with these methods Size: KB. The ground admittance needs to be taken into account in the calculation of lightning induced currents and voltages on buried cables.
This is in contrast with the case of overhead lines in which its contribution is generally negligible, even in the MHz by: User Review - Flag as inappropriate This is the origin of DOT/FAA/CT/22 AIRCRAFT LIGHTNING PROTECTION HANDBOOK (September ).
It has been updated twice by the authors and now being published as "LIGHTNING PROTECTION of AIRCRAFT" which is known in the industry as the text book is only available directly from Lightning Technologies, Inc. (now Lightning 5/5(2). Why is transient overvoltage protection so important.
Transient overvoltages are short duration surges in voltage between two or more conductors (L-PE, L-N or N-PE), which can reach up to 6 kV on Vac power lines, and generally result from: Atmospheric origin (lightning activity) through resistive or inductive coupling (see Figures 1 & 2),and/orFile Size: 2MB.
The fundamental document that defined the environment and test waveforms used in DO, Sect and accounted for the lightning data and analysis necessary to support these requirements, is SAE ARP, “Aircraft Lightning Environment and Related Test Waveforms,” originally published inand revised to Revision A in This document.
A practical engineer's guide to the areas of grounding, shielding and surge protection designed to deliver reliable equipment and communications systems Cited by: An efficient model to include thin wire structures in FDTD is used and validated in a lightning transient study on a buried cable in a realistic industrial site.
Lightning transient voltages in cables of a large industrial site using a FDTD thin wire model. and in coupling with the FDTD grid by a mean tangential electric field A method to assess the lightning transient behavior of the cables inside an industrial site has been proposed.
The method is based on the FDTD algorithm in combination Author: Luis Diaz, Céline Miry, Philippe Baraton, Christophe Guiffaut, Alain Reineix. 4 IET WIRING REGULATIONS. BS 18TH EDITION — Transient overvoltage protection.
Safeguarding your electrical systems — Why is transient overvoltage protection so important. Transient overvoltages are short duration surges in voltage between two or more conductors (L-PE, L-N or N-PE), which can reach up to 6 kV on.
Title: Author: Véronique Beauvois Created Date: 9/15/ PMFile Size: 2MB. book" and was adopted for both civil and military aircraft by the US and foreign certification agencies.
The SAE-defined lightning environment was formally incorporated into military and civil protection specifications in MIL-STD, revision MIL-STDA, and FAA Advisory Circular 20.
Lightning Electromagnetic Field Coupling to Overhead Lines: Theory, Numerical Simulations, and Experimental Validation. A lightning strike model of. Coupling modes 23 Radiated emissions from PCB (differential mode) 24 Cable radiated emissions (common mode) 25 Coupling paths (conducted emissions) 26 Susceptibility to radiated field coupling 27 Transient sources 28 Automotive transients 29 Supply voltage phenomenon 4 ways in which noise can enter a signal cable and its control (photo credit: ) Unpredictable transient noise is caused, for example, by lightning.
Constant noise can be due to the predictable 50 or 60 Hz AC ‘hum’ from power circuits or harmonic multiples of power frequency close to the data communications cable. This code allows the calculation of lightning induced voltages and currents along the cable shield.
In the second code, the coupling equations are solved in the fre- quency domain. The frequency domain code allows in addition the computation of induced in the inner conductor of the coax- ial cable.The lightning protection zone (LPZ) as shown in Fig.
and Table was introduced in the IEC for lightning protection design. Protection measures such as the lightning protection system (LPS), shielding wires, magnetic shields, and SPD determine the LPZs.
IEC also introduces four lightning protection levels (LPL) I–IV.lightning creates a transient on a nearby cable: 1) Lightning strikes an object nearby and induces a transient via electromagnetic coupling. 2) Lightning strikes a building and travels to ground through the building’s steel structure or a grounding cable.
The high currents induce a transient via electromagnetic coupling.