Last edited by Yozshujas
Saturday, July 25, 2020 | History

2 edition of Protection of buried cable from direct lightning strike found in the catalog.

Protection of buried cable from direct lightning strike

Hsi-Tien Chang

Protection of buried cable from direct lightning strike

by Hsi-Tien Chang

  • 219 Want to read
  • 15 Currently reading

Published by Dept. of Energy, Sandia Laboratories in Albuquerque, N.M .
Written in English

    Subjects:
  • Underground electric lines

  • Edition Notes

    StatementHsi-Tien Chang, Advanced Electrical Systems Division 4362, Sandia Laboratories ; prepared by Sandia Laboratories for the United States Department of Energy under contract AT(29-1)-789
    SeriesSAND ; 78-1783
    ContributionsUnited States. Dept. of Energy, Sandia Laboratories. Advanced Electrical Systems Division 4362
    The Physical Object
    Pagination18 p. :
    Number of Pages18
    ID Numbers
    Open LibraryOL14883187M

    substation designers to minimize direct lightning strokes to equipment and buswork within substations. The general nature of lightning is discussed in clause 2 and the problems associated with providing protection from direct strikes are described in clause 3. The methods reviewed in this guide for designing a system of protection are explained in. Lightning Cost/Risk Trends – past/present Lightning-related losses exceeded $5 billion in (National Lightning Safety Institute, ) Lightning accounts for 61% of all accidents in storage and processing activities, where natural events are identified as the root cause of .

    underground cables, while the lightning strike on the cable connection station. The feasibility study of changing cable connection methods and related parameters to reduce the damage caused by lightning strike will be thoroughly conducted. The study system including lightning surge, transmission line, transmission tower. Coaxial Surge Protector for Cable TV,Surge Lightning Protector for Coaxial TV Antenna and Satellite in-Line 75 ohm MHz out of 5 stars 13 $ $ 9.

      When lightning strikes, an LPS offers assurance. An effective LPS not only protects roofs, walls and other structural components from direct lightning strikes, but it also shields electrical circuits, communications, process control systems and other elements that are vulnerable to indirect strikes.   That being said, OHC form higher points that may prove attractive to lightning strikes (highly theoretical) and to extend on that line of thought, should be hit more often in general. I think we are generally in agreement. However, don't forget that a strike to a pole within m of a buried cable also counts as a strike to the buried cable.


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Protection of buried cable from direct lightning strike by Hsi-Tien Chang Download PDF EPUB FB2

Lightning protection for buried cables follows the same principles as Lightning protection above ground. See the image Protection of buried cable from direct lightning strike book.

Applying the angle of protection method, one can see the buried conductor shown performs the same protective function as a catenary wire or Earthwire on an Overhead Powerline (OHL). Get this from a library. Protection of buried cable from direct lightning strike.

[Hsi-Tien Chang; United States. Department of Energy.; Sandia Laboratories. Advanced Electrical Systems Division ]. @article{osti_, title = {Protection of buried cable from direct lightning strike}, author = {Chang, H T}, abstractNote = {Protection schemes for buried cables were studied.

A formula is introduced that gives the maximum peak lightning current for various ground resistivities. Maximum and minimum arcing distances beneath the surface are calculated using the internal breakdown gradient of.

DOI: /TEMC Corpus ID: Protection of Buried Cable from Direct Lightning Strike @article{ChangProtectionOB, title={Protection of Buried Cable from Direct Lightning Strike}, author={Hsi-tien Chang}, journal={IEEE Transactions on Electromagnetic Compatibility}, year={}, volume={EMC}, pages={} }.

LPL-I covers a pulse of kA as a worst-case scenario of a direct strike of a lightning and pertains to external lightning protection facilities as shown in Fig. Half of this current is expected to conduct into earth, and in a 3-phase-4 wire system a current of 25 kA.

References 1 H.-T. Chang, “Protection of buried cable from direct lightning strike,” IEEE Transactions on Electromagnetic Compatibility, no.

3, pp. –, Lightning strikes, even several miles from a structure, can generate a power surge that travels through aerial or buried cable lines to sensitive electronic equipment. Direct lightning strikes to equipment and cables are too powerful to protect against, however, protection against transient surges can be accommodated by equipment and system design.

When lightning strikes the ground, currents up to kA flow through the soil toward the center of the earth. However, since the soil has a finite resistance, the lightning current I L spreads out in many directions, represented by I L1, I L2, and I L3 in Figure 4.

This creates a voltage gradient that can be represented as a set of equipotential half-spheres, indicated by the blue lines in. The effects of electric fields due to direct lightning strikes on ground to underground cable need to be considered.

Objectives of Project The objectives of this study are as follows: 1. To design and model circuit that represent soil and underground cable; 2. To investigate the effects of lightning strike to ground on underground.

The influences of lightning strike point, cable length, and ground conductivity on the LEMP coupling to buried cable are evaluated. The method of using shield wires to decrease the lightning-induced currents on the buried cables is proposed, and the protection efficiencies of different installing ways of the shield wires are evaluated.

Fiber optic cables have good protection performance, and the metal components of cable’s insulation value is so high that lightning current can not enter the cable easily. However, because fiber optic cable has strengthened core, especially the direct-buried fiber optic cable has armoring layer, thus when the optical fiber cable line.

This is a typical reaction and unfortunately it is based on ignorance. True, people may never, or rarely, experience, direct lightning strikes on exposed, in-building cable feeding into their equipment.

However, it is not uncommon to find computer equipment being fed by buried cable. There is no exposure to a direct lightning strike (also see point 2 below) 2. The cable is buried at depth of 1m. There are many steel structures on the surface. Hence we are not considering a direct lightning strike to the cable through the 1m depth of soil (statistically its too low to consider).

Use a PVC conduit to run certain non-direct burial cables underground. If you do not have a direct burial Ethernet cable, you may still be able to bury it with a conduit.

Slide the conduit over the cable before installing it to bolster your cable's protection in underground : 16K. Lightning strike-Any attachment of the lightning flash to a vehicle or ground facility.

Lightning stroke (return stroke)-A lightning current surge that occurs when the lightning leader makes contact with the ground or other region of opposite charge. 1, according to lightning environment to choose fiber optic cable.

For those areas where lightning is frequent, optical cables with high-strength dielectrics and better lightning protection is the first choice. At the same time, it can also reduce the loss and try to ensure that the optical cable is not damaged by lightning strike through.

This site, with long-buried cable-runs, between plant areas. The delegates question, “What about the buried cables?” What do we do about Lightning protection for buried cables in Lightning design?” The question was not aimed at surge protection, but at physical protection of the cables from a direct lightning strike.

And, before you say what. A lightning strike to AC wires far down the street is a direct strike incoming to every household appliance. A typical incoming path. RE: Lightning surge protection on underground network cable. Direct lightning strikes onto communications cables are relatively rare, however, conducted interference onto communications cable circuits arise more frequently from nearby strikes to ground.

When lightning strikes the ground, very large currents flow away from the strike point, both along the surface and into the ground. The international lightning protection standard IEC describes how direct lightning strikes of up to kA are safely arrested.

The current is coupled into the earthing system and, due to the voltage drop at the earthing resistor, half of the lightning current is coupled into the internal installation.

Abstract: Damages of buried energy pipeline due to direct Lightning strikes on ground has recently appeared substantially noticeable. This paper presents comprehensive study of damages on energy pipelines buried under homogeneous soil due to direct strike on ground over/near the pipeline.Protection of Buried Cable from Direct Lightning Strike while the number of buried shield wires required for adequate protection is determined by the minimum arcing distance.

The effectiveness of the proposed protective schemes is demonstrated by electrogeometrical theory. Finally, the qualifications of the new schemes are discussed.

The "drain wire" ground has almost NOTHING to do with lightning protection. Direct burial Cat 5 or 6 F/UTP, properly grounded. Cat 5 or 6 UTP in PVC conduit. Feel free to add Ethernet surge protectors to any of these for marginal additional protection.