Question

How does cable shielded from lightning strikes?

Answer 1

Hint: Lightning may be a very powerful discharge made during a thunderstorm. The electrical current makes the air extremely popular . Sometimes lightning happens between clouds. Sometimes (in the rain) lighting goes from cloud to ground. If it goes from cloud to ground, it can strike an individual .

Complete answer:
At present, the measures of lightning protection of cable itself mainly believe the erection of the overhead ground wire of the tower top, its operation and maintenance work is especially on the detection and reconstruction of tower grounding resistance.
Through the analysis of lightning to the harmfulness of the facility cable , puts forward the precise measures to stop lightning accidents, improving insulation, installing controllable discharge lightning rod, reducing the tower grounding resistance, adding coupling ground wire and therefore the proper use of send.
When lightning strikes an overhead cable, the stroke current is diverted to ground. The present can take three paths. Normally, strokes hit the shield wires placed above the phase conductors, and therefore the current flows to ground through the towers. Back flashover failures will occur for very large currents.
One way to form sure your electronics are always shielded from lightning is to put in transient voltage surge protectors. Consistent with Allstate, transient voltage surge protectors are connected to computers and other equipment to limit voltage to 1.5 times the traditional voltage.

Note:
Typical Oscillograms of the lightning current and voltage wave shapes on a cable are shown in Figs 8.11 and 8.12. The lightning current oscillograms indicate an initial high current portion which is characterized by short front times up to 10 μs.