Lightning Arrestor

Lightning arrestor? Do you mean conductor?

Enormous electromagnetic discharge either cloud to ground, cloud to ground or direct heat. if it finds conductor, it will induce surge. Also SPD's protects your quality of supply from TOV and transient voltages.

If you have expensive gadgets or home appliances you might as well invest SPD.

thanks for your reply,

my question is, since there is lightening protector with the 66kv line, do i need to provide the same for the house also? how long it will cover by the 66kv line protector, if it is within the range i hope no need to give seperately. my house is near 100meter to the 66kv line

How long is your line from the distribution transformer to your mains at your house? It is necessary however for assurance and local fire standard(though vary) that mains and devices especially expensive are to be protected.

What happens when you install one SPD good for all? A surge may travel both ends of the wire to any path least resistance.

That is why SPD's are necessary at mains and devices as a form of a redundant protection.

Well, you just spend once, but your equipment is well protected.

You're repeating yourself instead of answering the questions you've been asked. You've no need to do the former, and every need to do the latter.

Are there any other houses at the same or a closer distance to this line? What arrangements are in place for those? If there is none, why is your house in any way special?

Never had a lighting arrestor before. What's the big concern now? Because the effects of lighting hitting a tree in your yard or between your home and the tower would be about the same as hitting one of these towers.

Within 100 meters could mean less than a meter to 100 meters which is it? A more exact distance would be helpful.

Then again there is no harm to protect your home with a lighting arrestor.

Just wonder how many times your home has been hit by lighting that you think these power line tower would cause it to be hit more.

If they are both the same height they have an equal probability of being struck by lightning unless there is something that's taller nearby. Lightning arresters on a pole line have absolutely nothing to do with you, they're there for the utility's benefit, it just diverts the energy from a bolt that hits the line and mitigates its effects on the circuit.

A properly engineered and installed lightning protection system on your home may provide an alternate path for a direct strike rather than have it go through the house's structure and/or wiring, but it's no guarantee, just an odds enhancer.

Surge arresters on your main panel should be installed to reduce the effect of a nearby strike passing into your house wiring, but very few consumer grade systems will survive a direct strike.

FAA-STD-019E references the "rolling sphere" method but NFPA 780 cites specific details. I have also seen recommendations to put surge arrestors at your facility entrance as well as on paths for critical loads. EATON provides an intersting mpg titled TVSS Video that I would upload or attach but can't seem to find where to do that.

"A certain utility company has been known to direct lightning away from their expensive sub-stations by firing small rockets into an energized cloud, dragging a small wire with it. When the lightning strikes the rocket, the zig-zag shape suddenly straightens out as it follows the wire to ground. It looks very un-natural, but it works."

Interesting, If I understand the physics involved, it would appear that they're effectively erecting gigantic, single-use lightning rods. They could get the same effect by building a metal 'strike tower' up to the height they launch the rockets to, but that's most likely A) against the local building codes to build that high and B) impossible to make a stable structure that tall with modern materials.

Florida Power & Light uses it. They have automated stations near a few substations.

There seems to be some confusion as to the difference between a lightning conductor and a surge arrestor in this thread. Please will the original poster remove the confusion?

Good point.

Lightning Rods are used to prevent a strike directly upon the structure. They accept the lightning and direct it through a conductive path to ground or from ground to the space above the structure.

Surge arrestors protect the house wiring system from surges, which can happen from many sources on the power grid, including but not limited to lightning strikes. Though most surge protectors would not be adequate for a lightning strike type surge on the power lines.

Thanks all of you, i mean conductor

Hire a lightning and surge protection specialist and evaluate the danger to the house considering surroundings,material of construction,height,objects located near it etc and assess the level of protection required.

Why bother? Pay your insurance and don't worry! The chances are so slim, it's not worth worrying about. I've lived in Malaysia, West Africa and the Canadian Prairies with some amazing thunderstorms and have never seen a house with a lightening conductor or a specific surge protector.

or if you really, really must, wrap it in chainlink and call it a faraday cage!

Well then, here you go!

Hi,

"...The height of the tower and the top of my house are same..." This statement puts the 66KV OH line out of contention of offering any kind of protection to your structure, ie. based on the Franklin rod concept and its attendant cone of protection. Say taking the less conservative 45deg. protection angle, your structure would need to be right next to the tower for it to offer any kind of protection.

It is often a misconception that provision of structural lightning protection system (LPS) is the panacea of all ills with regards to lightning and surges. Structural LPS at best only serve to channel any lightning discharges safely to ground which would otherwise have discharged through the building structure and cause damage.

Lightning protection goes beyond protecting a building structure either through adopting Franklin rods/Faraday cage concept, or others. (the Early Streamer Emission ESE concept, charge collection volume method, etc are bones of contention) Lightning (not to mentioned switching surges, etc) surges do come in through the power lines as well. Therefore, surge protection devices SPD would serve well in protecting aganist surges infiltrating through the electrical power lines, lightning surges included. In addition downstream electrical/electronic equipment within an electrical installation should be further protected by appropriate SPDs.

Regards.

As a result of a lightning strike there is a possibility of an induced strike on nearby structures too.

Thanks to all