3 edition of How to protect a wind turbine from lightning found in the catalog.
How to protect a wind turbine from lightning
|Statement||Curtis W. Dodd, Thomas McCalla, Jr., and James G. Smith ; prepared for National Aeronautics and Space Administration, Lewis Research Center under agreement NCC 3-7 for U.S. Department of Energy, Conservation and Renewable Energy, Wind Energy Technology Division under interagency agreement DE-A101-76ET20320.|
|Series||NASA CR -- 168229., NASA contractor report -- NASA CR-168229.|
|Contributions||McCalla, Thomas., Smith, James G., Lewis Research Center., United States. Dept. of Energy. Wind Energy Technology Division.|
|The Physical Object|
A wind turbine blade with a lightning conductor, where said lightning conductor is formed by one or more oblong strips (1, 2, 3) of carbon fiber-reinforced plastics preferably forming part of the wind turbine blade. In this manner the oblong strips (1, 2, 3) of carbon fiber-reinforced plastics both reinforce the blade and divert the by: Despite the existing lightning protection systems available for wind turbine blades, there are still many cases reported due to the fact of damage caused by lightning strike.
Lightning plays a lead role in the failures and outages at wind farms. In , lightning accounted for % of wind turbine failures. Therefore, it is critical that the design and installation of a lightning protection system (LPS) for the wind turbine be done correctlyFile Size: KB. Turbine blades and towers are prone to lightning strikes and lightning arresters are not the proper tools to protect the wind turbines against lightning damages. Lightning usually hits the sharpest and tallest object in an area because ground charges emitted from objects with high elevations reach to opposite charged streamers of the cloud.
Lightning protection system Lightning protection system of any aforementioned wind turbine includes air terminals in the blades and rods in the nacelle, down conductor and earth electrode. Air terminal The nacelle is protected from a direct strike by a lightning rod placed close to the aircraft warning light. Lightning protection in the Cited by: 1. Testing wind turbine lightning protection. To reduce the likelihood of damage, protection from lightning is now being built into the turbines. It is hoped that this will prevent the damage shown in figures 2, 3 and 4. Figure 2: Turbine blade damaged by a lightning strike.
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Provided . The same philosophy is adopted in the protection of wind turbines _rom lightning damage. As the quality of protection improves the cost will increase. Wind turbine designers must make cost Judgements when considering lightning protection.
The methods of protection explained in this book are based on the theory. According to the standard, DNV GL examines corresponding components of wind turbines to confirm the proper design of lightning protection system of e.g.
blades and the complete wind turbine. This service results in a component certificate for blades, laboratory approval or shop approval or is considered in the type certificate for the wind turbine. Most wind turbine manufacturers strive to make blades and turbines that are more reliable, and can withstand natural phenomena such as lightning.
These designs attempt to provide “preferred” current paths for the lightning current; conductive meshes over the exterior of the blades, lightning receptors (preferred lightning attachment locations), and large down conductors, help carry high currents.
Typical Lightning Protection System for Wind Turbines. The earthing system that is studied here is Type B and consists of horizontal copper electrodes with diameter of 17mm and vertical ones of 20mm diameter.
The earthing system is installed at a depth of 2 m. The foundation was considered to have resistivity of ρfnd=50Ωm. Request PDF | On Jan 1,I.
Cotton and others published Lightning protection for wind turbines | Find, read and cite all the research you need on ResearchGate.
Lightning Protection for Small Wind Turbines. Connie-Ann Bracht. This has a recorded Webinar presentation with also the slides and detailed description per slide about lightning protection on small wind turbines.
The presentation goes into the basics of lightning, how to protect and also has a reference list to further study in detail the works.
Lightning and surge protection for wind turbines Information from Dehn Due to their vast exposed surface and height, wind turbines are frequently hit by direct lightning strikes.
Comprehensive lightning and surge protection measures are essential to maximise the return on investment and prevent downtime. Cloud-to-earth flashes, and earth-to-cloud. Cable and antenna analysers provide a unique and optimum solution for checking the main lightning protection system of the wind turbine and the Site Master SL Handheld Cable and Antenna Analyzer developed by Anritsu, can be considered as a cost effective and portable solution for maintaining these vital safety systems for wind farms.
One way to reduce the likelihood of strike damage is to build lightning protection directly into wind turbines.
When an unprotected wind-turbine blade is struck by lightning, its temperature will rise (as high as 54, F) and severely damage the surface of the blade.
It may also melt or crack the blade’s leading edges. A properly installed lightning protection system, however, will intercept the lightning and effectively and safely conduct it to the earth without risking physical destruction to the wind turbine.
This issue has become increasingly critical as wind turbine systems become more sophisticated and vulnerable to lightning. The next critical part of the lightning protection, as it relates to wind turbines, is the protection of the nacelle and the components within.
The nacelle is a housing that encloses the generator, gear box and associated electronic systems as shown in Figure 4. As lightning strikes often cause considerable material and economic damage, it is important to protect your turbines.
The chief objective is to prevent lightning from damaging the rotor blades, bearings and electrical systems. Permanent availability is the top priority, both for on- and offshore wind turbines.
Installing a lightning rod at the top of your wind generator tower isn't likely to protect your electronic equipment further and may not be cost-effective because the lightning rod may interfere with the wind's flow around the wind generator's turbine blades.
Each wire entering the electrical panel box should be protected with a surge suppressor grounded to an existing ground rod. Lightning rods will not effectively protect the wind turbines electronic equipment, and will obstruct the flow of wind around the turbine blades, thus reducing the efficiency of the system.
When the anemometer registers wind speeds higher than 55 mph (cut-out speed varies by turbine), it triggers the wind turbine to automatically shut off.
Feathering the blades When wind speeds surpass a modern utility-scale turbine’s rated wind speed, the blades begin to feather, or point into the wind to reduce their surface area. The lightning protection system for wind turbine operates the basic of capturing the charge as opposed to avoiding the lightning stroke.
Normally there is two type of lightning protection system is applied to protect the wind power structure such as mesh system and receptor system.
Lightning Protection Design, Earthing System Design Lightning Protection for Buildings Design - Duration: LP consultants International Pvt Ltdviews To plan protection measures, it is advisable to subdivide the wind turbine into lightning protection zones (LPZs). The lightning protection system of wind turbines protects two sub-systems which can only be found in wind turbines, namely the rotor blades and the mechanical power train.
Our optimally coordinated portfolio permits perfect protection of the wind turbine against short circuits and overloads in the field of supply and feeders through to the control and protection of electrical drives.
Furthermore it offers protection for personnel and a graded concept of protection against lightning and overvoltage. Figure 2 – Lightning protection zones concept for a wind turbine. Being a protection measure, the lightning protection zones concept includes therefore a reduction of the conducted and radiated interferences at boundaries down to agreed values.
For this reason, the object to be protected is subdivided into protection zones. The protection. Most wind-farm owners are aware of the benefits of a quality surge and lightning protection system.
However, lightning risks may vary greatly from one turbine to another at a wind farm. “Unfortunately, these assets are often purchased en masse,” says Sylawa.When an electrical storm passes near a wind turbine, the storm creates a strong electric field in the turbine and blades. This electric field is amplified near the tips of the blade, making the air at the tip ionize and forming rising tracers that connect with descending tracers forming the lightning bolts those striking the turbine blades causing a considerable damage.Instead of using electricity to make wind, like a fan, wind turbines use wind to make electricity.
The wind turns the blades, which spin a shaft, which connects to a generator and makes electricity. Since most wind turbines are meters high they are very susceptible to lightning strikes and power surges.