Wind Energy Conversion Systems by S.M. Muyeen

Author:S.M. Muyeen
Language: eng
Format: epub
Publisher: Springer London, London

11.5 Lightning Surge Analysis III: Effect of Overhead Earthing Wire(s)

The aim of the analysis in this chapter is to clarify the influence of earthing wire(s) of the collection line in a wind farm. Reference [10] also noted that earthing wire(s) can reduce burnouts of SPDs in the case of a communication tower. This paper tries to clarify whether there is a similar effect from the installation of earthing wire(s) for wind farm LPS.

The phenomenon of surge invasion to the collection system from a wind turbine that is struck by lightning is quite similar to the “back-flow surge” reported in Ref. [10]. In that report, the surge flowed from a customer’s structure such as a communication tower into the collection line in a wind farm. High resistivity soil often creates SPDs for tower earthing systems to operate in reverse and allow reflux of the surge current to the collection line. It is reported that this back-flow surge can sometimes burnout SPDs or break down low-voltage circuits even on an electric pole far from the point where the lightning struck.

Several breakdown and burnout incidents in low-voltage circuits and SPDs at wind farms are thought to be the result of the above back-flow surge. In practice, many of the incidents that have occurred not only involved the actual lightning-struck wind turbine but also other wind turbines that had not been struck. The reason why turbines that were not struck were nevertheless damaged has not been fully explained.

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.