CVM Failure Case Studies

This article was posted 11/22/2010 and is most likely outdated.

Topic - Lightning Protection
Subject - CVM Failure Case Studies

November 22, 2010
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CVM Failure Case Studies

By Z.A. Hartono & I. Robiah

According to the collection volume method (CVM), the protection zone of the CVM is shaped like an inverted parabola with the apex at the point of high field intensification e.g. The Dynasphere air terminal or the corners of a structure. The proponents of the CVM always claimed that the “attractive radius” of the Dynasphere collection volume, when viewed from plan, is the largest due to the high field intensification at the terminal.
Studies of several low and high structures installed with the Dynasphere air terminal show that bypasses had occurred within the “attractive radius”. Some of these bypasses occurred as close as 10 metres away from the terminal while others occurred on the curved edges of the buildings where little or no field intensification was expected. This demonstrates that the CVM is a defunct air terminal placement method.

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Comments

Sir,The paper by Z.A. Hartono & I. Robiah excellently present CVM Failure Case Studies in the plain territories of Malasyia.However,it does not appear that any studies were carried out by the authors in mountainous areas where lighning strike intensities are more.Whether any 'field intensification' as claimed by CVM proponents occurs there? Thanks.

T.M.Haja Sahib
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thanks a ton for the info

Ghouse
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Thanks for the interesting report, Mike.

The report discusses the failure of the CVM when applied to ESE terminals, a technology that itself has been discredited and seems to be used primarily in SE Asia and that has been rejected for inclusion in American Lightning Protection Standards. It would be useful if the authors would comment on the viability or lack thereof of the CVM method to traditional Franklin air terminals, predominately used in the US and other parts of the world in lightning protection.installations.

Heinz R.
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