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First transformer ever to be rendered bullet resistant by retrofitting
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Siemens has received an order for the world's first bullet resistant retrofit solution for a power transformer. The two, three-phase transformer units have been in service from 2013 and 2014, and play a strategic role in the US power grid.
Siemens Transformer Lifecycle Management (TLMTM) will design the retrofit solution and install shielding to protect the tank and conservator from all sides. The protection system panels have been designed and tested to withstand rifle projectiles according to VPAM Class 13, the highest class of rifle projectiles specified by VPAM, and the most powerful commonly available bullet that is not considered a destructive device under the United States National Firearms Act.
The current oil-filled casing of the transformer will also be replaced by a HSP resin impregnated synthetic (RIS) casing. This means that even if the RIS bushing is penetrated by the bullet, it will not cause a fire, because the polymer insulation bushing does not contain oil.
Article from:
http://www.transformers-magazine.com/
