Water-Spray Extinguishing Installatios for Transformers.

The increasing use of large transformers and the confined spaces in which they are installed make it imperative to be able to detect quickly oil fires in transformers. For stationary installations the extinguishing process begins within 15 to 20 s. of the time of the triggering signal. A condition for this is short runs of pipe (up to about 20 m) between the valve station and the spraying cage. Guidelines are presented for the selection of proper equipment for a particular operating point. Among others, this depends on the availability of water resources and on the way in which the installation is used.