INTRODUCTION

Surge diverters type VSD have been designed to provide effective protection of motor and transformer insulation against voltage surges, which may sometimes result from the operation of switchgear. They are suitable for systems having working voltages from 3.3 to 11kV rms. Each diverter consists of a spark gap assembly in series with a number of Metrosil non-linear resistors housed in a ceramic body. The Metrosil resistors and spark gaps have been specially developed to provide optimum protection under severe switching surge conditions and are individually tested for selective assembly.