What to Look for in a Low-Voltage Unit Substation

Many considerations from location to breaker selection in the application of low-voltage unit substations in the cement industry are presented. Five basic topics are covered in the following order: general considerations, high-voltage section, transformer section, breaker section, and device coordination. Features of the new solid-state trip device now available on low-voltage circuit breakers plus coordination aspects of fault protection are also discussed. The material is presented in such a manner that it can be used as a check list when specifying low-voltage unit substations.