Innovations in power distribution in cement plants

A few of the many new product applications and protection methods first used in the decade between 1971 and 1981 for cement plant power distribution systems are surveyed. References noted in each brief discussion contain application details as well as equipment descriptions, ratings, and application advantages of the innovations discussed. Transformers: Transformer designs, transformer through fault protection. Motors: Thermal tracking motor protection, wound rotor motor protection, dual drive protection, high efficiency 460 V motor design, large horsepower SCR-dc fan drives, medium voltage load commutated inverter drives. System: Medium voltage vacuum circuit breakers, pilot wire tie line protection, transformer ground differential protection, zinc oxide station class surge arresters.