Voltage regulation system during large motor starting and operation

Holnam Cement in Devilslide, Utah built a new state of the art cement plant in an area with an existing plant. This more than doubled the electrical load on the power system served by a relatively weak 46 kV lines by Pacific Corp. Across the line starting of 2000 HP ball mill motors in the existing mill was already causing voltage problems to other customers on the power system and tripping a drive on the existing plant. In a cooperative effort between Holnam and Pacific Corp., a reactive power compensation system was installed on the cement plant 4.16 kV buses, which maintains almost constant voltage on the utility 46 kV system. Steady state supports, the starting of the 2000 HP motors, and support of the operation of the new mill, are all provided by one integrated system.