The scenario
An open pit iron ore mine receives 33 kV utility power, stepping down to 6.6 kV for distribution to large SAG mill motors (3000 kW each) and auxiliary loads. Soft starters (VFDs) are used to limit motor starting current.
What is in this drawing
Read the decisions behind it.
01
Select 33/6.6 kV transformer rating of 20 MVA to meet total load and allow future expansion.
02
Use VFD soft starters for SAG mill motors to reduce mechanical stress and voltage dips.
03
Install a 2 MVAr capacitor bank for power factor correction of large motor loads.
04
Feed SAG mills and pump loads from a common 6.6 kV bus through dedicated circuit breakers.
Applicable for electrical design reviews, power system studies, and operational planning in large mining operations with heavy motor loads.
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