Distribution lines are part of power systems that includes power conversion from a primary source, typically 4kV to 34.5kV, down to a lower voltage that is supplied to power consumers. A simple set-up is that this type of lines leaves a primary substation through a line called feeder lines to another small capacity transformers called distribution transformers to be converted to a lesser voltage level of about 120V to 480V of either a residential or industrial consumer.