If the power factor is low in the power system, increase the capacitor compensation, is able to enhance the voltage. This is because the power factor is low in the power system, and the grid for the exchange of reactive current is relatively large, and the power supply line in this province there is an impedance, the longer the line, the finer the diameter of the line, the line's impedance is bigger, in the power factor is low, the line conveys reactive current is bigger, in the transmission line to produce heat loss, and caused by the line voltage drop is also bigger, so that the voltage value of the tail end of the line is also down.

At this time, if the end of the line to increase the shunt capacitor, the reactive power needed by the load capacitor in situ to provide, which is smaller line transmission current, of course, the heat loss on the line will also reduce, while the voltage drop on the line will also be reduced, then the end of the line (customer side) voltage is also increased.

As for how much can be raised depends on the initial power factor, the impedance of the transmission line to determine.