When selecting a power factor correction relay the following main functions should be
considered:
1.Measurement of the required reactive power and control the capacitor switching
according to the power factor desired or pre-set value.
2.Indication of power factor, preset parameters and specified installation data.
3.Disconnect the capacitors when a system voltage drop occurs, this will prevent
significant overvoltages in the installation and the subsequent damage to switchgear
insulation.
4.Allow manual control.
5.Provision for a visual display of signal lamps for monitoring the number of capacitors
steps switched into the system.
6.Possible implementation into a building management system