In a three-phase power system with a delta-connected 66kV transmission line, negative reactive power (capacitive) in one phase can occur while the other two phases exhibit positive reactive power. This condition may arise from various factors, including improper connections of current transformers (CTs) and potential issues with measurement devices. Solutions to mitigate negative reactive power include adding capacitors to decrease Vars, using inductors to increase Vars, or implementing a synchronous condenser to regulate reactive power flow effectively.
PREREQUISITESElectrical engineers, power system analysts, and technicians involved in managing reactive power and improving power factor in three-phase systems.
In electrical engineering, a synchronous condenser (sometimes called a synchronous capacitor or synchronous compensator) is a device identical to a synchronous motor, whose shaft is not connected to anything but spins freely.[1] Its purpose is not to convert electric power to mechanical power or vice versa, but to adjust conditions on the electric power transmission grid. Its field is controlled by a voltage regulator to either generate or absorb reactive power as needed to adjust the grid's voltage, or to improve power factor.