RES 521 terminals installed in critical nodes of power systems enable increasing the transmission capacity without the need to invest in additional transmission lines. At the same time it improves the operational security of the power system.
The superior measurement performance and system-wide data in combination with software tools, such as PSGuard, for monitoring and presentation of power system dynamics provide the operator with real-time phasor information for remedial actions. The information can be utilized to estimate, or in fact, calculate the power system state. In the case of evolving power oscillations, RES 521 provides information for instance about voltages and currents to retain system stability.