5-44 W650 Wind Generator Protection System GEK-113032A5.4 PROTECTION ELEMENTS 5 SETTINGS55.4.3.3 PHASE DIRECTIONAL ELEMENT (67P)The Phase directional element (67P) provides independent elements for each phase, and determines the direction of thecurrent both in permanence and in fault condition.Its main function is to apply a blocking signal to the overcurrent elements to prevent their operation when the current isflowing in a certain direction. In order to determine the direction of the current, the element uses phase current values asoperation magnitude, and phase-to-phase voltage values as polarization magnitude. This means that in order to polarize aphase, we use the phase-to-phase voltage of the other two phases, known as crossed polarization.The following table describes the phase directional element settings.Table 5–42: PHASE DIRECTIONAL ELEMENT SETTINGSFunction: This setting allows enabling or disabling the corresponding directional element.MTA: The MTA setting corresponds to the Torque angle, which is the rotation applied tophase-to-phase crossed voltage.Direction: This setting allows selecting the area for the directional element to operate, eitherforward or reverse.Block Logic: This setting allows selecting either permission or block, depending on the logic to beapplied in the event of directional element block.Polarization Voltage Threshold: This is the minimum voltage considered for the direction calculation. Under this setting,the element will be blocked.Snapshot Events: The snapshot event setting enables or disables the snapshot event generation for thephase directional elements.Phase directional element is an independent Protection element that provides block and Operation signals for each phase.These signals can be monitored both through the relay HMI or using EnerVista 650 Setup at “Actual > Status > Protection> Phase Current”SETPOINT > PROTECTION ELEMENTS > PHASE CURRENT > PHASE DIRECTIONAL >PHASE DIRECTIONAL 1> PHASE DIRECTIONAL 2 > PHASE DIRECTIONAL 3SETTING DESCRIPTION NAME DEFAULT VALUE STEP RANGEFunction permission Function DISABLED N/A [DISABLED – ENABLED]Maximum Torque Angle MTA 45º 1 Deg [-90 : +90]Operation Direction Direction FORWARD N/A [FORWARD – REVERSE]Block logic Block Logic PERMISSION N/A [BLOCK – PERMISSION]Polarization voltage threshold Pol V Threshold 50 1 V [0 : 850]Snapshot event generation Snapshot Events ENABLED N/A [DISABLED – ENABLED]
