346 9424200994 Rev NPower System SettingsThe BE1-11g requires information about the power system to provide metering, fault reporting, faultlocation, and protective relaying.Power system settings are configured on the Power System settings screen in BESTCOMSPlus®. Asummary of the settings appear at the end of this section.BESTCOMSPlus Navigation Path: Settings Explorer, System Parameters, Power SystemHMI Navigation Path: Settings Explorer, System Parameters, Power SystemNominal SettingsFrequencyNominal Frequency can be set for 25-, 50-, or 60-hertz power systems.VoltageThe nominal Secondary Phase Voltage (Vnom) setting is used by the 60FL function, directional calculationsfor the 67 elements, and DNP3 analog event reporting functions. This setting is also used in thevolts/hertz (24) calculation.Vnom is defined as the secondary phase-neutral voltage for all sensing connections. That is, even if theuser has selected 3-wire, AB, BC, or CA phase-phase sensing connections, Vnom must be set for thephase-neutral equivalent. For example, if a 3-wire open delta voltage source with a phase-phase voltagerating of 120 volts is connected, V nom must be set at 120/ 3 or 69.3 volts.CurrentThe nominal Secondary Phase Current (I nom) setting is used by the 60FL function, directional calculationsfor the 67 elements, and DNP3 analog event reporting functions. I nom is also used in the volts/hertz (24)calculation and in the 46 time curve calculation (K factor) of the negative-sequence current (51-x)element.I nom is the nominal phase current rating for the system corresponding to 1 pu current and is configured insecondary amps. If 1 pu secondary current is unknown, then setting Inom to the secondary CT rating (1 or 5A) is acceptable for most applications. However, this could degrade the expectation (not accuracy) of thetime curve for the 51-x negative-sequence element as Inom is used to directly compute multiple of pickup(MOP) and time delay.Power PolarityThis setting defines the polarity of metered watts and vars.Phase Rotation SetupNormal phase rotation can be set for either ABC rotation or ACB rotation.Power Line ParametersPower line parameters are used for fault location and distance to fault. For more information on distanceto fault and the power line parameters, see the Fault Reporting chapter.Maximum Torque AngleMaximum Torque Angle (MTA) is used by the directional overcurrent (67) element to provide directionalsupervision of the overcurrent tripping elements. The MTA for the phase and ground polarizing elementsis normally derived from the line impedance angles (power line parameters) but there are applicationsrequiring MTA's different from the line impedance angles. For more information on setting MTA fordifferent applications, see the Directional Overcurrent (67) Protection chapter.Configuration BE1-11g
