CHAPTER 5: SETTINGS SYSTEM SETUPN60 NETWORK STABILITY AND SYNCHROPHASOR MEASUREMENT SYSTEM – INSTRUCTION MANUAL 5-1275Figure 5-53: N60 example for four logical device PMUsDepending on the applied filter, the synchrophasors that are produced by PMUs are classified as either P (protection) or M(Measurement) class synchrophasors. Synchrophasors available within the UR that have no filtering applied are classifiedas NONE, which within the standard is classified as PRES OR UNKNOWN under the Calculation Method - ClcMth. EachLogical Device PMU supports one MxxMMXU, MxxMSQI, PxxxMMXU , PxxxMSQI, NxxMMXU, and one NxxMSQI logical node.Figure 5-54: Logical nodes supported in each logical deviceThe following is a summary of LNs that are in each Logical Device (LD2 through LD7):• PxxxMMXU1 ClcMth = P-Class (Note Vaux is mapped to Vneut of MMXU)• PxxxMSQI1 ClcMth = P-CLASS• MxxMMXU1 ClcMth = M-Class (Note Vaux is mapped to Vneut of MMXU)• MxxMSQI1 ClcMth = M-CLASS• NxxMMXU1 ClcMth = M-Class (Note Vaux is mapped to Vneut of MMXU)• NxxMSQI1 ClcMth = M-CLASSNOTEPrecise time input to the relay from the international time standard, via either IRIG-B or PTP, is vital for correctsynchrophasor measurement and reporting. For IRIG-B, a DC level shift IRIG-B receiver must be used for thePMU to output proper synchrophasor values.
