Logical nodes for generic references............................................. 215Generic automatic process control GAPC.................................215Generic process I/O GGIO........................................................ 216Logical nodes for metering and measurement............................... 228Metering MMTR.........................................................................228Measurement MMXU.................................................................233Harmonic measurement MHAI.................................................. 245Sequence and imbalance MSQI................................................260Logical nodes for sensors and monitoring......................................264Circuit breaker monitoring SCBR.............................................. 264Tap changer supervision SLTC................................................. 269Operation time counter SOPT................................................... 270Hot-spot and ageing rate monitoring SPTR...............................272Logical nodes for switchgear.......................................................... 274Circuit breaker XCBR................................................................ 274Switch XSWI..............................................................................277Logical nodes for further power system equipment........................279Battery ZBAT............................................................................. 279Logical nodes for power quality events.......................................... 280Voltage variation QVVR.............................................................280Voltage unbalance variation QVUB........................................... 288Section 8 Glossary....................................................................... 293Table of contents630 series 3Communication Protocol Manual
