ABB Relion 670 Series Applications Manual page 559

1MRK 511 401-UEN Rev. K
Function description
Voltage delta
supervision, 2 phase
DELSPVC
21.3.4.2 Setting examples for IEC/UCA 61850-9-2LE and time synchronization
The IED and the Merging Units (MU) should use the same time reference especially if analog
data is used from several sources, for example from an internal TRM and an MU, or if several
physical MUs are used. Having the same time reference is important to correlate data so that
channels from different sources refer to the correct phase angle.
When only one MU is used as an analog source, it is theoretically possible to do without time
synchronization. However, this would mean that timestamps for analog and binary data/
events become uncorrelated. If the IED has no time synchronization source configured, then
the binary data/events will be synchronized with the merging unit. However, the global/
complete time might not be correct. Disturbance recordings then appear incorrect since
analog data is timestamped by MU, and binary events use the internal IED time. It is thus
recommended to use time synchronization also when analog data emanate from only one MU.
An external time source can be used to synchronize both the IED and the MU. It is also possible
to use the MU as a clock master to synchronize the IED from the MU. When using an external
clock, it is possible to set the IED to be synchronized via PPS,IRIG-B or PTP. It is also possible to
use an internal GPS receiver in the IED (if the external clock is using GPS).
Bay control REC670
Application manual
IEC 61850 identification
DELVSPVC
Current harmonic
monitoring, 2 phase
© Copyright 2017 Hitachi Power Grids. All rights reserved
Function description
Current delta
supervision, 2 phase
CHMMHAN
Section 21
Station communication
IEC 61850 identification
DELISPVC
GUID-CEDD520A-8A13-41DF-BFF1-8A3B4C00E098 v3
553