ABB REL650 series, Applications Manual

Page: 479 / 516

• Coordinated Universal Time ( UTC )
• Local time set in the master ( Local )
• Local time set in the master adjusted according to daylight saving time ( Local
with DST )
• TimeSyncMode specifies the time sent by the IED. The time synchronisation is done
using the following ways:
•
IEDTime : The IED sends the messages with its own time.
• LinMasTime : The IED measures the offset between its own time and the master
time, and applies the same offset for the messages sent as in the IEDTimeSkew .
But in LinMasTime it applies the time changes occurred between two
synchronised messages.
• IEDTimeSkew : The IED measures the offset in between its own time and the
master time and applies the same offset for the messages sent.
• EvalTimeAccuracy evaluates time accuracy for invalid time. Specifies the accuracy
of the synchronization (5, 10, 20 or 40 ms). If the accuracy is less than the specified
value, the “Bad Time” flag is raised. To accommodate those masters that are really
bad in time sync, the
EvalTimeAccuracy can be set to Disabled .
According to the standard, the “Bad Time” flag is reported when synchronization has been
omitted in the protection for >23 h.
17.3 Parameter setting group handling
17.3.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Setting group handling SETGRPS - -
Parameter setting groups ACTVGRP - -
17.3.2 Application
Four different groups of settings are available to optimize IED operation for different
power system conditions. By creating and switching between fine tuned setting sets, either
from the local HMI or configurable binary inputs, results in a highly adaptable IED that
can cope with a variety of power system scenarios.
Different conditions in networks with different voltage levels require highly adaptable
protection and control IEDs to best provide for dependability, security and selectivity
requirements. Protection IEDs operate with a higher degree of availability, especially, if
1MRK 506 334-UUS A
Section 17
Basic IED functions
473
Application manual