ABB Relion REQ650, Руководство по применению

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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 Off .
According to the standard, the “Bad Time” flag is reported when synchronization has
been omitted in the protection for >23 h.
15.3 Parameter setting group handling
15.3.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Setting group handling SETGRPS - -
Parameter setting groups ACTVGRP - -
15.3.2 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 the setting values of their parameters are continuously optimized according to the
conditions in the power system.
Operational departments can plan for different operating conditions in the primary
power system equipment. The protection engineer can prepare the necessary
optimized and pre-tested settings in advance for different protection functions.
different groups of setting parameters are available in the IED. Any of them can be
activated through the different programmable binary inputs by means of external or
internal control signals.
The four different groups of setting parameters are available in the IED. Any of them
can be activated through different inputs by means of external programmable binary
or internal control signals.
1MRK 505 291-UEN A
Section 15
Basic IED functions
301
Application manual