Operation Principle; General Concepts - ABB RED650 Technical Manual

1MRK 505 394-UEN A
Table 584: PTP Non group settings (advanced)
Name Values (Range)
Domain
Priority1
Priority2
21.1.3
21.1.3.1
Line differential protection RED650 2.2 IEC
Technical manual
Unit
0 - 127 -
0 - 255 -
0 - 255 -

Operation principle

General concepts

Time definitions
The error of a clock is the difference between the actual time of the clock, and the
time the clock is intended to have. Clock accuracy indicates the increase in error,
that is, the time gained or lost by the clock. A disciplined clock knows its own
faults and tries to compensate for them.
Design of the time system (clock synchronization)
The time system is based on software and hardware clocks that run independently
from each other (see Figure 361).
Step Default
1 0
1 128
1 128
Section 21
Basic IED functions
Description
0 = Default domain, 1-3 = Alternative
domain, 4-127 = User defined
The clock with the lowest priority 1
becomes the reference clock (Grand
Master)
If all the relevant values for selecting the
reference clock are the same for multiple
devices, the clock with the lowest priority
2 is selected as the reference clock
(Grand Master)
GUID-E2B9E81C-5733-4521-B27F-BF33E05CCFB0 v8
PID-6630-SETTINGS v2
IP12360-1 v4
M11346-77 v1
M11346-80 v3
779