Time Synchronization Via Irig-B; Identification; Settings; Operation Principle - Hitachi Relion 650 Series Technical Manual
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- Operation manual (96 pages) ,
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Section 14
Basic IED functions
14.2.7
Time synchronization via IRIG-B
14.2.7.1
Identification
Function description
Time synchronization via IRIG-B
14.2.7.2
Settings
Table 340: IRIG-B Non group settings (basic)
Name
TimeDomain
Encoding
TimeZoneAs1344
Encoding
This type of encoding consists of the following options:
•
IRIG-B. This encoding is based on the legacy (pre-2004) IRIG-B standard which is without any
time zone information. IRIG-B uses the timecoding available in IRIG-B 00x and IRIG-B 12x,
where x = 0-7. When x is set in the range from 4- 7, the year information is provided along with
year and time data.
•
1344. This encoding is based on the current (2004) IRIG-B standard. IED uses the time zone
information from TIMEZONE:1. The setting 1344 refers to the Annex F in IEEE1344, which adds
information regarding quality of the time using the control bits in the IRIG-B message. This
annex also contains the year information with the variable x that ranges from 4-7 in the 2004
version of IRIG-B.
•
1344TZ. This encoding is based on the current (2004) IRIG-B standard. The time zone
information from IRIG-B overrides the TIMEZONE:1 settings.
TimeZoneAs1344
This type of encoding consists of the following options:
•
MinusTZ. Encoded IRIG time minus time zone offset equals UTC at all times.
•
PlusTZ. Encoded IRIG time plus time zone offset equals UTC at all times.
14.2.8
Operation principle
14.2.8.1
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.
374
Values (Range)
Unit
LocalTime
-
UTC
IRIG-B
-
1344
1344TZ
MinusTZ
-
PlusTZ
© 2021 Hitachi Energy. All rights reserved.
IEC 61850
IEC 60617
identification
identification
IRIG-B
-
Step
Default
-
LocalTime
-
IRIG-B
-
PlusTZ
1MRK 511 557-UEN Rev. A
D0E6874T201305151403 v1
ANSI/IEEE C37.2
device number
-
D0E7281T201305151403 v3
Description
Time domain
Type of encoding
Time zone as in 1344 standard
D0E6679T201305151403 v1
D0E6680T201305151403 v1
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