Technical Data; Time System; Functionality; Time Synchronization Timesynchgen - Hitachi Relion 650 Series Technical Manual

Section 14
Basic IED functions
The technique to split the analog input signal into two A/D converter(s) with different amplification
makes it possible to supervise the A/D converters under normal conditions where the signals from
the two A/D converters should be identical. An alarm is given if the signals are out of the boundaries.
Another benefit is that it improves the dynamic performance of the A/D conversion.
The self-supervision of the A/D conversion is controlled by the ADx_Controller function. One of the
tasks for the controller is to perform a validation of the input signals. The ADx_Controller function is
included in all IEDs equipped with an analog input module. This is done in a validation filter which
has mainly two objects: First is the validation part that checks that the A/D conversion seems to work
as expected. Secondly, the filter chooses which of the two signals shall be sent to the CPU, that is
the signal that has the most suitable signal level, the ADx_LO or the 16 times higher ADx_HI.
When the signal is within measurable limits on both channels, a direct comparison of the two A/D
converter channels can be performed. If the validation fails, the CPU will be informed and an alarm
will be given for A/D converter failure.
The ADx_Controller also supervises other parts of the A/D converter.
14.1.5

Technical data

Table 334: Self supervision with internal event list
Data
Recording manner
List size
14.2

Time system

14.2.1

Functionality

The time synchronization source selector is used to select a common source of absolute time for the
IED when it is a part of a control and protection system. This makes it possible to compare event and
disturbance data between all IEDs in a station automation system.
14.2.2

Time synchronization TIMESYNCHGEN

14.2.2.1

Identification

Function description
Time synchronization
370
Micro SCADA OPC server should not be used as a time synchronization source.
IEC 61850
identification
TIMESYNCHGE
N
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Value
Continuous, event controlled
40 events, first in-first out
IEC 60617 ANSI/IEEE C37.2
identification device number
-
1MRK 511 557-UEN Rev. A
D0E7190T201305151403 v1
D0E6698T201305151403 v1
D0E6708T201305151403 v1
D0E6869T201305151403 v1
-
Technical Manual