Signaling; Commands; Time Synchronization - GE DTR GEK-106305A Instruction Manual

In addition to the above described alarms, DTR system allows the user to define another type of events called
Signalings.
The difference between alarms and signalings is that signalings are not shown on the local graphical MMI on the
front of the relay, and they do not require the treatment described for the alarms (acknowledgement, deletion, etc.).
The configured signalings will be sent to upper levels (Level 2 and Level 3) by the communication link as soon as
they are generated. They can also be sent to a local printer if available.
The DTR system allows the user to perform the following operations.
•
SET DATE/TIME.
•
COMMUNICATION TRIGGER
•
STOP REGULATION AUTOMATISM
•
AUTOMATISM IN AUTOMATIC MODE
•
AUTOMATISM IN MANUAL MODE.
•
RAISE THE TAP
•
LOWER THE TAP
•
REMOTE TRIP COMMAND
These operations can be carried out by means of local communications (HMI or communication software), by remote
communications or by pulse inputs (conventional RTU).
The DTR system includes an input for time synchronization. This input requires the connection of a device to supply
a demodulated IRIG-B output. In this way, co-ordinated universal time is measured to a high degree of accuracy and
this makes it possible to tag the events generated by the unit with a resolution of one millisecond.
The use of this input makes it possible to correlate data obtained from different units thanks to synchronization with
GPS satellites. This way, it is possible to obtain very useful information for analysis, cross-referencing the information
provided by different units for a given incident.
Alternatively, it is possible to synchronize units by means of communications, using the GE_LOCAL communications
software, or manually by means of the HMI. If the IRIG_B input is used, it has priority over time setting by
communications, since the time read by IRIG_B is much more accurate.
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2. OPERATION PRINCIPLES
DTR Digital Tap Changer Controller

2.4.2 SIGNALING

2.4.3 COMMANDS

2.4.4 TIME SYNCHRONIZATION

GE—106305A