IG-150-EN version 04; 03/10/16
129
General instructions
ekor.rps
Other functions
8. Other functions
8.1. Time setting and synchronization
8.1.1. Time setting
It can be done from the keyboard/display (within "change
settings") or from the protection console (screen 1 "status").
8.1.2. Synchronization
There is an input for synchronization demodulated by
IRIG-B demodulated (see section “IRIG-B input” in “technical
characteristics”). This system allows the time assignation
to events between connected devices to be synchronized
with a 1 ms margin.
The IRIG-B time code is a mesh generated once a second.
The code used is B 003, in which the mesh is constituted
by a pulse train with TTL levels of variable widths. The time
it shows corresponds to PPS (Pulse per second) coinciding
with the mesh reference mark of the mesh.
On integrated control systems (SIPC) the unit is synchronized
periodically (every minute) by the substation control Unit
(UCS).
In this case there will be no use in making a time change
by keyboard or protection console, as this will be soon
eliminated by the UCS.
8.2. Control messages
The protection responds to the following control messages
1. Measurements, changes and counters request
2. Digital status request
3. Clock synchronization
4. Counter freezing
5. Statistical data initialization commands
6. Commands for relays and specied digital signals
7. Statistical data request
The measures transmitted are the ones programmed
among the following. The order in which they are sent is
also programmable. The programming is done through the
protection console SIPCON/P.
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