ABB Relion REG670, Technical Manual

Page: 1202 / 1298

All communication between the GCM and the NUM is via the PCI-bus. PPS time data
is sent from the GCM to the rest of the time system to provide 1μs accuracy at
sampling level. An optical transmitter for PPS output is available for time
synchronization of another relay with an optical PPS input. The PPS output connector
is of ST-type for multimode fibre and could be used up to 1 km.
21.2.17.3 Monitored data
Table 926: SYNCHGPS Monitored data
Name Type Values (Range) Unit Description
NoOfSatellites INTEGER - - Number of GPS signals
from satellites
21.2.17.4 Technical data
Table 927: GPS time synchronization module (GTM)
Function Range or value Accuracy
Receiver – ±1µs relative UTC
Time to reliable time reference with antenna in new
position or after power loss longer than 1 month
<30 minutes –
Time to reliable time reference after a power loss longer
than 48 hours
<15 minutes –
Time to reliable time reference after a power loss shorter
than 48 hours
<5 minutes –
21.2.18 GPS antenna
21.2.18.1 Introduction
In order to receive GPS signals from the satellites orbiting the earth a GPS antenna
with applicable cable must be used.
21.2.18.2 Design
The antenna with a console for mounting on a horizontal or vertical flat surface or on
an antenna mast. See figure
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Section 21
1MRK502052-UEN B
IED hardware
1196
Technical manual