Operation P54x/EN OP/La4
MiCOM P543, P544, P545 & P546
(OP) 5-107
OP
Figure 74 Transient bias characteristic
2.1.7 Switched communication networks with permanent o
r semi-permanent split routings
MiCOM P54x relays, utilizing timing information from the GPS system, are suitable for use
on switched communication signaling channels for the differential protection. For correct
operation of this protection element, it is essential that the integrity of this link is continuously
checked. It is not, however, a requirement that ‘go’ (tp1) and ‘return’ (tp2) times are similar if
the GPS synchronization feature is used.
2.1.8 P590 Series optical fiber to electrical interface units
In order to
connect the P54x relays via a pulse code modulation (PCM) multiplexer network
or digital communication channel, Type P590 type interface units are required. The following
interface units are available:
P591 interface to multiplexing equipment supporting ITU-T (formerly CCITT)
Recommendation G.703 co-directional electrical interface
P592 interface to multiplexing equipment supporting ITU-T Recommendation V.35
electrical interface
P593 interface to multiplexing or ISDN equipment supporting ITU-T Recommendation
X.21 electrical interface
The data rate for each unit can be 56 kbit/sec or 64 kbit/sec as required for the data
communications link.
One P590 unit is required per relay data channel (i.e. for each transmit and receive signal
pair). It provides optical to electrical and electrical to optical signal conversion between the
P54x relay and the multiplexer. The interface unit should be located as close to the PCM
multiplexer as possible, to minimize any effects on the data of electromagnetic noise or
interference.
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