GE P444

P
44x/EN MT/Hb6
Maintenance
(MT) 10
-8 MiCOM P40 Agile P442,
P444
P442
J H G F E D C B A
Power supply
Relay board
Relay board
Relay Board (or
optional high break
Opto-
input board
Opto-
input board
Transformer board
Optional board
Optional board
P444
N M L K J H G F E D C B A
Power supply
Relay Board
Relay Board (or
optional high break
Relay Board (or
optional high break
Relay Board
(or
optional
high break
l)
Relay board (option)
Relay board (option)
Opto-
input boar
d
Opto-
input board
Opto-
input board
Transformer board
Optional board
Optional board
Figure 2 - P44x PCB/Module Locations (Viewed from front)
The PCBs within the relay are now accessible, Figure 2 show the PCB locations for the
distance relays in size 60TE (P442).
The 64-way ribbon cable to the front panel also provides the electrical connections between
PCBs with the connections being via IDC connectors.
The slots inside the case to hold the PCBs securely in place each correspond to a rear
terminal block. Looking from the front of the relay these terminal blocks are labelled from
right to left.
Note: To ensure compatibility, always replace a faulty PCB with one of an identical part
number. Table 1 lists the part numbers of each PCB type.