P74x/EN TD/N
1, P742, P743 (TD) 2-
Technical Data
Mechanical Specification
Design
Modular Px40 platform relay:
P741: Size 16“ case (80TE)
P742: Size 8“ case (40TE)
P743: Size 12“ case (60TE)
Mounting is front of panel flush mounting.
Enclosure Protection
Per IEC 60529: 1992:
IP 52 Protection (front panel) against dust and
dripping water,
IP 50 Protection for the rear and sides of the
case against dust,
IP 10 Product safety protection for the rear due
to live connections on the terminal block
Weight
P741 with 7 comm. boards 7.4 kg
with 1 comm. board 6.2 kg
P742 7.5 kg
P743 9.2 kg
Terminals
AC Current and Voltage Measuring Inputs
P742 and P743 only
Located on heavy duty (black) terminal block:
Threaded M4 terminals, for ring lug
connection.
CT inputs have integral safety shorting, upon
removal of the terminal block.
General Input/Output Terminals
For power supply, opto inputs, output contacts
and COM1 rear communications.
Located on general purpose (grey) blocks:
Threaded M4 terminals, for ring lug
connection.
Case Protective Earth Connection
Two rear stud connections (2 P741, 1 P742/3),
threaded M4.
Must be earthed (grounded) using the
protective (earth) conductor for safety,
minimum wire size 2.5mm
2
.
Front Port Serial PC Interface
EIA RS232 DTE, 9 pin D-type female
connector.
Courier protocol for interface to S1 software.
PEB* rated Maximum cable length 15 m.
Front Download/Monitor Port
EIA RS232, 25 pin D-type female connector.
For firmware downloads.
PEB* rated circuit.
Rear Communications Port
K-Bus/EIA (RS)485 signal levels, two wire
Connections located on general purpose block,
M4 screw.
For screened twisted pair cable, multidrop,
1000 m max.
Courier protocol
SELV* rated circuit
Optional Second Rear Communication Port
EIA(RS)232, 9 pin D-type female connector,
socket SK4.
Courier protocol: K-Bus, EIA(RS)232, or
EIA(RS)485 connection.
Maximum cable run length: 15m.
Optional Rear EIA(RS)232 InterMiCOM Port
For “MODEM” InterMiCOM teleprotection
schemes.
EIA(RS)232, 9 pin D-type female connector,
socket SK5.
Isolation to SELV* level.
Maximum cable run length to MODEM 15m.
Optional Rear IRIG-B Interface modulated
or un-modulated
P741 only
(P742 & P743 synchronized by the P741)
BNC socket
SELV* rated circuit
50 ohm coaxial cable.
*: PEB = Protective equipotential bonded
*: SELV = Safety/Separated extra low voltage
Both PEB and SELV circuits are safe to touch
after a single fault condition.
Optical Fiber Connection
BFOC 2.5 (ST®) interface for multi-mode glass
fibre type 62.5/125 µm, as per IEC 874-10, 850
nm short-haul fibres, one Tx and one Rx.
Optical budget: 5.6 dB
Data rate:2.5 Mbits
Max Length: 1000 m
Optional Rear Ethernet Connection for IEC
61850
10BaseT / 100BaseTX Communications
Interface in accordance with IEEE802.3 and
IEC61850
Isolation: 1.5kV
Connector type: RJ45
Cable type: Screened Twisted Pair (STP)
Max. cable length: 100m
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