Mechanical Layout - GE MiCOM P40 Agile Technical Manual

Firmware Design
MiCOM P40 Agile P442, P444
For all copper based network connections an RJ45 style connector is supported. 10 Mbit/s
fibre network connections use an ST style connector while 100 Mbit/s connections use the
SC style fibre connection. An extra processor, a Motorola PPC, and memory block is fitted to
the Ethernet card that is responsible for running all the network related functions such as
TCP/IP/OSI as supplied by VxWorks and the UCA2/MMS server as supplied by Sisco inc.
The extra memory block also holds the UCA2 data model supported by the relay.
2.9

Mechanical layout

The case materials of the relay are constructed from pre-finished steel which has a
conductive covering of aluminium and zinc. This provides good earthing at all joints giving a
low impedance path to earth which is essential for performance in the presence of external
noise. The boards and modules use a multi-point earthing strategy to improve the immunity
to external noise and minimise the effect of circuit noise. Ground planes are used on boards
to reduce impedance paths and spring clips are used to ground the module metalwork.
Heavy duty terminal blocks are used at the rear of the relay for the current and voltage signal
connections. Medium duty terminal blocks are used for the digital logic input signals, the
output relay contacts, the power supply and the rear communication port. A BNC connector
is used for the optional IRIG-B signal. 9-pin and 25-pin female D-connectors are used at the
front of the relay for data communication.
Inside the relay the PCBs plug into the connector blocks at the rear, and can be removed
from the front of the relay only. The connector blocks to the relay's CT inputs are provided
with internal shorting links inside the relay which will automatically short the current
transformer circuits before they are broken when the board is removed.
The front panel consists of a membrane keypad with tactile dome keys, an LCD and 12
LEDs mounted on an aluminium backing plate.
P44x/EN FD/Hb6
(FD) 8-15