Alstom MiCOM P846, Техническое руководство

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P846/EN FD/D Firmware Design
(FD) 9-8
MiCOM P846
FD
In the Opto Config. menu the nominal battery voltage can be selected for all opto inputs by
selecting one of the five standard ratings in the Global Nominal V settings. If Custom is
selected then each opto input can individually be set to a nominal voltage value.
Setting Range
Menu Text Default Setting
Min. Max.
Step Size
OPTO CONFIG
Global Nominal V 24-27
24 - 27, 30 - 34, 48 - 54, 110 - 125,
220 - 250, Custom
Opto Input 1 24-27
24 - 27, 30 - 34, 48 - 54, 110 - 125,
220 - 250
Opto Input 2-32 24-27
24 - 27, 30 - 34, 48 - 54, 110 - 125,
220 - 250
Opto Filter Cntrl. 111111111111
Characteristic Standard 60% - 80% Standard 60% - 80%, 50% - 70%
Each opto input also has a pre-set filter of ½ cycle which renders the input immune to
induced noise on the wiring; although this method is secure it can be slow, particularly for
intertripping.
1.3.5 Power supply module (including output relays)
The power supply module contains two PCBs, one for the power supply unit itself and the
other for the output relays. The power supply board also contains the input and output
hardware for the rear communication port which provides an EIA(RS)485 communication
interface.
1.3.5.1 Power supply board (including EIA(RS)485 communication interface)
One of three different configurations of the power supply board can be fitted to the relay.
This will be specified at the time of order and depends on the nature of the supply voltage
that will be connected to the relay. The three options are shown in table 1 below:
Nominal dc Range Nominal ac Range
24/54 V DC only
48/125 V 30/100 Vrms
110/250 V 100/240 Vrms
Table 1: Power supply options
The output from all versions of the power supply module are used to provide isolated power
supply rails to all of the other modules within the relay. Three voltage levels are used within
the relay, 5.1V for all of the digital circuits, ±16V for the analog electronics, e.g. on the input
board, and 22V for driving the output relay coils. All power supply voltages including the 0V
earth line are distributed around the relay via the 64-way ribbon cable. The power supply
board provides one further voltage level that is the field voltage of 48V. This is brought out
to terminals on the back of the relay so that it can be used to drive the optically isolated
digital inputs.
The two other functions provided by the power supply board are the EIA(RS)485
communications interface and the watchdog contacts for the relay. The EIA(RS)485
interface is used with the relay’s rear communication port to provide communication using
one of either Courier or DNP3.0 protocols. The EIA(RS)485 hardware supports half-duplex
communication and provides optical isolation of the serial data being transmitted and
received. All internal communication of data from the power supply board is conducted via
the output relay board that is connected to the parallel bus.
The watchdog facility provides two output relay contacts, one normally open and one
normally closed that are driven by the processor board. These are provided to give an
indication that the relay is in a healthy state.