P74x/EN FD/N
1, P742, P743
(FD) 9-
1.2.3 Platform software
The platform software deals with the management of the relay settings, the user interfaces
and logging of event, alarm, fault and maintenance records. All of the relay settings are
stored in a database within the relay that provides direct compatibility with Courier
communications. For all other interfaces (i.e. the front panel keypad, LCD interface and IEC
61850) the platform software converts the information from the database into the format
required.The platform software notifies the protection & control software of all settings
changes and logs data as specified by the protection & control software.
1.2.4 Communication software
The communication software manages optical fibre communication between the central unit
and the peripheral units. This includes the control of data exchanged transmitted and the
synchronisation of peripheral units. With this object, the communication software interfaces
with the sequencer used in coprocessors boards.
1.2.5 Protection & control software
The protection and control software performs the calculations for all of the protection
algorithms of the relays. This includes digital signal processing such as Fourier filtering and
ancillary tasks such as the measurements. The protection & control software interfaces with
the platform software for settings changes and logging of records, and with the system
services software for acquisition of sample data and access to output relays and digital opto-
isolated inputs.
1.2.6 Disturbance recorder
The analogue values and logic signals are routed from the protection and control software to
the disturbance recorder software. The platform software interfaces to the disturbance
recorder to allow extraction of the stored records.
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