2 FIBRE TELEPROTECTION IMPLEMENTATION
The Fibre Teleprotection interface is an integral part of the Current Differential protection implementation for this
pr
oduct. It provides the communications necessary for the Current Differential protection schemes as well as
intertripping command signalling which can be freely allocated to realise protection schemes such as Permissive
and Blocking schemes.
Each product can have up to 2 fibre-optic communications channels for teleprotection signalling. A range of
different fibre-optic interfaces are available to provide:
● Direct fibre connections between devices with a number of options available to suit different requirements
● Indirect connections using the industry standard IEEE C37.94. Fibre-optic connections are made between
the product and telecommunications equipment that supports industry standard fibre-optic interfaces (IEEE
C37.94). The TELECOMMUNIcations equipment provides the end-to-end service.
Signals to be communicated between devices are constructed into packets (sometimes called telegrams). These
packets include addressing, timing, and error checking information as well as teleprotection commands and data.
They are transmitted between terminals at frequent regular intervals. Upon reception, they are checked for
integrity before the contents are used.
Allocation of teleprotection commands is realised with mappings between InterMiCOM 64 signals and internal DDB
logic signals using the product’s Programmable Scheme Logic (PSL).
2.1 COMMUNICATION SETUP
To use the fibre teleprotection features in this product, you will need to configure the protection signalling scheme.
The pr
otection signalling scheme is defined by the number of connected terminals, together with the
communications links between them.
Products can have either 1 physical fibre teleprotection channel, or two. Products with 1 physical fibre
teleprotection channel can be used to connect two products together into a scheme. Products with 2 physical fibre
teleprotection channels can be used to connect up to six products together into a scheme, or they can be used to
connect two products together into a scheme with dual communications channels to provide communications
redundancy (hot standby) in the event of a single communications channel failure.
The physical connections are labelled as Ch1 and Ch2.
In a two-terminal scheme, channel 1 of one device should always connect to channel 1 of the other device. For a
two-terminal scheme with dual redundant communications, it follows that channel 2 of one device should connect
to channel 2 of the other.
In three to six terminal schemes, channel 1 of one device should always connect to channel 2 of the next device in
the ring, as shown in the figure below:
Chapter 15 - Fibre Teleprotection P54A/B/C/E
314 P54xMED-TM-EN-1
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