Fibre Teleprotection Implementation - GE MiCOM P40 Agile Technical Manual

Chapter 20 - Fibre Teleprotection
3

FIBRE TELEPROTECTION IMPLEMENTATION

The Fibre Teleprotection interface is an integral part of the Current Differential protection implementation for this
product. 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.
If Current Differential protection is enabled, Fibre Teleprotection is enabled automatically. If you choose to disable
the Current Differential protection, you can still use the Fibre Teleprotection feature for teleprotection command
signalling. To do this you must enable the InterMiCOM 64 setting in the CONFIGURATION column. This setting will
only be visible if Current Differential protection is disabled.
If you enable Fibre Teleprotection but have current differential protection disabled, the CURRENT DIFF column will
be invisible. To re-enable Current Differential protection you must first set the InterMiCOM 64 setting in the
CONFIGURATION column to disabled. Enabling Current Differential protection will then automatically enable Fibre
Teleprotection and the InterMiCOM 64 setting in the CONFIGURATION column will disappear.
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.
Fibre-optic connection in conjunction with proprietary auxiliary interface units to provide connection to
●
standard electrical telecommunications interfaces (G.703, V.35, X.21). With this indirect connection method,
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,
and 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 the Programmable Scheme Logic (PSL).
3.1 SETTING UP THE IM64 SCHEME
To use the fibre teleprotection features in this product, you will need to configure the protection signalling scheme.
The protection 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 three 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.
For products with 2 physical fibre teleprotection channels use the Scheme Setup setting in the PROT COMMS/IM64
column. The choices are 3 Terminal, 2 Terminal (only physical Ch1 is used), and Dual Redundant (two
terminals with two interconnecting channels).
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 a three terminal scheme, channel 1 of one device should always connect to channel 2 of another device as
shown in the figure below.
502
P543i/P545i
P54x1i-TM-EN-1