Alstom MiCOM P546 - 2.2.2 General features & implementation

P54x/EN OP/La4 Operation
(OP) 5-118 MiCOM P543, P544, P545 & P546
OP
Security
Dependability
Speed
low
faster
slower
high
Direct
Intertrip
Permissive
Blocking
P1342ENa
Figure 76 Pictorial comparison of operating modes
This diagram shows that a blocking signal should be fast and dependable; a direct intertrip
signal should be very secure and a permissive signal is an intermediate compromise of
speed, security and dependability.
In InterMiCOM
64
applications, the framing and error checking of a single command message
is sufficient to meet the security of a permissive application, whilst the speed is sufficiently
fast to meet the needs of a blocking scheme. Accordingly in InterMiCOM
64
applications,
there is no differentiation between blocking commands or permissive commands, so that
only signals being used for direct intertripping with higher security requirements need to be
differentiated from those in permissive (or blocking) schemes.
2.2.2 General features & implementation
InterMiCOM
64
provides a direct fiber output from the relay’s co-processor board that can be
connected either directly to the protection at the opposite end(s) or through a MUX device as
describe on section 2.1
InterMiCOM
64
can work:
 With Differential protection (In this case differential protection is enabled) or
 Standalone (In this case differential protection is disabled and InterMiCOM
64
is enabled)
The number of available teleprotection commands is 8. In Dual redundant schemes 8
commands per channel are transmitted to and received from the remote end. In 3 ended
configurations, 8 commands are transmitted bidirectional between each and every pair of
relays. Unique relay addressing is available to prevent any spurious operation should a
multiplexer inadvertently fall out of step and misroute messages.