Alstom MiCOM P54 Series - 3.5.3.2 Scheme 3 PSL; 3.6 Intermicom64 application example; 3.6.1 InterMiCOM64 mapping for three ended application - BLOCKING or PUR example

P54x/EN AP/La4 Application Notes
(AP) 6-66 MiCOM P543, P544, P545 & P546
AP
Note: Scheme 3 is not compatible with auxiliary supply voltages of 30/34
volts and below.
3.5.3.2 Scheme 3 PSL
The PSL for schem
e 3 is identical to that of scheme 1 (see Figure 21).
3.6 Intermicom
64
application example
The protection signaling channels of the P54x primarily intended to provide the capability for
implementing current differential protection are also capable of supporting InterMiCOM
64
teleprotection. If the P54x is configured to provide differential protection, then the
InterMiCOM
64
commands (IMx command) are transmitted together with the current
differential signals. If the differential protection of the P54x is not being employed, then the
communications messages are restructured to provide InterMiCOM
64
signaling of the type
supported by the MiCOMho P446, P443 and P445 relays. In either case, the fundamental
operation of the InterMiCOM
64
commands is the same, but the way in which communications
failures are handled differs. In a differential scheme, failure or disturbance of
communications could cause failure of the protection scheme and the alarming requirements
are high. In a scheme where differential protection is not being employed, and InterMiCOM
64
is being employed to transfer command status between the line ends, communications
disturbances may be less critical and this is reflected in the InterMiCOM
64
implementation of
P446, P443 and P445.
An example of how to apply an InterMiCOM
64
scheme is given below. This assumes that the
P54x has been configured as a P443/5 (i.e. no differential protection) and takes account of
different level of communication disturbance alarming provided in this configuration. It is
also assumed that the optional distance protection is included. This example should be read
in conjunction with the InterMiCOM
64
section of the operation (OP) section of the MiCOMho
P446, P443 or P445 Technical Manual.
3.6.1 InterMiCOM
64
mapping for three ended application – BLOCKING or PUR example
The following figure shows a suggested InterMiCOM
64
mapping: