GE Multilin D30 Line Distance Protection System C-7APPENDIX C C.3 SERVER FEATURES AND CONFIGURATIONCC.3.6 LOGICAL NODE NAME PREFIXESIEC 61850 specifies that each logical node can have a name with a total length of 11 characters. The name is composed of:• A five or six-character name prefix.• A four-character standard name (for example, MMXU, GGIO, PIOC, etc.).• A one or two-character instantiation index.Complete names are of the form xxxxxxPIOC1, where the xxxxxx character string is configurable. Details regarding thelogical node naming rules are given in IEC 61850 parts 6 and 7-2. It is recommended that a consistent naming conventionbe used for an entire substation project.C.3.7 CONNECTION TIMINGA built-in TCP/IP connection timeout of two minutes is employed by the D30 to detect ‘dead’ connections. If there is no datatraffic on a TCP connection for greater than two minutes, the connection will be aborted by the D30. This frees up the con-nection to be used by other clients. Therefore, when using IEC 61850 reporting, clients should configure report controlblock items such that an integrity report will be issued at least every 2 minutes (120000 ms). This ensures that the D30 willnot abort the connection. If other MMS data is being polled on the same connection at least once every 2 minutes, this time-out will not apply.C.3.8 NON-IEC 61850 DATAThe D30 relay makes available a number of non-IEC 61850 data items. These data items can be accessed through the“UR” MMS domain. IEC 61850 data can be accessed through the standard IEC 61850 logical device. To access the non-IEC data items, the INCLUDE NON-IEC DATA setting must be “Enabled”.C.3.9 COMMUNICATION SOFTWARE UTILITIESThe exact structure and values of the supported IEC 61850 logical nodes can be seen by connecting to a D30 relay with anMMS browser, such as the “MMS Object Explorer and AXS4-MMS” DDE/OPC server from Sisco Inc.
