P92x/EN CT/E11 Technical Guide
IEC 60870-5-103
Page 110/118 MiCOM P921-P922-P923
4.3 Time Synchronization (P922 & P932 only)
The relay time and date can be set using the time synchronization feature of the
IEC60870-5-103 protocol. The relay will correct the transmission delay as specified
in the IEC60870-5-103. If the time synchronization message is sent as a
send/confirm message then the relay will respond with a confirm. If the time
synchronization message is sent as a sent/confirm or broadcast (send/no reply)
message, a time synchronization message will be returned as class 1 data.
4.4 Spontaneous Events (P922 & P923 only)
The event created by the relay will be passed using the standard function
type/information numbers to the IEC60870-5-103 master station. Private codes are
not used, thus any event that can not pass using standardized messages will not be
sent
Events are categorized using the following information:
· Common Address
· Function type
· Information number
APPENDIX 2 contains a complete listing of all events produced by the relay. The
common address is used to differentiate in circumstances where the relay produces
more events of a certain type than can be passed using the standardized messages.
For example if the relay produces starts and trips for three stages of overcurrent only
two stages can pass using the standardized messages.
Using the different common address for two of the overcurrent stages allows each
stage to be indicated. The table in APPENDIX 2 shows the common address as an
offset value. The common address offset will be added to the station address in
order to pass these events.
4.5 General Interrogation
The GI request can be used to read the status of the relay. The function numbers,
information numbers and common address offsets that will be returned during the GI
cycle are indicated in APPENDIX 2.
4.6 Cyclic Measurements
The relay will produce measured value using ASDU 9 on a cyclic basis, this can be
read from the relay using a class 2 poll ( note ASDU 3 is not used ).
It should be noted that the measurands transmitted by the relay are sent as a
proportion of either 1.2 or 2.4 times the rated value of the analogue value. The
selection of either 1.2 or 2.4 for a particular value is indicated in APPENDIX 2.
4.7 Commands
A list of the supported commands is contained in APPENDIX 2. The relay will respond
to other commands with an ASDU 1, with a cause of transmission (COT) of negative
acknowledgement of a command.
To Next Page
Loading...
