Areva MiCom P120, Техническое руководство

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P12x/EN CT/A96 Communications
IIEC 60870-5-103
Page 4/248
MiCOM P120/P121/P122/P123
1.4 Spontaneous events
The events 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 events
that cannot be passed using the standardised messages will not be sent.
Events are categorised using the following information:
•
Common Address
•
Function Type
•
Information number
APPENDIX 1 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 standardised messages. For example if the relay
produces starts and trips for three stages of overcurrent only two stages can be passed
using the standardised messages.
Using the different common address for two of the overcurrent stages allows each stage to
be indicated. The table in APPENDIX 1 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.
1.5 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 1.
1.6 Cyclic measurements
The relay will produce measured values using ASDU 9 on a cyclical basis, this can be read
from the relay using a Class 2 poll (note ADSU 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 1.
1.7 Commands
A list of the supported commands is contained in APPENDIX 1. The relay will respond to
other commands with an ASDU 1, with a cause of transmission (COT) of negative
acknowledgement of a command.
1.8 Disturbance records (P120, P122 & P123 only)
The disturbance records stored by the relay cannot be extracted using the mechanism
defined in the IEC60870-5-103 standard. The relay maintains compatibility with the VDEW
control system by transmitting an ASDU 23 with no disturbance records at the start of every
GI cycle.
1.9 Blocking of monitor direction
The relay does not support a facility to block messages in the Monitor direction.IEC 60870-5-
103 DATABASES