PRS-7910
PRS-7910 27
The protective device conforms to compatibility level 3.
The following IEC60870-5-103 facilities are supported by this interface:
Initialization (reset)
Time synchronization
Event record extraction
General interrogation
General commands
Disturbance records
9.3.1 Physical Connection and Link Layer
Two EIA RS-485 standardized ports are available for IEC60870-5-103 in this protective device.
The transmission speed is optional: 4800 bit/s, 9600 bit/s, 19200 bit/s or 38400 bit/s.
The link layer strictly abides by the rules defined in the IEC60870-5-103.
9.3.2 Initialization
Whenever the protective device has been powered up, or if the communication parameters have
been changed, a reset command is required to initialize the communications. The protective
device will respond to either of the two reset commands (Reset CU or Reset FCB), the difference
is that the Reset CU will clear any unsent messages in the transmit buffer.
The protective device will respond to the reset command with an identification message ASDU 5,
the COT (Cause Of Transmission) of this response will be either Reset CU or Reset FCB
depending on the nature of the reset command.
9.3.3 Time Synchronization
The protective device time and date can be set using the time synchronization feature of the
IEC60870-5-103 protocol. The protective device will correct for the transmission delay as specified
in IEC60870-5-103. If the time synchronization message is sent as a send/confirm message then
the protective device will respond with a confirmation. Whether the time-synchronization message
is sent as a send confirmation or a broadcast (send/no reply) message, a time synchronization
class 1 event will be generated/produced.
If the protective device clock is synchronized using the IRIG-B input then it will not be possible to
set the protective device time using the IEC60870-5-103 interface. An attempt to set the time via
the interface will cause the protective device to create an event with the current date and time
taken from the IRIG-B synchronized internal clock.
9.3.4 Spontaneous Events
Events are categorized using the following information:
Type identification (TYP)
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