H.13
Date Code 20081022 Instruction Manual SEL-787 Relay
Synchrophasors
C37.118 Synchrophasor Protocol
Protocol Operation
The SEL-787 will only transmit synchrophasor messages over serial ports that
have setting PROTO := PMU. The connected device will typically be a
synchrophasor processor, such as the SEL-3306. The synchrophasor processor
controls the PMU functions of the SEL-787, with IEEE C37.118 commands,
including commands to start and stop synchrophasor data transmission, and
commands to request a configuration block from the relay, so the
synchrophasor processor can automatically build a database structure.
Transmit Mode Control
The SEL-787 will not begin transmitting synchrophasors until an enable
message is received from the synchrophasor processor. The relay will stop
synchrophasor transmission when the appropriate command is received from
the synchrophasor processor. The SEL-787 can also indicate when a
configuration change occurs, so the synchrophasor processor can request a
new configuration block and keep its database up-to-date.
The SEL-787 will only respond to configuration block request messages when
it is in the non-transmitting mode.
NOTE: Only one serial port can be
set to PROTO:=PMU at one time.
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