18.34
SEL-400 Series Relays Instruction Manual Date Code 20171006
Synchrophasors
Control Capabilities
The implementation using the extended frame in the C37.118 synchrophasor
packet makes it possible to send Fast Operate commands and synchrophasor data
over the same Ethernet session. The Fast Operate command is embedded in the
extended frame of the C37.118 command frame. See the following example for
configuration and setup of the C37.118 extended frame implementation.
Should you need to change the relay protection scheme because of system con-
figuration or to shed bus load to maintain voltage quality, you can use the
SEL-3378 to send control commands to the relay according to a programmed
algorithm. You can set a remote bit in the relay to change the group settings for
an alternate protection scheme or send a PULSE command to the circuit breaker
to disconnect load from the system.
To set the relay for such a control scenario, first configure synchrophasors for the
C37.118 protocol. Figure 18.8 depicts one way to configure synchrophasors for
transport. In this SEL-487E example all of the S- and T-terminal phase currents
and Z-terminal voltages along with the positive-sequence values are being trans-
mitted in polar floating point format at a message rate of 60 messages per second.
The filter settings are configured for a fast response with phase compensation.
Example 18.1 Synchrophasor Control Application
Refer to Table 18.15 for an example of a PMU communications network
with a synchrophasor vector processor (SVP) collecting and analyzing syn-
chrophasor data in the network, based on a programmed power flow and
voltage regulation scheme. Each of the depicted PMU/IEDs are connected to
a load, feeder line, or generation facility streaming synchrophasors to the SVP.
Figure 18.7 Synchrophasor Control Application
SEL–3378
SVP
Relay
Synchrophasor
Measurements
Fast Op Commands
PMU/IED
PMU/IED
PMU/IED
PMU/IED
PMU/IED
PMU/IED
Relay
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