H.16
SEL-700G Relay
Instruction Manual
Date Code 20170814
Synchrophasors
C37.118 Synchrophasor Protocol
Settings Affect
Message Contents
The SEL-700G allows several options for transmitting synchrophasor data.
These are controlled by Global settings described in Settings for
Synchrophasors on page H.4. You can select how often to transmit the
synchrophasor messages (MRATE) and which synchrophasors to transmit
(PHDATAV and PHDATAI). The SEL-700G automatically includes the
frequency and rate-of-change of frequency in the synchrophasor messages.
The frequency and rate-of-change-of-frequency data reported in the packet
depends on the side on which the relay tracks the frequency. Depending on the
model, the relay will track the frequency on either the X-side or Y-side using
positive-sequence voltage or current. Refer to Table H.10 for the side and the
positive-sequence quantity the relay uses for tracking and reporting frequency
and rate-of-change of frequency based on the model.
The relay can include as many as four user-programmable analog values in the
synchrophasor message, as controlled by Global setting NUMANA, and 0 or
16 digital status values, as controlled by Global setting NUMDSW.
The SEL-700G always includes the results of four synchrophasor trigger
reason SEL
OGIC
control equations TREA1, TREA2, TREA3, and TREA4,
and the trigger SEL
OGIC
control equation result PMTRIG, in the
synchrophasor message.
Communications
Bandwidth
A phasor measurement unit (PMU) that is configured to transmit a single
synchrophasor (positive-sequence voltage, for example) at a message rate of
once per second places little burden on the communications channel. As more
synchrophasors, analog values, or digital status words are added, or if the
message rate is increased, some communications channel restrictions come
into play.
The C37.118 synchrophasor message format always includes 18 bytes for the
message header and terminal ID, time information, status bits, and CRC value.
The selection of synchrophasor data, numeric format, programmable analog,
and programmable digital data will add to the byte requirements. You can use
Table H.11 to calculate the number of bytes in a synchrophasor message.
Table H.10
Frequency Tracking Side and Quantity Based on the SEL-700G
Model
SEL-700G Model
Tracking Side and Quantity
SEL-700G0
X-side positive-sequence voltage
SEL-700G0+
X-side positive-sequence voltage
SEL-700G1
X-side positive-sequence voltage
SEL-700G1+
X-side positive-sequence voltage
SEL-700GT
Y-side positive-sequence voltage
SEL-700GT+
X-side positive-sequence voltage
SEL-700GW
X-side positive-sequence current
Summary of Contents for SEL-700G Series
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