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Section 6
Wide area measurement system
126
synchrophasor data are sent via the PHASORS field of data frame
organization of IEEE C37.118.2 message format. Depends on the phasor
data type, the size of PHASORS field can be 4 (Integer) or 8 (Float)
bytes per IEEE C37.118.2 message.
Integer data type for the phasors corresponds to a 16-bit integer value. It
represents a 16-bit signed integer, range –32 767 to +32 767, in
rectangular format, and in polar format it represents a 16-bit unsigned
integer range 0 to 65535 for the magnitude and a 16-bit signed integer, in
4
radians × 10
, range –31 416 to +31 416 for the angle.
Float data type for the phasors corresponds to 32-bit values in IEEE
floating-point format. In rectangular format, it represents real and
imaginary, in engineering units (real value first) and in polar format it
represents magnitude and angle, in engineering units (magnitude first)
and angle in radians, range –π to + π.
•
AnalogDataType: It refers to the Bit 2 of the FORMAT field of the
configuration frames 1, 2 and 3 organization defined in IEEE C37.118.2
message format. Here the user can select the type of the analog data
which are reported along with the synchrophasor data over IEEE
C37.118.2 message. The options are Integer or Float data corresponding
to the 16-bit integer or 32-bit IEEE floating-point values, respectively.
The analog data could be sampled data such as control signal or
transducer values, or it can be active and reactive power measurement
values from each feeder in the substation. Values and ranges are
separately defined by user via the parameter settings related to the
ANALOGREPORT function block. The analog data are sent via the
ANALOG field of data frame organization of IEEE C37.118.2 message
format. Depends on the analog data type, the size of ANALOG field can
be 2 (Integer) or 4 (Float) bytes per IEEE C37.118.2 message. More
information is available under the section
ANALOGREPORT
•
FrequencyDataType: It refers to the Bit 3 of the FORMAT field of the
configuration frames 1, 2 and 3 organization defined in IEEE C37.118.2
message format. Here the user can select the type of the frequency-
deviation and rate-of-change-of-frequency data (FREQ/DFREQ) which
can be reported along with the synchrophasor data over IEEE C37.118.2
message. The options are Integer or Float data corresponding to the 16-
bit integer or 32-bit IEEE floating-point value, respectively.
The frequency-deviation and rate-of-change-of-frequency data are sent
via the FREQ and DFREQ fields of data frame organization of IEEE
C37.118.2 message format. Depends on the selected data type, the size of
each field can be 2 (Integer) or 4 (Float) bytes per IEEE C37.118.2
message.
The data sent via the FREQ field is frequency deviation from nominal
frequency (50 Hz or 60 Hz), in mHz. It is ranged from –32.767 to
+32.767 Hz. Integer data type for frequency-deviation data represents
16-bit signed integers, range –32 767 to +32 767 32, and Float data type
represents actual frequency value in IEEE floating-point format.
The data sent via the DFREQ field is Rate Of Change Of Frequency
(ROCOF), in Hertz per second times 100. It is ranged from –327.67 to
Scaling Factors for
channels.
Line distance protection REL670 2.2 IEC
1MRK 506 369-UEN B
Application manual
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