ABB REC670 Applications Manual page 127

1MRK 511 401-UEN A
Bay control REC670 2.2 IEC
Application manual
+327.67 Hz per second. Integer data type for ROCOF data represents 16-
bit signed integers, range –32 767 to +32 767 32, and Float data type
represents actual value in IEEE floating-point format.
• SendFreqInfo: Enables/Disables sending of the frequency-deviation and
Rate Of Change Of Frequency (ROCOF) data by choosing On/Off
setting.
• ReportRate: It refers to the 2-byte DATA_RATE field of the
configuration frames 1, 2 and 3 organization defined in IEEE C37.118.2
message format. The DATA_RATE field is identifying the Rate of
phasor data transmissions by a 2-byte integer word (–32 767 to +32 767).
Here the user can select the synchrophasor data reporting rate from the
PMU based on the number of frames per second.
In general, the IED has 5 different reporting rates (10, 25, 50, 100, 200
fr/s) on the 50 Hz system frequency, and has 8 different reporting rates
(10, 12, 15, 20, 30, 60, 120, 240 fr/s) on the 60 Hz system frequency.
The options are as follows:
• 10/10 fr/s (60/50Hz)
• 12/10 fr/s (60/50Hz)
• 15/10 fr/s (60/50Hz)
• 20/25 fr/s (60/50Hz)
• 30/25 fr/s (60/50Hz)
• 60/50 fr/s (60/50Hz)
• 120/100 fr/s (60/50Hz)
• 240/200 fr/s (60/50Hz)
The first number is identifying the reporting rate in a 60Hz system, and
the second number is the reporting rate in a 50Hz system. For example,
if the selected setting is 15/10 fr/s (60/50Hz), this means that the
synchrophasor data reporting rate would be 15 frames per second if the
system frequency is 60Hz. Likewise, if the system frequency is 50Hz,
the selected rate is equal to 10 frames per second.
• RptTimetag: It refers to the method of time-tagging used in the IED
which is related to the phasor estimation and filtering technique. The
options are FirstSample, MiddleSample and LastSample. The time-stamp
of the PMU output represents the phasor equivalent, frequency, and
ROCOF of the power system signal at the time it is applied to the PMU
input. All of these estimates must be compensated for PMU processing
delays including analog input filtering, sampling, and estimation group
delay. If the sample time tags are compensated for all input delays, the
time tag of the sample in the middle of the estimation window can be
used for the phasor estimation (output) time tag as long as the filtering
coefficients are symmetrical across the filtering window.
Note: It is recommended to set this parameter on MiddleSample.
2. PHASORREPORT is the function block responsible for reporting the
synchrophasors. Each instance of PMUREPORT function block has 32 phasor
channels with the following setting parameters; where X is a number from 1 to
32:
Wide area measurement system
Section 6
121