GE D90 Plus Instruction Manual page 559

CHAPTER 11: METERING
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
Figure 481: Phasor Measurement Unit recording configuration settings
The following settings are available for each PMU.
Recording Rate
Range: 1, 2, 5, 10, 12, 15, 20, 25, 30, 50, or 60 times per second
Default: 10 times per second
This setting specifies the recording rate for the record content. Not all recording rates
are applicable to either 50 or 60 Hz systems (for example, recording at 25 phasors a
second in a 60 Hz system). The relay supports decimation by integer number of phasors
from the nominal system frequency. If the rate of 25 is selected for the 60 Hz system, the
relay decimates the rate of 60 phasors a second by round (60 / 25) = 2; that is, it records
at 60 / 2 = 30 phasors a second.
Number of Timed Records
Range: 1 to 128 in steps of 1
Default: 3
This setting specifies how many timed records are available for a given logical PMU. The
length of each record equals available memory divided by the content size and number
of records. The higher the number of records, the shorter each record. The relay supports
a maximum of 128 records.
PHASOR MEASUREMENT UNIT
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