12.24
SEL-421 Relay Instruction Manual Date Code 20171021
Analog Quantities
Protection Frequency
DFDTP Rate-of-change of frequency Hertz/seconds [Hz/s]
FREQ Tracking frequency Hertz [Hz]
FREQP Frequency for under-/overfrequency elements Hertz [Hz]
Remote Analogs
RA001–RA256 Remote analogs N/A
RAO01–RAO64 Remote analog output N/A
Out-Of-Step
SCV Unfiltered swing center voltage Per unit (pu)
Relay Temperature
RLYTEMP Relay temperature (temperature of the enclosure) °C (degrees Celsius)
Table 12.2 Analog Quantities Sorted by Function (Sheet 13 of 13)
Labels Description Unit
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