ABB RELION 620 Series Technical Manual page 637

1MAC504801-IB E
Section 7
7.1
7.1.1
620 series ANSI
Technical Manual
Measurement functions
Basic measurements
Functions
The three-phase current measurement function IA, IB, IC is used for monitoring and
metering the phase currents of the power system.
The three-phase voltage measurement function VA, VB, VC is used for monitoring and
metering the phase-to-phase voltages of the power system. The phase-to-ground voltages
are also available in VA, VB, VC.
The ground current measurement function IG is used for monitoring and metering the
ground current of the power system.
The ground voltage measurement function VG is used for monitoring and metering the
ground voltage of the power system.
The sequence current measurement I1, I2, I0 is used for monitoring and metering the
phase sequence currents.
The sequence voltage measurement V1, V2, V0 is used for monitoring and metering the
phase sequence voltages.
The frequency measurement F is used for monitoring and metering the power system
frequency.
The single-phase power and energy measurement SP, SE and the three-phase power and
energy measurement P, E is used for monitoring and metering the active power P, reactive
power Q, apparent power S, power factor PF and for calculating the accumulated energy
separately as forward active, reverse active, forward reactive and reverse reactive. P, E
calculates these quantities with the fundamental frequency phasors, that is, the DFT
values of the measured phase current and phase voltage signals.
The information of the measured quantity is available for the operator both locally in
LHMI and remotely to a network control center with communication.
Section 7
Measurement functions
631