ABB RET620 - Residual Voltage Measurement (RESVMMXU); Three-Phase Power and Energy (PEMMXU); Frequency Measurement (FMMXU)

Table 79. Residual voltage measurement (RESVMMXU)
Characteristic Value
Operation accuracy Depending on the frequency of the current measured: f/f
n
= ±2 Hz
±0.5% or ±0.002 x U
n
Suppression of harmonics DFT: -50 dB at f = n x f
n
, where n = 2, 3, 4, 5,…
RMS: No suppression
Table 80. Three-phase power and energy (PEMMXU)
Characteristic Value
Operation accuracy At all three currents in range 0.10…1.20 x I
n
At all three voltages in range 0.50…1.15 x U
n
At the frequency f
n
±1 Hz
Active power and energy in range |PF| > 0.71
Reactive power and energy in range |PF| < 0.71
±1.5% for power (S, P and Q)
±0.015 for power factor
±1.5% for energy
Suppression of harmonics DFT: -50 dB at f = n x f
n
, where n = 2, 3, 4, 5,…
Table 81. Frequency measurement (FMMXU)
Characteristic
Value
Operation accuracy ±10 mHz
(in measurement range 35 - 75 Hz)
Transformer Protection and Control 1MRS757846 A
RET620
Product version: 2.0
46 ABB