GE RPV311, Technical Manual

Page: 123 / 295

RPV311 Chapter 5
– Operation
RPV311-TM-EN-7 123
S
+
Positive sequence ¹ ²
S
−
Negative sequence ¹ ²
U
Imbalance ¹ ²
F
Fundamental frequency ²
THD
Total harmonic distortion ²
¹ Is not calculated for circuits of 1 element without 3-phase synthesis.
² Is not calculated for neutral circuits.
The fundamental frequency of the input signal must be within a range of ± 6 Hz of
the nominal frequency of the electrical system.

Power Measurement:
Power measurement is computed based on the values of a voltage circuit and a
current circuit. The following values are computed once per cycle:
Voltage and current measurement
S
Combined apparent power
S
1
Fundamental apparent power
P
1
Phasors ¹
Q
1
Phasors (neutral) ¹
Reactive power has a positive sign for circuits with inductive characteristics and a
negative sign for circuits with capacitive characteristics.

DC Transducers Measurement:
The RMS value of the DC channels (transducers) is calculated once per cycle.

High-speed Voltage Measurement:
There is an 8-bit opto-isolated analog-to-digital converter, independent for each
channel. The acquisition is performed with 5 MHz sampling frequency (high-speed
channels), that means one acquisition each 200 ns.