ABB ret650, Applications Manual

Page: 278 / 392

All phase angles are presented in relation to defined reference channel. The
parameter
PhaseAngleRef defines the reference, see Section “Analog inputs” .
Calibration curves
It is possible to calibrate the functions (, CMMXU, VMMXU and VNMMXU) to
get class 0.5 presentations of currents, voltages and powers. This is accomplished
by amplitude and angle compensation at 5, 30 and 100% of rated current and
voltage. The compensation curve will have the characteristic for amplitude and
angle compensation of currents as shown in figure
96 (example). The first phase
will be used as reference channel and compared with the curve for calculation of
factors. The factors will then be used for all related channels.
IEC05000652 V2 EN-US
Figure 96: Calibration curves
13.1.4.1 Setting examples
SEMOD54481-4 v5
Three setting examples, in connection to Measurement function (), are provided:
• Measurement function () application for a OHL
• Measurement function () application on the secondary side of a transformer
• Measurement function () application for a generator
For each of them detail explanation and final list of selected setting parameters
values will be provided.
Section 13
1MRK 504 169-UEN A
Monitoring
272 Transformer protection RET650 2.2 IEC
Application manual