Hitachi Relion 670 Series Applications Manual page 319
Hide thumbs
Also See for Relion 670 Series:
- Applications manual (354 pages) ,
- Commissioning manual (284 pages) ,
- Product manual (192 pages)
Table of Contents
Advertisement
1MRK506375-UEN Rev. N
CVMMXN provides the following power system quantities:
•
P, Q and S: two or single phase active, reactive and apparent power
•
PF: power factor
•
F: power system frequency
The CVMMXN function calculates two-phase power quantities by using fundamental frequency
phasors (DFT values) of the measured current respectively voltage signals. The measured power
quantities are available either, as instantaneously calculated quantities or, averaged values over a
period of time (low pass filtered) depending on the selected settings.
The measuring functions CMMXU, VMMXU and VNMMXU are located under:
Main menu /Measurement /Monitoring /CurrentPhasors(I) /CMMXU
Main menu /Measurement /Monitoring /VoltagePhasors, phase-phase(U) /VMMXU
Main menu /Measurement /Monitoring /VoltagePhasors, phase-neutral(UN) /VNMMXU
CMMXU, VMMXU and VNMMXU provide physical quantities:
•
I: phase currents (amplitude and angle) (CMMXU)
•
U: voltages (phase-to-earth and phase-to-phase voltage, amplitude and angle) (VMMXU,
VNMMXU)
Fundamental frequency filtered values (DFT) or true RMS values can be selected as a measurement
type in CMMXU, VMMXU and VNMMXU functions.
The measuring functions CMSQI and VMSQI are located under:
Main menu /Measurement /Monitoring /CurrentSequenceComponents(Isqi) /CMSQI
Main menu /Measurement /Monitoring /VoltageSequenceComponents(Usqi) /VMSQI
CMSQI and VMSQI provide sequence component quantities:
•
I: sequence currents (positive and zero sequence, amplitude and angle)
•
U: sequence voltages (positive and zero sequence, amplitude and angle).
It is possible to calibrate the measuring function to get better than class 0.5 presentation. This is
accomplished by angle and amplitude compensation at 5%, 30% and 100% of the rated current and
at 100% of the rated voltage.
15.1.4
Zero clamping
Measuring functions CVMMXN, CMMXU, VMMXU and VNMMXU have no interconnections
regarding any settings or parameters.
Zero clampings are also handled entirely by ZeroDb separately for each function's every output
signal. For example, zero clamping of U12 is handled by UL12ZeroDb in VMMXU, zero clamping of
I1 is handled by IL1ZeroDb in CMMXU, and so on.
Example of CVMMXN operation
Outputs seen on the local HMI under Main menu/Measurements /Monitoring/
Servicevalues(P_Q) /CVMMXN(P_Q):
Railway application RER670
Application manual
© 2017 - 2023 Hitachi Energy. All rights reserved
Section 15
Monitoring
GUID-8DABC3F5-6615-493C-B839-A5C557A2FAE8 v5
313
Advertisement
Table of Contents
