ABB Relion REC615 - Voltage Total Harmonic Distortion VMHAI; Identification; Function Block; Functionality

Name Type Values (Range) Unit Description
3SMHTDD_C FLOAT32 0.00...500.00 % 3 second mean
value of TDD for
phase C
DMD_TDD_C FLOAT32 0.00...500.00 % Demand value
for TDD for
phase C
10.2 Voltage total harmonic distortion VMHAI
10.2.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE
C37.2 device
number
Voltage total harmonic distortion VMHAI PQM3U PQM3V
10.2.2 Function block
Figure 357: Function block
10.2.3 Functionality
The voltage total harmonic distortion function VMHAI is used for monitoring the
voltage total harmonic distortion THD.
10.2.4 Operation principle
The function can be enabled and disabled with the
Operation setting. The
corresponding parameter values are "On" and "Off".
The operation of VMHAI can be described with a module diagram. All the modules in
the diagram are explained in the next sections.
Power quality measurement functions
1MRS758755 C
704 REC615 & RER615
Technical Manual