Section 8
1MAC050144-MB C
Measurement functions
572
615 series ANSI
Technical Manual
8.11
Voltage total harmonic distortion, PQVPH
8.11.1
Identification
8.11.2
Function Block
Figure 306:
Function block
8.11.3
Functionality
The Voltage total harmonic distortion function PQVPH is used for monitoring the voltage
total harmonic distortion THD.
8.11.4
Operation principle
The function can be enabled and disabled with the
Operation setting
. The corresponding
parameter values are Enable and Disable.
The operation of the voltage distortion monitoring function can be described with a
module diagram. All the modules in the diagram are explained in the next sections.
Figure 307:
Functional module diagram
The distortion measurement module measures harmonics up to the 11
th
harmonic. The
total harmonic distortion THD for voltage is calculated from the measured harmonic
components with the formula
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Voltage total harmonic
distortion
VMHAI
PQM3U
PQVPH
Distortion
measure-
ment
Demand
calculation
BLOCK
ALARM
V_A_AB
V_B_BC
V_C_CA
Summary of Contents for 615 Series ANSI
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