ABB RELION 620 Series Technical Manual page 679

1MAC504801-IB E
8.2
8.2.1
8.2.2
8.2.3
8.2.4
620 series ANSI
Technical Manual
Voltage total harmonic distortion PQVPH
Identification
Function description
Voltage total harmonic distortion
Function block
GUID-CF203BDC-8C9A-442C-8D31-1AD55110469C-ANSI V1 EN
Figure 338: Function block
Functionality
The voltage total harmonic distortion function PQVPH is used for monitoring the voltage
total harmonic distortion THD.
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.
V_A_AB
V_B_BC
V_C_CA
BLOCK
GUID-477C2AE6-EE70-4A31-A71B-EE77DBFAFD0E V1 EN
Figure 339: Functional module diagram
Power quality measurement functions
IEC 61850 IEC 60617
identification identification
VMHAI PQM3U
Distortion
Demand
measure-
calculation
ment
Section 8
ANSI/IEEE C37.2
device number
PQVPH
ALARM
673