Current Total Demand Distortion Cmhai - ABB RELION Series Technical Manual

1MRS758755 A
Section 10
10.1
10.1.1
10.1.2
10.1.3
10.1.4
REC615 and RER615
Technical Manual
Power quality measurement functions

Current total demand distortion CMHAI

Identification
Function description
Current total demand distortion
Function block
GUID-62495CAB-20DF-4BBA-9D5C-ECDE1D2AAB52 V1 EN
Figure 356: Function block
Functionality
The current total demand distortion function CMHAI is used for monitoring the
current total demand distortion TDD.
Operation principle
The function can be enabled and disabled with the Operation setting. The
corresponding parameter values are "On" and "Off".
The operation of CMHAI can be described with a module diagram. All the modules
in the diagram are explained in the next sections.
I_A
Distortion
I_B measure-
ment
I_C
BLOCK
GUID-E5EC5FFE-7679-445B-B327-A8B1759D90C4 V1 EN
Figure 357: Functional module diagram
Power quality measurement functions
IEC 61850 IEC 60617
identification identification
CMHAI PQM3I
Demand
ALARM
calculation
Section 10
ANSI/IEEE C37.2
device number
PQM3I
673