The measured quantities provided by the function blocks are updated
every 500 ms.
6.1.6.3 Power quality measurement functions (harmonics)
Current total demand distortion monitoring CMHAI
Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Current total demand distortion
monitoring
CMHAI PQM3I PQM3I
Function block
CMHAI
I_A HiATdd
I_B
I_C
BLOCK
GUID-283D7806-89F7-44EB-B976-C7BC5A631525 V1 EN
Figure 48: Function block
Functionality
The distortion monitoring function CMHAI is used for monitoring the current total
demand distortion (TDD). The function can be enabled and disabled with the
Operation setting. The corresponding parameter values are "On" and "Off". The
operation of the current distortion monitoring function can be described with a module
diagram. All the modules in the diagram are explained in the next sections.
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.
Distortion
measure-
ment
Demand
calculation
BLOCK
HiATdd
I_A
I_B
I_C
GUID-78C803DC-EB92-49C1-B3F9-8EFFCC97A7B3 V1 EN
Figure 49: Functional module diagram
1MRS757488 H Section 6
Commissioning
RIO600 85
Installation and Commissioning Manual
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