ABB RELION Series User Manual

Section 10 Power quality measurement functions
10.1 Current total demand distortion CMHAI
10.1.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Current total demand distortion CMHAI PQM3I PQM3I
10.1.2 Function block
GUID-62495CAB-20DF-4BBA-9D5C-ECDE1D2AAB52 V1 EN
Figure 356: Function block
10.1.3 Functionality
The current total demand distortion function CMHAI is used for monitoring the
current total demand distortion TDD.
10.1.4 Operation principle
The function can be enabled and disabled with the Operation setting. The
corresponding parameter values are "On" and "Off".
The operation of CMHAI can be described with a module diagram. All the modules
in the diagram are explained in the next sections.
BLOCK
ALARM
Distortion
measure-
ment
I_A
I_B
I_C
Demand
calculation
GUID-E5EC5FFE-7679-445B-B327-A8B1759D90C4 V1 EN
Figure 357: Functional module diagram
1MRS758755 A Section 10
Power quality measurement functions
REC615 and RER615 673
Technical Manual

ABB RELION Series Specifications

General

Product Series	RELION
Category	Control Unit
Analog Outputs	Up to 8
Product Type	Protection and Control IED
Communication Protocols	IEC 61850, Modbus, DNP3
Input Voltage	24-250 V DC / 110-230 V AC
Protection Functions	Overcurrent, Overvoltage, Undervoltage, Earth fault, Frequency