ABB REF615 L User Manual

Section 10 Power quality measurement functions
10.1 Current total demand distortion monitoring CMHAI
10.1.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Current total demand distortion
monitoring
CMHAI PQM3I PQM3I
10.1.2 Function block
GUID-62495CAB-20DF-4BBA-9D5C-ECDE1D2AAB52 V1 EN
Figure 408: Function block
10.1.3 Functionality
The distortion monitoring 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 the current distortion monitoring function can be described with a
module diagram. All the modules in the diagram are explained in the next sections.
1YHT530004D05 D Section 10
Power quality measurement functions
615 series 765
Technical Manual

ABB REF615 L Specifications

General

Type	Feeder Protection Relay
Rated Frequency	50/60 Hz
Weight	Approx. 1.5 kg
Communication Protocols	IEC 61850, Modbus RTU, DNP3
Protection Functions	Overcurrent, Earth fault, Thermal overload, Under/Over voltage, Under/Over frequency
Enclosure	IP20