ABB Relion 670 Series Applications Manual page 412

Section 14
Monitoring
14.12.2 Identification
Function description
Fault current and voltage
monitoring function
14.12.3 Application
Fault current and voltage monitoring function (FLTMMXU) is used for monitoring the fault data on
occurrence of a fault event. The monitored data available can be used for post fault analysis, for
example, switchgear stress for maximum current, doing the root cause analysis of fault event and short
circuit analysis of a power system network.
Analyzing the faults on the power lines and transformer substations based on the available monitored
data can help in managing the power system for improved performance. When a fault occurs, the binary
input TRIGFLTUI of the function can be activated to trigger fault data monitoring, from the trip signal from
the SMPPTRC function for example.
The following values are monitored in the function on occurrence of a trip event.
• Maximum peak current of individual phases during trip event (ILxMAXPK, where Lx =phase L1, L2
and L3)
• Maximum RMS current of individual phases during trip event (ILxMAX)
• Maximum RMS current of all phases during trip event (IMAX)
• Fundamental DFT current magnitude and angle of individual phases at the instant of triggering
(FLTILxMAG/FLTILxANG)
• Fundamental DFT neutral current magnitude and angle at the instant of triggering (FLTINMAG/
FLTINANG)
• Fundamental DFT voltage magnitude and angle of individual phases at the instant of triggering
(FLTULxMAG/FLTULxANG)
• Fundamental DFT neutral voltage magnitude and angle at the instant of triggering (FLTINMAG/
FLTINANG)
Figure 205
406
IEC 61850 identification
FLTMMXU
shows the maximum peak and RMS current calculation during a trip event.
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IEC 60617 identification
-
1MRK 505 370-UUS Rev. K
GUID-A5B9E605-328B-4168-BEE3-7BF30BC7E701 v1
ANSI/IEEE C37.2 device
number
-
GUID-2638C099-B885-4168-B4AC-CC837BCBF96E v1
Busbar protection REB670
Application manual