4.1.9 Loss of phase, undercurrent PHPTUC (ANSI 37)
4.1.9.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Loss of phase, undercurrent PHPTUC1 3I< 37
4.1.9.2 Function block
Figure 235: Function block
4.1.9.3 Functionality
The phase undercurrent protection function PHPTUC is used to detect an
undercurrent that is considered as a fault condition.
PHPTUC starts when the current is less than the set limit. Operation time
characteristics are according to definite time (DT).
The function contains a blocking functionality. It is possible to block function
outputs and reset the definite timer.
4.1.9.4 Analog input configuration
PHPTUC has one analog group input which must be properly configured.
Table 467: Analog inputs
Input Description
I3P Three-phase currents
See the preprocessing function blocks in this document for the possible
signal sources.
Improper analog channel configuration causes a validation error if the analog
channels are not completely configured or they do not match with certain settings.
For troubleshooting, check the contents of this chapter and also the preprocessing
blocks in this document. The configuration can be written to the protection relay
once the mismatch is corrected.
Protection functions
1MRS759142 F
406 REX640
Technical Manual
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