Loss Of Phase, Undercurrent Phptuc (Ansi 37) - ABB RELION REX640 Technical Manual

Protection functions
4.1.9

Loss of phase, undercurrent PHPTUC (ANSI 37)

4.1.9.1 Identification
Function description
Loss of phase, undercurrent
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
I3P
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.
406
See the preprocessing function blocks in this document for the possible
signal sources.
IEC 61850 IEC 60617
identification identification
PHPTUC1 3I<
Description
Three-phase currents
1MRS759142 F
ANSI/IEEE C37.2
device number
37
REX640
Technical Manual