High-Impedance Or Flux-Balance Based Differential Protection Mhzpdif; Identification; Function Block; Functionality - ABB RELION REX640 Technical Manual

1MRS759142 C
4.3.8
4.3.8.1
4.3.8.2
4.3.8.3
4.3.8.4
REX640
Technical Manual
High-impedance or flux-balance based differential protection
MHZPDIF

Identification

Function description
High-impedance or flux-balance based
differential protection

Function block

GUID-58AF7576-A335-45F6-9DD6-A84C17EC4A66 V1 EN
Figure 399: Function block

Functionality

The high-impedance/flux-balance based differential protection for motors function
MHZPDIF provides winding short circuit protection for motors.
MHZPDIF starts and operates when any of the three-phase differential currents,
ID_A, ID_B or ID_C, exceeds the set limit. The operation timer characteristic is
according to the definite time (DT).
This function contains a blocking functionality. It is possible to block the function
outputs, timers or the function itself.

Analog channel configuration

MHZPDIF has one analog group input which must be properly configured.
Table 650: Analog signals
Input
I3P
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
Protection functions
IEC 61850 IEC 60617
identification identification
MHZPDIF 3dIHi>M
Description
Three-phase currents
Section 4
ANSI/IEEE C37.2
device number
87HIM
721