High-Impedance/Flux-Balance Based Differential Protection For Motors Mhzpdif - ABB RELION 620 Series Technical Manual

1MRS757644 H
4.3.6 High-impedance/flux-balance based differential
protection for motors MHZPDIF
4.3.6.1 Identification
Function description
High-impedance/flux-balance based
differential protection for motors
4.3.6.2 Function block
Figure 312: Function block
4.3.6.3 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.
4.3.6.4 Operation principle
The function can be enabled and disabled with the
corresponding parameter values are "On" and "Off".
The operation of MHZPDIF can be described using a module diagram. All the
modules in the diagram are explained in the next sections.
Figure 313: Functional module diagram
620 series
Technical Manual
IEC 61850 IEC 60617
identification identification
MHZPDIF 3dIHi>M
Operation setting . The
Protection functions
ANSI/IEEE C37.2
device number
87MH
597