Switch-Onto-Fault Protection Cvpsof - ABB RELION REX640 Technical Manual

1MRS759142 C
5.8
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REX640
Technical Manual

Switch-onto-fault protection CVPSOF

Identification
Function description
Switch-onto-fault protection
Function block
GUID-F5103FEE-E1EE-4535-9433-E9DCE6BC6974 V1 EN
Figure 609: Function block
Functionality
The switch-onto-fault function CVPSOF is a complementary function, especially to
the distance protection function (DSTPDIS), but it can also be used to complement the
non-directional or directional overcurrent protection functions (PHxPTOC,
DPHxPDOC).
CVPSOF accelerates the operation of the protection ensuring a fast trip when the
breaker is closed onto faulted feeder or bus. Without CVPSOF the measured voltages
may be too small for the impedance zones or the directional overcurrent stages to
operate reliably. This condition exists when the voltage transformers are located in the
feeder or the bus side to be energized and therefore the voltage memory required for
a correct directional measurement is not available.
Analog channel configuration
CVPSOF has two analog group inputs which must be properly configured.
Protection related functions
IEC 61850 IEC 60617
identification identification
CVPSOF CVPSOF
Section 5
ANSI/IEEE C37.2
device number
SOFT
1125