CYG PRS-7367 - Switch onto fault SOTF

Protection Functions
PRS-7367 59
No.
Name
Values(Range
)
Unit
Step
Default
Description
0: Open 67Gi VCE and Dir function, the
Protection become 51Gi.
1: Block 67Gi, then the 51GVTi should
be enabled
19
67Gi_CTS_Blk
0-1
-
1
0
The Stage i Protection CTS Alm Block
enable/disable
20
67Gi_PolU
0-1
-
1
0
The Stage i Protection Negative Current
Direction Element enable/disable:
0: zero sequence current direction;
1: Negative Current Direction Element
3.6 Switch onto fault SOTF
3.6.1 SOTF Overview
This relay provides one stage of switch onto fault function with a definite time characteristic. It can
be enabled or disabled independently by the logic settings respectively.
In some feeder applications, three-pole fast tripping may be required if a fault is present on the
feeder when it is energized. Such faults may be due to a fault condition not having been removed
from the feeder, or due to earthing clamps having been left on the following maintenance. In either
case, it may be desirable to clear the fault condition in an accelerated time, rather than waiting for
the time delay associated with overcurrent protection.
Switch onto fault overcurrent protection is equipped in this equipment. Acceleration after tripping
includes accelerated tripping for manual switching-onto-fault or automatic reclosing-onto-fault.
Current settings and delays of the accelerated tripping protection can be configured
independently.
3.6.1.1 Function Block
The function block of the protection is as below.