The stub protection STBPTOC (50STB) covers the zone between the current transformers and the
open disconnector. The three-phase instantaneous overcurrent function is released from a
normally open, 89b auxiliary contact on the line disconnector.
8.9.3
Function block
M12524-3 v5
ANSI05000678-2-en.vsd
STBPTOC (50STB)
I3P*
BLOCK
BLKTR
ENABLE
TRIP
PICKUP
ANSI05000678 V2 EN-US
Figure 282: STBPTOC (50STB) function block
8.9.4
Signals
PID-3462-INPUTSIGNALS v5
Table 263: STBPTOC (50STB) Input signals
Name
Type
Default
Description
I3P
GROUP
SIGNAL
-
Three phase currents
BLOCK
BOOLEAN
0
Block of function
BLKTR
BOOLEAN
0
Block of trip
ENABLE
BOOLEAN
0
Enable stub protection usually with open disconnect switch (89b)
PID-3462-OUTPUTSIGNALS v5
Table 264: STBPTOC (50STB) Output signals
Name
Type
Description
TRIP
BOOLEAN
General trip
PICKUP
BOOLEAN
Pickup
8.9.5
Settings
PID-3462-SETTINGS v5
Table 265: STBPTOC (50STB) Group settings (basic)
Name
Values (Range)
Unit
Step
Default
Description
Operation
Disabled
Enabled
-
-
Disabled
Operation Disabled/Enabled
EnableMode
Release
Continuous
-
-
Release
Enable stub protection usually with open
disconnect switch (89b)
IPickup
5 - 2500
%IB
1
200
Pickup current level in % of IBase
Section 8
1MRK 502 066-UUS B
Current protection
534
Technical manual
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