Function
Range or value
Accuracy
Reset ratio
> 95%
-
Timers
(0.000-60.000) s
±
0.5%
±
10 ms
Operate time for current
detection
20 ms typically
-
Reset time for current
detection
10 ms maximum
-
6.8
Stub protection STBPTOC (50STB)
6.8.1
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Stub protection
STBPTOC
3I>STUB
SYMBOL-T V1 EN
50STB
6.8.2
Functionality
When a power line is taken out of service for maintenance and the line disconnector is
opened, line side voltage transformers will be on the disconnected part of the line. The
primary line distance protection will thus not be able to operate and must be blocked.
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.
6.8.3
Function block
ANSI08000051-1-en.vsd
STBPTOC (50STB)
I3P*
BLOCK
ENABLE
TRIP
PICKUP
ANSI08000051 V1 EN
Figure 57:
STBPTOC (50STB) function block
Section 6
1MRK 511 287-UUS A
Current protection
142
Technical manual
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