ABB REC650 - Stub Protection STBPTOC; Identification; Functionality; Function Block

Function Range or value Accuracy
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
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 the voltage transformers will mostly be outside on the disconnected part.
The primary line distance protection will thus not be able to operate and must be
blocked.
The stub protection STBPTOC covers the zone between the current transformers and
the open disconnector. The three-phase instantaneous overcurrent function is released
from a normally open, NO (b) auxiliary contact on the line disconnector.
6.8.3 Function block
STBPTOC
I3P*
BLOCK
RELEASE
TRIP
START
IEC08000051 V1 EN
Figure 57: STBPTOC function block
Section 6 1MRK 511 287-UEN A
Current protection
134
Technical manual