Stub Protection Stbptoc; Identification; Functionality; Function Block - ABB REC650 Technical Manual

Section 6
Current protection
6.8
6.8.1
6.8.2
6.8.3
134
Function Range or value
Timers (0.000-60.000) s
Operate time for 20 ms typically
current detection
Reset time for current 10 ms maximum
detection

Stub protection STBPTOC

Identification

Function description
Stub protection

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.

Function block

STBPTOC
I3P* TRIP
BLOCK START
RELEASE
IEC08000051 V1 EN
Figure 57: STBPTOC function block
Accuracy
± 0.5% ±10 ms
-
-
IEC 61850 IEC 60617
identification identification
STBPTOC
3I>STUB
SYMBOL-T V1 EN
1MRK 511 287-UEN A
ANSI/IEEE C37.2
device number
50STB
Technical manual