ABB REC650 - Stub Protection STBPTOC (50 STB)

Time
The fault
occurs
Protection
operate time
Trip and Pickup
CCRBRF
(50BF)
Normal t
cbopen
Margin
Retrip delay t1 t
cbopen
after re-trip
t
BFPreset
Minimum back-up trip delay t2
Critical fault clearance time for stability
ANSI05000479_3_en.vsd
ANSI05000479 V3 EN
Figure 57: Time sequence
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 Application
Stub protection STBPTOC (50STB) is a simple phase overcurrent protection, fed from the
two current transformer groups feeding the object taken out of service. The stub protection
is only activated when the disconnector of the object is open. STBPTOC (50STB) enables
fast fault clearance of faults at the section between the CTs and the open disconnector.
Section 6 1MRK 511 286-UUS A
Current protection
134
Application manual