Stub Protection Stbptoc (50Stb) - ABB REL650 Applications Manual

1MRK 506 334-UUS A
7.12
7.12.1
7.12.2
Application manual
Protection
operate time
Normal t
Retrip delay t1
The fault
occurs
Trip and Pickup
CSPRBRF
ANSI10000280 V1 EN
Figure 116: Time Sequence

Stub protection STBPTOC (50STB)

Identification
Function description
Stub protection
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.
cbopen
t after re-trip
cbopen
t
BFPreset
Minimum back-up trip delay t2
Critical fault clearance time for stability
IEC 61850
identification
STBPTOC
Section 7
Current protection
Margin
ANSI10000280-1-en.vsd
IEC 60617 ANSI/IEEE C37.2
identification device number
50STB
3I>STUB
SYMBOL-T V1 EN
Time
237