ABB Relion 650 Series Technical Manual page 216

Section 6
Current protection
Function
Phase current pickup for blocking of
contact function
Reset ratio
Timers
Operate time for current detection
Reset time for current detection
6.12 Stub protection STBPTOC (50STB)
6.12.1 Identification
Function description
Stub protection
6.12.2 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.
6.12.3 Function block
STBPTOC (50STB)
I3P*
BLOCK
ENABLE
ANSI08000051 V1 EN-US
Figure 110: STBPTOC (50STB) function block
210
TRIP
PICKUP
ANSI08000051-1-en.vsd
© Copyright 2011 ABB Power Grids. All rights reserved
Range or value
lBase
(5-200)% of
> 95%
(0.000-60.000) s
35 ms typically
10 ms maximum
IEC 61850 IEC 60617
identification identification
STBPTOC
3I>STUB
SYMBOL-T V1 EN-US
1MRK 506 326-UUS B
Accuracy
± 1.0% of I at I £ I
n n
± 1.0% of I at I > I
n
-
± 0.5% ±10 ms
-
-
ANSI/IEEE C37.2
device number
50STB
Line distance protection REL650
Technical manual
IP14515-1 v3
M17108-1 v2
M12902-3 v7
M12524-3 v5