Setting Guidelines - ABB RELION RET670 Applications Manual

Section 9
Current protection
9.10.3
576
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.
ANSI05000465 V2 EN-US
Figure 283: Typical connection for STBPTOC (50STB) in breaker-and-a-half
arrangement.

Setting guidelines

The parameters for Stub protection STBPTOC (50STB) are set via the local HMI or
PCM600.
The following settings can be done for the stub protection.
GlobalBaseSel: Selects the global base value group used by the function to define
IBase, VBase and SBase as applicable.
Operation: Disabled/Enabled
EnableMode: This parameter can be set Enable or Continuous. With theEnable setting
the function is only active when a binary release signal ENABLE into the function is
activated. This signal is normally taken from an auxiliary contact (normally closed) of
the line disconnector and connected to a binary input ENABLE of the IED. With the
1MRK 504 163-UUS A
Transformer protection RET670 2.2 ANSI
Application manual
M12909-3 v5