by opening the disconnector to the protected object. This will, however, disable the normalobject protection (for example the distance protection) of the energized part between thecircuit breakers and the open disconnector.Stub protection STBPTOC is a simple phase overcurrent protection, fed from the two currenttransformer groups feeding the object taken out of service. The stub protection is onlyactivated when the disconnector of the object is open. STBPTOCenables fast fault clearance offaults at the section between the CTs and the open disconnector.IEC05000465 V2 EN-USFigure 48: Typical connection for STBPTOC in 1½-breaker arrangement.6.10.3 Setting guidelines M12909-3 v5The parameters for Stub protection STBPTOC 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),(UBase) and (SBase).Operation:Off/OnReleaseMode: This parameter can be setRelease orContinuous. With theRelease setting thefunction is only active when a binary release signal RELEASE into the function is activated. Thissignal is normally taken from an auxiliary contact (normally closed) of the line disconnectorand connected to a binary input RELEASE of the IED. With the settingContinuous the functionis activated independent of presence of any external release signal.Section 6 1MRK 505 355-UEN ACurrent protection104Application manual
