GE P24DM Technical Manual

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If the line is closed where a three-phase VT failure is present, the overcurrent detector will not operate and a VTSblock will be applied. Closing onto a three-phase fault will result in operation of the overcurrent detector andprevent a VTS block being applied.3.4 VTS IMPLEMENTATIONVTS is implemented in the SUPERVISION column of the relevant settings group.The following settings are relevant for VT Supervision:● VTS Status: determines whether the VTS Operate output will be a blocking output or an alarm indicationonly● VTS PickupThresh: determines the threshold at which the phase voltage detectors pick up● VTS Reset Mode: determines whether the Reset is to be manual or automatic● VTS Time delay: determines the operating time delay● VTS I> Inhibit: inhibits VTS operation in the case of a phase overcurrent fault● VTS I2> Inhibit: inhibits VTS operation in the case of a negative sequence overcurrent faultVTS is only enabled during a live line condition (as indicated by the pole dead logic) to prevent operation underdead system conditions.3.5 VTS LOGICThis logic will only be enabled during a live line condition (as indicated by the pole dead logic) to prevent operationunder dead system conditions (i.e. where no voltage will be present and the VTS I> Inhibit overcurrent element willnot be picked up).P24xM Chapter 14 - SupervisionP24xM-TM-EN-2.1 277