CHAPTER 5: SETTINGS GROUPED ELEMENTSG30 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL 5-2375The element responds to the positive sequence impedance as shown in the logic diagram.Figure 5-129: Loss of excitation logic5.7.12 Accidental energization (ANSI 50/27)SETTINGS GROUPED ELEMENTS SETTING GROUP 1(6) ACCIDENTAL ENERGIZATIONIf the VTs are located on the HV side of the transformer, then the source should be configured using CTs that arealso on the HV side. Correspondingly, if the VTs are located on the LV side of the transformer, then the source shouldbe configured using CTs that are also on the LV side. In both cases, the CT polarity should produce a positive powermeasurement when the machine is generating. ACCIDENTAL ENERGIZATION ACCDNT ENRGFUNCTION: DisabledRange: Disabled, Enabled ACCDNT ENRG SOURCE:SRC 1Range: SRC 1, SRC 2, SRC 3, SRC 4 ACCDNT ENRG ARMINGMODE: UV and OfflineRange: UV and Offline, UV or Offline ACCDNT ENRG OCPICKUP: 0.300 puRange: 0.020 to 3.000 pu in steps of 0.001 ACCDNT ENRG UVPICKUP: 0.500 puRange: 0.004 to 3.000 pu in steps of 0.001 ACCDNT ENRG OFFLINE:OffRange: FlexLogic operand ACCDNT ENRG BLOCK:OffRange: FlexLogic operand ACCDNT ENRG TARGET:Self-resetRange: Self-reset, Latched, Disabled ACCDNT ENRG EVENTS:DisabledRange: Disabled, Enabled
