the incidence of a fault, as a consequence of incorrect switching and when CT saturation takesplace. Since the currents during power swings are sinusoidal and do not contain a DCcomponent, it is permissible to assume that the problem of CT saturation does not arise.Zero-crossings resulting from the slip are in any event excluded by the current enable settingof Imin.5.2 Definite time over- and undercurrent protection 51(OCDT)5.2.1 Mode of operation GUID-01B16DD6-3FA9-4079-9390-9204C842DAD9 v1Over- and undercurrent function for:• phase fault protection• backup protection• or for monitoring a current minimum5.2.2 Features GUID-0F07ECF4-7210-44FF-A17D-97F403D140FB v1• Insensitive to DC component• Insensitive to harmonics• Single or three-phase measurement• Maximum respectively minimum value detection in the three-phase mode• Detection of inrush currents5.2.3 Inputs and outputs5.2.3.1 CT/VT inputs GUID-F644DFAA-0B84-4353-9F19-FE8FD67FE590 v1• Current5.2.3.2 Binary inputs GUID-AB3D1639-2EDC-4AE9-BE1B-DD3EA05AA4F9 v1• Blocking5.2.3.3 Binary outputs GUID-C0E2CC33-55E1-4C4F-84A0-CD307A90DA0A v1• Pick-up• Tripping5.2.3.4 Measurements GUID-AFB5BC3C-9DB7-450E-9C49-4CB7196297F7 v1• Current amplitude1MRK 505 406-UEN B Section 5Bay protection functionsBay protection functions REB500 91Technical manual© Copyright 2019 ABB. All rights reserved
