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I-Protection Module – Overcurrent Protection [ANSI 50, 51, 67] Explanation: t = Tripping delay t-char = Time multiplier/tripping characteristic factor I = Fault current I> = If the pick-up value is exceeded, the module/stage will be started. By using the projecting parameters each of the overcurrent protective elements can be defined as »forward«, »reverse« or »non-directional«. The forward or reverse direction is based on the characteristic angle for the phase direction specified by the field parameter »I MTA«. No directional information will be taken into account if the current protective element is planned as »non-directional« EN MRA4 04/09 Page 261
