1MAC309294-MB F Section 10
General function block features
RER620 463
Technical Manual
10.2 Current based inverse definite minimum time
characteristics
10.2.1 IDMT curves for overcurrent protection
In inverse-time modes, the trip time depends on the momentary value of the current: the
higher the current, the faster the trip time. The trip time calculation or integration starts
immediately when the current exceeds the set Pickup value and the PICKUP output is
activated.
The TRIP output of the component is activated when the cumulative sum of the integrator
calculating the overcurrent situation exceeds the value set by the inverse-time mode. The
set value depends on the selected curve type and the setting values used. The user
determines the curve scaling with the Time multiplier setting.
The Minimum trip time setting defines the minimum trip time for the IDMT mode, that is,
it is possible to limit the IDMT based trip time for not becoming too short. For example:
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