1MAC050144-MB C
Section 11
General function block features
615 series ANSI
663
Technical Manual
11.3
Voltage based inverse definite minimum time
characteristics
11.3.1
IDMT curves for overvoltage protection
In inverse-time modes, the trip time depends on the momentary value of the voltage, the
higher the voltage, the faster the trip time. The trip time calculation or integration starts
immediately when the voltage exceeds the set value of the
Pickup value
setting and the
PICKUP
output is activated.
The
TRIP
output of the component is activated when the cumulative sum of the integrator
calculating the overvoltage 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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