Tools > IEC IDMT Trip Time Comparison

IEC 60255 IDMT Trip Time Comparison

This tool allows for a single curve to be displayed with the calculated trip time. Alongside the calculated trip time, engineer test results can be compared for phases L1, L2 and L3.

The resulting plot can be saved and used in engineer reports by clicking Download image.

The formula and curve constants used to determine the trip times are shown below:

\begin{equation*} t(I)= TMS \displaystyle \left( \frac {k}{\displaystyle \left(\frac{I}{Is}\right)^\alpha-1}\right) \end{equation*}
Curve type k α
Standard inverse 0.140 0.020
Very inverse 13.5 1
Extremely inverse 80 2
Long time inverse 120 1
Trip times

Calculated trip time: - s




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