Section 4 1MAC309294-MB F
Protection functions
202 RER620
Technical Manual
Example
Figure 92: Behavior of different IDMT reset modes. The value for
Type of reset
curve
is “Def time reset”. Also other reset modes are presented for the
time integrator.
The Time multiplier setting is used for scaling the IDMT trip times.
The Minimum Trip time setting parameter defines the minimum desired trip time for
IDMT. The setting is applicable only when the IDMT curves are used.
The timer calculates the pickup duration value PICKUP_DUR which indicates the
percentage ratio of the pickup situation and the set trip time. The value is available through
the Monitored data view.
The Minimum operate time setting should be used with care because the
operation time is according to the IDMT curve, but always at least the value
of the Minimum operate time setting. For more information, see the
General function block features section in this manual.
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