Application Guide - NP900 Series
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A996A
Figure 3.2.1.3-24 Definite (Min) Operating Time Delay determines the minimum operating
time delay. When using only IDMT it is possible to disable minimum operating time delay
by setting this parameter to zero.
In the table below are presented the setting parameters for the function time
characteristics.
Table 3.2.1.3-42 Operating time characteristics setting parameters (general).
Name
Range
Step
Default
Description
Delay Type
DT
IDMT
-
DT
Selection of the delay type time counter.
Selection possibilities are dependent
(IDMT, Inverse Definite Minimum Time)
and independent (DT, Definite Time)
characteristics.
Definite (Min)
operating time
delay
0.000…1800.000 s 0.005 s
0.040 s
When Delay Type is set to DT this
parameter acts as the expected operating
time for the protection function.
When set to 0.000 s the stage operates as
instant (PIOC, 50) stage without added
delay. When the parameter is set to 0.005
– 1800 s the stage operates as
independent delayed (PTOC, 51).
When Delay Type has been set to IDMT
this parameter can be used to determine
the minimum operating time for the
protection function. Example of this is
presented in figure above.
