Operate Delay - DEMA 400 Series User Manual

4.3.2.5.5

Operate Delay

The operation delay is the value that determines the characteristic of the protection curve with
the delay type. Operation delay can take a value between (0.02-200)s if the delay type is
selected as DMT. If the delay type is selected as one of the IDMT curves, the delay is
expressed by the term "TMS" and It can be adjusted between (0.025 – 5).
The TMS value is calculated based on several arguments such as features of the protected
facility and protection selectivity requirements.
TMS Hata! Yer işareti tanımlanmamış.
4.3.2.5.6
The TMS value is the value that determines the characteristic of the protection curve together
with the delay type. TMS setting; The delay type is activated when one of the curves except
DMT is selected. TMS is calculated based on several arguments such as features of the
protected facility, protection selectivity requirements.TMS value can be selected between
(0,025-5)s
4.3.2.5.7 Reset Type
Reset type and time indicates that, the protection function which starts counting with a current
above the specified current threshold, shows the curve and value that determines the
deactivation time if the current falls below the threshold without tripping.
The reset type can be selected as DMT (constant time) and IDMT (reverse constant time)
according to the selected protection curve type. The reset types used by various protection
curves and their parameters are examined in Main Menu> Protection Settings> Protection and
Reset Curves.
4.3.2.5.8 Reset Delay
According to the menu settings, It was selected to count the DMT (constant time) reset time
(0.04 s) after the current has dropped below 5.00 In without exceeding 5.00 In and without
breaker tripping. Thus, after the current falls below the threshold, 40 ms will be counted. If
the threshold is not exceeded until the end of this period, the protection function trip time
counter will be reseted. Reset delay thresholds are in the range of (0-60).
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