Extended Maximum Time per Curve
Extended Maximum Time per Curve changes the way the Maximum Time setting can be used.
Instead of the global Maximum Time setting, it allows a Maximum Time setting to be applied to the Trip1 settings for each element that uses an inverse curve for its fault detect timing.
Operation
Normally there is only one Maximum Time setting for each detection group. It is a global setting which means that it applies to the fault detect timing for all elements that use an inverse curve for timing.
When the Extended Maximum
Time per curve feature is on, there is a separate Maximum Time setting
for each inverse curve that has been applied (Maximum 4) This feature
also reduces the minimum value for Maximum Time settings from
2.0 s to 0.2 s. The maximum setting remains at 180.0 s.
The figure below shows the Global Settings and Trip 1 pages with Extended Maximum Time per Curve Off. In this configuration, Maximum Time is a global setting. One setting per group appears on the Global Settings page.
Figure 185
Extended Maximum Time per Curve
OFF
In the next figure with Extended Maximum Time per Curve On, the Maximum Time setting no longer appears on the Global Settings page. Instead, a separate Maximum Time setting is included in the settings for the Phase and Earth fault detect elements which are both configured to use an inverse curve.
Figure 186
Extended Maximum Time per Curve
ON