Application Guide - NP900 Series
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A996A
Blocking signal can be tested also in the commissioning phase of the stage by software
switch signal when relay common and global testing mode is activated.
User settable variables are binary signals from the system. Blocking signal needs to reach
the IED minimum of 5 ms before the set operating delay has passed for blocking to be
active in time.
3.7.1.4
O
PERATING TIME CHARACTERISTICS FOR TRIP AND RESET
This function supports definite time delay (DT). For detailed information on this delay type
refer to chapter General properties of a protection function.
3.7.1.5
T
YPICAL
CTS
CASES
In following figures are presented few typical cases of CTS situations and setting effects.
Figure 3.7.1.5-220 System in case when all is working properly and no fault is present.
