MENTOR 12 USER’S MANUAL
SECTION 3: ADVANCED CONTROL – Page 77
the same as the value that exists between increases, that is, the value
corresponding to the pre-fault state, which is entered in its relative window. It
may be greater or less than the value entered in the initial value window.
•
Enter the desired time value in milliseconds in the window that defines the
duration of the initial state (below the green line). It is recommended to select
a minimum value of 1 second (1000 ms) to permit the correct polarisation of
the relay. This duration is only applied to the state prior to the start of the
Binary Search, not to the intervals between increases that are selected
independently.
•
Enter the desired value in the window that defines the end of the Binary
Search. If no trip is detected, the Binary Search will stop at this value.
•
Enter the desired time value in milliseconds in the window that defines the
duration of each increase. This time must at least be that expected for the
tripping of the relay element being tested.
•
Enter the desired time value in milliseconds in the window that defines the
duration of each pre-fault between increases. This time must at least be that
necessary to return the relay to its standby state. This is especially important
when they are remote relays that need a minimum pre-fault time with normal
voltages to be properly polarised and to calculate the faults correctly.
•
Enter the desired value in the window that defines the Precision or
Resolution.
•
With the Binary Search function, like all the advanced control functions, it is
possible to enter a delay in the deactivation of the power outputs in
connection with the detection of the defined trip event, in order to simulate the
switch time, for example. To define this time, enter the desired value in
milliseconds in the relative window.
