• operating mode selections
• setting parameters
• digital inputs and logic signals
• measured and pre-processed frequency magnitudes.
The function's outputs are START, TRIP and BLOCKED signals which can be used for direct I/O
controlling and user logic programming. The function generates general time-stamped ON/OFF events
to the common event buffer from each of the three (3) output signal. In the instant operating mode the
function outputs START and TRIP events simultaneously with an equivalent time stamp. The time stamp
resolution is 1 ms. The function also provides a resettable cumulative counter for the START, TRIP and
BLOCKED events.
The following figures present simplified function block diagrams of the frequency function.
Figure. 5.4.13 - 77. Simplified function block diagram of the f> function.
Figure. 5.4.13 - 78. Simplified function block diagram of the f< function.
Measured input
The frequency protection function compares the measured frequency to the pick-up setting (given in
Hz). The source of the measured frequency depends on the user-defined tracking reference which can
be chosen from the
Frequency tab of the Measurement menu.
Genera
Generattor Commander
or Commander
Instruction manual
Version: 2.07
© Arcteq Relays Ltd
IM00001
155
Summary of Contents for Generator Commander
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