Arcteq Generator Commander, Instruction Manual

Page: 231 / 561

The non-directional overcurrent function uses a total of eight (8) separate setting groups which can be
selected from one common source.
The operational logic consists of the following:
• input magnitude processing
• threshold comparator
• block signal check
• time delay characteristics
• output processing.
The inputs for the function are the following:
• setting parameters
• digital inputs and logic signals
• measured and pre-processed voltage 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 figure presents a simplified function block diagram of the volts-per-hertz overexcitation
function.
Figure. 5.4.22 - 118. Simplified function block diagram of the V/Hz> function.
Measured input
The function block uses analog system voltages and system frequency measurement values.
Table. 5.4.22 - 196. Measurement inputs of the volts-per-hertz function.
Signal Description Time base
U
L1
RMS U
L1
System voltage RMS
5ms
U
L2
RMS U
L2
System voltage RMS 5ms
Genera Generattor Commander or Commander
Instruction manual
Version: 2.07
© Arcteq Relays Ltd
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