Figure. 5.4.12 - 73. Earth fault in isolated network.
Figure. 5.4.12 - 74. Close-distance short-circuit between phases 1 and 3.
The sequence voltage function uses a total of eight (8) separate setting groups which can be selected
from one common source.
The function can operate on instant or time-delayed mode. In time-delayed mode the operation can be
selected between definite time (DT) mode and inverse definite minimum time (IDMT).
The operational logic consists of the following:
• input magnitude selection
• input magnitude processing
• threshold comparator
• block signal check
• time delay characteristics
• output processing.
The inputs for the function are the following:
• operating mode selections
• 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 a resettable cumulative counter for the START, TRIP and
BLOCKED events.
The following figure presents a simplified function block diagram of the sequence voltage function.
Genera
Generattor Commander
or Commander
Instruction manual
Version: 2.07
148
© Arcteq Relays Ltd
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Summary of Contents for Generator Commander
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