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The outputs of the function are the START, TRIP and BLOCKED signals. The undervoltage 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
• two 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 outputs the 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 signals. 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 undervoltage function.
Figure. 5.3.11 - 122. Simplified function block diagram of the U< function.
Measured input
The function block uses analog voltage measurement values. The monitored magnitudes are equal
to RMS values. A -20 ms averaged value of the selected magnitude is used for pre-fault data
registering.
A
AQ
Q-F213
-F213
Instruction manual
Version: 2.04
169
Содержание AQ-F213
Страница 1: ...AQ F213 Feeder protection IED Instruction manual ...
Страница 399: ...Figure 7 4 239 Example block scheme A AQ Q F213 F213 Instruction manual Version 2 04 398 ...
Страница 421: ...Figure 8 14 262 Panel cutout dimensions and device spacing A AQ Q F213 F213 Instruction manual Version 2 04 420 ...