•
t = Operating time
•
I
2meas
= Calculated negative sequence
•
k = Constant k value (user settable delay multiplier)
•
I
set
= Pick-up setting of the function
Figure. 5.4.6 - 43. Operation characteristics curve for I2> Curve2.
For a more detailed description on the time characteristics and their setting parameters, please refer to
the "General properties of a protection function" chapter and its "Operating time characteristics for trip
and reset" section.
The user can reset characteristics through the application. The default setting is a 60 ms delay; the
time calculation is held during the release time.
In the release delay option the operating time counter calculates the operating time during the release.
When using this option the function does not trip if the input signal is not re-activated while the release
time count is on-going.
Events and registers
The current unbalance function (abbreviated "CUB" in event block names) generates events and
registers from the status changes in START, TRIP, and BLOCKED. The user can select the status ON or
OFF for messages in the main event buffer. The function offers four (4) independent stages; the events
are segregated for each stage operation.
The triggering event of the function (START, TRIP or BLOCKED) is recorded with a time stamp and with
process data values.
A
AQ
Q-M257
-M257
Instruction manual
Version: 2.07
100
© Arcteq Relays Ltd
IM00021
Summary of Contents for AQ-M257
Page 1: ...AQ M257 Motor protection IED Instruction manual...
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