When setting the comparators, the user must first choose a comparator mode. The following modes
are available:
Mode
Description
0: Over
>
G
Grrea
eatter than
er than. If the measured signal is greater than the set pick-up level, the comparison condition is fulfilled.
1: Over
(abs) >
G
Grrea
eatter than (
er than (absol
absolut
utee)). If the absolute value of the measured signal is greater than the set pick-up level, the
comparison condition is fulfilled.
2:
Under <
LLess than
ess than. If the measured signal is less than the set pick-up level, the comparison condition is fulfilled. The user
can also set a blocking limit: the comparison is not active when the measured value is less than the set blocking
limit.
3:
Under
(abs) <
LLess than (
ess than (absol
absolut
utee)). If the absolute value of the measured signal is less than the set pick-up level, the comparison
condition is fulfilled. The user can also set a blocking limit: the comparison is not active when the measured value is
less than the set blocking limit.
4: Delta
set (%)
+/- >
R
Rela
elativ
tive change o
e change ovver time
er time. If the measured signal changes more than the set relative pick-up value in 20 ms, the
comparison condition is fulfilled. The condition is dependent on direction.
5: Delta
abs (%)
>
R
Rela
elativ
tive change o
e change ovver time (
er time (absol
absolut
utee)). If the measured signal changes more than the set relative pick-up value in 20
ms in either direction, the comparison condition is fulfilled. The condition is not dependent on direction.
6: Delta
+/-
measval
C
Change o
hange ovver time
er time. If the measured signal changes more than the set pick-up value in 20 ms, the comparison
condition is fulfilled. The condition is dependent on direction.
7: Delta
abs
measval
C
Change o
hange ovver time (
er time (absol
absolut
utee)). If the measured signal changes more than the set pick-up value in 20 ms in either
direction, the comparison condition is fulfilled. The condition is not dependent on direction.
The pick-up level is set individually for each comparison. When setting up the pick-up level, the user
needs to take into account the modes in use as well as the desired action. The pick-up limit can be
set either as positive or as negative. Each pick-up level has a separate hysteresis setting which is 3 %
by default.
The user can set the operating and releasing time delays for each stage.
Analog signals
The numerous analog signals have been divided into categories to help the user find the desired value.
Curr
Currents C
ents CT1 and C
T1 and CT2
T2
IL1
Description
IL1 ff (p.u.)
IL1 Fundamental frequency RMS value (in p.u.)
IL1 2
nd
h.
IL1 2
nd
harmonic value (in p.u.)
IL1 3
rd
h.
IL1 3
rd
harmonic value (in p.u.)
IL1 4
th
h.
IL1 4
th
harmonic value (in p.u.)
IL1 5
th
h.
IL1 5
th
harmonic value (in p.u.)
IL1 7
th
h.
IL1 7
th
harmonic value (in p.u.)
IL1 9
th
h.
IL1 9
th
harmonic value (in p.u.)
IL1 11
th
h.
IL1 11
th
harmonic value (in p.u.)
IL1 13
th
h.
IL1 13
th
harmonic value (in p.u.)
A
AQ
Q-T256
-T256
Instruction manual
Version: 2.06
162
© Arcteq Relays Ltd
IM00028
Summary of Contents for AQ-T256
Page 1: ...AQ T256 Transformer protection IED Instruction manual...
Page 2: ......
