•
t = operating time
•
k = time dial setting
•
U
m
= measured voltage
•
U
s
= pick-up setting
•
a = IDMT multiplier setting
The following table presents the setting parameters for the function's time characteristics.
Table. 5.4.12 - 126. Setting parameters for operating time characteristics.
Name
Range
Step
Default
Description
Delay type 1: DT
2: IDMT
-
1: DT
Selection of the delay type time counter. The selection possibilities are
dependent (IDMT, Inverse Definite Minimum Time) and independent
(DT, Definite Time) characteristics.
Definite
operating
time delay
0.000…1800.000s 0.005s 0.040s
Definite time operating delay. The setting is active and visible when DT
is the selected delay type.
When set to 0.000 s, the stage operates as instant without added delay.
When the parameter is set to 0.005...1800 s, the stage operates as
independent delayed.
Time dial
setting k
0.01…60.00s
0.01s
0.05s
The setting is active and visible when IDMT is the selected delay type.
Time dial/multiplier setting for IDMT characteristics.
IDMT
Multiplier
0.01…25.00s
0.01s
1.00s
The setting is active and visible when IDMT is the selected delay type.
IDMT time multiplier in the U
m
/U
set
power.
Table. 5.4.12 - 127. Setting parameters for reset time characteristics.
Name
Range
Step
Default
Description
Release
time delay
0.000…150.000s 0.005s 0.06s
Resetting time. Time allowed between pick-ups if the pick-up has not led
to a trip operation. During this time the START signal is held on for the
timers if the delayed pick-up release is active.
Delayed
pick-up
release
1: No
2: Yes
-
2: Yes
Resetting characteristics selection either as time-delayed or as instant
after the pick-up element is released. If activated, the START signal is
reset after a set release time delay.
Time calc
reset after
release
time
1: No
2: Yes
-
2: Yes
Operating timer resetting characteristics selection. When active, the
operating time counter is reset after a set release time if the pick-up
element is not activated during this time. When disabled, the operating
time counter is reset directly after the pick-up element reset.
Continue
time
calculation
during
release
time
1: No
2: Yes
-
1: No
Time calculation characteristics selection. If activated, the operating time
counter continues until a set release time has passed even if the pick-up
element is reset.
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.
A
AQ
Q-M257
-M257
Instruction manual
Version: 2.07
© Arcteq Relays Ltd
IM00021
153
Summary of Contents for AQ-M257
Page 1: ...AQ M257 Motor protection IED Instruction manual...
Page 2: ......
