Pick-up
The
I0
set
setting parameter controls the the pick-up of the I0> function. This defines the maximum
allowed measured current before action from the function. The function constantly calculates the ratio
between the
I0
set
and the measured magnitude (
I
m
) for each of the three phases. The reset ratio of 97
% is built into the function and is always relative to the
I0
set
value. The setting value is common for all
measured phases. When the
I
m
exceeds the
I0
set
value (in single, dual or all phases) it triggers the
pick-up operation of the function.
Table. 5.4.3 - 59. Pick-up settings.
Name
Description
Range
Step
Default
I0
set
Pick-up setting
0.0001…40.00 × I
n
0.0001 × I
n
1.20 × I
n
The pick-up activation of the function is not directly equal to the START signal generation of the
function. The START signal is allowed if the blocking condition is not active.
Read-only parameters
The relay's
Info page displays useful, real-time information on the state of the protection function. It is
accessed either through the relay's HMI display, or through the setting tool software when it is
connected to the relay and its Live Edit mode is active.
Table. 5.4.3 - 60. Information displayed by the function.
Name
Range
Step
Description
I0> LN
behaviour
1: On
2: Blocked
3: Test
4: Test/Blocked
5: Off
-
Displays the mode of NEF block.
This parameter is visible only when
Allow setting of individual LN mode is
enabled in
General menu.
I0>
condition
0: Normal
1: Start
2: Trip
3: Blocked
-
Displays status of the protection function.
Detected
I0 angle
-360.00...360.00 deg
0.01
deg
Angle of I0 against reference. If phase voltages are available, positive sequence
voltage angle is used as reference. If voltages are not available, positive
sequence current angle is used as reference.
Detected
fault type
0: -
1: A-G-R
2: B-G-F
3: C-G-R
4: A-G-F
5: B-G-R
6: C-G-F
-
Displays the detected fault type and direction of previous fault. "A/B/C" stand for
one of the three phases. "G" stands for "ground". "F" stands for "forward" direction
and "R" stands for "reverse" direction.
Expected
operating
time
-1800.000...1800.000
s
0.005
s
Displays the expected operating time when a fault occurs. When IDMT mode is
used, the expected operating time depends on the measured current value. If
the measured current changes during a fault, the expected operating time
changes accordingly.
Time
remaining
to trip
0.000...1800.000 s
0.005
s
When the function has detected a fault and counts down time towards a trip, this
displays how much time is left before tripping occurs.
I
meas
/I
set
at the
moment
0.00...1250.00
0.01
The ratio between the measured current and the pick-up value.
A
AQ
Q-M257
-M257
Instruction manual
Version: 2.07
© Arcteq Relays Ltd
IM00021
73
Summary of Contents for AQ-M257
Page 1: ...AQ M257 Motor protection IED Instruction manual...
Page 2: ......
