General settings
The following general settings define the general behavior of the function. These settings are static i.e.
it is not possible to change them by editing the setting group.
Name
Description
Range Step Default
Measured
magnitude
Defines whether the ratio between the positive and the negative sequence currents
are supervised or whether only the negative sequence is used in detecting
unbalance.
1: I2pu
2: I2/I1
-
1: I2pu
Pick-up
The setting parameters
I2
set
and I2/I1
set
control the the pick-up of the I2> function. They define the
maximum allowed measured negative sequence current or the negative/positive sequence current ratio
before action from the function. The function constantly calculates the ratio between the
I
set
and the
measured magnitude (
I
m
). The reset ratio of 97 % is built into the function and is always relative to the
I
xset
value. The reset ratio is the same for both modes.
Table. 5.3.6 - 77. Pick-up settings.
Name
Description
Range
Step
Default
I2set
Pick-up setting for I2 mode.
0.01…40.00×I
n
0.01×I
n
0.2×I
n
I2/I1set
Pick-up setting for I2/I1 mode
1…200%
0.01%
20%
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. 5.3.6 - 78. Information displayed by the function.
Name
Range
Step
Description
I2> condition
0: Normal
1: Start
2: Trip
3: Blocked
-
Displays the status of the protection function.
Function blocking
The block signal is checked in the beginning of each program cycle. The blocking signal is received
from the blocking matrix in the function's dedicated input. If the blocking signal is not activated when
the pick-up element activates, a START signal is generated and the function proceeds to the time
characteristics calculation.
If the blocking signal is active when the pick-up element activates, a BLOCKED signal is generated and
the function does not process the situation further. If the START function has been activated before the
blocking signal, it resets and processes the release time characteristics similarly to when the pick-up
signal is reset.
The blocking of the function causes an HMI display event and a time-stamped blocking event with
information of the startup current values and its fault type to be issued.
A
AQ
Q-F205
-F205
Instruction manual
Version: 2.04
132
© Arcteq Relays Ltd
IM00013
Summary of Contents for AQ F205
Page 1: ...AQ F205 Feeder protection IED Instruction manual ...
Page 2: ......
