The selection of the used AI channel is made with a setting parameter. In all possible input channel
variations the pre-fault condition is presented with a 20 ms averaged history value from -20 ms
from START or TRIP event.
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.
Table. 5.4.3 - 64. General settings of the function.
Name
Range
Step Default
Description
Setting control from
comm bus
1:
Disabled
2: Allowed
-
1:
Disabled
Activating this parameter allows changing the pick-up level of the
protection stage via SCADA.
Measured magnitude
1: RMS
2: TRMS
3: Peak-to-
peak
-
1: RMS
Defines which available measured magnitude is used by the function.
Pick-up
The
I
set
setting parameter controls the pick-up of the I> function. This defines the maximum allowed
measured current before action from the function. The function constantly calculates the ratio
between the
I
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
I
set
value. The setting value is common for all
measured phases, and when the
I
m
exceeds the
I
set
value (in single, dual or all phases) it triggers the
pick-up operation of the function.
Table. 5.4.3 - 65. Pick-up settings.
Name
Description
Range
Step
Default
I
set
Pick-up setting
0.10…50.00×I
n
0.01×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 - 66. Information displayed by the function.
Name
Range
Step
Description
I>
condition
0: Normal
1: Start
2: Trip
3: Blocked
-
Displays status of the protection function.
A
AQ
Q-C215
-C215
Instruction manual
Version: 2.07
© Arcteq Relays Ltd
IM00040
113