Name
Range
Step Default
Description
Measurement
input
IL1/IL2/
IL3
I01
I02
-
IL1/IL2/
IL3
Selection of the measurement input (either phase current or residual current).
Each function stage provides these same settings. Multiple stages of the function can be set to operate
independently of each other.
Pick-up
The setting parameter
Ih
set
per unit or
Ih/IL (depending on the selected operating mode) controls the
pick-up of the Ih> function. This defines the maximum allowed measured current before action from the
function. The function constantly calculates the ratio between the
Ih
set
per unitor
Ih/IL 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
Ih
set
per unit or
Ih/ILvalue. 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. 5.3.7 - 83. Pick-up settings.
Name
Range
Step
Default
Description
Ih
set
pu
0.05…2.00×I
n
0.01×I
n
0.20×I
n
Pick-up setting
(per unit monitoring)
Ih/IL
5.00…200.00%
0.01%
20.00%
Pick-up setting
(percentage monitoring)
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. 5.3.7 - 84. Information displayed by the function.
Name
Range
Step
Description
Ih>
condition
0: Normal
1: Start
2: Trip
3: Blocked
-
Displays the status of the protection function.
Ih meas/
Ih set
now
0.00...100000.00I
m
/I
set
0.01I
m
/I
set
The ratio between the monitored residual current and the pick-up value.
Expected
operating
time
0.000...1800.000s
0.005s
Displays the expected operating time when a fault occurs. When IDMT
mode is used, the expected operating time depends on the measured
voltage value. If the measured voltage changes during a fault, the expected
operating time changes accordingly.
Time
remaining
to trip
-1800.000...1800.000s 0.005s
When the function has detected a fault and counts down time towards a
trip, this displays how much time is left before tripping occurs.
A
AQ
Q-T215
-T215
Instruction manual
Version: 2.04
139
