Name
Range
Step
Description
Detected
I0 angle
-360.00...360.00deg
0.01deg
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
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 current
value. If the measured current 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.
I
meas
/I
set
at the
moment
0.00...1250.00
0.01
The ratio between the measured current and the pick-up value.
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. Additionally, non-directional earth fault
protection includes an internal inrush harmonic blocking option which is applied according to the
parameters set by the user. 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.
Table. 5.3.3 - 40. Internal inrush harmonic blocking settings.
Name
Description
Range
Step
Default
Inrush harmonic blocking (internal-
only trip)
Enables and disables the 2
nd
harmonic
blocking.
0: No
1: Yes
-
0: No
2
nd
harmonic block limit (Iharm/
Ifund)
The 2
nd
harmonic blocking limit.
0.10…50.00%I
fund
0.01%I
fund
0.01%I
fund
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.
The blocking signal can also be tested in the commissioning phase by a software switch signal when
the relay's testing mode "Enable stage forcing" is activated (
General
→
Device).
The variables the user can set are binary signals from the system. The blocking signal needs to reach
the device minimum of 5 ms before the set operating delay has passed in order for the blocking to
activate in time.
A
AQ
Q-F201
-F201
Instruction manual
Version: 2.04
83
Содержание AQ-F201
Страница 1: ...AQ F201 Overcurrent and Earth fault relay Instruction manual ...
Страница 220: ...Figure 7 4 146 Example block scheme A AQ Q F201 F201 Instruction manual Version 2 04 219 ...
Страница 226: ...Figure 8 4 151 Device installation A AQ Q F201 F201 Instruction manual Version 2 04 225 ...
Страница 227: ...Figure 8 4 152 Panel cutout dimensions and device spacing A AQ Q F201 F201 Instruction manual Version 2 04 226 ...