Figure. 5.4.9 - 59. Bias current (the calculation is based on the user-selected mode).
Figure. 5.4.9 - 60. Characteristics settings.
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. 5.4.9 - 102. Information displayed by the function.
Name
Range
Description
I0d> LN
behaviour
1: On
2: Blocked
3: Test
4: Test/
Blocked
5: Off
Set mode of REF block.
This parameter is visible only when
Allow setting of individual LN mode is enabled in
General menu.
I0d> condition
0: Normal
1: Trip
2: 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 TRIP 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 TRIP 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).
A
AQ
Q-M257
-M257
Instruction manual
Version: 2.07
128
© Arcteq Relays Ltd
IM00021
Summary of Contents for AQ-M257
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