Instruction manual –AQ F210 Feeder Protection IED
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4.2.4.2
P
ICK
-
UP CHARACTERISTICS
Pick-up of the CUB function is controlled by
I2set or I2/I1set
setting parameters, which
define the maximum allowed measured negative sequence current or negative/positive
sequence current ratio before action from the function. The function constantly calculates
the ratio in between of the Iset and measured magnitude (Im). Reset ratio of 97 % is inbuilt
in the function and is always related to the
Ixset
value. The reset ratio is common for both
of the modes.
Table 4.2.4.2-37 Pick-up characteristics setting
Name
Description
Range
Step
Default
I2set
Pick-up setting for I2
0.005 … 40.00 x In 0.001 x In 1.20 x In
I2/I1set
Pick-up setting for I2/I1
1…200 %
1 %
20 %
The pick-up activation of the function is not directly equal to start-signal generation of the
function. Start signal is allowed if blocking condition is not active.
4.2.4.3
F
UNCTION BLOCKING
In the blocking element the block signal is checked in the beginning of each program cycle.
Blocking signal is received from the blocking matrix for the function 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 blocking signal is active when pick-up element activates a BLOCKED signal will be
generated and the function shall not process the situation further. If START function has
been activated before blocking signal it will reset and the release time characteristics are
processed as in case of when pick-up signal is reset.
From blocking of the function a HMI display event as well as time stamped blocking event
with information of the startup current values and fault type is issued.
Blocking signal can be tested also in the commissioning phase of the stage by software
switch signal when relay common and global testing mode is activated.
User settable variables are binary signals from the system. Blocking signal needs to reach
the IED minimum of 5 ms before the set operating delay has passed for blocking to be active
in time.
