FUNCTION CHARACTERISTICS
45
NA011 - Manual - 05 - 2022
Test
The test function allows the checking of each 50-51 and 50N-51N protection function threshold by
means of the introduction of a dummy signal, with twice the setting threshold value and duration as
to cause the start and/or tripping of the threshold itself, into the input circuit stages of the relay.
This test does not include checking the system measuring transformers and the relevant connec-
tions to the digital protection relay.
Having activated the test function mode, the threshold relating to the protective function to be
checked and the relevant test method must be selected. The latter may or may not include changing
the status of the output relays assigned as the selected threshold start and /or trip.
For the thresholds relating to protective functions 50 and 51 the dummy signal is applied simultane-
ously over all phases.
Example, with setting t>inv = 1 s, the operate time for the first element 50/51is:
• 10 s with IEC/BS A characteristic
• 13.5 s with IEC/BS B characteristic
• 26.6 s with IEC/BS C characteristic
In cases involving selection of the test mode without any changes in the status of the output relays
(“blank” Testing), upon tripping of the selected threshold, the corresponding LED is lit and the test
outcome recorded as the most recent event. The test condition is shown by means of the blinking
green LED ON.
[1]
• Test I> led
• Test I>> led
• Test I>>> led
• Test IE> led
• Test IE>> led
In cases involving selection of the test mode with changes in the status of the output relays, at
the start and/or tripping of the selected threshold the corresponding programmed output relay is
switched, the corresponding LED lit and the outcome recorded as the most recent event. The test
condition is shown by means of the blinking green ON.
[2]
• Test I> full
• Test I>> full
• Test I>>> full
• Test IE> full
• Test IE>> full
For both modes the test may be ended by means of the
Test off
command;
in any case they are
ended after 2 minutes.
Oscillography
Set trigger
Following parameters, available inside the
Oscillography \ Setting
menu, are user-programmable:
•
Pre-trigger time
.
• With setting of the
Trigger
parameter
General start
or
General trip
the recording starts with
state change of any protection elements.
• With setting of the
Trigger
parameter
Manual
the recording starts with manual command (Thy-
Visor).
• With setting of the
Trigger
parameter
K1...K4
the recording starts with state change of the se-
lected output relay.
• With setting of the
Trigger
parameter
IN1, IN2, IN3
he recording starts with state change of
any binary input.
• With setting of the
rigger aux
parameter
Start I>, Start I>>, Start I>>>,....
the recording
starts with state change of start or trip of the selected protection element.
Set measured channels
The analog measures ((
i
L1
,
i
L2
,
i
L3
,
i
E
),
I
L1
,
I
L2
,
I
L3
,
I
E
) may be select inside the
Oscillography \ Setting
\ Analog channel 1...4
menu
.
Everyone of four analog channel may be associated to one of the selected measures.
Set digital channels
The desired I/O signals may be select inside the
Oscillography \ Setting \ Digital channels
menu
(General start, General trip, K1... K4, , IN1, IN2, IN3).
Note 1 The test is performed (LED) even if the concerning element is assigned to almost one output relay
Note 2 The test is performed (LED & relays) even if the concerning element is assigned to almost one output relay
trigger.ai
Trigger
Time
pre-trigger
record length
post-trigger
0...63 T