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12.3.3.1. L Protection
The L protection cannot be disabled.
On unit PR122/VF it is possible to select current threshold (I
Setting
Range Value
Threshold I
0.4In...1In (step 0.01In)
1
Time t
3s...102s (step 3s)
1
The unit applies an inversion time expression to calculate t
The expression considers the primary fault current (I
Condition
t
(s)
trip
t 1
--------------- -
≤ 10In
I
0,1178
f
I
> 10In
f
WARNING: L Threshold has activated in the range 1.05...1.2 of the setting.
The minimum trip time is 0.5s. See trip curves for further details.
12.3.3.2. I Protection
The I protection is enabled/disabled on protection menu.
On unit PR122/VF it is possible to select current threshold (I
Setting
Range Value
Enable
ENABLE/DISABLE
Threshold I
1.5In...10In (step 0.1In)
3
Startup Enable
ENABLE/DISABLE
Startup threshold
1.5In...10In (step 0.1In)
Startup time
0.1s...30s (step 0.01s)
While the I protection is turned OFF, only the L protection will operate for all the fault current range.
While the I protection is turned ON, the unit will trip by I protection with I
The Start-up function is enabled/disabled from the I protection menu.
The Start-up function enables the protection threshold I
during a t
time interval, starting from the passing of almost 1 of the phase
s
currents over the "Start-up activation threshold".
The "Start-up activation threshold" is an adjustable parameter for values
within the range 0.1...10In, with steps of 0.1In.
The parameter is available only by external communication, using the
module PR120/D-M ,or the external unit BT030-USB or Ekip T&P with
ABB Software Ekip Connect .
A new start is possible after the current has dropped below this threshold.
WARNING: On the display menu, the I protection settings (threshold and Startup parameters) are available to user
only with protection enabled.
About Startup function, all settings (threshold and time) are available to user only with function enabled.
12.3.3.3. T Protection
Inside unit PR122/VF, there is a temperarature sensor that monitors the temperature of the unit.
The sensor enables the signalling of any abnormal temperature conditions, which could cause temporary or continuous malfunctions
of the unit or the electronic components.
On unit PR122/VF it is possible to Enable the Trip in case of T alarm.
Setting
Range Value
Trip Enable
ENABLE/DISABLE
B2342
Model
Description
Set fault threshold of the primary current
Set t
), and the protection parameters (I
f
Example
2
( )
I f
I
= 0.8 x In; t
ln
------------------------------ -
×
1
2
2
I
= 1.5 x I1 (1.2 x In)
( )
I
–
( )
I
f
f
1
I
= 0.8 x In; t
0.5
1
I
= 15 x I
f
) and time (t
), and to define the preferred tripping time (t
1
1
of L protection
trip
.
trip
= 12s
t
=
1
trip
= 12s
1
t
= 0.5 s
(12 x In)
trip
1
), and there is the possibility to set Start-up parameters.
3
Description
Determines the presence or absence of the protection.
Determines the fault threshold of the primary current
Determines the presence/absence of the Start-up function.
Determines the start-up current threshold
Determines the activation duration of the start-up threshold
> I
. The t
f
3
I
to be changed
3
Description
Set the possibility of CB Opening in the case of T alarm
Apparatus
Doc. No
and t
):
1
1
2
12
1,2
(
)
--------------- -
ln
------------------------------------ -
×
0,1178
2
2
1,2
–
0,8
(
)
(
)
for I protection is ≤ 60ms.
trip
Start-Up Threshold I2
Threshold Start-Up activation
Activation of Start-Up
ts
Emax VF
1SDH000909R0001
).
trip
=
101,87 0,588
=
60s
×
Threshold I2
t
Scale
Page No
39/66
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