Specifications
L2234
L2778
L4681
L5179
Emax
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Doc. No
Model
Apparatus
Scale
Page No
1SDH000460R0002
L5439
14.2.9.12. Protection against reverse active power “RP”
The PR123/P unit provides protection (which can be disabled) with an adjustable fixed time (t = k), against reverse active power,
active both with self-powering and auxiliary supply.
When the total reverse active power (sum of the power of the 3 phases) exceeds the set reverse active power threshold P
11
the
protection counts down the preset time interval t
11
and then opens.
The minus sign (‘-’) in front of the threshold and power indicates reverse power. The threshold is indicated as a percentage of
“Pn”, where “Pn” is the nominal power of the circuit-breaker (3 Vn*In).
14.2.9.13. Frequency protections “UF”, “OF”
The frequency protections record the mains frequency variations above an adjustable threshold (f
12
, t
12
) or below (f
13
, t
13
), generat-
ing an alarm or the opening of the circuit-breaker.
14.2.9.14. Double protections setting
Using the double protections setting, the PR123/P can save a set of alternative parameters for all the protections. The second
set of parameters (set B) can replace the default set (set A) by means of an external command. The passage from set A to set
B can be made when there is a change in the mains configuration or when there is an emergency capable of changing the load
capacity and the short-circuit levels.
The second set of parameters (set B) can be enabled by:
- digital input provided with the PR120/K module. For instance, it can be connected to an auxiliary contact of a bus-tie;
- communication network, by means of the PR120/D-M (e.g. when the switch is scheduled);
- directly from the user interface on the PR123/P (see settings menu par. 14.5.4);
- with a time that can be specified by set A or set B after the circuit-breaker has closed;
- depending on a Vaux being installed.
In operation, the state (set A and set B) is indicated on the display.
The double setting is disabled by default. To enable it, see par. 14.5.4.1.
14.2.9.15. Summary table of the protection function settings for the PR123/P
Protection
Disabling
Disabling TRIP only
Zone selectivity
Start-up threshold
Thermal memory
Threshold
range
Time
range
Threshold
tolerance
(2)
Time
Tolerance
(2)
L
(t=k/I
2
) curve
IEC 60255-3
0,4xIn
I
1
1xIn
step 0,01xIn
3 s t
1
144 s
(1)
, step 3 s
@If=3I
1
Release between
1,05 e1,2 xI1
± 10%, I
f
6In
± 20%, I
f
6In
S
1
(t=k)
0,6xIn I
2
10xIn
step 0,1xIn
0,6xIn I
2 start-up
10xIn
step 0,1xIn
I
f
>I2
0,05 s t
2
0,8 s, step 0,01s
0,10 s t
2 start-up
30 s, step 0,01s
0,04 s t
2 sel
0,20 s, step 0,01s
± 7%,I
f
≤ 6 In
± 10%,I
f
> 6 In
The best of
the two data
± 10% o 40 ms
S
1
(t=k/I
2
)
0,6xIn
I
2
10xIn
step 0,1xIn
0,05 s t
2
0,8 s,
step 0,01 s @I
f
=10In
± 7%,I
f
≤ 6 In
± 10%,I
f
> 6 In
± 15%, I
f
6In
± 20%, I
f
6In
S
2
(t=k)
0,6xIn
I
2
10xIn
step 0,1xIn
@I
f
>I
2
0,05 s t
2
0,8 s, step 0,01s
0,10 s t
2 start-up
30 s, step 0,01s
0,04 s t
2 sel
0,40 s, step 0,05s
± 7%,I
f
≤ 6 In
± 10%,I
f
> 6 In
The best of
the two data
± 10% o 40 ms
D
(t=k)
0,6xIn
I
7
10xIn
step 0,1xIn
@I
f
>I
7
0,20 s t
7
0,8 s, step 0,01s
0,10 s t
7 start-up
30 s, step 0,01s
0,13 s t
7 sel
0,50 s, step 0,01s
± 10%
The best of
the two data
± 10% o 40 ms
I
(t=k)
1,5xIn
I
3
15xIn
step 0,1xIn
1,5xIn I
3 start-up
15xIn
30 ms
0,10 s t
3 start-up
30 s, step 0,01 s
@ I
f
>I
3
± 10%
MCR
(t=k)
6,0xIn I
5
15xIn
step 0,1xIn
@I
f
>I
5
30 ms
(3)
± 10%
G
(4)
(t=k)
0,20xIn I
4
1xIn
step 0,02xIn
0,1 s t
4
1 s, step 0,05 s
0,1 s t
4 start-up
1 s, step 0,02 s
0,04 s t
4 sel
0,2 s, step 0,01 s
@ I>I
4
± 7%
The best of
the two data
± 10% o 40 ms
G
(4)
(t=k/I
2
)
0,20xIn I
4
1xIn
step 0,02xIn
0,2xIn I
4 start-up
1xI
4
0,1 s t
4
1 s, step 0,05 s
(minimum trip time)
@I
f
>4In
± 7% ± 15%
Gext
(t=k)
0,20xIn I
4
1xIn
step 0,02xIn
@I
f
>I
4
0,1 s t
4
1 s, step 0,05 s
0,1 s t
4 start-up
30 s, step 0.02 s
0,04 s t
4 sel
0,2 s, step 0,01 s
± 7%
The best of
the two data
± 10% o 40 ms
Gext
(t=k/I
2
)
0,20xIn I
4
1xIn
step 0,02xIn
0,1 s t
4
1 s, step 0,05 s
(minimum trip time)
@I
f
>4In
± 7% ± 15%
Rc
(6)
(Idn)
Idn =3,0-5,0-7,0-10-
20-30A
0,06-0,10-0,20-0,30-0,40-0,50-
0,80s
(3)
-20% 0 0,06s
(5)