Poznámky redaktora
The function active when auxiliary power supply present, supply from PR120/V (see par. 0,3 . This done contactors switch-disconnectors (wired outside the release), controlled the PR122/DC means contacts the
PR120/K module the PR021/K external unit.3)
The operating logic involves the activation three contacts when the preset thresholds LC1, LC2 and Iware exceeded.2.
(3) no-trip tim e
12.1xIn
< ms(3) 10%
k)
=
of
□ Fixed, defined by
SACE
Instantaneous 5°C -
linst Automatic, defined
by SACE
Instantaneous
LC1/LC2 loads
control
H 50%-100% step 0,05xI1
Warning 0,3-10I step 0,05xI’ 10% 10+40 ms
(1) The value trip regardle typ curve set (self
protection).1.0 step 0.1 Table measurements
For all cases not covered the above hypotheses, the follow ing tolerance values
apply:
Protections Trip threshold Trip time
L elease 1,05 1,25 20%
S 10% 20%
I 15% 60m s
O 20%
Type measurement
Range values measured the relay
Standard operation range
Range Tolerance %
Current 0,05 . The allowable values are given the following table:
Warning current 0.12.9...7.
Thresholds LC1 and LC2 are expressed percentage Ifl (current threshold specified for protection while the "warning current" Iwis expressed
as absolute value.2.
34/1 08
.9.9.30 10..0xIn I5< 10xIn
step 0.6 Load control function
Single loads can enabled/disabled the load side before the overload protection intervenes and trips the circuit-breaker the supply
side. 14.2. 5
Model 3447
A pparatus Emax DC
S cale
D 1SDH000635R0002
Page No.05xIn
Threshold LC1________________ 50% 100% step xI,
Threshold LC2________________50% 100% step x^
From the PR122/DC you can associate each the PR120/K PR121/K contacts with configuration (NO NC), delay and the eventual latch. 0,05 .
(2) These tolerances are based follow ing assum ptions:
- relay ithout start-up)
- preset trip tim 100 ms.
12..7 Summary table the protection function settings for the PR122/DC
Protection
Disabling
Disablingof
TRIPonly
Zoneselectivity
Start-upthreshold
Í
0
E
e
E
<s
E
<5
ř
Trip Threshold Trip Time Trip
threshold
tolerance <2>
Trip time
tolerance <2>
L
curve
IEC 60255-8
□ 0,4xIn Ifl 1xIn
step 0,01xIn
3 102s(1), step s
t 3Ifl
Release between
,05 and xI1
± 10%, 4In
± 20%, 4In
g
S
(t k)
H 0,6 xIn <10xIn
step 0,1xIn
0,6 xIn <10xIn2start-up
step 0,1xIn
0,05 t2< 0,35 step 0,01s
0,10 t2stait_up< step 0,01s
0,04 t2sel 0,20 step 0,01s
± ,Ig< In
± In
T ta
± 10% s
S
(t= k/i2)
H 0,6xIn <10xIn
step 0,1xIn
0,05 t2< 0,35 s,
step 0,01 10xIn
± ,Ig< In
± 10% ,Ig> In
± 15%, 4In
± 20%, 4In
g
I
(t= k)
H 1,5xIn I3< 10xIn
step 0,1xIn
< ms
0,10 t2^ step 0,01 s
where I>I4
± 10%
MCR
(t= k)
H 6..
The current thresholds are lower than those available with the protection that the load control can used prevent tripping due overloads.
