Functions
6-64
7SJ63 Manual
C53000-G1140-C120-1
Figure 6-30
Logic Diagram for Dynamic Cold Load Pickup Feature
6.4.2
Programming Settings
General
Dynamic cold load Pickup feature can only be enabled if address
&ROGORDG
3LFNXS
was set to
(QDEOHG
during configuration of protective functions. If the func-
tion is not required, address
should be set to
'LVDEOHG
.
Time Delays
There are no specific procedures on how to set the time delays at addresses
&%
2SHQ7LPH
,
$FWLYH7LPH
and
6WRS7LPH
. These time delays must be
based on the specific loading characteristics of the equipment being protected, and
should be selected to allow the brief overloads associated with dynamic cold load con-
ditions.
$FWLYH7LPH
Circuit-
Breaker
Closed
&%2SHQ7LPH
%NU&ORVHG,0,1
I
a
, I
b
, I
c
1R&XUUHQW
%UHDNHU&RQWDFW
“1“
6WDUW&RQGLWLRQ
&
S Q
R
>BLK CLP stpTim
or
>52-a
>52-b
or
&
or
2))
21
“1“
&2/'/2$'3,&.83
> BLOCK CLP
CLP running
Measurement/Logic
CLP BLOCKED
CLP OFF
&
or
Ι<
Max. of
T
0
&
Dynamic Pickup
T
0
6WRS7LPH
T
0
Dyn Set. Activated
52a Configured
52b Configured
or
&
Normal Pickup
F# 1731
F# 4601
F# 4602
F# 1730
F# 1995
F# 1996
F# 1994
or
Exceeding one of the dynamic cold pick-up thresholds of
the directional or non-directional overcurrent elements
(Address blocks 18 to 21)
Exceeding one of the „normal“ pick-up thresholds of the di-
rectional or non-directional overcurrent elements
Processing of the
cold load pick-up
settings in the overcurrent
elements
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