Ice NP900 Series, Инструкция по применению

Страница: 139 / 504

Application Guide - NP900 Series 139 (504
)
A996A
Table 3.2.11.2-92 Thermal replica settings.
Name Range Step Default Description
IN thermal cap current 0.10…40.00 xIn 0.01 xIn 1.00 xIn Current for the 100 % thermal
capacity to be used (pick-up current
in p.u., with this current t
max
will be
achieved in time τ x 5). Default
setting is 1.00 xIn.
Set or estimate tau (t const) 0: Set
1: Estimate
- 0:Set Selection of the timeconstant setting.
If selection is “Set” then tau (t const)
setting is available and the used time
constant can be set there. If the
setting is “Estimate”, cable initial data
parameters are visible. Default
setting is “Set”.
tau (t const) 0.1…500.0 min 0.1 min 10.0 min Time constant setting. This time
constant is used for heating and
cooling of the protected object.
Setting is visible if Set or estimate tau
setting is selected to “Set”.
Max.Perm.OC.Current(norm
ik1s)
1…1000000 A 1 A 75000 A Maximum rated short circuit current
of the protected object (cable).
Usually this value is presented as 1
second value. Setting is visible if Set
or estimate tau setting is selected to
“Estimate”.
Max. OC. time (norm 1s) 0.1…5 s 0.1 s 1.0 s Time of the maximum rated short
circuit current (usually 1 second) of
the protected object. Setting is visible
if Set or estimate tau setting is
selected to “Estimate”.
Rated nominal current 1…1000000 A 1 A 700 A Rated nominal current in primary
value of the protected object in
nominal rated conditions. Setting is
visible if Set or estimate tau setting is
selected to “Estimate”.
Estimated tau 0…1800 min 0.005
min
191.3 min
(from
defaults)
Estimation result which is used for
thermal replica time constant. After
the previous three required
parameters are set the IED will
calculate this value. This value is
visible if Set or estimate tau setting is
selected to “Estimate”.
kSF (service factor) 0.01…5.00 0.01 1.00 Service factor which corrects the
maximum allowed current value
according to installation etc.
conditions which vary from the
presumption conditions.
Cold Reset default theta 0.0…150.0% 0.1% 60.0% Thermal image status in the restart of
the function / IED in percentage of
used thermal capacity of the
protected object. Default setting is
60% of thermal capacity used.