Application Guide - NP900 Series
362 (504
)
A996A
3.5.3.2
M
EASURED INPUT VALUE
For the function block is used analog current measurement values. Function uses the
fundamental frequency magnitude of the current measurement inputs and calculated
residual current with residual current measurement. For residual current measurement
can be selected I01 or I02.
Table 3.5.3.2-221 Analogic magnitudes used by the TOLT function.
Signal
Description
Time base
IL1RMS
Fundamental TRMS measurement of phase L1/A current
5 ms
IL2RMS
Fundamental TRMS measurement of phase L2/B current
5 ms
IL3RMS
Fundamental TRMS measurement of phase L3/C current
5 ms
RTD
Temperature measurement for the ambient correction
5 ms
Table 3.5.3.2-222 General settings of the TOLT stage (not SG selectable)
Name
Range
Step
Default
Description
TT> mode
0: Disabled
1: Activated
-
0:Disabled Selection of the function is activated or
disabled in the configuration. Default setting
0:Disabled (Not in use).
Temp C or F deg
0: C
1: F
-
0:C
Selection whether the temperature values
of the thermal image and RTD
compensation are shown in Celsius or
Fahrenheit degrees.
Table 3.5.3.2-223 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.
tau h (t const)
0.1…500.0 min 0.1 min
10.0 min
Time constant setting. This time
constant is used for heating of the
protected object.
tau c (t const)
0.1…500.0 min 0.1 min
10.0 min
Time constant setting. This time
constant is used for cooling of the
protected object.
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.
