Table 308:
Modification of internal FLC
Ambient Temperature T
amb
Internal FLC
<20°C
FLC x 1.09
20 to <40°C
FLC x (1.18 - T
amb
x 0.09/20)
40°C
FLC
>40 to 65°C
FLC x (1 –[(T
amb
-40)/100])
>65°C
FLC x 0.75
The ambient temperature is used for calculating thermal level and it is available in the
monitored data view from the
TEMP_AMB
output. The activation of the
BLOCK
input does
not affect the
TEMP_AMB
output.
The
Env temperature Set
setting is used:
•
If the ambient temperature measurement value is not connected to the AMB_TEMP
input in ACT.
•
When the ambient temperature measurement connected to 49M is set to
Not in use
in
the RTD function.
•
In case of any errors or malfunctioning in the RTD output.
Thermal level calculator
The module calculates the thermal load considering the TRMS and negative-sequence
currents. The heating up of the motor is determined by the square value of the load current.
However, in case of unbalanced phase currents, the negative-sequence current also causes
additional heating. By deploying a protection based on both current components,
abnormal heating of the motor is avoided.
The thermal load is calculated based on different situations or operations and it also
depends on the phase current level. The equations used for the heating calculations are:
θ
τ
B
r
r
t
I
k
I
K
I
k
I
e
p
=
×
+
×
×
×
−
(
)
×
−
2
2
2
2
1
/
%
GUID-526B455A-67DD-46E7-813D-A64EC619F6D7 V2 EN
(Equation 16)
θ
τ
A
r
r
t
I
k
I
K
I
k
I
e
=
×
+
×
×
×
−
(
)
×
−
2
2
2
2
1
100
/
%
GUID-9C893D3E-7CAF-4EA6-B92D-C914288D7CFC V2 EN
(Equation 17)
Section 4
1MAC059074-MB A
Protection functions
300
615 series ANSI
Technical Manual
Summary of Contents for Relion 615 series
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