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4.4
Thermal Overload Protection (ANSI 49)
Setting Ranges / Increments
Factor k according to IEC 60255-8
Time constant τ
Extension of Time Constant at Standstill
Thermal alarm Θ
referred to the tripping temperature
Current Overload I
Nominal Overtemperature (for I
Coolant Temperature for Scaling
Limit current I
Emergency time
T
Emergency Start
Tripping Characteristic
see also Figure 4-4
Dropout Ratios
Θ/Θ
Off
Θ/Θ
Alarm
I/I
Warn
Tolerances
Referring to k · I
referred to Trip Time
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
/Θ
Alarm
Trip
for I
= 1 A
Alarm
N
for I
= 5 A
N
)
N
for I
= 1 A
Limit
N
for I
= 5 A
N
Dropout with Θ
approx. 0.99
approx. 0.95
for I
N
for I
0.10 to 4.00
30 s to 32000 s
1.0 to 10.0
70 % to 100 %
0.10 A to 4.00 A
0.50 A to 20.00 A
40 °C to 200 °C
40 °C to 300 °C
0.50 A to 8.00 A
2.00 A to 40.00 A
10 s to 15000 s
Alarm
= 1 A
2 % or 10 mA ; class 2 % acc. to
N
IEC 60255-8
= 5 A
2 % or 50 mA ; class 2 % acc. to
N
IEC 60255-8
3 % or 1 mA ; class 3 % acc. to
IEC 60255-8 for I/(k ·I
Technical Data
4.4 Thermal Overload Protection (ANSI 49)
Increments 0.01
Increments 1 s
Increments 0.1
Increments 1 %
Increments 0.01 A
Increments 0.01 A
Increments 1 °C
Increments 1 °C
Increments 0.01 A
Increments 0.01 A
Increments 1 s
) > 1.25
N
471
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