Thermal Overload; Reference; Operate And Reset Level; Operate And Reset Time - Siemens 7SR18 Solkor Manual

2.3

49 Thermal Overload

2.3.1

Reference

Parameter
Is Overload setting
i Applied Current (for operate time)
t
Time constant setting
2.3.2

Operate and Reset Level

Attribute
I Overload level
ol
Reset level
Repeatability
-10 °C to +55 °C
Variation
f
nom
2.3.3

Operate and Reset Time

Attribute
t Overload trip operate time
op
Repeatability
Note:- Fastest operate time is at 10 xIs
Unrestricted ©2018 Siemens Protection Devices Limited
Value
1.0 xIn
1.2 to 10 x Is
1, 10, 100, 1000 min
Value
100 % Is, ± 5 % or ± 1% In
³ 95 % I
± 1 %
£ 5 %
£ 5 %
± 5 %
Value
= t ´
t
where I
± 100 ms
7SR18 Performance Specification
ol
ì ü
-
2 2
I I
í P ý
ln
( )
- ´
2
2
î þ
I k I
±5 % or ±100 ms

B
= prior current
P
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