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Siemens 7SR242 Duobias Technical Manual page 115

Transformer protection relay
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Chapter 3) 7SR242 Duobias Performance Specification
100000
10000
= 1000 mins
1000
Time
(sec)
= 100 mins
100
= 10 mins
10
= 1 min
1
0.1
0
1
2
3
4
5
6
7
8
9
10
Current (multiple of setting)
Figure 2-1
Thermal Overload Protection Curves
©2015 Siemens Protection Devices Limited
Chapter 3 Page 27 of 50

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