7SR45 Performance Specification
© 2017 Siemens Protection Devices Limited Chapter 3 Page 9 of 10
Type Test Reference Parameters Values
Single Fault Condition IEC/EN 60255-27: Edition 2:
2013-10
Assessment of:
• Insulation between
circuits and parts
• Compliance with
requirements for
protection against
the spread of fire
• Overloads
• Intermittently rated
resistors
• Compliance with
requirements for
mechanical
protection
The equipment
shall not present
a risk of electric
shock or fire after
a single-fault test.
NOTE :
#
Pulse output X3 is excluded between any terminals and earth.
Table 1-15 Real Time Digital Simulation Test (RTDS)
Trip Response at different fault currents Fault Current: 1.1, 2, 3, 5, 10 times of set value
Influence on Accuracy
Influence of DC components
DC content at first peak : 100%
Decay time: 25 ms, 50 ms, 100 ms
Immunity to inrush current
2
nd
harmonic content : up to 28%
Relay behaviour at primary CT saturation
Fault currents: 10 A, 20 A, 40 A
Trip response at recurring faults Fault Current: 2 times and 5 times of set value.
Delay between recurring faults: 300 ms, 1 s, 2 s
Table 1-16 Inrush Response Test
Test Conditions Simulated Inrush current with 15 % 2nd
harmonic content
Test Result The relay does not operate until fault current
peak reaches 3 times the setting value
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