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Chapter 3 - 7SR45 Performance Specification
©2018 Siemens Protection Devices Limited
Chapter 3 Page 12 of 14
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.
Table 1-17
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 1-18
Inrush Response Test
Test Conditions
Simulated Inrush current with 15 % 2
nd
harmonic
content
Test Result
The immunity against inrush currents is up to 3 times
of the peak value with 95 % fundamental current (I
set
).