7SR45 Performance Specification
© 2017 Siemens Protection Devices Limited Chapter 3 Page 10 of 10
1.4 Performance Specification
This section describes about the settings available for different protection functions and its tolerance limits.
Table 1-17 50 Instantaneous & DTL OC & EF
Operation Non directional
Elements Phase, Derived Earth, Measured Earth
Setting Range Is (50/50N/50G) 0.2, 0.3,..... 20.0xIn
Time Delay 0,0.01,....600 s
Operate Level I
op
100% Is, ±5%
Reset level
> 0.2xIn to 0.9xIn setting: ≥ 91 % I
op
> 1xIn to 20xIn setting: ≥ 94 % I
op
Basic Operate time
(with load current)
50, 50G
50N
2xI
S
25 ms, ±15 ms,
5xI
S
20 ms, ±15 ms
Operate time delay Tbasic+Td, ± 1% or ± 30 ms
Inhibited by Binary Input
Table 1-18 51 Time Delayed OC & EF
Operation Non directional
Elements Phase, Derived Earth, Measured Earth
Setting Range Is (51) 0.2, 0.21… 2.0xIn
Setting Range Is (51G, 51N) 0.1,0.11… 0.8xIn
Time Multiplier 0.01 to 10
Time Delay (DTL) 0 s - 15 s
Operate Level 110% Is, ±5% or ±2%x In
Reset level ≥90 % Iop
Minimum Operate time
(with load current)
IEC
ANSI
[]
Tm
K
t
Is
I
op
×
−
=
1
α
[]
B
A
t
P
Is
I
op
×
+
−
=
1
± 5% or ± 50 ms
Follower Delay 0 s - 20 s
Reset IEC/ANSI decaying, 0 s - 60 s
Inhibited by Binary Input
Table 1-19 50LC/SOTF
Operate level 100% Is, ±5%
Setting range 1,2,....20xIn
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