Siemens Protection Devices Limited 7
0.01
0.1
1
10
100
1000
10000
110100
Current (multiple of setting) - I/Is
Time (s)
normal inverse
very inverse
extremely inverse
long time inverse
Accuracy ± 10ms
Repeatability ± 5 ms
Reset delay
Setting 0 to 60 sec
Accuracy ± 1% or ± 10ms
Repeatability ± 1% or ± 5 ms
DTL
No. of elements 3
Level
Setting Range Is 0.05 to 52.5 x In
Operate: 100% Is, ±5% or,
±10mA
Accuracy
Reset ≥ 95% of operate current
Repeatability ± 1%
DTL Delay
Setting 0.00 to 20.00 sec
Accuracy ± 5ms
Repeatability ± 1% or ± 5 ms
SEF/REF
No. of elements 2 delays
Level
Setting Range Is 0.005 to 0.96 x In
Operate: 100% Is, ±5% Accuracy
Reset ≥ 95% of operate current
Repeatability ± 1%
DTL Delay
Setting 0.00 to 20.00 sec
Accuracy ± 5ms
Repeatability ± 1% or ± 5 ms
Earth fault protection
As overcurrent protection.
Fig 1. IEC IDMTL Curves
[]
⎥
⎥
⎦
⎤
⎢
⎢
⎣
⎡
−
×=
1
K
Tmt
α
Is
I
operate
I =fault current
Is =current setting
Tm = time multiplier
NI: K = 0.14 α = 0.02
VI: K = 13.5 α = 1.0
EI: K = 80.0 α = 2.0
LTI: K = 120.0 α = 1.0
Circuit breaker failure (50BF)
Characteristics DTL
No. of elements 3
DTL Delay
Re-trip 0.00 to 20.00 sec
Setting
Back-trip 0.00 to 20.00 sec
Accuracy ± 5ms
Repeatability ± 1%
CT Failure (60CTS)
Characteristics DTL
No. of elements 1
Level
Setting Range OFF, 0.05 to 1 x In
DTL Delay
Setting 0 to 300 sec
Auto-reclose (79)
No. of Shots 1 to 4
Delay
Deadtime 0.2 to 14400 sec
Close Pulse 1.0 to 10.0 sec
Reclaim 0.2 to 14400 sec
Settings
Lockout Off, 0.2 to 14400
sec
Accuracy ± 1 % or ± 10 ms
Repeatability ± 1%
Instrumentation
Currents
Reference conditions
I ≥ 0.1 xIn
Accuracy ± 1 % of In
Voltages
Reference conditions
V ≥ 0.8 xVn
Accuracy ± 1 % of Vn
Power and Apparent Power
Reference conditions
V = Vn, I ≥ 0.1 xIn, pf ≥ 0.8
Accuracy ± 3 % of Pn where Pn = Vn x In
Power Factor
Reference conditions
V = Vn, I ≥ 0.1 xIn, pf ≥ 0.8
Accuracy ± 0.05
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