Datasheet

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31October2011/version 8 LEM reserves the right to carry out modications on its transducers, in order to improve them, without prior notice www.lem.com
Current Transducer LF 205-S/SP3
For the electronic measurement of currents: DC, AC, pulsed...,
with galvanic isolation between the primary circuit and the secondary
circuit.
Electrical data
I
PN
Primary nominal current rms 100 A
I
PM
Primary current, measuring range 0 .. ± 200 A
R
M
Measuring resistance @ T
A
= 70°C T
A
= 85°C
R
M min
R
M max
R
M min
R
M max
with ± 12 V @ ± 100 A
max
0 95 15 94 Ω
@ ± 200 A
max
0 40 15 39 Ω
with ± 15 V @ ± 100 A
max
16 123 47 122 Ω
@ ± 200 A
max
16 55 47 54 Ω
I
SN
Secondary nominal current rms 100 mA
K
N
Conversion ratio 1 : 1000
V
C
Supply voltage (+ 5 %) ± 12 .. 15 V
I
C
Current consumption @ ± 15 V 17 + I
S
mA
Accuracy - Dynamic performance data
X
G
Overall accuracy @ I
PN
, T
A
= 25°C ± 0.5 %
ε
L
Linearity error < 0.1 %
Typ Max
I
O
Offset current @ I
P
= 0, T
A
= 25°C ± 0.2 mA
I
OM
Magnetic offset current
1)
@ I
P
= 0 and specied R
M
,
after an overload of 3 x I
PN
± 0.1 mA
I
OT
Temperature variation of I
O
- 40°C .. + 85°C ± 0.25 ± 0.65 mA
t
ra
Reaction time to 10 % of I
PN
step < 500 ns
t
r
Response time
2)
to 90 % of I
PN
step < 1 µs
di/dt di/dt accurately followed > 100 A/µs
BW Frequency bandwidth (- 3 dB) DC .. 100 kHz
General data
T
A
Ambient operating temperature - 40 .. + 85 °C
T
S
Ambient storage temperature - 40 .. + 90 °C
R
S
Secondary coil resistance @ T
A
= 70°C 10 Ω
  @ T
A
= 85°C 11 Ω
m Mass 78 g
Standards EN 50178: 1997
Notes:
1)
The result of the coercive force (Hc) of the magnetic circuit
2)
With a di/dt of 100 A/µs.
I
PN
= 100 A
Features
● Closed loop (compensated)
current transducer using the Hall
effect
● Isolated plastic case recognized
according to UL 94-V0.
Special features
● I
PN
= 100 A
● I
PM
= 0 .. ± 200 A
● K
N
= 1 : 1000.
Advantages
● Excellent accuracy
● Very good linearity
● Low temperature drift
● Optimized response time
● Wide frequency bandwidth
● No insertion losses
● High immunity to external
interference
● Current overload capability.
Applications
● AC variable speed drives and
servo motor drives
● Static converters for DC motor
drives
● Battery supplied applications
● Uninterruptible Power Supplies
(UPS)
● Switched Mode Power Supplies
(SMPS)
● Power supplies for welding
applications.
Application domain
● Industrial.
16144