Datasheet

LEM reserves the right to carry out modications on its transducers, in order to improve them, without prior notice.
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Current Transducer LF 305-S
For the electronic measurement of currents: DC, AC, pulsed...,
with galvanic isolation between the primary circuit (high power)
and the secondary circuit (electronic circuit).
Electrical data
I
PN
Primary nominal current rms 300 A
I
PM
Primary current, measuring range 0 .. ± 500 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 @ ± 300 A
max
0 37 0 35 Ω
 @ ± 500 A
max
0 10 0 8 Ω
 with ± 15 V @ ± 300 A
max
0 56 0 54 Ω
 @ ± 500 A
max
0 21 0 19 Ω
with ± 20 V @ ± 300 A
max
0 88 0 86 Ω
 @ ± 500 A
max
0 40 0 38 Ω
I
SN
Secondary nominal current rms 150 mA
K
N
Conversion ratio 1 : 2000
V
C
Supply voltage (± 5 %) ± 12 .. 20 V
I
C
Current consumption 26 (@± 20V)+ I
S
mA
X
G
Overall accuracy @ I
PN
, T
A
= 25°C ± 0.5 %
Accuracy - Dynamic performance data
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
± 0.2 mA
I
OT
Temperature variation of I
O
- 40°C .. + 85°C ± 0.2 ± 0.7 mA
- 10°C .. + 70°C ± 0.1 ± 0.3 mA
t
ra
Reaction time to 10 % of I
PN
< 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 (- 1 dB) DC .. 100 kHz
T
A
Ambient operating temperature - 40 .. + 85 °C
General data
T
S
Ambient storage temperature - 40 .. + 85 °C
R
S
Secondary coil resistance @ T
A
= 70°C 30 Ω
T
A
= 85°C 32 Ω
m Mass 95 g
Standards EN 50178:1997
Notes:
1)
The result of the coercive eld of the magnetic circuit
2)
With a di/dt of 100 A/µs.
I
PN
= 300 A
Features
Closed loop (compensated) ●
current transducer using the Hall
effect
Isolated plastic case recognized ●
according to UL 94-V0.
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 domains
Industrial. ●
16167