LA25-NP Datasheet, PDF (1/2 Pages) LEM – Current Transducer LA 25-NP

Current Transducer LA 25-NP
For the electronic measurement of currents : DC, AC, pulsed,
mixed, with a galvanic isolation between the primary circuit
(high power) and the secondary circuit (electronic circuit).
I_PN = 5-6-8-12-25 A
Electrical data
I_PN
Primary nominal r.m.s. current
I
Primary current, measuring range
P
R_M Measuring resistance
with ± 15 V
@ ± 25 At _max
@ ± 36 At
max
I_SN
Secondary nominal r.m.s. current
K _N Conversion ratio
V_C Supply voltage (± 5 %)
I_C
Current consumption
V_d
R.m.s. voltage for AC isolation test, 50 Hz, 1 mn
V_b
R.m.s. rated voltage ¹⁾, safe separation
basic isolation
25
At
0 .. ± 36
At
R_{M min}
R_{M max}
100 320 Ω
100 190 Ω
25
mA
1-2-3-4-5 : 1000
± 15
V
10 + I_S
mA
2.5
kV
600
V
1700
V
Accuracy - Dynamic performance data
X
ε_L
Accuracy @ I_PN , T_A = 25°C
Linearity
± 0.5
%
< 0.2
%
Typ Max
I
Offset current ²⁾ @ I = 0, T = 25°C
O
P
A
± 0.05 ± 0.15 mA
I_OM
Residual current ³⁾ @ I_P = 0, after an overload of 3 x I_PN ± 0.05 ± 0.15 mA
I
Thermal drift of I
OT
O
0°C .. + 25°C ± 0.06 ± 0.25 mA
+ 25°C .. + 70°C ± 0.10 ± 0.35 mA
t_r
di/dt
f
Response time ⁴⁾ @ 90 % of I_{P max}
di/dt accurately followed
Frequency bandwidth (- 1 dB)
<1
> 50
DC .. 150
µs
A/µs
kHz
General data
T
Ambient operating temperature
A
T_S
Ambient storage temperature
R
Primary resistance per turn @ T = 25°C
P
A
R _S Secondary coil resistance @ T_A = 70°C
R _IS Isolation resistance @ 500 V, T_A = 25°C
m
Mass
Standards ⁵⁾
0 .. + 70
°C
- 25 .. + 85
°C
< 1.25
mΩ
110
Ω
> 1500
MΩ
22
g
EN 50178
Features
•Closed loop (compensated) multi-
range current transducer using the
Hall effect
•Insulated 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.
Notes : ¹⁾ Pollution class 2
2) _{Measurement carried out after 15 mn functionning}
3) _{The result of the coercive field of the magnetic circuit}
4) _{With a di/dt of 100 A/µs}
5) _{A list of corresponding tests is available}
LEM Components
980909/8
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