LA255-S Datasheet, PDF (1/2 Pages) LEM – Current Transducer LA 255-S

Current Transducer LA 255-S
For the electronic measurement of currents : DC, AC, pulsed...,
with a galvanic isolation between the primary circuit (high power)
and the secondary circuit (electronic circuit).
I_PN = 250 A
Electrical data
I_PN
I_P
Î_{P max}
R_M
Primary nominal r.m.s. current
Primary current, measuring range
Measuring overload ¹⁾
Measuring resistance @
with ± 12 V
with ± 15 V
with ± 18 V
@ ± 250 A _max
@ ± 500 A
max
@ ± 250 A _max
@ ± 500 A _max
@ ± 250 A _max
@ ± 500 A _max
I
Secondary nominal r.m.s. current
SN
K _N Conversion ratio
V
Supply voltage (± 5 %)
C
I_C
Current consumption
V
R.m.s. rated voltage ²⁾, safe separation
b
basic isolation
250
A
0 .. ± 500
A
600
A
T_A = 70°C T_A = 85°C
R R R R _{M min M max M min M max}
0 49 0 47 Ω
07 05 Ω
5 70 5 68 Ω
5 17 5 15 Ω
25 93 25 91 Ω
25 29 25 27 Ω
125
mA
1 : 2000
± 12 .. 18
V
20 (@ ± 15 V) + I_S mA
1625
V
3250
V
Accuracy - Dynamic performance data
εX G
L
I_O
I_OM
I_OT
t
ra
t_r
di/dt
f
Overall accuracy @ I_PN , T_A = 25°C
Linearity
± 0.8
%
< 0.1
%
Typ Max
Offset current @ I_P = 0, T_A = 25°C
± 0.15 mA
Residual current ³⁾ @ I_P = 0, after an overload of 3 x I_PN
± 0.50 mA
Thermal drift of I_O
- 10°C .. + 85°C ± 0.15 ± 0.30 mA
Reaction time @ 10 % of I
P max
Response time ⁴⁾ @ 90 % of I_{P max}
di/dt accurately followed
< 500
<1
> 100
ns
µs
A/µs
Frequency bandwidth (- 3 dB)
DC .. 100
kHz
General data
T_A
Ambient operating temperature
T
Ambient storage temperature
S
R _S Secondary coil resistance @
m
Mass
- 10 .. + 85
°C
- 40 .. + 90
°C
T_A = 70°C 35
Ω
T = 85°C 37
A
Ω
110
g
Standards ⁵⁾
EN 50178
Notes : ¹⁾ 3 mn/hour @ V_C = ± 15 V, R _M = 5 Ω
2) _{Pollution class 2. With a non insulated primary bar which fills the}
through-hole
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}
Features
•Closed loop (compensated) 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.
980707/3
LEM Components
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