Current Transducer CT 25-T
For very accurate measurements of currents : DC, AC, pulsed...,
with a galvanic isolation between the primary circuit (high power)
and the secondary circuit (electronic circuit).
I
PN
=
25 A
Preliminary
Electrical data
I
P N
I
P
V
O U T
K
N
R
L
C
L
t
C
V
C
I
C
V
d
Primary nominal r.m.s. current
Primary current, measuring range
Analog output voltage
Conversion ratio
Load resistance
Capacitance loading
Output short-circuit duration
1)
Supply voltage (鹵 5 %)
Current consumption
R.m.s. voltage for AC isolation test, 50 Hz, 1 mn
25
0 .. 鹵 37.5
5
25 A / 5 V
>
500
鈮?/div>
5
A
A
V
鈩?/div>
nF
s
V
mA
kV
Features
鈥?/div>
Closed loop (compensated) current
transducer
鈥?/div>
Insulated plastic case recognized
according to UL 94-V0
鈥?/div>
Patent pending.
鈭?/div>
鹵 15
90 +
V
OUT
/
R
L
6
Advanced features
鈥?/div>
f
= 500 kHz
鈥?/div>
X
G
= 鹵 0.1 % (- 25擄C .. + 70擄C).
Accuracy - Dynamic performance data
X
G
V
O
f
Overall accuracy @
I
PN
Offset voltage @
I
P
= 0
- 25擄C .. + 70擄C
T
A
= 25擄C
- 25擄C .. + 70擄C
鹵 0.1
Typ
Max
鹵 0.4
鹵 0.6
%
mV
mV
kHz
Advantages
鈥?/div>
Excellent accuracy
鈥?/div>
Very good linearity
鈥?/div>
Low temperature drift
鈥?/div>
Optimized response time
鈥?/div>
Wide frequency bandwidth
鈥?/div>
No insertion losses
鈥?/div>
High immunity to external
interference
鈥?/div>
Current overload capability.
- 25 .. + 70
- 40 .. + 85
670
EN 50178
擄C
擄C
g
Frequency bandwidth (- 3 dB) @ 10 % of
I
PN
DC .. 500
General data
T
A
T
S
m
Ambient operating temperature
Ambient storage temperature
Mass
Standards
2)
Applications
鈥?/div>
AC variable speed drives and servo
motor drives
鈥?/div>
Static converters for DC motor drives
鈥?/div>
Battery supplied applications
鈥?/div>
Uninterruptible Power Supplies
(UPS)
鈥?/div>
Switched Mode Power Supplies
(SMPS)
鈥?/div>
Power supplies for welding
applications.
Notes :
1)
2)
If the short-circuit has a duration more than 1 s, the primary current of
the supply voltage must be interrupted for a short time to restore the
transducer to proper working order. The internal protection is done by
PTC resistors
A list of corresponding tests is available.
980814/5
LEM Components
w w w .lem.com
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