Current Transducer CT 1-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
=
1 A
Electrical data
I
P N
I
P
V
OUT
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 (± 5 %)
Current consumption
R.m.s. voltage for AC isolation test, 50 Hz, 1 mn
1
0 .. ± 2
5
1A/5V
> 500
≤
5
A
A
V
Ω
nF
s
V
mA
kV
Features
•
Closed loop (compensated) current
transducer
•
Insulated plastic case recognized
according to UL 94-V0
•
Patent pending.
∞
± 15
40 +
V
OUT
/
R
L
6
Advanced features
•
f
= 500 kHz
•
X
G
= ± 0.25 % (- 25°C .. + 70°C).
Accuracy - Dynamic performance data
X
G
V
O
f
Overall accuracy @
I
P N
Offset voltage @
I
P
= 0
- 25°C .. + 70°C
T
A
= 25°C
- 25°C .. + 70°C
± 0.25
Typ
Max
± 2.0
± 3.0
%
mV
mV
kHz
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.
Frequency bandwidth (- 3 dB) @ 50 % of
I
P N
DC .. 500
General data
T
A
T
S
m
Ambient operating temperature
Ambient storage temperature
Mass
Standards
- 25 .. + 70
- 40 .. + 85
670
EN 50178
°C
°C
g
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.
Note :
1)
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.
030331/4
LEM Components
w w w.lem.com
Dimensions CT 1-T
(in mm. 1 mm = 0.0394 inch)
Front view
Left view
Secondary terminals
Terminal
Terminal
Terminal
Terminal
+
M
0
-
:
:
:
:
supply voltage + 15 V
measure
0V
supply voltage - 15 V
Connection
Top view
Mechanical characteristics
•
•
•
•
General tolerance
Fastening
Connection of primary
Connection of secondary
Fastening torque max
± 0.3 mm
2 x M5 screws
M5 threaded studs
M5 threaded studs
2.2 Nm or 1.62 Lb - Ft
Remarks
•
V
OUT
is positive when
I
P
flows in the direction of the arrow.
•
This transducer induces into the primary circuit a square
wave of 70 mV amplitude (frequency
≈
220 Hz). This voltage
can induce an AC current in the primary if the primary
impedance is low.
•
This is a standard model. For different versions (supply
voltages, turns ratios, unidirectional measurements...),
please contact us.
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
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