Current Transducer CT 5 .. 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
=
5 .. 25 A
0632
Electrical data
Primary nominal
current
I
PN
(A r.m.s.)
5
10
25
Primary current,
measuring range
I
P
(A)
7.5
15
37.5
Conversion
ratio
K
N
(A/V)
5 A/5 V
10 A/ 5 V
25 A/5 V
CT 5-T
CT 10-T
CT 25-T
Type
Features
•
Closed loop (compensated) current
transducer
•
Insulated plastic case recognized
according to UL 94-V0
•
Patent pending.
V
Ω
nF
s
V
mA
V
O U T
R
L
C
L
t
C
V
C
I
C
Analog output voltage
Load resistance
Capacitance loading
Output short-circuit duration
1)
Supply voltage (± 5 %)
Current consumption
5
>
500
≤
5
Advanced features
•
f
= 500 kHz
•
X
G
= ± 0.1 % (- 25°C .. + 70°C).
∞
± 15
30 +
V
OUT
/
R
L
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.
Accuracy - Dynamic performance data
X
G
V
O
f
t
r
Overall accuracy @
I
PN
Offset voltage @
I
P
= 0
- 25°C .. + 70°C
T
A
= 25°C
- 25°C .. + 70°C
± 0.1
Max
± 0.4
± 0.6
DC .. 500
<1
%
mV
mV
kHz
µs
Frequency bandwidth (- 3 dB) @ 10 % of
I
PN
Response time
Applications
•
AC variable speed drives and servo
General data
T
A
T
S
m
Ambient operating temperature
Ambient storage temperature
Mass
Standards
- 25 .. + 70
°C
- 40 .. + 85
°C
670
g
EN 50178 : 1996
•
•
•
•
•
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.
Application domain
•
Industrial.
Page 1/3
060927/0
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
w w w .lem.com
Current Transducer CT 5 .. 25-T
Isolation characteristics
V
d
V
W
dCp
dCl
CTI
R.m.s. voltage for AC isolation test, 50/60 Hz, 1 mn
Impulse withstand voltage 1.2/50 µs
6
> 9.5
Min
104.5
104.5
225
kV
kV
Creepage distance
Clearance distance
Comparative Tracking Index (Group III b)
5)
mm
mm
Application examples
According to EN 50178 and IEC 61010-1 standards
and following conditions :
•
Over voltage category OV 3
•
Pollution degree PD2
•
Non-uniform field
EN 50178
dCp, dCI,
V
W
Single isolation
Reinforced isolation
Rated isolation voltage
1000 V
600 V
IEC 61010-1
Nominal voltage
1000 V
600 V
Note :
5)
Between M5 screws and M5.
Safety
This transducer must be used in electric/electronic equipment with respect to
applicable standards and safety requirements in accordance with the manufacturer's
operating instructions.
Caution, risk of electrical shock
When operating the transducer, certain parts of the module can carry hazardous
voltage (eg. primary busbar, power supply).
Ignoring this warning can lead to injury and/or cause serious damage.
This transducer is a built-in device, whose conducting parts must be inaccessible
after installation.
A protective housing or additional shield could be used.
Main supply must be able to be disconnected.
Page 2/3
060927/0
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
w w w .lem.com
Dimensions CT 5 .. 25-T
Front view
(in mm. 1 mm = 0.0394 inch)
Left view
Connection
Top view
Mechanical characteristics
•
General tolerance
•
Transducer fastening
•
Connection of primary
•
Connection of secondary
•
Fastening torque
± 0.3 mm
2 holes M5 screws
2 steel screws M5
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.
Page 3/3
060927/0
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
w w w .lem.com
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