LEM CT25-T Current transducers ct 25-t Datasheet

IPN
Current Transducer CT 25-T
=
25 A
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).
Preliminary
Electrical data
IP N
IP
VO U T
KN
RL
CL
tC
VC
IC
Vd
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
25
0 .. ± 37.5
5
25 A / 5 V
> 500
≤5
∞
± 15
90 + VOUT / RL
6
A
A
V
•Insulated plastic case recognized
according to UL 94-V0
•Patent pending.
Advanced features
•f = 500 kHz
•X G = ± 0.1 % (- 25°C .. + 70°C).
Overall accuracy @ I PN
- 25°C .. + 70°C
Advantages
± 0.1
Typ
VO
Offset voltage @ I P = 0
f
Frequency bandwidth (- 3 dB) @ 10 % of I PN
TA = 25°C
- 25°C .. + 70°C
%
Max
± 0.4
± 0.6
DC .. 500
mV
mV
kHz
Ambient operating temperature
Ambient storage temperature
Mass
Standards 2)
•Excellent accuracy
•Very good linearity
•Low temperature drift
•Optimized response time
•Wide frequency bandwidth
•No insertion losses
•High immunity to external
interference
General data
TA
TS
m
•Closed loop (compensated) current
transducer
Ω
nF
s
V
mA
kV
Accuracy - Dynamic performance data
XG
Features
•Current overload capability.
- 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.
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.
LEM Components
980814/5
w w w .lem.com
Dimensions CT 25-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
Remarks
± 0.3 mm
2 x M5 screws
M5 threaded studs
M5 threaded studs
2.2 Nm or 1.62 Lb - Ft
•VOUT is positive when IP flows in the direction of the arrow.
•This transducer induces into the primary circuit a square
wave of 14 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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