Voltage Transducer LV 100
For the electronic measurement of voltages : DC, AC, pulsed...,
with a galvanic isolation between the primary circuit (high voltage)
and the secondary circuit (electronic circuit).
I
PN
= 10 mA
V
PN
= 100 .. 2500 V
Electrical data
I
PN
I
P
R
M
Primary nominal r.m.s. current
Primary current, measuring range
Measuring resistance
with ± 15 V
I
SN
K
N
V
C
I
C
V
d
@ ± 10 mA
@ ± 20 mA
max
max
10
mA
0 .. ± 20
mA
R
M min
R
M max
0
0
150
50
Ω
Ω
mA
V
mA
kV
Features
•
Closed loop (compensated) voltage
transducer using the Hall effect
•
Insulated plastic case recognized
according to UL 94-V0.
Secondary nominal r.m.s. current
Conversion ratio
Supply voltage (± 5 %)
Current consumption
R.m.s. voltage for AC isolation test
1)
, 50 Hz, 1 mn
50
10000 : 2000
± 15
10 +
I
S
6
Principle of use
•
For voltage measurements, a current
proportional to the measured voltage
must be passed through an external
resistor
R
1
which is selected by the
user and installed in series with the
primary circuit of the transducer.
Accuracy - Dynamic performance data
X
G
ε
L
Overall Accuracy @
I
PN
,
T
A
= 25°C
Linearity
Offset current @
I
P
= 0,
T
A
= 25°C
Thermal drift of
I
O
Response time
2)
@ 90 % of
V
P max
± 0.7
< 0.1
Typ
Max
± 0.2
± 0.3
%
%
mA
mA
µs
Advantages
•
Excellent accuracy
•
Very good linearity
•
Low thermal drift
•
Low response time
•
High bandwidth
•
High immunity to external
interference
•
Low disturbance in common mode.
I
O
I
OT
t
r
0°C .. + 70°C
± 0.2
20 .. 100
General data
T
A
T
S
R
P
R
S
m
Ambient operating temperature
Ambient storage temperature
Primary coil resistance @
T
A
= 70°C
Secondary coil resistance @
T
A
= 70°C
Mass
Standards
3)
0 .. + 70
- 25 .. + 85
1900
60
460
EN 50178
°C
°C
Ω
Ω
g
Applications
•
AC variable speed drives and servo
motor drives
•
Static converters for DC motor drives
•
Battery supplied applications
•
Uninterruptible Power Supplies
(UPS)
•
Power supplies for welding
applications.
Notes :
1)
2)
3)
Between primary and secondary
R
1
= 100 kΩ (L/R constant, produced by the resistance and inductance
of the primary circuit)
A list of corresponding tests is available
980709/5
LEM Components
w w w .lem.com
Dimensions LV 100
Front view
(in mm. 1 mm = 0.0394 inch)
Left view
Secondary terminals
Terminal + : supply voltage + 15 V
Terminal M : measure
Terminal - : supply voltage - 15 V
Connection
Top view
Mechanical characteristics
•
General tolerance
•
Fastening
•
Connection of primary
Fastening torque
•
Connection of secondary
± 0.3 mm
2 holes
∅
6.5 mm
M5 screw terminals
2.2 Nm or 1.62 Lb - Ft.
Faston 6.3 x 0.8 mm
Remarks
•
I
S
is positive when
V
P
is applied on terminal +HT.
•
This is a standard model. For different versions (supply
voltages, turns ratios, unidirectional measurements...),
please contact us.
Instructions for use of the voltage transducer model LV 100
Primary resistor
R
1
: the transducer’ optimum accuracy is obtained at the nominal primary current. As far as possible,
R
1
should be
s
calculated so that the nominal voltage to be measured corresponds to a primary current of 10 mA.
Example: Voltage to be measured
V
PN
= 1000 V
a)
R
1
= 100 kΩ /40 W,
I
P
= 10 mA
b)
R
1
= 400 kΩ / 5 W,
I
P
= 2.5 mA
Accuracy = ± 0.7 % of
V
PN
(@
T
A
= +25°C)
Accuracy = ± 2.5 % of
V
PN
(@
T
A
= +25°C)
Operating range (recommended) : taking into account the resistance of the primary windings (which must remain low compared to
R
1,
in order
to keep thermal deviation as low as possible) and the isolation, this transducer is suitable for measuring nominal voltages from 100 to 2500 V.
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
stm32/stm8
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