Digital Voltage Transducer
family
DVL from
50 to 2000 VRMS
DV from
1200 to 4200 VRMS
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DVL transducer versus DV
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New design based on DV technology
Modularity concept (input and output connections)
Reduced input voltage and isolation
More compact same dimensions as AV 100, same footprint as LV 100
Much larger quantities than DV
Will complete LEM family of voltage transducers
Improved technology (technical risk is reduced)
Solution to reduce cost (simplified electronic, worst accuracy than DV,
but better than AV and LV, simplification of insulation, production in
China, higher quantities …)
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DVL: the improvements
 Very good accuracy and stable in temperature
 Partial discharge extinction voltage of 2.7 kV compatible with
permanent DC voltages up to 2 kV
 Low power consumption and losses
 High immunity to fast common mode voltage changes (several kV/s)
 Very low sensitivity to electro magnetic disturbances
 Insensitive to magnetic fields
 Low output noise
 Input voltage from 50V to 2000V
 Output current available: ±50mA or 4 to 10mA
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DVL transducer
Input Output
terminals
Input terminals
Output connecter
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DVL transducer
Input output cable
Other output on
request
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DVL Technology
+V
R e c tifie r &
re g u la to r &
filte r
0
V o lta g e
re g u la to r
R e c tifie r &
filte r
+
ΣΔ
m o d u la to r
-H V
M a n c h e s te r
encoder
D ecoder &
D ig ita l filte r
0
P R IM A R Y S ID E
•
•
•
-
+
s e c o n d a ry s id e
s u p p lie s
p rim a ry s id e
s u p p lie s
+H V
-V
M ic ro c o n tro lle r &
D A c o n ve rte r
M
U to I
c o n ve rte r
S E C O N D A R Y S ID E
The primary high input voltage is divided using 2 high voltage dividers, able to withstand
high dv/dt and having a low thermal drift.
A sigma-delta modulator on the primary side converts this analog value to a serial digital
signal (bit-stream and clock are encoded together), that allows to transmit data via one
single isolated channel (10MHz).
Digital data transmission is isolated by a transformer to provide insulation characteristic.
6
DVL Technology
+V
R e c tifie r &
re g u la to r &
filte r
0
V o lta g e
re g u la to r
R e c tifie r &
filte r
+
ΣΔ
m o d u la to r
-H V
M a n c h e s te r
encoder
D ecoder &
D ig ita l filte r
0
P R IM A R Y S ID E
•
•
•
•
-
+
s e c o n d a ry s id e
s u p p lie s
p rim a ry s id e
s u p p lie s
+H V
-V
M ic ro c o n tro lle r &
D A c o n ve rte r
U to I
c o n ve rte r
S E C O N D A R Y S ID E
On the secondary side the bit-stream is decoded, filtered and transmitted to the microcontroller by a digital filter.
A micro-controller transfers data from the digital filter to a 12 bits DA converter, the transfer
time is around 7 μs, this define the response time and the bandwidth of the transducer.
Once the micro-controller in place, it is also use for offset and gain adjustment during
production.
Analog output voltage from DA is then filtered and converted into a current (75 mA full
scale) using a current generator protected against short circuits. A voltage output is also
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foreseen if needed.
M
DVL Technology
+V
R e c tifie r &
re g u la to r &
filte r
0
V o lta g e
re g u la to r
R e c tifie r &
filte r
+
ΣΔ
m o d u la to r
-H V
M a n c h e s te r
encoder
D ecoder &
D ig ita l filte r
0
P R IM A R Y S ID E
•
•
-
+
s e c o n d a ry s id e
s u p p lie s
p rim a ry s id e
s u p p lie s
+H V
-V
M ic ro c o n tro lle r &
D A c o n ve rte r
M
U to I
c o n ve rte r
S E C O N D A R Y S ID E
A DC/DC converter connected to customer supply provide different supply voltages for the
secondary side, primary side is supplied through an other isolated transformer having the
same principle than the one use for data transmission.
Using an innovative design, these 2 isolated transformers guarantee insulation and partial
discharge level for voltage application up to 2000V, and their low parasitic capacitance
reduce the effect of dynamic common mode.
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DVL typical performance
• Accurate and stable in temperature
0.04
0.03
0.02
Linearity error (%)
0.01
0
-0.01
-0.02
-0.03
3000
2250
1500
1125
750
-0.04
-0.05
-0.06
-3000
Typical error of reading in temperature
-2000
-1000
0
Vp (V)
1000
2000
3000
Typical linearity error
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DVL: Main Characteristics
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DVL: Main Characteristics
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DVL: Main Characteristics
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DVL: Main Characteristics
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Voltage transducers comparison
Voltage
sensors
LV 100-4000/SP15
LV 200-AW/2/SP75
CV 4-6000/SP4
OV 200
DV
Overall
accuracy
(-40 to +85°C)
2.7%
2.5%
1%
1.5%
1%
Response time
at 90%
200sec
500sec
50sec
60sec
50sec
Low frequency
common mode
perturbation
level
< 8% after 100sec
< 2.5% after 200sec
< 5% after 100sec
< 5% after 10 sec
< 3% during dv/dt
Bandwidth
–3dB
4.000 hertz
1.200 hertz
8.000 hertz
14.000 hertz
12.000 hertz
Isolation
voltage level
12kV/50hz/
1min
12kV/50hz/1min
13.4kV/50hz/
1min
14kV/50hz/
1min
18.5kV/50hz/
1min
Partial
discharge level
2 kV
4.8 kV
4.6 kV
5 kV
5 kV
Consumption
on ±24V
30 mA
30 mA
50 mA
120 mA
20 mA
Noise level
< 0.01%
< 0.01%
0.2%
0.06%
0.02%
Thickness (mm)
99
117.5
78
90
54
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Voltage transducers comparison
Voltage
sensors
LV 100-4000/SP15
61000-4-2
OK
61000-4-3
< 8%
61000-4-4
CV 4-6000/SP4
OV 200
DV
OK
OK
OK
< 8%(10V/m, 1GHz)
< 6% (10V/m,
1GHz)
< 4 %(10V/m,
1GHz)
< 1.5 % (20V/m,
2.5GHz)
< 200 us
Not done
< 1.8us
< 8us
< 10us
61000-4-5
OK
Not done
OK
OK
OK
61000-4-6
4 mA
Not done
1.12mA
0.22 mA
0.38 mA
61000-4-8
< 45uA
Not done
< 150uA
< 0.1 uA
< 0.1 uA
55011
conducted
emmission
Not done
Not done
Not done
60 dBuV/m
47 dBuV/m
35 dBuV/m
Not done
Not done
40 dBuV/m
39.6 dBuV/m
55011 radiated
emmission
LV 200-AW/2/SP75
Not done
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Voltage transducers comparison
Voltage
sensors
LV 100-2000/SP12
AV 100-2000
DVL
LV 25 1000
Overall
accuracy
(-40 to +85°C)
3%
1.7%
1.5%
2.6%
Response time
at 90%
60sec
30sec
60sec
Not done
Low frequency
common mode
perturbation
level
< 3% after 50sec
< 2.5% after 40sec
< 3% during dv/dt
Not done
Bandwidth
–3dB
8.000 hertz
11.000 hertz
12.000 hertz
Not done
Isolation
voltage level
12kV/50hz/
1min
6.5kV/50hz/1min
8.5kV/50hz/
1min
4.1kV/50hz/
1min
Partial
discharge level
2 kV
2.2 kV
2.7 kV
Not done
Consumption
on ±24V
40 mA
30 mA
20 mA
20 mA
Noise level
< 0.004%
< 0.2%
0.02%
Not done
MTBF (h)
4 646 698
IEC 62380
2 761 894
IEC 62380
1 883 371
IEC 62380
885 739
HDBK 217
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Voltage transducers comparison
Voltage
sensors
LV 100-4000/SP15
AV 100-2000
DVL (investigation)
LV 25 1000
61000-4-2
OK
OK
OK
OK
61000-4-3
2.1%
1.8%
0.5%
1%
(10V/m, 1GHz)
61000-4-4
3% / 70 us
2% / 30 us
OK 5kHZ and
100 kHz
3%/ 5us
61000-4-5
OK
OK
OK
OK
61000-4-6
8%
0.6%
0.2%
2.2%
61000-4-8
< 1%
0.2%
< 0.1%
<1%
55011
conducted
emmission
25 dBuV/m
44 dBuV/m
Not done
55011 radiated
emmission
35 dBuV/m
47 dBuV/m
Not done
Not done
Not done
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