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Digital Voltage Transducer family
DV from 1200 to 4200 VRMS
DVL from 50 to 2000 VRMS
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DVL transducer versus DV
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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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
DVL: the improvements
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DVL transducer
Input terminals Output connecter
Input Output terminals
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DVL transducer
Input output cable Other output on request
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DVL Technology
ΣΔ modulator Manchester
encoder
PRIMARY SIDE
0 + primary side
supplies
+HV
Rectifier & regulator &
filter
-HV U to I converter
Decoder & Digital filter
Micro-controller &
DA converter
Voltage regulator
+V -V
- + secondary side
supplies
SECONDARY SIDE
0
M
Rectifier & filter
• 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.
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DVL Technology
ΣΔ modulator Manchester
encoder
PRIMARY SIDE
0 + primary side
supplies
+HV
Rectifier & regulator &
filter
-HV U to I converter
Decoder & Digital filter
Micro-controller &
DA converter
Voltage regulator
+V -V
- + secondary side
supplies
SECONDARY SIDE
0
M
Rectifier & filter
• On the secondary side the bit-stream is decoded, filtered and transmitted to the micro-controller 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 foreseen if needed.
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DVL Technology
ΣΔ modulator Manchester
encoder
PRIMARY SIDE
0 + primary side
supplies
+HV
Rectifier & regulator &
filter
-HV U to I converter
Decoder & Digital filter
Micro-controller &
DA converter
Voltage regulator
+V -V
- + secondary side
supplies
SECONDARY SIDE
0
M
Rectifier & filter
• 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
Typical error of reading in temperature Typical linearity error
• Accurate and stable in temperature
-3000 -2000 -1000 0 1000 2000 3000-0.06
-0.05
-0.04
-0.03
-0.02
-0.01
0
0.01
0.02
0.03
0.04
Vp (V)
Line
arity
erro
r (%
)
3000
2250
15001125
750
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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%200sec 500sec 50sec 60sec 50sec
Low frequency common mode
perturbation level
< 8% after 100sec < 2.5% after 200sec < 5% after 100sec < 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/
1min12kV/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 LV 200-AW/2/SP75 CV 4-6000/SP4 OV 200 DV
61000-4-2 OKNot done
OK OK OK
61000-4-3 < 8% < 8%(10V/m, 1GHz)< 6% (10V/m,
1GHz)< 4 %(10V/m,
1GHz)< 1.5 % (20V/m,
2.5GHz)
61000-4-4 < 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 doneNot done 60 dBuV/m 47 dBuV/m
55011 radiated emmission
35 dBuV/m Not done Not done 40 dBuV/m 39.6 dBuV/m
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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%60sec 30sec 60sec Not done
Low frequency common mode
perturbation level
< 3% after 50sec < 2.5% after 40sec < 3% during dv/dt Not done
Bandwidth –3dB
8.000 hertz 11.000 hertz 12.000 hertz Not done
Isolation voltage level
12kV/50hz/
1min6.5kV/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 usOK 5kHZ and
100 kHz3%/ 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/mNot done
44 dBuV/m Not done
55011 radiated emmission
35 dBuV/m Not done 47 dBuV/m Not done