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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