AC/DC High Voltage Transducer

AC/DC high voltage transducers for true rms measurement Input voltages up to V_in = 3600 V AC

The VariTrans P 42000 TRMS isolation amplifiers have been specially conceived for measuring high voltages up to 3600 V AC/DC. They reliably isolate high potentials at the input circuit. Thanks to the true rms conversion in the transducer, even distorted input signals are captured correctly and output as so-called true rms values.
The isolating distances are designed to withstand permanent voltages up to 3600 V AC/DC and fast transients up to 20 kV.

Facts and Features

• Universal usability:
  • AC input 60 mV~ up to 3600 V~ as well as 100 mA~ up to 5 A~
  • DC output 0 (4) ... 20 mA, 0 ... 10 V
• New TransShield technology
  enables extremely compact modular housings
• Working voltages up to 3600 V AC/DC
• Protection against electric shock
  with protective separation up to 1800 V AC/DC according to EN 61140
• Test voltages up to 15 kV AC
• Excellent transmission properties:
  • Gain error Crest factor ≤ 3     < 0.5 %
  • Gain error Crest factor 3 ... 5  < 1 %
  • Response time T₉₀                 <  150 ms
    More
• Virtually no influence from common-mode voltages: CMRR approx. 150 dB
• Tremendous flexibility provided by
  • Calibrated switching of up to 16 input/output ranges
  • up to 16 customer-specific measuring ranges
  • VariPower 20 V to 253 V AC/DC broad-range power supply
• Reliable function even with unstable supply
• No damage in the case of erroneous power connection
• Switchable models
  minimize required device variants and save stockkeeping costs
• Robust thanks to vacuum encapsulation
• Mechanically stable
  for operation on ships, rail vehicles and land crafts
• 5-year warranty

The Task
In electrical systems, alternating currents from 10 V to 3600 V need to be recorded, galvanically isolated and converted into standard 0...20 mA, 0...10 V or 4 ... 20 mA output signals.  The DC output signal should reflect the rms values of the input voltage.

The Problems
The alternating voltages which are used are not always sinusoidal, but sometimes distorted. But typical AC/DC transducers are only designed for sinusoidal sources. With input signals which are not sinusoidal, they exhibit – sometimes considerable – errors in forming the rms value, which can be severe enough to render the measurement values unusable. Therefore true rms measurement is required for signals which are non-sinusoidal and/or are distorted.

In the case of insufficient insulation, high voltages and harsh ambient conditions may overload the galvanic isolation. This can result in false measurement values or even personal injury or damage to the equipment. These risks have to be eliminated safely and over the long term by suitably designed high voltage transducers.

The Solution
The VariTrans P 42000 TRMS high voltage transducers have been specially conceived for measuring high voltages up to 3600 V AC/DC. They reliably isolate high potentials at the input circuit. Thanks to the true rms conversion in the transducer, even distorted input signals are captured correctly and output as so-called true rms values. The isolating distances are designed for high working voltages up to 3600 V AC/DC and test voltages up to 15 kV. Protection against electric shock is achieved through protective separation up to 1800 V AC/DC across input and output and power supply according to EN 61140.