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Omicron CT Analyzer with CT SB2 Switch Box: Current Transformer Testing


How CT Analyzer works:

  • Injects low test signals into secondary side of the CT
  • Determines the CT‘s equivalent circuit parameters
  • Identifies all relevant CT performance parameters
  • Displays all relevant parameters of the CT and its accuracy at different currents and burdens
  • Evaluates the CT according to the selected standard
  • Determines unknown CT nameplate parameters
  • Demagnetizes the CT after the test.

More Information

Analyze your current transformer (CT) with the push of a button with the Omicron CT Analyzer and CT SB2 Switch Box

Range of measurements:

  • Ratio and phase accuracy
  • Winding resistance
  • Excitation characteristics (knee points)
  • Composite error (ALF, ALFi, FS, FSi, Vb)
  • Burden impedance
  • Transient CT classes and parameters (TPS, TPX, TPY and TPZ type CTs)
  • Transient dimensioning factor (Ktd)
  • If missing/unknown: CT type, class, ratio, knee point, power factor, nominal burden, operating burden, primary and secondary winding resistance
  • Remanence and residual magnetism
  • Immediate good/bad evaluation

Additional features:

  • Simulate different burdens and currents
  • Analyze the effect of CT saturation
  • Measure VT ratio
  • Multimeter

Key features

  • Highest measurement accuracy: 0.02 % / 1 min when calibrating on site
  • Very small and lightweight (< 8 kg / 17.4 lbs), easy to transport for on-site testing
  • Automatic evaluation according to IEC, IEEE and to customized or local/national standards
  • Short commissioning times (duration of the automatic test < 1min)
  • Excellent workplace safety – Tests run at max. 120 V
  • Integration into testing routines using Remote Interface Control

Includes the Omicron CT SB2 Switch Box. A powerful combination.

The CT SB2 switch box is an accessory for the CT Analyzer which allows automatic testing of multi-ratio current transformers. It is connected to all taps of the current transformer and to the CT Analyzer. This allows the transformer ratios of all winding combinations to be automatically tested with the CT Analyzer. The CT SB2 can either be positioned next to the CT Analyzer or directly attached to it. With a combined weight of 11 kg, this testing system is easily portable and ideally suited to mobile, on-site use.

Key features

  • Up to six connections for the secondary side of the current transformer
  • Automatic check to ensure correct wiring
  • Separate connections for primary resistance measurement and measurement of the secondary burden
  • Fully automated testing with no need for rewiring


  • Testing multi-ratio current transformers


Equipment Specifications

Additional information

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