T&D World Magazine

CT Analyzer Approved for Calibration

The German National Metrology Institute (Physikalisch-Technische Bundesanstalt/PTB) located in Braunschweig and Berlin has approved the Omicron's CT Analyzer for on-site measurements of current transformers with an accuracy class of >= 0.2 which are in line with the legal calibration standards.

The CT Analyzer is a lightweight instrument designed to meet high standards for performing excitation, ratio, polarity and winding resistance tests on current transformers (CTs) as well as burden-impedance measurement.

The instrument offers fast, comprehensive testing and calibration of current transformers, for protection and metering engineers as well as CT and switchgear manufacturers.

Features include:

  • Reduced commissioning time due to fully automatic testing.
  • Allows testing and result assessment according to IEC 60044-1, IEC 60044-6 or IEEE C57.13 (ANSI standard).
  • Accuracy level (0.02 %/1 min.) enables field calibration and verification of class 0.1 CTs for metering.
  • Testing and automated assessment of specialized CTs such as TPS, TPX, TPY and TPZ.
  • Allows testing of CTs for power frequencies from 16,7 to 400 Hz.
  • Automatic analysis of CTs with unknown data ("name plate guesser" function).
  • Recalculation of test results after tests with different burden and different primary current (no further on-site measurements).
  • High level of safety - all tests utilize low voltages (120V)
    European Patent EP 1 398 644 A1.
  • Almost unlimited in: Ratio (50 000 : 1), Primary current (999 000A max.),
    Knee point voltage (15kV max.).
  • Automatic demagnetization of the CT after the test.
  • Data storage on a removable Compact Flash (CF) card, which can be read by any standard memory card reader.
  • Remote interface to integrate CT Analyzer into an automatic production process.
  • Customizable reporting within Microsoft Excel.
  • Easy importing and editing into MS Office standard software.
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