The Omicron CT Analyser is the optimal device for testing instrument transformers for billing purposes, as well as for testing protection transformers, including those with transient behavior. It is ideal for usage in the field due to its light weight of just 8 kg, high noise immunity and Automatic assessment according to IEEE and IEC standards. The CT Analyzer offers a wide range of measurements, such as CT-ratio and phase-angle accuracy with consideration of nominal and operational burden for various currents, CT winding resistance, CT excitation / saturation (unsaturated and saturated), ALF and FS (direct and indirect), burden impedance and CT residual magnetism within minutes with just one test cycle.

 Brief Specs:

• Automatic assessment according to IEC 60044-6, or IEEE C57.13 up to accuracy class ≥ 0.3
• Determination of ALF/ALFi and FS/FSi, Ts, and composite error for nominal and connected burden
• CT ratio and phase measurement with consideration of nominal and connected secondary burden
  • Currents from 1% up to 400 % of the rated value
  • Different burdens (full, ½, ¼, ⅛ burden)
• CT winding resistance measurement (primary and secondary)
• CT excitation curve (unsaturated and saturated)
  • Saturation characteristic recording
  • Direct comparison of excitation curve to a reference curve
• CT phase and polarity check
• Secondary burden measurement
• Automatic demagnetization of the CT after the test
• High level of safety using patented variable frequency method (max. 120 V)
• “Nameplate guesser” function for CTs with unknown data
• Remote control interface
• Simulation of measured data with different burdens and currents
• Knee-point voltage from 1 V up to 30 kV can be measured
• Automatic assessment for accuracy class > 0.1 (inclusive classes defined in the IEEE C57.13.6 standard)
• Measurement of transient behavior of TPS, TPX, TPY and TPZ type CTs
• Determination of the transient dimensioning factor (Ktd) Considering Duty (C-O / C-O-C-O) e.g. auto-reclosure system

The Vanguard EZCT10 is a microprocessor-based, current-transformer test set that measures excitation current, turns ratio and winding polarity on single and multi-ratio current transformers. Current transformers can be tested in their field-mounted configuration, eliminating the need to remove bushings or current transformers from the host equipment. The test set determines the current-transformer turns ratio by accurately measuring the voltages across the primary and secondary windings (a direct proportion) and then displaying the voltage ratio. Turns ratio is measured from 0.8 through 5,000 to 1.0 with an accuracy of 0.5% or better. Winding polarity displays as a + or – sign and is also annotated with the phase in degrees.

Brief Specs: