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CT/PT.404 Current & Protection Transformer Analyser

The CT/PT.404 is a professional Current & Protection Transformer Analyzer designed for complete accuracy testing of CTs and PTs in substations and power utility environments.
With DSP + FPGA architecture, automated test functions, and compatibility with IEC60044 & IEC61869 standards, it provides high-precision measurements including excitation/knee-point curves, ratio, polarity, burden, resistance, phase error, and transient characteristics.
The CT/PT.404 is lightweight, field-portable, and optimized for fast, single-connection transformer diagnostics.

Key Features

  • Tests CT excitation characteristics / knee point, ratio, polarity, phase error, burden, winding resistance, angular difference, transient characteristics

  • Supports all CT types: protection, measurement, TP class

  • Automatic measurement of ALF, FS, Ts, Kr, inductance (saturated & unsaturated)

  • Advanced frequency conversion technology allows knee-point voltages up to 60 kV using only a 180 V / 12 A output

  • Fully compliant with IEC60044-1, IEC60044-6, IEC61869-2:2012

  • Single-connection testing for DC resistance, excitation, polarity

  • Built-in printer + USB export

  • Stores 1000 groups of results

Technical Specifications

Electrical Performance

  • Output Voltage: 0–180 Vrms

  • Output Current: 12 A RMS, 36 A peak

  • Voltage accuracy: ±0.2%

CT Testing

  • CT Ratio Range: 1–40,000

  • Accuracy: 0.05% typical

  • Phase Range: 2 minutes; accuracy 0.5 minutes typical

  • Winding resistance test: 0–600 Ω

    • Accuracy: 0.5% ± 2 mΩ

  • Burden Range: 0–1000 VA

    • Accuracy: 0.5% ± 0.02 VA

PT Testing

  • PT Ratio Range: 1–35,000

  • Accuracy: 0.05% typical

General Specifications

  • Power Supply: AC 220 V ±10%, 50 Hz

  • Data Storage: 1000 groups

  • Operating Temperature: –10 °C to +50 °C

  • Humidity: ≤90%

  • Dimensions: 365 × 290 × 153 mm

  • Weight: ≈10 kg

Standard Accessories

  • Test leads (CT/PT connections)

  • USB cable

  • Power cable

  • Built-in thermal printer

  • Carry case

  • User manual

  • Calibration certificate

(Datasheet lists built-in features & storage; accessories inferred from standard CT/PT kits.)

Applications

  • CT excitation, ratio & polarity verification

  • PT ratio, polarity & resistance testing

  • Protection CT transient performance

  • Burden measurement for CT/PT circuits

  • IEC-compliant transformer diagnostics

Optional Add-Ons

  • Extended CT/PT test leads

  • External burden box

  • Ruggedized hard case

  • PC data analysis software (advanced)

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