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DIR CT Polarity & Magnetization Tester

The DIR CT is a compact CT polarity and magnetization tester designed to determine the polarity and excitation characteristics of current transformers quickly and accurately. It provides DC or AC excitation with automatic polarity indication, ideal for commissioning, testing, and maintenance of protective relays and CT circuits in substations and power plants.

Key Features

  • Measures CT polarity, excitation, and demagnetization characteristics

  • Automatic polarity identification (dot marking)

  • Fast saturation curve plotting for CT verification

  • Built-in demagnetization function prevents CT distortion

  • Large, bright LCD for field visibility

  • Compact, battery-powered design

  • Built-in memory for up to 100 test results

  • USB interface for data transfer

Technical Specifications

Parameter Specification
Test Voltage Up to 120 V DC
Test Current Up to 5 A
Measurement Range 0–2000 Ω
Polarity Detection Automatic (Positive/Negative)
Display Backlit LCD
Memory 100 results
Communication USB
Power Supply Rechargeable Li-ion battery / AC adaptor
Operating Temperature –10 °C to +50 °C
Weight ≈ 3.5 kg

Standard Accessories

  • Test leads with clamps

  • Power adaptor

  • Carry case

  • USB cable

  • User manual & calibration certificate

Applications

  • CT polarity verification during commissioning

  • CT magnetization and demagnetization testing

  • CT excitation and saturation curve analysis

  • Substation maintenance and protection system validation

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