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VTRM-3A / VTRM-3B — 3-Phase Automatic Transformer Turns Ratio Meter

The VEER VTRM-3A and VTRM-3B are advanced 3-phase automatic transformer turns ratio meters designed for accurate no-load ratio testing of distribution and power transformers. Both models support Y-Y and D-Y configurations and automatically measure turns ratio, % deviation, excitation current, and HV/LV voltages with high stability and repeatability.

They feature a large LCD display, error-proof HV/LV hook-up detection, onboard storage for up to 200 test results, and PC connectivity for data transfer via RS-232/USB. The VTRM-3A offers a ratio range up to 200:1, while the VTRM-3B extends the range to 2000:1 for larger and more demanding transformer applications.

These instruments are ideal for transformer manufacturers, utility substations, maintenance contractors, and service centers requiring fast, dependable, and fully automated ratio testing.

Model Options

Key Features

  • 3-phase automatic transformer turns ratio testing

  • Supports Y-Y and D-Y vector group configurations

  • Large LCD display with clear ratio/deviation readout

  • Measures:
    • Turns Ratio
    • % Deviation
    • Excitation Current
    • HV & LV Voltages
    • Reverse Polarity

  • Built-in memory for 200 test results

  • PC communication via RS-232 & USB

  • Rugged, portable construction

  • Hook-up error indication for incorrect HV/LV connections

  • Optional dual test voltage (VTRM-3C style feature carried over from sheet)

Operating Overview

  • Test Voltage: 55 V @ 50 Hz (other ranges available on request)

  • Excitation Current Range: 200 mA (optional higher range available)

  • Resolution: 5 digits

  • Designed for production lines, service workshops, and field testing

  • Temperature tolerance suitable for outdoor/industrial environments

Applications

  • Transformer manufacturing QA

  • Substation commissioning and maintenance

  • Transformer repair & rewinding workshops

  • Utility and industrial maintenance teams

  • Training centers & testing laboratories

Model Options

VTRM-3A

  • Ratio Range: 1.0 – 200.0

  • Connection Types: Y-Y, D-Y

  • Ideal for small to medium transformers

VTRM-3B

  • Ratio Range: 1.0 – 2000.0

  • Connection Types: Y-Y, D-Y

  • Suitable for larger or higher-ratio transformers

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