Transformer & Switchgear
Off-line Testing

Digital Transformer Ratiometer - Model DXR-2000C™
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Slideshow

The Digital Transformer Ratiometer is designed to measure the no-load ratio of transformers at flux densities low enough that the impedance drop resulting from exciting current may be ignored. Accordingly, the voltage ratio obtained will be a precise measure of turns ratio.

Digital Transformer Ratiometer DXR-2000C
Features
  • A light weight instrument for the precise determination of transformer ratios, polarity, and excitation current
  • An important tool for preventive maintenance, production testing and commissioning on all transformers
  • Built-in vector matrix for 3 phase testing - an important feature for diagnostic work

The ultra precision potential measuring and ratio calculation provides a five digit readout with ± 0.05% accuracy.

Polarity indicator signals relative phasing at all times, while the LCD digital ammeter warns of saturation or shorted turns.

The 3-phase vector switch pack incorporates a convenient push-button switching arrangement which enables the operator to hook up the test lead harness to all terminals of a three-phase transformer in one operation, then proceed to test all phases on every tap setting without interruption or change of leads on terminals. The operator has full control over the test to select or short phases.

Zig-zag transformers, or transformers without an accessible neutral connection, can also be tested with no external shorting.