Handheld Turns Ratio Tester  – Overview

The TRT-H is a battery operated, handheld, fully automatic test set designed for turns ratio, excitation current and phase shift measurements of transformers. The transformer turns ratio is determined by applying AC voltage across high-voltage winding, accurately measuring AC voltage across the corresponding unloaded transformer winding, and then displaying the ratio of these voltages. The user can enter a transformer’s nameplate voltages, so that the turns ratio deviation can be calculated. This feature eliminates any error otherwise caused by an operator’s manual calculation. It compares measured turns ratio with the nameplate ratio and prints out the % of error for each test. Applications include: Turns ratio measurement of distribution transformers; Turns ratio verification of instrument transformers; Turns ratio deviation calculation; Excitation current measurement of distribution and instrument transformers; Phase angle measurement of distribution and instrument transformers; and Polarity check of instrument transformers.

Handheld Turns Ratio Tester – Features

• Unique handheld instrument
• Extremely lightweight – only 1.4 kg / 3.1 lbs
• Measures 3 transformer parameters:
  • Turns ratio
  • Excitation current
  • Phase angle
• Single-phase test voltage up to 40 V AC
• Turns ratio accuracy up to ±0.1%
• Battery-powered
• Tests single-phase and three-phase transformers