Battery Operated Transformer Ratio Meter – Overview

The Battery-Operated Transformer Ratio Meter PWR1-3B is a battery-powered instrument that can also be driven by normal line voltage. It is designed to measure transformation ratio, phase error, and magnetizing current of power and distribution transformers for all three-phases simultaneously. Voltage and current transformers are single-phase, power transformers normally are three-phase. Due to the bad quality of industrial lines (phase jitter and shifting, voltage differences between the three phases) all measurements normally are done in single-phase, even on three-phase ratiometers. The design of the PWR1-3B contains an internal sinus power oscillator which delivers the necessary exciting voltage with very low distortion and stable voltage not found in industrial lines. This allows for very stable and precise single and three-phase measurements. The Battery-Operated Transformer Ratio Meter uses a large LCD display with a backlight to present the values of ratio and phase difference of “H.V. Winding” to “L.V. Winding”, and the excitation voltage and the magnetizing current of the high voltage winding. Additionally, the instrument performs self-calibration and has different warning messages before each measurement in case of reversed connections and other failures.

Battery Operated Transformer Ratio Meter – Features

• Ratio range from 8 to 2,500
• Fully automated measurement
• Measuring voltage 10 V / 100 V selectable
• The display shows:
  • Ratio
  • Phase-angle
  • Excitation voltage
  • Magnetizing current
• Easy to read large LC display for all three-phases with backlight
• Built-in printer (optional)
• A robust mobile case for field use

Datasheet