PHENIX Home / Transformer Turns Ratio Testers

Single Phase TTRs

Vanguard’s fourth-generation, micro-processor-based, single-phase, automatic transformer turns-ratio tester delivers fast, accurate TTR measurements in a rugged, field-ready format. The ATRT-01 S3 uses the IEEE C57.12.90 measuring method to determine the transformer turns ratio, whereby its measuring circuitry self-adjusts before each measurement to ensure turns-ratio accuracy. Two selectable test voltages, 4VAC and 40VAC, offer flexibility in testing different transformers. The ATRT-01B S3 is battery or AC-powered. The unit can be used continuously for up to 4 hours of power charge, and while charging.

KEY FEATURES

  • Standalone or computer-controlled

  • Displays turns-ratio from 0.8 - 15,000

  • Calculates turns-ratio percentage error

  • Displays winding polarity and phase angle

  • Displays excitation current

MODELS

  • ATRT-01-S3 - Single Phase - 4VAC or 40VAC

  • ATRT-01B-S3 - Single Phase - AC or Internal Battery

PHENIX Home / Transformer Turns Ratio Testers

Three Phase TTRs

The Vanguard TRF-250A is a high-performance, three-phase transformer turns ratio tester engineered for fast, accurate, and automated testing of power and distribution transformers. With a test voltage of up to 250V and true three-phase excitation, the TRF-250A ensures precise ratio, phase angle, and excitation current measurements, even on transformers with high phase shift or deep tap positions.

KEY FEATURES

  • Ratio range: 0.8 – 50,000:1

  • Capable of detecting 130 different 3-phase transformer types defined by ANSI and IEC standards

  • 4VAC, 40VAC, 100VAC, and 250VAC voltage selections

  • Phase angle and excitation current measurement

  • Bluetooth and USB PC interfaces

  • 4.5” wide thermal printer

MODELS

  • TRF-250 - Three-Phase - 4VAC up to 250VAC

  • TRF-250A - Three-Phase - AC or Internal Battery

Contact Us

To inquire about any of our products or services, current promos, book a demo/test unit, or inquire about an upcoming webinar, simply fill out the following request form and one of our PSI Associates will get back to you quickly!

T 905.995.4990

Sales
mark@psiinc.ca

Support/Repairs
service@psiinc.ca