transformer turns ratio testers

Single- and three-phase transformer turns ratio testers include the ATRT-01 S3, ATRT-01B S3, TRF-250, and TRF-250A, delivering automated, accurate measurements. Features include IEEE C57.12.90 compliance, multiple test voltages from 4VAC to 250VAC, wide ratio ranges, polarity and phase angle display, excitation current measurement, Bluetooth and USB interfaces, and an onboard thermal printer.

Product Overview

• Single- and three-phase transformer turns ratio testers with rugged, field-ready design.
• Fast, accurate, automated measurements per IEEE C57.12.90 for substation maintenance.
• Voltage selections from 4VAC to 250VAC; ratio range 0.8–50,000:1.
• Models ATRT-01-S3, ATRT-01B-S3, TRF-250, TRF-250A; Bluetooth, USB, and thermal printer.

ATRT-01-S3, ATRT-01B-S3, TRF-250, and TRF-250A deliver rapid, precise transformer turns ratio testing. They support IEEE C57.12.90, multiple test voltages from 4VAC to 250VAC, and ratio ranges up to 50,000:1, with polarity, phase angle, and excitation current measurements, Bluetooth and USB connectivity, and an integrated thermal printer. Rugged, field-ready construction on-site.

Target Market

Ideal for utility and industrial power teams, including substation maintenance technicians, commissioning engineers, transformer manufacturing QA inspectors, and field service crews. Suited to routine substation maintenance, commissioning tasks, and quality assurance, including transformers with high phase shift or deep tap positions under ANSI and IEC standards.