10/14/2026
Turns ratio and winding resistance are two different setups on most trucks. Two instruments, two sets of leads, and a reconnection in the middle of an outage window.
The DV Power TWR250B does both off one three-phase connection. Turns ratio at up to 250 V AC. Winding resistance at up to 25 A DC, ripple free. Demagnetization and magnetic balance run from the same setup. Tap changer DRM is available as an option.
Results print on the built-in thermal printer before the crew leaves site, or export to Excel through DV-TR.
Battery or mains. 10.1 inch touchscreen. Built-in tap changer control unit that tracks tap position through the test sequence from the starting position entered at setup.
Fewer connections, fewer retests.
DV Power TWR250B: https://www.progusa.net/transformer-winding-test