Raytech WR14 Transformer Winding Resistance Tester | 15 A, 2 measurement channels, battery or mains, 0.00 µΩ–100 kΩ, 9.4 kg

Raytech WR14 Transformer Winding Resistance Tester: 15 A, Battery Powered

Overview

The WR14 is a DC winding resistance tester from Raytech of Switzerland, designed for highly inductive windings such as large power transformers and used to detect shorted turns, tap changer problems and loose connections. For field mobility it is battery powered and lightweight. Using the supplied jumpers, current can be injected into the HV and LV sides simultaneously, with two measurement channels measuring at the same time. It offers advanced core demagnetization, automatic temperature correction with up to 2 temperature probes, and optional cooling curve analysis (AHRT-01). The rack-mount WR14-R is available on request.

Key Specifications

• Test current and voltage: Selectable 25 mA–15 A; up to 30 VDC; max. output 90 W
• Range and accuracy: 0.00 µΩ–100 kΩ; 10–15 A: up to 1 Ω, ±0.1% of reading ±0.1 µΩ; 25–100 mA: up to 1200 Ω, ±0.1% ±20 µΩ
• Channels: 2 resistance measurement channels; 2 temperature channels
• Inductive load: Charge and discharge up to 1500 H
• Power: Li-ion battery 14.8 V / 6 Ah; or 90–264 VAC, 47–63 Hz
• Display and operation: 5.7-inch color touch LCD; mouse and keyboard supported
• Interfaces and storage: 2 × USB 2.0, RS232; 10,000 internal records; built-in 1.9-inch thermal printer; T-Base Pro software
• Protection and environment: IP67 with lid closed; operating temperature -10 to 55 ℃
• Dimensions and weight: 470 × 357 × 176 mm; 9.4 kg

Applications

• On-site transformer winding resistance measurement and demagnetization in substations.
• Transformer and motor winding measurement where no mains power is available.

Specifications per the Raytech WR14 product page (raytech.ch, retrieved 2026-10-23).