Raytech WR50-13 Transformer Winding Resistance Tester | 50 A, 3 measurement channels, 0.00 µΩ–100 kΩ, core demagnetization, IP67 (lid closed)

Raytech WR50-13 Transformer Winding Resistance Tester: 50 A, 3 Channels

Overview

The WR50-13 is a DC winding resistance tester from Raytech of Switzerland, designed for highly inductive windings such as large power transformers. It charges and discharges quickly and detects shorted turns, tap changer problems and loose connections. Using the supplied jumpers, current can be injected into the HV, LV and tertiary windings simultaneously, with three independent measurement channels measuring at the same time. It also offers advanced core demagnetization, automatic temperature correction with up to 3 temperature probes, and optional heat-run and cooling curve analysis (AHRT-01). The WR50-12 in the same series has 2 measurement channels; please inquire separately.

Key Specifications

• Test current and voltage: Selectable 25 mA–50 A; up to 50 VDC; max. output 1200 W
• Range and accuracy: 0.00 µΩ–100 kΩ; 30–50 A: up to 1.3 Ω, ±0.1% of reading ±0.05 µΩ; 0.1–0.3 A: up to 500 Ω, ±0.1% ±10 µΩ
• Channels: 3 resistance measurement channels; 3 temperature channels
• Inductive load: Fast charge and discharge up to 1500 H
• 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
• Power: 90–264 VAC, 47–63 Hz; max. 1500 VA
• Protection and environment: IP67 with lid closed; operating temperature -10 to 55 ℃
• Dimensions and weight: 525 × 437 × 213 mm; 16.6 kg

Applications

• Winding resistance, tap changer testing and demagnetization of large power transformers.
• Transformer factory testing, commissioning acceptance and preventive maintenance.

Specifications per the Raytech WR50-13 and WR50-12 product pages (raytech.ch, retrieved 2026-10-23).