MSRZ(S)-40AS Dual-Channel Winding Resistance Tester (for Temperature Rise/Thermal Run Tests)

Measuring the DC resistance of transformer windings is a mandatory procedure during manufacturing (for both semi-finished and finished products), factory acceptance testing, installation, handover testing, and preventive maintenance by power utilities. It effectively detects manufacturing defects—such as issues with material selection, welding, loose connections, missing strands, or broken wires—as well as potential hazards that may develop during operation. To meet the need for rapid DC resistance measurement, this instrument utilizes advanced power supply technology, offering a compact, lightweight design and high output current capabilities. Controlled by a microcontroller, the unit automatically performs self-checks, data processing, and display functions, and includes automatic discharge capabilities with clear discharge indicators. It offers high measurement accuracy and ease of use, enabling rapid DC resistance testing.
The MSRZ(S)-40AS Dual-Channel Winding Resistance Tester is specifically designed for temperature rise measurements on large three-core, five-limb transformers. With rapid charging and measurement speeds, it meets the strict timing requirements of temperature rise tests. Its dual-channel measurement, real-time sampling, and printout capabilities simplify the temperature rise testing process.
Performance Features
1. High output current and voltage.
2. Dual-channel measurement capability, allowing simultaneous measurement of two resistance values.
3. Comprehensive protection circuitry ensuring high reliability.
4. Horizontal structure, facilitating on-site operation at transformer manufacturing plants.
5. Audible discharge alarm and clear discharge indication to minimize operational errors. Technical Specifications
Output Current: <15mA, 2.5A, 5A, 10A, 20A, 40A
Measurement Range: 100μΩ–500mΩ (40A)
400μΩ–1Ω (20A)

200μΩ–4Ω (10A)
1mΩ–8Ω (5A)
       2mΩ–16Ω (2.5A)
10Ω–20kΩ (<15mA)
Accuracy: ±(0.2% + 2 digits)
Resolution: 0.1μΩ
Operating Temperature: 0–40°C
Ambient Humidity: ≤90% RH, non-condensing
Power Supply: AC 220V ±10%, 50Hz ±1Hz
Dimensions: 448 × 463 × 177 (mm)
Net Weight: 15 kg
Test Lead Length: Standard 13m (customizable length available)