MSRZ(S)-20AS Dual-Channel Winding Resistance Tester (for Temperature Rise/Thermal Run Tests)

Measuring the DC resistance of transformer windings is a mandatory requirement during various stages—including semi-finished and finished product factory testing, installation, handover testing, and preventive maintenance by power utilities. It effectively detects manufacturing defects (such as material selection issues, welding faults, loose connections, missing strands, or broken wires) and identifies potential hazards that may arise 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 automates self-checks, data processing, and display functions, and includes automatic discharge capabilities with clear discharge indicators. It delivers high measurement accuracy and ease of use, enabling rapid DC resistance testing.
The MSRZ(S)-20AS Dual-Channel Winding Resistance Tester is specifically designed for temperature rise measurements on large three-limb, 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 high voltage capabilities.
2. Dual-channel measurement: simultaneously measures two resistance values.
3. Comprehensive protection circuitry ensures high reliability.
4. Horizontal structure facilitates on-site operation at transformer manufacturing plants.
5. Audible discharge alarm and clear discharge indication minimize the risk of operational errors. Technical Specifications
Output Current: <15mA, 1A, 2.5A, 5A, 10A, 20A, 15mA+1A, 15mA+2.5A, 15mA+5A, 15mA+10A
Measurement Range: 200μΩ–2Ω (20A)
400μΩ–4Ω (10A)
800μΩ–8Ω (5A)
       2mΩ–16Ω (2.5A)
4mΩ–40Ω (1A)
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 13 meters (customizable length available)