MSRZ(S)-10AS Dual-Channel Winding Resistance Tester

(for temperature rise and heat-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, the instrument utilizes advanced power supply technology, offering a compact, lightweight design and high output current. Controlled by a microcontroller, the unit automates self-checks, data processing, and display functions, and includes automatic discharge capabilities with clear discharge indication. The instrument offers high measurement accuracy and ease of use, enabling rapid DC resistance testing.

The MSRZ(S)-10AS Dual-Channel Winding Resistance Tester (designed for temperature rise and heat-run testing) is specifically engineered for temperature rise measurements on large three-core, five-limb transformers. It features rapid charging and measurement speeds to meet the strict timing requirements of temperature rise tests. With dual-channel measurement, real-time sampling, and printout capabilities, it simplifies 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

1. Output Current:

High-voltage side: <15mA, 40mA, 200mA, 1A, 5A, 10A

Low-voltage side: 2A, 5A, 10A, 20A

2. Measurement Range:

High-voltage side:

n 0.5mΩ–0.8Ω (10A)

n 2mΩ–2Ω (5A)

n 10mΩ–10Ω (1A)

n 100mΩ–50Ω (200mA)

n 1Ω–250Ω (40mA)

n 10Ω–20kΩ (<15mA)

Low-voltage side:

n 200μΩ–1Ω (20A)

n 1mΩ–2Ω (10A)

n 2mΩ–1.6Ω (5A)

n 5mΩ–4Ω (2A)

3. Accuracy: ±(0.2% + 2 digits)

4. Resolution: 0.1μΩ

5. Operating Temperature: 0–40°C

6. Ambient Humidity: ≤90% RH, non-condensing

7. Power Supply: AC 220V ±10%, 50Hz ±1Hz

8. Dimensions: 441 × 450 × 177 (mm)

9. Net Weight: 17.6 kg

10. Test Lead Length: Standard 10m (customizable length available)