Product Introduction

       The DC resistance of a transformer is a mandatory test item during the manufacturing process, factory acceptance tests, installation, commissioning tests, and preventive maintenance tests conducted by power departments. It effectively identifies issues such as material selection, welding defects, loose connections, missing strands, broken wires in transformer windings, as well as problems that may arise during operation. To meet the need for rapid measurement of transformer DC resistance, the instrument adopts advanced power supply technology, featuring compact size, light weight, and high output current. Controlled by a single-chip microcomputer, it automatically performs self-check, data processing, and display functions, with automatic discharge and discharge indication. The instrument offers high testing accuracy, ease of operation, and enables rapid measurement of transformer DC resistance.

        The NDZRS-20A Transformer DC Resistance Tester (Dual Channel, Temperature Rise) is specifically designed for temperature rise measurement of three-core five-limb large transformers. It features fast charging and measurement speeds, meeting the time requirements for transformer temperature rise tests. With dual-channel measurement, real-time sampling, and print output, it makes temperature rise tests no longer a challenge.

Product Features

☆ High output current and voltage.

☆ Dual-channel measurement, simultaneously measuring two resistance values.

☆ Comprehensive protection circuit with high reliability.

☆ Horizontal structure, facilitating on-site operation in transformer factories.

☆ Audible discharge signal prompt and clear discharge indication to reduce misoperation.

Technical Parameters

☆ High-voltage side output current: <15mA, 40mA, 200mA, 1A, 5A

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

☆ Range:

      High-voltage side:

      1mΩ～2Ω   (5A)

      5mΩ～10Ω   (1A)

      100mΩ～50Ω   (200mA)

      1Ω～250Ω   (40mA)

      10Ω～20kΩ   (<15mA)

      Low-voltage side:

      100μΩ～500mΩ  (20A)

      200μΩ～1Ω   (10A)

      1mΩ～1.6Ω   (5A)

      5mΩ～4Ω   (2A)

☆ Accuracy: ±(0.2%+2 digits)

☆ Resolution: 0.1μΩ

☆ Operating temperature: 0～40℃

☆ Environmental humidity: ≤90%RH, no condensation

☆ Power supply: AC220V±10%, 50HZ±1HZ

☆ Dimensions: 448*463*177(mm)

☆ Net weight: 17.6KG