Product Introduction

        Transformer DC resistance is a mandatory test item in transformer manufacturing for semi-finished and finished products, factory acceptance tests, installation, major overhauls, after tap changer adjustments, handover tests, and preventive tests conducted by power departments. It can inspect the welding quality of winding connections and detect inter-turn short circuits in windings. It also verifies whether each position of the tap changer makes good contact, whether the actual position of the tap changer matches the indicated position, whether there are broken leads, and whether there are broken strands in multi-strand parallel windings. To meet the need for rapid measurement of transformer DC resistance, our company has developed the NDZR-50A Transformer DC Resistance Tester. This instrument adopts advanced power supply technology, featuring compact size, light weight, high output current, excellent repeatability, strong anti-interference capability, and comprehensive protection functions. The entire unit is controlled by a high-speed microcontroller, offering a high degree of automation with automatic discharge and discharge alarm functions. The instrument ensures high testing accuracy, ease of operation, and enables rapid measurement of transformer DC resistance.

Product Features

☆ The entire unit is controlled by a high-speed microcontroller, offering high automation and ease of operation.

☆ The instrument uses advanced power supply technology with multiple current ranges and a wide measurement scope, suitable for DC resistance measurement of large and medium-sized transformers.

☆ Comprehensive protection functions reliably safeguard against back EMF impacts, ensuring higher reliability.

☆ Features audible discharge alarms and clear discharge indicators to reduce operational errors.

☆ Fast response speed.

☆ Intelligent power management technology keeps the instrument operating at low power, effectively saving energy and reducing heat generation.

☆ Equipped with a 65K true-color LCD with 320x240 dot matrix and ultra-fine pixels.

☆ Built-in perpetual calendar clock and power-off storage, capable of storing 1000 sets of test data for easy access at any time.

☆ Includes RS232 and USB interfaces for computer communication and USB storage.

☆ Comes with a built-in panel micro-printer that can print measurement results in Chinese.

Technical Parameters

☆ Test Current: <5mA, 2.5A, 5A, 10A, 20A, 50A

☆ Measurement Range: 50μΩ~400mΩ (50A)   

                       100μΩ~1Ω (20A)

                       500μΩ~2Ω (10A)

                       1mΩ~4Ω (5A)  

                        2mΩ~8Ω (2.5A)  

                        10Ω~20kΩ (<5mA)

☆ Resolution: ≥0.1μΩ

☆ Accuracy: ±(0.2%+2 digits)

☆ Display: LCD display     Resistance display with 4 significant digits

☆ Data Storage: 1000 sets

☆ Operating Environment: Ambient temperature: 0℃~40℃   Relative humidity: <90%RH, non-condensing

☆ Power Supply: AC 220V±10V, 50HZ±1HZ   Fuse: 10A

☆ Power Consumption: ≤1000W

☆ Dimensions: 400×225×350 (mm)

☆ Weight: Main unit: 15.1KG   Cable box: 6.25KG