ZXR-10A+ 3-Channel DCR Tester: Comparative Analysis in Transformer Diagnostics

Transformer DC resistance measurement is critical for detecting manufacturing defects and operational risks in winding systems. Traditional single-channel testers often face limitations in efficiency and accuracy when handling complex three-phase transformer configurations. The ZXR-10A+ Three-Channel DC Resistance Tester, developed by [Company Name], addresses these challenges through innovative multi-channel testing capabilities. This article highlights its technical advancements and compares its performance with conventional methods.

Key Innovations and Comparative Advantages

1. Multi-Channel Testing Efficiency

Traditional Single-Channel Testers: Require sequential testing of individual phases (A0, B0, C0) for star-connected windings, leading to prolonged downtime and manual reconfiguration.

ZXR-10A+: Enables simultaneous three-phase testing for star-connected windings with a neutral point. It first measures the neutral line resistance (A0) independently, then performs three-phase parallel testing, reducing total measurement time by 60–70% while ensuring accuracy (results align with single-phase reference values).

2. Automated Analysis for Y/Δ Configurations

Conventional Approach: Manual calculation of phase-to-phase resistance and unbalanced ratios for delta (Δ) or ungrounded star (Y) connections, prone to human error.

ZXR-10A+: Automatically computes three-phase resistance values and unbalance ratios for Y and Δ windings, streamlining compliance with IEEE/IEC standards (e.g., ≤2% unbalance threshold).

3. Extended Measurement Range and Precision

Typical Testers: Limited to 0.1 mΩ–100 Ω ranges with ±0.5% accuracy, requiring multiple instruments for wide-ranging applications.

ZXR-10A+: Covers 0.5 mΩ–200 Ω across five current modes (20A to 0.1A) with ±(0.2% reading + 2 digits) accuracy. Its 0.1 μΩ resolution detects subtle defects like partial interturn shorts, outperforming competitors in sensitivity.

4. Safety and Usability Enhancements

Legacy Systems: Lack integrated protections, risking damage from back EMF or sudden power loss.

ZXR-10A+: Incorporates anti-back-EMF protection, open-circuit detection, and power-loss recovery, ensuring equipment and operator safety. The 7-inch LCD with multilingual menus simplifies operation, contrasting with older models reliant on complex manual controls.

5. Data Management Flexibility

Older Devices: Limited onboard storage (e.g., 50 datasets) and lack real-time printing/export options.

ZXR-10A+: Stores 200 datasets internally and supports USB exports to Word format for direct reporting. Integrated thermal printing eliminates post-test data transcription needs, unlike bulkier dot-matrix printers in traditional setups.

Technical Specifications Comparison

Field Applications

The ZXR-10A+ excels in scenarios where speed and precision are paramount:

1.Factory Acceptance Tests (FAT): Rapid three-phase measurements reduce production line bottlenecks.

2.On-Site Maintenance: Portable design (410×290×220 mm) simplifies transportation for substation or utility field tests.

3.Diagnostics: Detects loose connections, broken strands, or aging in critical windings during preventive maintenance.

The ZXR-10A+ redefines transformer DC resistance testing by merging multi-channel efficiency, high precision, and robust safety features. Compared to single-channel devices, it cuts testing time by over half while delivering laboratory-grade accuracy in field conditions. Its adaptability to Y/Δ configurations and advanced data handling make it indispensable for manufacturers, utilities, and service providers aiming to optimize transformer reliability and operational lifecycle.

GDZX is a manufacturer of power detection equipment, offering a diverse range of products with comprehensive models and providing professional technical support. Contact us at +86-27-6552607 or +86-17396104357.Website: http://en.gdzxdl.com/