ZXR-20A+ Tri-Channel Tester: Efficient Transformer Analysis

DC resistance testing is critical for assessing transformer health and operational stability. Traditional single-channel testers often struggle with efficiency and multifunctional demands in large-scale power transformer diagnostics. The ZXR-20A+ Tri-Channel DC Resistance Tester addresses these limitations by integrating three-phase measurement, demagnetization, and assistive magnetization into a single platform. This article explores its technical superiority over conventional solutions through performance benchmarks, functional versatility, and operational safety.

Key Features and Comparative Advantages

1. Three-Phase Testing Capability

ZXR-20A+: Supports Yn, Y, and Δ winding configurations with simultaneous three-phase measurement, calculating unbalanced ratios (≤2% typical) in a single test cycle.

Traditional Testers: Require sequential single-phase measurements, increasing setup time by 50–70% and risking data inconsistency due to environmental drift.
Advantage: Eliminates repetitive wiring, reduces testing time by 60%, and ensures phase-synchronized data accuracy.

2. Extended Range and Precision

Measurement Range:

Single-phase: 0.1 mΩ–25 kΩ (40 A to <1 mA), covering ultra-low resistance (e.g., LV windings) to high-resistance applications (e.g., tap changers).

Three-phase: 0.5 mΩ–8 Ω (20 A+20 A to 1 A+1 A).

Accuracy: ±(0.2% reading + 2 digits), outperforming industry-standard ±(0.5% + 5 digits) in comparable devices.
Advantage: Broad coverage eliminates the need for secondary instruments, reducing costs and logistical complexity.

3. Intelligent Stability Analysis

Automatically calculates resistance change rates at 5 s, 15 s, and 30 s intervals, flagging instability (>1% drift) to prevent erroneous readings.

Contrast: Manual monitoring in conventional systems introduces human error risks (e.g., missed transient fluctuations).

4. Integrated Demagnetization and Safety

Demagnetization Function: Reduces residual magnetism to <5% of initial value post-test, preventing inrush currents during re-energization.

Protection Mechanisms:

380 V misconnection protection.

Back-EMP suppression (up to 500 V).

Real-time ground-fault alerts.

Contrast: Legacy systems often require external demagnetizers and lack comprehensive fault tolerance.

5. User-Centric Design

7-inch Industrial Touchscreen: Combines capacitive touch with a rotary encoder for glove-friendly operation (-10°C to 50°C).

Data Management: Onboard storage (200 datasets), USB export, and thermal printing streamline reporting.

Contrast: Monochrome LCDs and button-based UIs in older models hinder field usability.

Technical Specifications vs. Market Alternatives

Applications

1.Power Transformers: Rapid three-phase DC resistance testing for maintenance (e.g., IEC 60076).

2.Manufacturing QC: High-throughput production-line validation.

3.Renewable Energy: Wind turbine step-up transformer diagnostics.

The ZXR-20A+ redefines DC resistance testing by merging laboratory-grade precision with ruggedized field usability. Its three-channel architecture, coupled with embedded analytical tools and safety systems, delivers a 40% efficiency gain over conventional approaches while mitigating operational risks. For utilities and service teams prioritizing diagnostic accuracy and workflow optimization, this instrument sets a new benchmark in transformer testing technology.

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/