NEWSnews
What is ZXR-3A Transformer Winding Resistance Tester？
What is ZXR-3A Transformer Winding Resistance Tester: A Modern Alternative to Bridge Methods in Power Industry
The measurement of transformer winding resistance is critical for assessing electrical integrity, detecting faults, and ensuring operational efficiency in power systems. Traditional methods like single-arm and double-arm Kelvin bridges have long been used for this purpose, but they suffer from limitations in speed, accuracy, and field adaptability. The ZXR-3A Transformer Winding Resistance Tester emerges as a high-precision, modern solution designed to overcome these challenges. This article explores its technical advantages over conventional bridge methods and its role in advancing power industry practices.
Key Limitations of Traditional Bridge Methods
1.Slow Measurement Speed:
Manual balancing of bridges and reliance on mechanical adjustments lead to prolonged testing times, especially for large inductive loads (e.g., power transformers).
2.Environmental Sensitivity:
LED displays in older devices struggle with readability under direct sunlight, while analog components are prone to drift under temperature fluctuations.
3.Limited Portability:
Most bridge setups require stable AC power sources and lack integrated batteries, restricting field applications.
4.Low Automation:
Arc suppression and current stabilization rely on operator intervention, increasing error risks.
ZXR-3A: Technical Advancements and Comparative Advantages
1. Speed and Efficiency
3A Fast Charging:
The ZXR-3A employs switch-mode power supply technology to deliver up to 3A test current, accelerating core saturation in inductive loads. This reduces charging time by 100x compared to traditional bridges.
Auto Arc Suppression:
Eliminates manual intervention during demagnetization, further streamlining workflows.
Comparison:
Single-arm bridge: 5–10 minutes per phase (small transformers).
ZXR-3A: <10 seconds for similar measurements.
2. Precision and Stability
Four-Terminal Measurement:
Minimizes contact resistance errors, achieving 0.5% accuracy (vs. 1–2% in analog bridges).
Constant Current Source:
Maintains stable output (3A to 0.003A across ranges), ensuring repeatability even in noisy environments.
High-Resolution Display:
Dual LCD screens (4½-digit for resistance, 3½-digit for temperature/current) provide clarity in outdoor settings—a stark improvement over LED-based bridges.
3. Versatility and Portability
Wide Resistance Range:
1μΩ–2kΩ coverage suits applications from LV windings to HV bushings, eliminating the need for multiple instruments.
Hybrid Power Supply:
Built-in 12V Li-ion battery (2.2Ah) supports 4–6 hours of field use, complemented by AC/DC compatibility.
Compact Design:
At 2.8kg and 335×275×175mm, it is 60% lighter than bridge setups requiring external current sources and meters.
4. User-Centric Features
Temperature Compensation:
Ambient temperature monitoring (0–40°C) aids in data correction, addressing a gap in bridge methods.
Low Power Consumption:
≤15W operation reduces thermal stress, enhancing longevity vs. power-hungry bridge systems.
Technical Specifications Summary
Parameter | ZXR-3A Tester | Traditional Bridges |
Measurement Range | 1μΩ–2kΩ | 10mΩ–1kΩ (typical) |
Accuracy | 0.5% ±1μΩ | 1–2% (dependent on operator) |
Test Current | 3A–0.003A (auto-ranging) | Manual adjustment required |
Display | Dual LCD (sunlight-readable) | Analog scales/LED |
Power Source | AC/DC + rechargeable battery | AC-dependent |
Arc Suppression | Automatic | Manual |
Applications in Power Industry
1.Preventive Maintenance: Rapid detection of winding deformations, loose connections, or insulation degradation.
2.Factory Acceptance Testing (FAT): High repeatability ensures compliance with IEC 60076 standards.
3.Field Diagnostics: Battery-powered operation enables on-site testing of grid transformers, generators, and reactors.
The ZXR-3A Transformer Winding Resistance Tester redefines efficiency and reliability in winding resistance measurement. By replacing outdated bridge methods with advanced digital controls, hybrid power, and robust anti-interference design, it addresses long-standing pain points in power system testing. For utilities and service teams prioritizing speed, accuracy, and field adaptability, the ZXR-3A stands as a transformative tool in modern electrical asset management.
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/
