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Technical Analysis of ZXR-20A DC Resistance Tester for Power Equipment
Introduction
The ZXR-20A DC Resistance Tester represents a significant advancement in electrical testing technology, designed to address the challenges of measuring transformer winding resistance with high precision, efficiency, and reliability. Combining cutting-edge hardware and intelligent software, this device is engineered for applications in large- and medium-sized transformer testing, offering superior performance in diverse industrial environments. Below, we delve into its key features, technological innovations, and technical specifications.
Key Features
Advanced Control System
The ZXR-20A is governed by a high-speed single-chip microcomputer, ensuring high automation levels and simplified operation. This intelligent control system enables rapid data processing, seamless range switching, and real-time measurement adjustments, minimizing manual intervention.
High-Frequency Switching Power Supply
Utilizing high-frequency switching power supply technology, the instrument delivers large output currents (up to 20A), making it ideal for testing transformers with low DC resistance. This design ensures stable current output even under demanding conditions.
Enhanced Protection Mechanisms
Equipped with comprehensive protection functions, the device safeguards against back electromotive force (EMF) impacts and operational errors. Features like discharge alarms and visual discharge indicators further reduce risks during testing.
Rapid Response & Auto-Refresh
The tester’s fast response capability allows immediate measurement of load tap changes without restarting the process. Data automatically refreshes, streamlining workflow in dynamic testing environments.
Portable & Robust Design
With a compact vertical chassis (440×240×390mm) and lightweight construction (12kg), the ZXR-20A is optimized for field use. Its rugged design ensures durability, while the dot-matrix LCD with English menus enhances user interface clarity.
Energy Efficiency & Thermal Management
An intelligent power management system keeps the instrument in a low-power state during operation, reducing internal heat generation and energy consumption. This extends device lifespan and improves reliability.
High Precision & Resolution
Boasting an accuracy of 0.2% and a resolution of 0.1μΩ, the tester delivers exceptional measurement precision, critical for diagnosing transformer health and detecting faults like loose connections or insulation degradation.
Technical Specifications
Parameter | Details |
Output Current | 2.5A, 5A, 10A, 20A (user-selectable) |
Measurement Range | 100μΩ–1Ω (20A); 500μΩ–2Ω (10A); 1mΩ–4Ω (5A); 2mΩ–8Ω (2.5A) |
Accuracy | ±0.2% |
Resolution | 0.1μΩ |
Operating Temperature | 0 to 40°C |
Humidity Tolerance | ≤90% RH |
Power Supply | AC 220V ±10%, 50Hz ±1Hz |
Dimensions | 440×240×390mm |
Net Weight | 12kg |
Applications
The ZXR-20A is tailored for:
Transformer Testing: Direct resistance measurement of windings to assess manufacturing quality, aging, or damage.
Field Maintenance: Portable design enables on-site diagnostics for power grids and substations.
Industrial Laboratories: High repeatability and anti-interference capabilities suit R&D and quality control environments.
Conclusion
The ZXR-20A DC Resistance Tester stands out as a versatile, high-performance solution for modern electrical testing needs. Its integration of high-speed computing, robust power delivery, and user-centric features—such as auto-discharge alerts and multilingual interfaces—positions it as a critical tool for power utilities, transformer manufacturers, and maintenance teams. By balancing precision, portability, and reliability, this instrument exemplifies innovation in power equipment diagnostics, ensuring efficient and accurate transformer assessments in an evolving energy landscape.
Keywords: DC resistance tester, transformer testing, high-frequency switching power supply, single-chip microcomputer, precision measurement.
