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What is ZXR-5A DC resistance tester: Application analysis of the power industry
The ZXR-5A DC Resistance Tester is a cutting-edge instrument designed for precise measurement of low-resistance values in inductive components such as power transformers and mutual inductor windings. In the power industry, accurate resistance measurement is critical for evaluating equipment health, detecting faults, and ensuring operational safety. This article explores the technical advantages of the ZXR-5A and contrasts its features with conventional resistance testers.
Key Features and Technical Advantages
1.Advanced Measurement Methodology
The ZXR-5A employs a four-terminal (Kelvin) measurement technique, eliminating errors caused by lead resistance and contact impedance. This sets it apart from traditional two-terminal testers, which often suffer from inaccuracies due to parasitic resistances. For example, when measuring transformer windings (typically <1Ω), even minor lead resistance can skew results. The ZXR-5A addresses this with its proprietary linear current compensation, achieving an accuracy of ±0.5% +2d for resistances above 10mΩ.
2.Intelligent Operation and Efficiency
Unlike manual bridge-based testers (e.g., Wheatstone bridges), the ZXR-5A integrates microprocessor control and an intuitive LCD interface. Operators no longer need to memorize complex procedures or manually balance circuits. The device automatically selects test currents (5A to 0.005A) and ranges (0–2000Ω), reducing measurement time by 50–70% compared to legacy systems. A built-in printer further streamlines reporting—a feature absent in most basic models.
3.Safety and Portability
The ZXR-5A incorporates anti-back-EMF protection, safeguarding against voltage spikes during inductive load disconnection—a common risk when testing transformer windings. Traditional testers often require external surge suppressors for such scenarios. Additionally, weighing only 3kg and powered by a rechargeable lithium battery, the ZXR-5A outperforms bulky benchtop units (e.g., 10kg+ models) in field applications like substation maintenance.
Comparative Analysis with Conventional Testers
Parameter | ZXR-5A | Traditional Testers |
Measurement Method | Four-terminal, auto-ranging | Two-terminal, manual range selection |
Accuracy (10mΩ–2kΩ) | ±0.5% +2d | ±1–2% (subject to lead resistance) |
Test Speed | <10s per measurement | 30s–2min (manual adjustments needed) |
Safety Features | Built-in overvoltage protection | External protection devices required |
Portability | 3kg, battery-operated | 8–15kg, AC-dependent |
User Interface | Graphical LCD with prompts | Analog dials or minimal digital displays |
Technical Specifications and Industry Applications
1.Measurement Range: 0–2000Ω (6 ranges), resolving down to 1μΩ, ideal for precision tasks like detecting shorted turns in transformer windings.
2.Power Efficiency: ≤30W consumption vs. 100W+ in older models, critical for prolonged field use.
3.Environmental Resilience: Operates at 0–40°C and 85% RH, suitable for harsh substation environments.
Typical applications include:
1.Routine maintenance of 10kV–500kV power transformers.
2.Quality control during manufacturing of mutual inductors.
3.Fault diagnosis in high-resistance connections of circuit breakers.
The ZXR-5A DC Resistance Tester redefines efficiency and accuracy in low-resistance measurement for the power industry. Its combination of four-terminal technology, intelligent automation, and compact design addresses the limitations of conventional testers, particularly in field diagnostics and high-precision scenarios. By reducing human error, accelerating workflows, and enhancing safety, the ZXR-5A emerges as a superior choice for utilities and equipment manufacturers seeking reliable, portable, and future-proof testing solutions.
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/
