ZXDW-5A Dual-Frequency Ground Tester

The ZXDW-5A Large-scale Grounding Grid Earth Resistance Tester represents a significant tool for electrical engineers and technicians responsible for the safety and integrity of grounding systems in substations, power plants, and telecommunication sites. This instrument is engineered to accurately measure power-frequency ground resistance, step voltage, touch voltage, and soil resistivity without the need for a power shutdown, a critical advantage for maintaining continuous operation in live electrical environments.

Core Functionality and Applications

The primary application of the ZXDW-5A is the evaluation of grounding systems. It is capable of testing:

1.Substation Grounding Grids: with a typical capability for impedances up to 4Ω.

2.Power Plants and Microwave Stations: suitable for systems with ground resistance up to 10Ω.

3.Lightning Rod Grounding: provides reliable data for various lightning protection systems.

Its ability to perform these tests on live, operational systems makes it an indispensable tool for predictive maintenance and safety compliance.

Key Technological Features

1.Dual-Frequency Anti-Interference Technology: This is the cornerstone of the ZXDW-5A's performance. Instead of using a standard 50Hz test signal, which is susceptible to interference from ambient power-line noise, the device employs two specific frequencies: 45Hz and 55Hz. By injecting a sine wave current at these frequencies and using advanced digital signal processing (hardware and software filtering), the instrument can effectively isolate the test signal from the strong 50Hz industrial interference. This ensures stable and reliable readings even in electrically noisy environments.

2.High-Current Testing with Safety: The tester can output up to 5A of test current. A higher test current improves the signal-to-noise ratio, leading to more accurate measurements, particularly for low-impedance grounding grids. Despite this high current, the device is designed to prevent the grounding device potential from rising to dangerous levels, ensuring operational safety.

3.High Precision and Wide Range: With a basic intrinsic error as low as 0.005Ω and a resolution of 0.001Ω, the ZXDW-5A is precise enough to measure very small impedances, which is crucial for large, well-designed grounding grids. The measurement range extends from 0 to 150Ω, covering a wide variety of field conditions.

4.Comprehensive and User-Friendly Operation: The instrument consolidates multiple testing functions into a single unit. Technicians can measure ground resistance, the impedance of current and voltage poles, step voltage, and touch voltage. The menu-driven interface simplifies operation, and results are displayed directly, streamlining the fieldwork process.

5.Practical Field Design: The device eliminates the need for heavy, high-current wires, enhancing portability. It specifies flexible requirements for test leads (current wire ≥1.5 mm², voltage wire ≥1.0 mm²), making setup more straightforward.

Technical Specifications Summary

1.Measurement Range: 0 – 150 Ω

2.Accuracy: ±(2% of reading + 0.002 Ω)

3.Output Current: 5A max (user-selectable in 0.5A steps from 0.5A to 5A)

4.Output Voltage: 400V AC (45Hz/55Hz sine wave)

5.Anti-Interference: Capable of rejecting ≥10V of 50Hz noise

6.Power Supply: AC 220V ±10%, 50Hz

Conclusion

For technicians and engineers, the ZXDW-5A provides a robust, accurate, and efficient solution for grounding system assessment. Its advanced dual-frequency filtering technology allows for reliable data acquisition in challenging electromagnetic environments without requiring de-energization of the facility. This combination of power, precision, and practical safety features makes it an essential instrument for ensuring the effectiveness and safety of large-scale grounding grids.
    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/