ZXDW-3A: Advanced Grounding Grid Testing

The ZXDW-3A Large-scale Grounding Grid Earth Resistance Tester is an essential instrument for electrical engineers and technicians responsible for the safety and integrity of grounding systems in substations, power plants, and telecommunication sites. This device provides a comprehensive solution for measuring keyparameters, including ground resistance, contact voltage, step voltage, and soil resistivity, which are critical for personnel safety and equipment protection.

A primary challenge in grounding system testing is the presence of strong interference from 50Hz industrial power sources. The ZXDW-3A effectively overcomes this with its Dual-Frequency Anti-Interference Technology. Instead of using a standard 50Hz test signal, the instrument injects currents at two different frequencies (45Hz and 55Hz). By measuring the response at these specific frequencies and processing the data, it can accurately isolate the grounding system's impedance from the ambient 50Hz noise. This allows for reliable testing without the need to de-energize the electrical facility, a significant operational advantage.

Key Technical Features and Capabilities:

1.High Accuracy & Wide Range: The tester offers a measurement range of 0 to 150Ω with a high resolution of 0.001Ω. Its accuracy of ±(2% of reading + 0.005Ω) makes it suitable for testing large grounding grids with very low impedance requirements, such as those in substations (target ≤4Ω).

2.Robust Test Signal: It can output up to 3A of test current at 420V. This powerful signal, combined with the dual-frequency sine wave, ensures sufficient signal strength for large-scale ground grids while preventing the grounding potential from rising to unsafe levels.

3.Multi-Functionality: Beyond basic ground impedance (Z), the unit can resolve its resistive (R) and reactive (X) components, providing a deeper diagnostic analysis of the grounding system's condition.

4.Enhanced Safety and Usability: Features like an open-circuit alarm for the test leads improve operational safety. Its menu-driven interface simplifies operation, and the compact, portable design (18kg) facilitates field use. The requirement for test leads is specified (current wire ≥1.5mm², voltage wire ≥1.0mm²), ensuring measurement accuracy.

Technical Specifications Summary:

1.Measurement Range: 0 – 150 Ω

2.Accuracy: ±(2% of reading + 0.005 Ω)

3.Test Current: 0 – 3 A AC (45Hz/55Hz)

4.Test Voltage: Up to 420 V AC (45Hz/55Hz)

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

6.Power Supply: AC 220V ±10%, 50Hz

In conclusion, the ZXDW-3A Grounding Grid Tester is a sophisticated yet user-friendly tool that leverages advanced signal processing to deliver precise and reliable measurements in electrically noisy environments. Its ability to test critical safety parameters without requiring a power shutdown makes it a highly efficient and valuable asset for technical teams maintaining high-voltage infrastructure.

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/