Ground Resistance Tester for Earth Grid

Product Introduction

The current domestic testing of grounding devices is relatively weak, with some key technical concepts being unclear and the technical methods lagging behind. In response to this situation, China has formulated new industry standards.DL/T475-2006In compliance with the National Standard GB/T17949.1-2000The new standard brings significant changes to the old one. To facilitate field testing and researchers, we have developed this instrument based on these new standards, combining our years of practical experience in large ground network testing.

Industrial frequency grounding impedance refers to the ratio of the potential difference between the ground equipment and the remote potential zero point to the industrial frequency current flowing into the ground through the grounding equipment. Industrial frequency grounding impedance was previously commonly referred to as“Industrial Frequency Ground ResistanceThis correction of the name, as stated in the national standard GB/T17949.1-2000,Guidelines for Soil Resistivity, Ground Impedance, and Ground Potential Measurement of the Grounding SystemNo Chinese content provided..Routine measurements”And the power industry standard “Guidelines for Measurement of Grounding Device Characteristic Parameters (Revised Draft)Replace DL475-92The explanation was elaborated upon. This measuring instrument uses alternating current for testing, thus the measured values are referred to as ground impedance, rather than continuing to use the previous term.Ground Resistance。

This instrument is designed for testing the AC impedance, contact voltage, step voltage, transfer potential, and surface potential gradient in the field area of various grounding installations, as well as soil resistivity. Utilizing heterodyne anti-interference technology, it can accurately measure AC parameters in environments with strong interference.50HzThe data below. Test current is relatively low (0).～3.0AIt will not cause the potential of the grounding device to be too high during testing, and it also hasExtreme.Robust anti-interference capability, allowing for measurements without power interruption.

Key Features

3.1The measurement has excellent 50/60Hz equivalent performance. The test current waveform is sinusoidal, measured at two frequencies.

3.2High resistance to ground voltage interference. This instrument uses the heterodyne method for measurement, complemented by modern hardware and software filtering techniques, resulting in excellent anti-interference performance and stable, reliable test data. 15VIndustrial Frequency (50Hz)The error caused by interference voltage is only 0.001Ω.。

3.3High precision. Suitable for measuring the small grounding impedance of large ground networks.

3.4Robust and comprehensive, the device can measure all characteristic parameters of grounding equipment as specified by relevant standards. It not only measures the grounding impedance but also measures the resistive and reactive components.

3.5Features a disconnection alarm function to prevent erroneous measurements.

3.6User-friendly. Full Chinese menu-style operation, displaying measurement results directly.The unit also features a built-in mini printer for on-site printing of measurement results.

3.7Minimal wiring labor required; no large current cables needed.

3.8This instrument is compact and lightweight, making it easy to carry.