Lightning Protection Grounding Resistance Test

I. Instrument Overview

Currently, in the power system, the testing of grounding resistance in large area grids primarily employs AC (alternating current) large currents.Extreme.To prevent the interference generated by the power grid during operation and to enhance the accuracy of measurement results, the insulation preventive testing regulations stipulate that the test current for the power frequency large current method shall not be less than...30Ampere. Consequently, issues such as bulky testing equipment, complex testing processes, high work intensity for testers, and extended testing periods have arisen.

EDWR-5Type Large-Scale Earth Grid Resistance Tester, capable of measuring transformer substation earth grid4Hydroelectric and thermal power plants, microwave stations10Ω)、Lightning Rod10Ω) The multi-type model utilizes a new variable-frequency AC power supply, incorporates microcomputer processing control, and signal processing measures, effectively resolving anti-interference issues during testing. This simplifies the test operation process, enhances the accuracy and precision of test results, and significantly reduces the labor intensity and cost for testers.

This instrument is suitable for testing the working frequency grounding impedance, contact voltage, step voltage, and other working frequency characteristics of various grounding devices, as well as soil resistivity. Equipped with heterodyne anti-interference technology, it can accurately measure working frequency in strong interference environments.50HzThe following data. Test current high.5AIt will not cause the potential of the grounding device to be too high during testing, and it also hasExtreme.Robust anti-interference capability, enabling measurements to be conducted without power interruption.

II. Performance Features

1The measured AC equivalent performance is excellent. The test current waveform is a sine wave, with the frequency differing only slightly from the power frequency.5HzPlease provide the Chinese content to be translated.45Hz No Chinese content provided.55Hz Measurements were taken at two frequencies.

2Highly resistant to interference. This instrument employs the heterodyne method for measurement, complemented by modern hardware and software filtering technology, resulting in excellent anti-interference performance and stable, reliable test data.

3High precision. Basic error only.0.005Ω is used to measure the very low ground impedance of large ground networks.

4Powerful. Measures current posts, voltage posts, ground resistance, step voltage, and contact voltage.

5Operation is simple. Full Chinese menu-style operation, displaying measurement results directly.

6Minimal wiring labor required; no need for high current wires.

III. Technical Indicators

1Impedance measurement range:0～150Ω

2Resolution:0.001Ω

3Measurement Error: ±(Reading ×)2％+0.005Ω）

4No Chinese content provided for translation.50Hz Voltage Interference Resistance:10V

5Test Current Waveform: Sine Wave

6Test Current Frequency:45Hz、55Hz Dual Frequency

7High output current:5A

8High output voltage:420V

9Measurement Requirement: Current wire copper core cross-sectional area ≥1.5mm2

Voltage wire copper core cross-sectional area≥1.0mm2

10Power Supply:AC220V±10％，50Hz

11Dimension:440×350×210

12Instrument Weight:38kg