Ground resistance tester is a common instrument for inspecting and measuring ground resistance
The ground resistance tester is a common instrument for inspecting and measuring ground resistance, and it is also an indispensable tool for electrical safety inspections and the acceptance of grounding engineering completion. For large ground grids, "ground resistance" exhibits a more obvious "complex impedance" nature, that is, it includes both resistance and reactance components, so the concept of "ground impedance" should be adopted to replace "ground resistance". In power systems with higher voltage levels, the single-phase ground fault current increases significantly. The new version of DL/T475-2006 "Guide for Measurement of Grounding Device Characteristic Parameters" stipulates the measurement of items such as "field area surface potential gradient", "contact voltage", and "step voltage".
HF8100(3A)/HF8150(50A) Large ground grid ground resistance tester is a special instrument for measuring the characteristic parameters of grounding devices. The instrument adopts frequency conversion anti-interference technology and can accurately measure in the strong interference environment of substations. The measurement results are displayed on a large screen LCD, and a built-in micro printer can print out the results. It is suitable for testing grounding systems under construction or in operation in power plants, substations, distribution stations, buildings, etc.
Technical Parameters
Impedance measurement range: 1mΩ~1000Ω
Resolution: 0.001Ω
Measurement error: ±(reading ×2% +0.005Ω)
Anti-interference capability for power frequency 50Hz voltage: 10V
Test current waveform: Sine wave
Test current frequency: 45Hz, 55Hz dual frequency
Maximum output current: Internal power supply current 1~5A External power supply current 0~50A
Maximum output voltage: Internal power supply voltage 0~400V External power supply voltage 0~800V
Measurement line requirements: Current line copper core cross-sectional area ≥1.5mm2
Voltage line copper core cross-sectional area: ≥1.0mm2
Power supply: AC220V±10%, 50Hz
Dimensions: 440×350×210
Instrument weight: 10kg
