At present, in the power system, the grounding resistance test of the earth grid is mainly measured by the power frequency high current three-pole method.
Good power frequency equivalence is measured. The test current waveform is sine wave, and the frequency difference is 0.1Hz and the maximum is 10Hz.It can be used at either 50 hz or 60 hz frequencies.
Strong anti-interference ability. The instrument adopts the different frequency method measurement, combined with the modern hardware and software filtering technology, make the instrument has a very high anti-interference performance, the test data is stable and reliable.
High measurement accuracy. The basic error is only 0.005 Ω, which can be used to measure the earth net with very small grounding impedance.
Powerful features. It can measure the current pile, voltage pile, ground grid impedance, grounding resistance, grounding conduction, soil resistivity, step voltage, contact voltage, potential gradient, etc.
Full touch LCD screen, large full graphical operation interface, every process is very clear. Operators need no additional training for professional use. The whole process can be done with a little touch.
It is equipped with calendar chips and large memory to save results at any time. Always view history and print out. Both the current time and the storage time can be displayed and printed.
Scientific and advanced data management: instrument data can be exported through U disk, and data can be viewed and managed in special software on any PC. Capable to generate reports and test reports
Safe and reliable. The instrument has grounding protection, current limit and pressure limit protection, sound and light alarm functions to ensure the safety of test personnel and equipment.
With the vector test function, it can measure the impedance and pure resistance of the ground grid. The impedance angle can be measured.
The wiring labor amount is small, no need for large current line.
Integrated model, with standard resistance and constant current source, to facilitate field testing and reduce field wiring.
The instrument is easy to operate, and the measurement process is controlled by the microprocessor. As long as the correct measurement method is selected, the measurement of the data can be automatically completed under the control of the microprocessor.
When the user needs a high current test (such as 30A), the instrument can be implemented by using the method of external power supply.
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