How to use the large-scale grounding resistance tester? In recent years, many domestic substations have experienced lightning expansion accidents, and most of them have problems with the grounding resistance of the grounding network. In a factory, if there is a problem with the resistance voltage of the equipment, it will directly affect its use, so check the resistance of the equipment at regular intervals.

What kind of resistance measurer would you choose? There is a new type of instrument called a large grounding resistance tester.

Large-scale grounding grid grounding resistance tester is suitable for measuring commercial grounding resistance, contact voltage, step voltage, and other power frequency characteristic parameters and soil resistivity of various grounding devices.

How to use the large grounding resistance tester? Is this equipment good?

① This instrument uses different frequency anti-interference technology, which can accurately measure the data at power frequency 50Hz in a strong interference environment. The maximum test current is 50A, and the potential of the grounding device will not be too high during the test. At the same time, the instrument adopts the inter-frequency method for measurement, combined with modern software and hardware filtering technology, so that the instrument has a high anti-interference performance, the test data is stable and reliable, and it can be measured without power failure.

②The power frequency equivalence measured by the earth network grounding resistance measuring instrument is good, the test current waveform is a sine wave, and the frequency and the power frequency are only 5Hz apart. Two frequencies of 45Hz and 55Hz are used for measurement.

③The accuracy is high, and its basic error is only 0.005Ω, so it can be used for the measurement of large ground networks with small ground impedance.

④ Powerful functions. It can measure all the characteristic parameters of the grounding device specified by the relevant standards, including current piles, voltage piles, grounding resistance, step voltage, contact voltage, etc.

To sum up, the earth grid grounding resistance tester has many functions and is a good choice for measuring resistance, but how to use the large-scale earthing resistance tester?

First, check whether the current line, voltage line and grounding line of the multimeter used for testing are disconnected, remove the corrosion of the ground pile, and confirm whether the buried depth is more than 0.5 meters. At the same time, check whether the connection between the test line and the ground pile is conductive. No conduction, then reconnect

The current test line and the voltage test line are of the specified length (the length ratio of the current test line and the voltage test line is 1:0.618, and the length of the current test line is 3~5 times the diagonal of the ground network), and one end is parallel to the device for launch , The other end is connected with two piles respectively. Then, connect one end of the multimeter to the current line or voltage line, and the other end to the network line. After confirming that it is correct, connect the AC 220V/50Hz power supply, power on and start measurement, record the test data, turn off the power supply, and disconnect it.