Large scale grounding resistance tester can measure the grounding resistance of substations, etc

Large scale grounding resistance tester can measure the grounding resistance of substations, etc

In the power system, the grounding resistance of large grounding grids is mainly measured using the power frequency high current three pole method. In order to prevent power frequency interference during the operation of the power grid and improve the accuracy of measurement results, the insulation preventive test regulations stipulate that the test current of the power frequency high current method shall not be less than 30 amperes. As a result, there are many problems such as bulky testing equipment, complex testing processes, high workload of testing personnel, and long testing times
A large-scale grounding resistance tester can measure the crowding of substation grounding (4 Ω), hydro thermal power plants, microwave stations (10 Ω), and lightning rods (10 Ω); A new type of signal power supply has been adopted, and measures such as microcomputer processing control and signal processing have been taken to effectively solve the anti-interference problem in the testing process, simplify the experimental operation process, improve the accuracy and precision of the testing results, and greatly reduce the labor intensity and testing cost of the testing personnel.

1. The measured power frequency equivalence is good. The test current waveform is a sine wave, with a frequency difference of only 5Hz from the power frequency. Two frequencies, 45Hz and 55Hz, are used for measurement.
2. Strong anti-interference ability. This instrument adopts the frequency difference method for measurement, combined with modern software and hardware filtering technology, making the instrument have high anti-interference performance and stable and reliable test data.
3. High precision. The basic error is only 0.005 Ω, which can be used to measure large grounding grids with very low grounding impedance.
4. Powerful functionality. Can measure current pile, voltage pile, grounding resistance, step voltage, and contact voltage.
5. Easy to operate. Fully Chinese menu style operation, directly displaying measurement results.
6. Low wiring workload, no need for high current wires.

Impedance measurement range: 0-200 Ω
2. Resolution: 0.001 Ω
3. Measurement error: ± (reading x 2%+0.005 Ω)
4. Anti power frequency 50Hz voltage interference capability: 10V
5. Test current waveform: sine wave
6. Test current frequency: 45Hz, 55Hz dual frequency
7. Maximum output current:
8. Maximum output voltage: 400V
9. Measurement line requirement: The cross-sectional area of the copper core of the current wire should be ≥ 1.5mm2
Voltage wire copper core cross-sectional area ≥ 1.0mm2
10. Power supply: AC220V ± 10%, 50Hz
11. Dimensions: 440 × 350 × 210
12. Instrument weight: 10kg