High Accuracy Earth Ground Resistance Tester Summary At present, in the power system, the grounding resistance test of large grounding grids is mainly measured by high frequency current three pole method. In order to prevent the power frequency interference and improve the accuracy of the measurement results, the insulation preventive test regulation stipulates that the test current of the high frequency current method shall not be less than 30 amperes. As a result, there are many problems such as heavy test equipment, complicated test process, great work intensity of test personnel and long test time.
HM3001 Grounding Grid Earth Resistance Tester, test of substation grounding grid (4), fire power plant, microwave station (10), the lightning rod (10) with multiple models, using a new type of variable frequency AC power supply, and adopts the microcomputer control and signal processing and other measures, is a very good solution anti interference problem in the process of testing, simplifies the test operation process, improves the precision and accuracy of the test results, and greatly reduce the labor intensity and the cost of test and test personnel.
The instrument is suitable for testing the power frequency characteristic parameters of various grounding devices, such as power frequency grounding resistance, and the soil resistivity. The instrument adopts different frequency anti-jamming technology, can under the condition of strong interference and accurate measured data under the frequency of 50Hz. The maximum test current is 5A, the potential of the grounding device is not too high when tested, and it also has strong anti-interference ability, so it can be measured under the condition of no power failure.
Advantage 1.Good power frequency equivalence, test current waveform is sine wave, it has only 5Hz with the power frequency difference, using 45Hz and 55Hz two kinds of frequency to carry on the measurement. 2.Strong anti-interference ability. The instrument adopts the different frequency measurement method, combined with modern hardware and software filtering technology, the instrument has high anti-interference performance, stable and reliable test data. 3.High accuracy, basic error is only 0.005 ohms, which can be used to measure large ground grids with little grounding impedance. 4.Powerful funcation. It can measure the current pile, the grounding resistance of the voltage pile, the grounding resistance of the grounding network, the on resistance, and the soil resistivity. 5. Simple operation. All Chinese/english menu type operation, directly display measurement results. 6.Simple wiring,strong current line is unnecessary.
Technical index 1. Impedance measurement range: 0~5000Ω 2. Resolution: 0.001MΩ 3. Measurement error: + (readings x2%+0.005Ω) 4. Test current waveform: sine wave 5. Test current frequency: 45, 50, 55, 60, 65Hz single frequency 45/55Hz, 55/65Hz, 47.5/52.5Hz automatic dual frequency conversion 6. Output current: 1, 2, 3, 4, 5A 7. Maximum output voltage: 450V 8. Measuring line requirements: current line copper core cross-sectional area ≥1.5mm2 Voltage line copper core cross-sectional area ≥1.0mm2 9. Power supply: AC180 to 270V, 50/60Hz 10. Size: 355 * 335 * 340mm 11. Weight: 18kg
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