Large Ground Grid Tester - Yangzhou Darui
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Large Ground Grid Tester is a software and hardware system mainly used for accurately measuring grounding characteristics parameters of large grounding grids, such as grounding impedance, grounding resistance, grounding reactance, field surface potential gradient, contact potential difference, contact voltage, step potential difference, step voltage, transfer potential, grounding down-conductor continuity resistance, soil resistivity, etc. It adopts point-by-point frequency conversion, has extremely strong anti-interference capability, and can accurately measure data at power frequency 50Hz under strong interference environments. The system has large output power (2-20KW), high voltage (0-1000V), and large output current (0-50A), which will not cause excessive potential rise of the grounding device during testing. At the same time, it also has extremely strong anti-interference capability, so measurement can be carried out without power outage.
In power systems, the grounding resistance test of large ground grids mainly adopts the power frequency high-current three-electrode method. In order to prevent power frequency interference generated during grid operation 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, problems such as bulky test equipment, complex test procedures, high labor intensity for test personnel, and long test time have emerged. The large ground grid grounding resistance tester can measure substation ground grids (4Ω), thermal and hydro power plants, microwave stations (10Ω), and lightning rods (10Ω) as a multi-purpose model. It adopts a new type of variable frequency AC power supply, and uses measures such as microprocessor control processing and signal processing, which effectively solves the anti-interference problem during the test process, simplifies the test operation process, improves the accuracy and precision of test results, and greatly reduces the labor intensity and test cost for test personnel.
Note: The above information and technical parameters are compiled and released by Yangzhou Darui Electric Co., Ltd.
