At present in the power system, the measurement of the ground resistance of large ground network is mainly measured by the power frequency high current tripole method. In order to prevent the interference of power frequency generated during the operation of power grid and improve the accuracy of measurement results, insulation preventive test rules stipulate that the test current of power frequency high current method shall not be less than 30 amperes. As a result, there are many problems such as bulky test equipment, complex test process, high working intensity of test personnel and long test time.
Large ground network grounding resistance tester, can measure substation ground network (4 ω), water and fire power plant, microwave station (10 ω), lightning rod (10 ω) multi-purpose model, the use of a new frequency conversion AC power supply, and the use of microcomputer processing control and signal processing measures, a good solution to the anti-interference problems in the testing process, simplify the test process, The precision and accuracy of test results are improved, and the labor intensity and test cost of test personnel are greatly reduced.
The instrument is suitable for testing the power frequency grounding impedance, contact voltage, step voltage, and other power frequency characteristic parameters of various grounding devices and soil resistivity. The instrument adopts different frequency anti-interference technology, can accurately measure the power frequency 50Hz data under the strong interference environment. The maximum test current is 5A, which will not cause the potential of the grounding device to be too high during the test. At the same time, it also has a strong anti-interference ability, so it can be measured without power failure.
Performance characteristics of large ground grid grounding resistance tester
1. The power frequency equivalence of measurement is good. The test current waveform is sinusoidal, and the difference between frequency and power frequency is only 5Hz. Two frequencies, 45Hz and 55Hz, are used for measurement.
2, strong anti-interference ability. The large ground network grounding resistance tester adopts the different frequency method to measure, with modern software and hardware filtering technology, making the instrument has high anti-interference performance, the test data is stable and reliable.
3, high precision. The basic error is only 0.005 ω, which can be used to measure large ground networks with small grounding impedance.
4. Powerful functions. Measuring current pile, voltage pile, grounding resistance, step voltage, contact voltage.
5, simple operation. Full Chinese menu operation, directly display the measurement results.
Wuhan Xinshengneng Technology Co., Ltd. specializes in the production of grounding/insulation series of test equipment, the production of a variety of products, complete models, cost-effective products, welcome to call 0312-3188565 consultation!
