Pilot frequency heavy-current multifunctional grounding parameter testing system based on variable frequency power supply

Abstract

The invention relates to a pilot frequency heavy-current multifunctional grounding parameter testing system based on a variable frequency power supply, belonging to a testing device of a grounding parameter of a transformer substation ground network. The system mainly comprises a variable frequency power supply unit and a boosting transformer unit, wherein the variable frequency power supply unit is formed by connecting two pushoff amplification type variable frequency power supplies in parallel, and the rated input voltage of each variable frequency power supply adopts a 380V+ / -10 percent and 50Hz three-phase alternating current, and outputs continuous and adjustable sine waves between 0V and 350V; and output frequency is continuous and adjustable between 20Hz and 30Hz; the boosting transformer unit consists of a boosting transformer, a primary coil of the boosting transformer is connected with two output ends of the variable frequency power supply unit, and a secondary coil of the boosting transformer is connected with the ground network of the transformer substation; and the rated volume of the boosting transformer is 15kVA, the output voltage is 200V, 400V, 600V, 800B or 1,000V, and the preset frequency is 20-300Hz. The system has the characteristics of strong ant-jamming capacity and high measurement accuracy.

Description

technical field [0001] The invention relates to a testing device for grounding parameters of a grounding system, in particular to a multi-functional grounding parameter testing system with different frequencies and large currents based on parallel variable frequency power supply technology, which is applied to testing the grounding parameters of large-scale grounding grids in electric power systems. Background technique [0002] The ground network of power plants and substations plays an extremely important role in the safe and stable operation of the power system. When a short-circuit fault occurs in the system, a strong short-circuit current flows through the ground grid to increase the ground potential of the ground grid. If there are problems such as large ground grid ground impedance, unreasonable ground potential distribution, corrosion, and disconnection, the increase in ground potential may It will endanger the safety of equipment and personnel. [0003] In the proc...

AI Technical Summary

Problems solved by technology

As a result, there are problems such as heavy test equipment, complicated test process, high work intensity of test personnel, and long test cycle.

[0004] Although the instruments commonly used in the market for testing grounding parameters by the different frequency method have the advantages of strong anti-interference ability, stable test data, and portable test equipment, their test current is low and they cannot accurately measure the field surface potential gradient, contact potential difference, and cross-circuit. Step voltage difference and other parameters

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