Features of High Voltage Resonant Test Device - Yangzhou Darui
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The frequency conversion series-parallel resonant complete test device utilizes the principle of series resonance. By adjusting the output frequency of the frequency converter controller, the inductance l of the reactor in the circuit and the capacitance c of the test object undergo series resonance, and the resonant voltage is the voltage applied to the test object.
The frequency conversion series-parallel resonant test device is widely used in industries such as electric power, metallurgy, petroleum, and chemical engineering. It is suitable for capacitive test objects with large capacity and high voltage, such as generators, transformers, GIS, high-voltage cross-linked cables, instrument transformers, bushings, etc., for commissioning tests and preventive tests.
In terms of frequency conversion series-parallel resonant high-voltage testing, our company has independently developed frequency conversion and voltage regulation software technology, leading the domestic high-voltage testing industry. Using this technology, with 16-bit fine frequency conversion, 10kHz carrier frequency, SPWM, and imported original IPM integrated module design, the manufactured frequency conversion series-parallel resonant high-voltage test device fully complies with the national regulations and requirements for high-voltage testing.
Working Principle
The series resonance composed of the reactor l and the test object capacitance c has a fixed resonant frequency f=1/(2π√l·c). When the test frequency equals this frequency, the circuit resonates.
Based on this principle, the frequency conversion power supply provides power to the excitation transformer, which transforms the voltage to a medium voltage and applies it to l and the test object capacitance c. By changing the output frequency of the frequency conversion power supply, the circuit is brought into a series resonance state, and then the output voltage of the frequency conversion power supply is adjusted so that the voltage on the test object reaches the required value.
Note: The above information and technical parameters are compiled and released by Yangzhou Darui Electric Co., Ltd.
