The complete set offrequency conversion series resonance test equipmentis used to change the inductance and test frequency of the testing system, so that the circuit is in a resonant state, and most of the capacitance current on the testing circuit is cancelled out by the induced current on the reactor. The energy provided by the power supply is only a small part of the resonance multiple consumed in the circuit, that is, a part of the resonance multiple of the capacity of the test piece; Therefore, the capacity of the test power supply slowly decreases, and the weight is greatly reduced. The complete set of frequency conversion series resonance test equipment system can be divided into two types according to the adjustment method: regulating type and frequency modulation type.

Belonging to the resonant current filtering circuit, it can improve the waveform distortion of the power supply, obtain a better sine voltage waveform, and effectively prevent harmonic peaks from causing false breakdown of the test sample.Variable frequency series resonanceworks in a resonant state. When the insulation point of the tested object is broken down, the current immediately loses resonance, and the circuit current quickly drops to one tenth of the normal test current. In the case of flashover breakdown, the variable frequency series resonance test device loses resonance conditions, only the short-circuit current immediately drops, the high voltage immediately disappears, and the arc is extinguished. When the flashover voltage is reached again, it is easy to disconnect the power supply. Commonly used for insulation withstand voltage testing of high-voltage and high-capacity power equipment.

The complete set offrequency conversion series resonance test equipmentis a resonant current filtering circuit that can improve the waveform distortion of the power supply, obtain a good sine voltage waveform, and effectively prevent the false breakdown of harmonic peaks on the test object. The frequency conversion series resonance works in a resonant state. When the insulation point of the test object is broken down, the current immediately loses resonance, and the circuit current quickly drops to one tenth of the normal test current. In the case of flashover breakdown, due to the loss of resonance conditions, in addition to short-circuit current, the high voltage immediately disappears and the arc can be extinguished. When the flashover voltage is reached again, it is easy to cut off the power supply, so the entire frequency conversion series resonance test device is suitable for insulation withstand voltage testing of high-voltage and large capacity power equipment.

The complete set offrequency conversion series resonance test equipmentadopts the principle of series parallel resonance. By adjusting the output frequency of the frequency conversion controller, the inductance L of the reactor in the circuit resonates with the capacitance C of the test sample. The resonance voltage is the external voltage on the test object, and the power supply is provided by the frequency modulation controller. The test voltage is initially boosted by the excitation transformer, so that the high voltage acts on the reactor L and the test object Cx. By changing the output frequency of the frequency modulation controller, the circuit is in series resonance state. The resonant frequency of the circuit depends on the capacitance CX of the tested object and the inductance L of the reactor. Adjust the output voltage of the variable frequency controller to achieve the required high voltage of the tested object.

The complete set offrequency conversion series resonance test equipmentis widely used in industries such as power, metallurgy, petroleum, and chemical, and is suitable for generators, transformers GIS、 Handover and preventive tests for high-capacity and high-voltage capacitor test items such as high-voltage cross-linked cables, transformers, and bushings. The independently developed variable frequency voltage regulation software technology in the field of variable frequency series resonance test device testing.