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The frequency conversion resonance test device uses the principle of series resonance. By adjusting the output frequency of the frequency conversion controller, the inductance L of the reactor in the circuit and the capacitance C of the test sample undergo series resonance. The resonance voltage is the voltage applied to the test sample.
The frequency conversion resonance test device is widely used in industries such as power, metallurgy, petroleum, chemical, etc. It is suitable for high-capacity, high-voltage capacitive test samples, such as generators, transformers, etc GIS, Handover and preventive tests for high-voltage cross-linked cables, transformers, bushings, etc. Composition of Frequency Conversion Resonance Test Device
The frequency conversion resonance test device consists of a frequency conversion power supply, excitation transformer, reactor, voltage divider, and compensation capacitor.
Working principle of frequency conversion resonance test device
When the circuit frequency f=1/2 π√ LC, resonance occurs in the circuit, and the voltage on the test sample is Q times the output voltage of the excitation transformer high voltage end. Q is the system quality factor, which is the voltage resonance multiple, generally ranging from tens to hundreds or more. First, adjust the output frequency of the variable frequency power supply to induce series resonance in the circuit, and then adjust the output voltage of the variable frequency power supply under the condition of circuit resonance to achieve the test value of the sample voltage. Due to the resonance of the circuit, a smaller output voltage of the variable frequency power supply can generate a higher test voltage on the test sample CX.
Application of Frequency Conversion Resonance Test Device
1. AC voltage withstand test of 6kV-500kV high-voltage cross-linked cable
2. AC voltage withstand test of generator
3. AC withstand voltage test for GIS and SF6 switches
4. Power frequency withstand voltage test of 6kV-500kV transformer
5. AC withstand voltage test for other high-voltage electrical equipment such as busbars, bushings, and transformers.