Series resonance can also be referred to as a type of testing and detection device for series resonance structures, which can be divided into frequency modulation and induction modulation. It is usually provided by power inverters, excitation transformers, reactance and capacitance dividers. The capacitor and reactor of the test sample form a series resonant network connection management method; The voltage divider is connected in parallel to the test sample to measure the resonant operating voltage on the test sample and provide an overvoltage protection environmental signal.
The variable frequency series resonant device adopts ARM and FPGA high-speed digital signal processors to achieve high-level control of the entire testing process Real time calculation of output waveform, FPGA high-speed digital signal processor, real-time change of waveform output, real-time measurement of high voltage value and main circuit parameters of inverter power supply
As for large capacity and high-voltage electrical equipment, the recommended insulation performance for frequency voltage detection does not include the power supply preventive testing of the DC high-voltage generator required for testing the insulation of electrical equipment, which belongs to a destructive test. However, after long-term research, the stability of power frequency voltage and DC voltage is better for safety, because power equipment, high voltage, often cannot meet the capacity requirements of a power frequency withstand test equipment for oil immersed transformers. In order to achieve this goal, the basic measurement is achieved by series resonant frequency.
Variable frequency series resonance, also known as "frequency conversion", can generate resonance conditions in a series resonance circuit by adjusting the variable frequency range. "Series" refers to the connection management method in the entire design circuit of the enterprise. When connected in series, the voltage is added and the current remains unchanged. "Resonance" refers to the resonant circuit. The combination and development of learning are due to the series resonance test and detection device that we commonly refer to now.
Test conditions for series resonance
When we obtain a pilot project, we need to analyze what the main experiments are, such as power cables, transformers, GIS combinations or buses, whether they apply the same voltage to different contents, are they also a transformer, and the neutral ungrounded and grounded voltage levels are different. Different wiring, voltage, and capacity configuration schemes directly affect the series resonance test device, and the program is arranged and connected in a series? How to string? In summary, in order to develop a series resonance, the condition is that when the capacitance is equal to the inductance, the resonance condition can be affected by the generated capacitance.