Variable frequency series resonance withstand voltage? Wuhan UHV specializes in the production of series resonance, with a wide range of product selection and professional electrical testing. To find series resonance, choose Wuhan UHV.
The variable frequency series resonant withstand voltage device uses the principle of series resonance, excites the series resonant circuit with an excitation transformer, adjusts the output frequency of the variable frequency controller, and causes the circuit inductance L and the test sample C to resonate in series. The resonant voltage is the voltage applied to the test sample. The complete set of variable frequency series resonance equipment is widely used in industries such as power, metallurgy, petroleum, and chemical engineering, and is suitable for the handover and preventive testing of high-capacity, high-voltage capacitive samples.
The variable frequency series resonant withstand voltage device mainly consists of a variable frequency controller, excitation transformer, high-voltage reactor, high-voltage voltage divider, etc. Variable frequency controllers are divided into two categories: desktop controllers with 20KW and above, and portable box controllers with 20KW and below; The complete set of variable frequency series resonance equipment consists of a controller and a filter. The main function of a variable frequency controller is to convert a 380V or 200V AC power frequency sine wave with fixed amplitude and frequency into a sine wave with adjustable amplitude and frequency. And provide power for the entire equipment. The function of the excitation transformer is to raise the voltage output by the variable frequency power supply to the appropriate test voltage. The high-voltage reactor L is an important component of the resonant circuit. When the power frequency is equal to 1/(2 π√ LCX), it undergoes series resonance with the test sample CX.
The frequency conversion series resonant withstand voltage device adopts a multi-stage superposition method, and multiple reactors can be used in parallel or series. The voltage divider is used to measure the test voltage and can also be used as a compensation capacitor for small capacitance test samples, allowing the resonant frequency to complete AC withstand voltage tests for various power equipment within the range of 30-300Hz. The basic principle of variable frequency series resonance is to use adjustable (30-300Hz) series resonance test equipment to resonate with the capacitor of the test object to generate an AC test voltage.
Principle of Frequency Conversion Series Resonance Voltage Endurance
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.