At the circuit frequency, 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.
The voltage withstand test is carried out using the method of variable frequency series resonance. Multiple reactors can be used in parallel or series in a multi-stage stacking manner, and the voltage divider is used to measure the test voltage.
Do you know the formula for series resonance?
When the series resonance occurs, the imaginary part of the impedance of the circuit is equal to 0, Z=R+jX, X=0, Z=R, so I=U/Z=U/R.
1. Resonance definition: The energy of components L and C in a circuit is equal. When energy is released by one of the reactive components in the circuit, and the other reactive component must absorb the same energy, an energy pulsation will occur between these two reactive components.
2. To generate resonance in a circuit, it must have two components: an inductor L and a capacitor C.
3. The corresponding frequency during resonance is the resonance frequency, also known as the resonant frequency, represented by fr.
4. The condition for a series resonant circuit is as follows: When I2XL=I2XC, that is, XL=XC, it is the condition for the R-L-C series circuit to resonate.
5. Whether in series or parallel resonance, complete energy exchange is achieved between L and C during resonance. The released magnetic energy is completely converted into electric field energy and stored in the capacitor; At another moment, the capacitor discharges and converts it into magnetic energy, which is stored by the inductor.
6. In a series resonant circuit, due to the same current flowing through series - L and C, energy exchange occurs through changes in voltage polarity; In a parallel circuit, the two ends of L and C have the same voltage, so the conversion of energy is manifested as two components with opposite current phases.
7. Inductance and capacitance are still two separate components during resonance, otherwise energy exchange cannot occur; But from the perspective of equivalent impedance, it has become a component: a resistor with a value of zero or infinity.
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