Wuhan UHV specializes in the production of series resonance (also known as variable frequency series resonance test device). Next, we will share with you the adjustable capacity power frequency series resonance AC withstand voltage test device.
The adjustable capacitance series resonant AC withstand voltage test device is a device that adjusts the tuning capacitor in the test circuit and cooperates with the fixed tuning inductor in the circuit to cause resonance of the entire test circuit at the power frequency (50Hz).
B1: Voltage regulator
B2: Excitation Transformer
L: Reactor
CX: Sample capacitor
C: Tuning capacitor
C1, C2: Voltage divider capacitors
Reactors and tuning capacitors are usually composed of several sections, and can be subjected to AC withstand voltage tests of different voltage levels through different combinations. The main features of the adjustable capacity power frequency series resonant AC withstand voltage test device are:
(a) Lightweight, requires small power capacity, and outputs 50Hz power frequency voltage.
(b) The resonant frequency of the experimental device is fixed at 50Hz, and the combination of fixed inductance and tuning capacitance is adjusted to achieve resonance in the experimental circuit. Due to the fixed inductance and capacitance of each tuning inductor and tuning capacitor, different combinations can only be used to make the inductance and capacitance values of the test circuit as equal as possible. Therefore, adjustment is not very convenient and the quality factor is relatively low (generally less than 40).
(c) The device adopts unidirectional power supply and requires a large input current.
(d) The frequency of the test power supply is fixed at 50Hz, and a portable autotransformer is used to regulate the input voltage. Since the capacity of the regulator is not large, it is required that the capacity of the test sample should not be too large, and the waveform of the test voltage should be slightly distorted.
(e) The volume of inductors is relatively large.
(f) Suitable for AC withstand voltage testing of samples with small capacitance.
(g) The regulator in the device has moving parts and a short mechanical lifespan.