By sion932 
High voltage resonance test device? HVHIPOT specializes in the production of series resonance, with a wide range of product selection and professional electrical testing. To find series resonance, choose HVHIPOT.
The high-voltage resonance test device adopts the method of adjusting the frequency of the power supply to achieve resonance between the reactor and the tested capacitor, obtaining high voltage and high current on the tested object. It is a new method and trend of high-voltage testing, which has been widely used at home and abroad. The high-voltage resonance test device adopts a dedicated SPWM digital waveform generation chip with a frequency resolution of 16 bits, and the frequency fineness can reach 0.1Hz between 20-300Hz. It adopts an orthogonal asynchronous fixed carrier modulation method to ensure good output waveform throughout the entire frequency range; The power section adopts advanced IPM modules to ensure instrument stability and safety with minimal weight. The series high-voltage resonance test device consists of a frequency and voltage regulating power supply, an excitation transformer, a reactor, and a capacitive voltage divider.
Cables with voltage levels of 35kV and below are widely used and require a large amount of testing work. Therefore, this type of voltage withstand test device should be small in size and light in weight, giving rise to portable cable voltage withstand test systems. In this system, it is required that the weight of components that can be moved on-site by a single person does not exceed 30kg, and the weight of components that can be moved on-site by two people does not exceed 60kg, which is suitable for on-site handling; The power supply adopts 220V single-phase power supply, which is convenient for on-site power supply; The reactor part adopts dry-type epoxy casting, which is beautiful and reliable, suitable for the requirements of various types of cables.
Test method for high-voltage resonance test device
First, lower the low voltage to the resonance point of the system, then increase the amplitude of the test voltage to reach the required voltage value for the test. After maintaining this voltage for a specified period of time, lower the voltage to zero to complete the entire test process.
Working principle of high-voltage resonance test device
The power supply is provided through a variable frequency controller, and the test voltage is initially boosted by the excitation transformer to apply high voltage to the reactor L and the test sample Cx. By changing the output frequency of the variable frequency controller, the circuit is in series resonance state, and the output voltage of the variable frequency controller is adjusted to achieve the required voltage value on the high voltage of the test sample.
The resonant frequency of the circuit depends on the capacitance Cx of the test sample and the inductance L of the reactor, with a resonant frequency of f=1/(2 π√ LC).
The high-voltage resonance test device adopts 16 bit fine frequency modulation, voltage regulation software technology, 10KHz carrier frequency, SPWM, and imported original IPM integrated module design and manufacturing. With appropriate reactors, it can meet the testing range specified by national and local regulations, and the whole machine is ahead of similar domestic products.