Variable frequency resonant high voltage test device? 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 resonant high-voltage test device utilizes the inductance of a reactor and the capacitance of the test object to achieve capacitance resonance, obtaining high voltage and high current on the test object. It is a new method and trend in high-voltage testing and has been widely used both domestically and internationally.
The variable frequency resonant high voltage test device is a resonant current filtering circuit that can improve power waveform distortion, obtain better sine voltage waveform, and effectively prevent harmonic peak values from causing false breakdown of the test sample. Variable frequency series resonance works in a resonant state. When the insulation point of the test sample is broken down, the current immediately becomes detuned, and the circuit current rapidly drops to one tenth of the normal test current. When flashover breakdown occurs, due to the loss of resonance conditions, in addition to the immediate decrease in short-circuit current, the high voltage also disappears immediately, and the arc can be extinguished. The process of restoring voltage is very long, and it is easy to disconnect the power supply when the flashover voltage is reached again. Therefore, it is suitable for insulation withstand voltage tests of high-voltage and large capacity power equipment, such as GIS substations, high-voltage cross-linked power cables, generators, large transformers, isolation switches, transformers, etc.
Working principle of frequency conversion resonance high-voltage test device
By adjusting the output frequency of the variable frequency controller, resonance occurs between the inductance L of the reactor in the circuit and the capacitance C of the test sample, and the resonance voltage is the voltage applied to the test sample. The power supply is provided through the frequency modulation 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 frequency modulation controller, the circuit is in series resonance state; The resonant frequency of the circuit depends on the capacitance CX of the test sample and the inductance L of the reactor. Adjust the output voltage of the variable frequency controller to achieve the required voltage value of the high voltage on the test sample.
Product characteristics of variable frequency resonant high voltage test device
The large screen displays test data and test status, and has real-time operation step prompt function
Can flexibly adjust the experimental voltage, frequency range, and pressurization time
The test results can calculate the capacitance of the test sample
Equipped with computer communication interface for easy communication and management of experimental data
Small size, light weight, easy operation
High resolution, frequency resolution of 0.001HZ
High safety and reliability, the system has overcurrent, overvoltage, and discharge protection functions, which can effectively protect personal and equipment safety. The test results can be printed and upgraded with software
