การพัฒนาแหล่งจ่ายแรงดันสูงกระแสสลับขนาด 5 กิโลโวลต์ 5 แอมแปร์ที่ปรับความถี่ได้ในช่วง 10 – 500 เฮิรตซ์ จากแหล่งจ่ายไฟฟ้ากระแสตรง / อธิป สุมนะไพศาล = A development of 5kV-AC high voltage, 5A. with a variable frequency in range of 10 – 500Hz. from DC high voltage supply / Atip Sumanapisan
This thesis presents the prototype of AC voltage supply which can be controlled the frequency in the range of 10 - 500 Hz from DC power supply. This uses to supply the power for high voltage electrical equipment with high capacity load such as underground high voltage cable or GIS etc. Using the AC output voltage through the resonance transformer for increasing the voltage up to 5 kV. Typically, the test system of electrical equipment on-site with 50 Hz is large, the transportation of the testing device is quiet difficult. This test system can be adjusted the frequency of AC output voltage to fit with resonance frequency with the test equipment. This reduces its primary current and size. The results from the test system can be used with the capacitor between 600pF and 48.2nF at testing voltage of 5kV. It is given the resonance frequency at 333 Hz and 45.5 Hz and provide the minimum currents from AC power supply at 637.7 mA and 3.1743 A, respectively
