A study on analysis of defects for hydro generator power transmission cables using VLF testing and diagnostic measurements

Development of a novel 20 kV 0.1 Hz very low frequency cosine‐rectangular voltage generator for multi‐functional insulation testing of MV power cables

“…There are two main ways to solve this problem. One is by reducing the frequency of the test voltage, which is the path taken in developing the very low frequency (VLF) voltage test [1][2][3]; the other is using the resonance principle, which leads to the damped oscillating voltage (DOV) test [4][5][6][7]. According to [8], both methods have their own merits and shortcomings.…”