Open AccessDevelopment of a compact very low frequency cosine‐rectangular and damped alternating current voltage generator for insulation testing of medium‐voltage power cables
Author(s) -
Wang Li,
Yang Saike,
Guo Xiaokai,
Sun Tingxi,
Li Hongjie,
Wu Hongxiao,
Nan Baofeng
Publication year - 2020
Publication title -
iet generation, transmission and distribution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 110
eISSN - 1751-8695
pISSN - 1751-8687
DOI - 10.1049/iet-gtd.2020.1222
Subject(s) - voltage , generator (circuit theory) , waveform , electrical engineering , power (physics) , engineering , alternating current , electronic engineering , physics , quantum mechanics
This study describes the research and design of a novel and compact very low frequency cosine‐rectangular (VLF‐CR) and damped alternating current (DAC) voltage generator that can be used to test the insulation condition of the medium‐voltage power cables. Further, a complete system based on a voltage multiplier (VM), which can be cascaded to increase the output voltage, is proposed to simultaneously realise VLF‐CR and DAC voltages for the withstand voltage and offline partial discharge (PD) tests, enabling the test system to be lightweight and efficient. The system principle and operating characteristics associated with the generation of two different voltages are analysed in detail according to the new circuit topology of the proposed generator. Furthermore, oscillation suppression and multiple output units are considered to improve the voltage waveform and provide power supply to the VM module, respectively. A laboratory prototype is also developed and tested. Finally, the integrated generator is used for the PD testing on cables with artificial defects, verifying the practicability of the proposed system.