Title :
Determination of gas pressure in vacuum interrupter based on partial discharge
Author :
Kamarol, Mohamad ; Ohtsuka, Shinya ; Hikita, Masayuki ; Saitou, Hitoshi ; Sakaki, Masayuki
Author_Institution :
Dept. of Electr. Eng., Kyushu Inst. of Technol., Kitakyushu
fDate :
6/1/2007 12:00:00 AM
Abstract :
Partial discharge characteristics in air under a low vacuum region were studied to develop a diagnosis technique to determine the gas pressure in a vacuum interrupter. The pressures were set at from 1.3 Pa to 2.6 kPa in order to simulate the leakage of gas into the vacuum interrupter. The structure of the vacuum interrupter, the measurement and the circuit construction for the experimental setup were described. The measurement of partial discharge occurring inside the vacuum interrupter was performed with a current transformer, intensified charge coupled device (1CCD) camera and photomultiplier tube. The measurement of partial discharge light intensity with a photomultiplier tube was more sensitive compared with that measured with a current transformer. From this result, an attempt has been made to distinguish the pressure below and above 260 Pa on the basis of the rise time and peak intensity of discharge light pulses. A relatively longer rise time (2 mus) with a smaller magnitude (less than 0.5 mA) was attributed to a Townsend-like discharge at pressures below 260 Pa, while a sharper rise time ~(10-100 ns) with a larger magnitude (greater than 1 mA) was characterized as a streamer-like discharge above 260 Pa. In addition, the estimation of gas pressure in a vacuum interrupter was made based on phase-resolved discharge characteristics utilizing an artificial neural network.
Keywords :
CCD image sensors; Townsend discharge; current transformers; neural nets; partial discharge measurement; photomultipliers; power engineering computing; vacuum interrupters; Townsend-like discharge; air; artificial neural network; current transformer; diagnosis technique; gas leakage; intensified charge coupled device camera; partial discharge measurement; phase-resolved discharge characteristics; photomultiplier tube; streamer-like discharge; vacuum interrupter; Charge-coupled image sensors; Circuit simulation; Current measurement; Current transformers; Electron tubes; Interrupters; Partial discharge measurement; Partial discharges; Photomultipliers; Vacuum technology;
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
DOI :
10.1109/TDEI.2007.369518