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Transactions: WSEAS TRANSACTIONS ON CIRCUITS AND SYSTEMS
Transactions ID Number: 32-570
Full Name: Narong Mungkung
Position: Associate Professor
Age: ON
Sex: Male
Address: 126 Prachauthit Rd. Bangmod Thungkru Bangkok
Country: THAILAND
Tel: +66-8-510-98599
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E-mail address: narong_kmutt@hotmail.com
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Title of the Paper: An Analysis of the Instability Mechanism of a Low - Current Metal Vacuum Arc for Silver Based Cathode Material
Authors as they appear in the Paper: NARONG MUNGKUNG1 ,TANES TANITTEERAPAN1, SOMCHAI ARUNRUNGRUSMI1, WEERACHAI CHAOKUMNERD2 AND TOSHIFUMI YUJI3
Email addresses of all the authors: narong_kmutt@hotmail.com,tanes_kmutt@yahoo.com
Number of paper pages: 10
Abstract: The purpose of this research was to investigate instability phenomena in low-current metal vacuum arc using the calculation data comparison with the experimental data. The instability phenomena are characterized by noise on the current trace prior to the actual current chopping. The instability current were investigated for various electrode material. To study the parameters effecting to the stability arc factors, the parameter scan of cathode materials and ion current fraction by numerical analysis, it was found that the critical current of the stable current is highly dependent on the thermal conductivity of the cathode material. However, the thermal conductivity effect on the instability phenomena of low-current metal vacuum arc are important for low surge switching electrode material development. Therefore, the experimental of major commercial switching electrode such as Ag-Pd are performed in this study. The arc during time and the maximum arc current were fi!
xed to 8 ms and 100 A, respectively. The vacuum was maintained to about 1*10-6 Pa. The observed waveforms, instability current, chopping current are measured by the oscilloscope. As the results, the critical current of the stable current is inversely dependent on the thermal conductivity of the cathode material. This is very important result for the development of cathode materials for low-surge vacuum interrupters.
Keywords: Cathode spot model, instability, thermal conductivity, silver, electrostatic probe
EXTENSION of the file: .doc
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