| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2012: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2011: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Research Abstract |
Gas circuit breakers (GCBs) are one of the most important components for high voltage power system. For high voltage circuit breaker rated at more than 72 kV, high-pressure SF6 gas is commonly used as arc quenching medium. However, SF6 has very high global warming potential. It has thus been desired to search for alternative gases for SF6. For effective searching and/or development of such alternative gases, diagnostics of arc discharges generated inside GCBs are essentially crucial. Especially, precise measurements of electron density in a decaying arc discharge in transient state are indispensable.
In order to measure electron density in arcs, in this study, laser Thomson scattering has been applied to arcs generated with several types of gases and polymer materials, which are used around electrodes. As a result of the measurement, clear differences of spatiotemporal evolutions were found for arcs generated with different conditions.
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