Development of environmental-friendly arc quenching medium alternative to SF_6 using pulse modulated induction plasma

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1) Effect of gas inclusion on stable operation region of pulse-modulated induction thermal plasmaStable operation region of pulse-modulated induction thermal plasma(PMITP) highly depends on added gas, which is related to plasma-quenching ability of gases. In order to investigate plasma-quenching ability of various gases, Four kinds of environmentally-benign gases such as N_2, H_2, Q_2 and CO_2 was injected into Ar PMITP. The results indicates that inclusion of CO_2 decays drastically the stable operation region of PMITP. This means that CO_2 has a higher plasma-quenching ability compared with the other gases treated in the experiment.2) Effect of gas inclusion on transient behavior of pulse-modulated induction thermal plasmaGas inclusion affect transient behavior of PMITP, which is also markedly related with plasma-quenching ability of gases. We measured time evolution of radiation intensity of Ar line emitted from PMITP with added gases. As a result, CO_2 inclusion made transient behavior of PMITP delayed. This also indicates that CO_2 has high plasma-quenching ability.3) Effect of gas inclusion on time variation in Ar excitation temperatureThe time-resolved radiation intensity measurement permitted us to estimate Ar excitation temperature of PMITP. Two-line method of Ar spectral line was used for this temperature estimation. The results revealed that CO_2 inclusions decayed Ar excitation temperature markedly compared with the other gases.4) Temperature measurement of laser-induced plasmaIn order to study the dielectric strength of high-temperature gas, laser-induced plasma technique was adopted. Temperature was evaluated from Boltzmann plot method on the assumption of local thermal equilibrium. From the result, laser-induced plasma temperature can be estimated.