Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1992-03-30
1993-10-19
Scott, J. R.
Electricity: circuit makers and breakers
Liquid contact
Time delay
338 20, 338 21, H01C 710, H01H 3316
Patent
active
052548163
ABSTRACT:
According to this invention, there is disclosed a compact power circuit breaker having a large breaking capacity and stable breaking performance due to a compact closing resistor unit having high performance. The power circuit breaker includes a main switching mechanism having an arc extinguishing function, an auxiliary switching mechanism parallelly connected to the main switching mechanism and having an arc extinguishing function, and a closing resistor unit connected in series with the auxiliary switching mechanism and incorporated with a resistor containing zinc oxide (ZnO) as a main component and titanium figured out as titanium oxide (TiO.sub.2) in an amount of 0.5 to 25 mol% and nickel figured out as nickel oxide (NiO) in an amount of 0.5 to 30 mol. % as sub-components.
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Solid-State Electronics, vol. 6, pp. 111-120, 1963, R. H. Pry, et al., "Positive Temperature Coefficient of Electrical Resistivity in Some ZnO--TiO.sub.2 --NiO Ceramics".
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Andoh Hideyasu
Endo Hiroshi
Imai Motomasa
Kozuka Shoji
Mitsuishi Iwao
Kabushiki Kaisha Toshiba
Scott J. R.
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