Voltage non-linear resistor for gapped lightning arrestors and m

Details Voltage non-linear resistor for gapped lightning arrestors and m Voltage non-linear resistor for gapped lightning arrestors and m

1991-02-19

1992-04-21

Lateef, Marvin M.

Electrical resistors

Resistance value responsive to a condition

Current and/or voltage

296101, 252521, 361128, H01C 710

Patent

active

051072424

ABSTRACT:
An excellent voltage non-linear resistor for use in a gapped lightning arrestor having a composition containing 1 0.5-1.2 mole % of bismuth oxide calculated as Bi.sub.2 O.sub.3, 2 0.3-1.5 mole % of cobalt oxide calculated as Co.sub.2 O.sub.3, 3 0.2-0.8 mole % of manganese oxide calculated as MnO.sub.2, 4 0.5-1.5 mole % of antimony oxide calculated as Sb.sub.2 O.sub.3, 5 0.1-1.5 mole % of chromium oxide calculated as Cr.sub.2 O.sub.3, 6 0.6-2.0 mole % of silicon oxide calculated as SiO.sub.2, 7 0.8-2.5 mole % of nickel oxide calculated as NiO, 8 0.004-0.04 mole % of aluminum oxide calculated as Al.sub.2 O.sub.3, 0.0001-0.05 mole % of boron oxide calculated as B.sub.2 O.sub.3 , 10.circle. 0.001-0.05 mole % of silver oxide calculated as Ag.sub.2 O, and 11.circle. the rest of zinc oxide, 12.circle. a limited current of 250-350 V/mm at a current density of 0.1 A/cm.sup.2 calculated per unit thickness of the sintered resistor, 13.circle. a limited current ratio of V.sub.0.1A /V.sub.0.1mA of 1.2-1.7 at current densities of 0.1 A/cm.sup.2 and 0.1 mA/cm.sup.2, and 14.circle. a deterioration rate of limited current of not more than 3% at a current density of 0.1 A/cm.sup.2 before and after applying twice a lightning surge current (4/10 .mu.s wave form) of 5 KA/cm.sup.2 per unit surface area.

REFERENCES:
patent: 3811103 (1974-05-01), Matsuoka et al.
patent: 3962144 (1976-06-01), Matsuura et al.
patent: 4290041 (1981-09-01), Utsumi et al.
patent: 4386021 (1983-05-01), Kazuo et al.
patent: 4551268 (1985-11-01), Eda et al.
patent: 5039971 (1991-08-01), Imai et al.

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