Title:
【発明の名称】ギャップ付避雷器用電圧非直線抵抗体とその製造方法
Document Type and Number:
Japanese Patent JP2572881
Kind Code:
B2
Abstract:
An excellent voltage non-linear resistor for use in a gapped lightning arrestor having a composition containing 1/ &cir& 0.5-1.2 mole % of bismuth oxide calculated as Bi2O3, 2/ &cir& 0.3-1.5 mole % of cobalt oxide calculated as Co2O3, 3/ &cir& 0.2-0.8 mole % of manganese oxide calculated as MnO2, 4/ &cir& 0.5-1.5 mole % of antimony oxide calculated as Sb2O3, 5/ &cir& 0.1-1.5 mole % of chromium oxide calculated as Cr2O3, 6/ &cir& 0.6-2.0 mole % of silicon oxide calculated as SiO2, 7/ &cir& 0.8-2.5 mole % of nickel oxide calculated as NiO, 8/ &cir& 0.004-0.04 mole % of aluminum oxide calculated as Al2O3, 9/ &cir& 0.0001-0.05 mole % of boron oxide calculated as B2O3, @ 0.001-0.05 mole % of silver oxide calculated as Ag2O, and @ the rest of zinc oxide, @ a limited current of 250-350 V/mm at a current density of 0.1 A/cm<2> calculated per unit thickness of the sintered resistor, @ a limited current ratio V0.1A/V0.1mA of 1.2-1.7 at current densities of 0.1 A/cm<2> and 0.1 mA/cm<2>, and @ a deterioration rate of limited current of not more than 3% at a current density of 0.1 A/cm<2> before and after applying twice a lightning surge current (4/10 mu s wave form) of 5 KA/cm<2> per unit surface area, is provided which has superior voltage-current characteristic property, cut-off property of follow current, lightning surge discharge current withstanding capability, switching surge discharge current withstanding capability, insulation cooperative property with the arc horn, and prolonged electric life, and which can shorten the length of the limited current element portion of the gapped lightning arrestor.
Inventors:
IMAI OSAMU
SATO RITSU
OOHIRA KUNIO
SATO RITSU
OOHIRA KUNIO
Application Number:
JP21720590A
Publication Date:
January 16, 1997
Filing Date:
August 20, 1990
Export Citation:
Assignee:
NGK INSULATORS LTD
International Classes:
H01C17/00; H01C7/112; H01C7/12; (IPC1-7): H01C7/12; H01C17/00
Domestic Patent References:
| JP5676504A | ||||
| JP1228105A | ||||
| JP4100201A | ||||
| JP4116901A | ||||
| JP4117901A | ||||
| JP6159703A | ||||
| JP60164782U |
Attorney, Agent or Firm:
Akihide Sugimura (5 outside)