Short-circuit remaining life diagnosis method and short-circuit remaining life diagnosis system for power distribution equipment

摘要

Provided are a short circuit remaining life diagnosis method and a short circuit remaining life diagnosis system capable of accurately diagnosing a short circuit remaining life of a power receiving and distribution apparatus including an insulator. Step S10 for deriving a first time-dependent curve of the surface change rate of the insulator due to environmental factors based on the derived time-dependent equation, and the nitrate ion adhesion amount due to the calculated discharge and the nitrate ion adhesion due to the environment Step S15 for deriving a second time-dependent curve of the surface resistivity of the insulator due to the discharge factor based on the amount, the sulfate ion adhesion amount and the color parameter of the insulator, and based on the second time-dependent curve Step S16 for calculating the remaining short circuit life from the calculated surface resistivity of the insulator and a predetermined short-circuit threshold.