Method and apparatus for detecting deterioration of lightning arrester
US8669769B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 8, 2010 |
| Grant date | Mar 11, 2014 |
| Priority date | — |
| Expiry date | Aug 26, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01C7/12
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An apparatus for detecting deterioration of a lightning arrester includes: a high-frequency power supply; a pair of detecting terminals 12 connected to the high-frequency power supply via a resistance for measurement and touched to the terminals of the arrester; a voltage detecting circuit for obtaining a terminal voltage of the resistance for measurement when the detecting terminals touch the terminals of the arrester; and a determining circuit for comparing the detected voltage with a reference value to determine whether the detected voltage is good or bad. A voltage having a frequency sufficiently higher than the operation frequency of a power line is generated by the high-frequency power supply and applied to the arrester, and change in electrical characteristics due to deterioration of zinc oxide elements is detected as change in current including capacitive current, and then it is determined whether the detected change is good or bad.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.