3 phase electric leakage current circuit breaker with electric shock protection
US9923361B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 23, 2014 |
| Grant date | Mar 20, 2018 |
| Priority date | — |
| Expiry date | Apr 20, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/33
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a 3 phase electric leakage current circuit breaker with electric shock protection having a first function of detecting a leakage current and operating a circuit breaker to break an electric path if a leakage current exceeds a tolerance and a second function of detecting a leakage current every half cycle intervals of a power source, subtracting two leakage currents detected before and after a half cycle interval from each other as a vector calculus to compute a leakage current change, and operating a circuit breaker to break an electric path if the leakage current change exceeds a tolerance. The former case corresponds to protection against a normal leakage current which gradually increases, and an allowable leakage current is several hundreds of mA. The latter case is for protection against electric shock to a human body when a leakage current abruptly changes due to electric shock to a human body or the like, and an allowable leakage current is several tens of mA. Therefore, along the 3 phase electric path, the electric leakage current circuit breaker of the present invention may operate without any malfunction with respect to the normal leakage c…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.