Protection arrangement for an electrical power distribution network
US8249755B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 23, 2009 |
| Grant date | Aug 21, 2012 |
| Priority date | — |
| Expiry date | Jul 23, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/093
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Protection arrangements and methods of operating protection arrangements are important in order to maintain operability with regard to electrical power distribution networks. Such networks generally comprise grids or meshes of electrical distribution pathways from generators and electrical loads. Faults may occur within the network and circuit breakers or other protection elements are utilised to isolate such faults. A number of regimes for protection are known but problems can arise with regard to ensuring an appropriate pan of the distribution network is isolated. By providing circuit breakers which have a time grade margin compared to other circuit breakers which is proportional to an inverse current-time logarithmic relationship between a fault electrical current divided by a major contribution electrical current to the circuit breaker operation can be achieved which is sufficiently quick for high electrical fault currents but incorporates a time delay for low electrical currents which may have a more transient nature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.