Method of monitoring the contact burnoff in tap changers
US6518771B2 · kind B2 · utility
6Cited by
2References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 29, 2001 |
| Grant date | Feb 11, 2003 |
| Priority date | — |
| Expiry date | Jan 29, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2009/0061
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method of monitoring contact burnoff in tap changers operating under load in which the load current is measured and for nominal variation of the voltage of the particular tap parameters are stored which are used to calculate the burnoff rate per contact per switching operation. From these values the cumulative burnoff rate of both the switching contact and resistance contact are determined and compared with limits or threshold values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.