Electric transmission line ground fault prevention methods using multi-parameter high sensitivity monitoring
US11965924B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 28, 2023 |
| Grant date | Apr 23, 2024 |
| Priority date | — |
| Expiry date | Jul 28, 2043 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H7/26
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for preventing ground fault in a three-phase electric transmission line system caused by a line break, includes: providing a programmable relay protection system, including a plurality of relay devices on each line, programmed to include: monitoring of acceptable preset parameter ranges of at least three pairs electric operating conditions, that include at least one high sensitivity instantaneous undercurrent and at least one high sensitivity condition selected from line differential overcurrent and negative sequence instantaneous overcurrent, zero sequence instantaneous overcurrent, and change in instantaneous undercurrent (and combinations thereof); permitting closed circuit operation when all of the lines show that the operating conditions are within the preset acceptable ranges; tripping a circuit breaker on a broken line when that line shows two operating conditions outside the preset parameter ranges; and shutting down power to the broken line before it otherwise causes a ground fault or other short circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.