Phase angle drift method for loss of mains/grid protection
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Apr 26, 2016
Grant Date -
Oct 25, 2012
app pub date -
Sep 30, 2009
filing date -
Sep 30, 2009
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A phase angle drift method for loss of mains/grid protection is disclosed. According to one aspect, an accumulated electrical phase angle drift derived from the difference between the current measured local frequency and the estimated frequency using historical data is compared to an angle threshold. An estimated grid frequency may be calculated based on the historical delay, and the window, over which the estimated frequency is calculated. An addition/subtraction of a phase angle offset value is calculated for a half cycle is performed when the frequency difference between the estimated frequency fnest and the measured frequency fn is greater or equal to a first determined value.
First Claim
Family
International Classification(s)
- [Classification Symbol]
- [Patents Count]
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully