High speed, selective protective relays
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 24, 2000
Grant Date -
N/A
app pub date -
Jan 21, 1999
filing date -
Jan 21, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A protective relay receives current and voltage inputs, digitizes them and reduces the effects of high and low frequency noise. In the case of a distance relay, incorporated in the relay is a signal generator which generates 'operate' and 'restraint' sinusoidal signals. In the case of a current or voltage relay, operate is a digitized version of current (voltage) and restraint is a pre-specified constant. In all cases, a magnitude comparator, implemented using short (two sample) data window algorithms, compares the magnitude of the operate and restraint signals and outputs a trip condition signal. The trip condition output is limited to a finite number of values by a limiter system and sent to an adaptive trip counter system. The adaptive trip counter system employs trip counter processing, which determines whether a trip signal will be initiated, immediately or after a period of delay.
First Claim
Family
International Classification(s)
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