System, device, and method for over-current relays protecting motors
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United States of America Patent
Stats
-
May 26, 2009
Grant Date -
May 10, 2007
app pub date -
Oct 4, 2006
filing date -
Oct 17, 2005
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A system, method, and device for protecting an induction motor are disclosed. The exemplary system may have a module for determining the current drawn by the motor and a module for determining the state of the motor. The system may calculate a used thermal capacity based on a first formula when the motor is in an active state. The system also calculates the used thermal capacity based on a second formula when the motor is in an inactive state. When the used thermal capacity attains a threshold, the relay is tripped thus removing current to the motor and preventing motor from overheating. A method to derive thermal time constants from desired trip time limits (such as those defined by IEC standards or the thermal limit curves provided by motor manufacturers) is also presented. For example, the thermal time constants can then be used in tacking motor used thermal capacity throughout various motor states.
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Cited Art Landscape
Patent Citation Ranking
- 1 Citation Count
- H02H Class
- 3.80 % this patent is cited more than
- 16 Age
