Rotor thermal model for use in motor protection

Details Rotor thermal model for use in motor protection Rotor thermal model for use in motor protection

2007-01-09

2007-01-09

Sircus, Brian (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

Reexamination Certificate

active

10607804

ABSTRACT:
The protective relay for an induction motor includes a first program function which establishes a first thermal threshold value for a start condition of the motor, using a start condition thermal model. The thermal condition of the motor is determined by measuring the motor's thermal response to stimulus. A comparator compares the start condition thermal representation with the first thermal threshold value and monitors whether the first thermal threshold value is exceeded by the start condition thermal representation. A second thermal threshold value is established for a run condition of the motor, including a selected time constant which results in the time-current curves of the start and run conditions being substantially continuous. A representation of the thermal condition of the motor is then developed in response to stimulus current. A comparator then compares the run condition thermal representation with the second thermal threshold value.

REFERENCES:
patent: 4544982 (1985-10-01), Boothman et al.
patent: 4914386 (1990-04-01), Zocholl
patent: 5436784 (1995-07-01), Schweitzer et al.
patent: 5644510 (1997-07-01), Weir
patent: 5684342 (1997-11-01), Innes et al.
patent: 5761018 (1998-06-01), Blakely
patent: 5856903 (1999-01-01), Smith
patent: 5872722 (1999-02-01), Oravetz et al.

Affiliated with

Also associated with

Rating

Rotor thermal model for use in motor protection does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Rotor thermal model for use in motor protection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rotor thermal model for use in motor protection will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3779683