System for transitioning to the trip threshold for the start...

Details System for transitioning to the trip threshold for the start... System for transitioning to the trip threshold for the start...

2006-10-17

2006-10-17

Jackson, Stephen W. (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

Reexamination Certificate

active

07123457

ABSTRACT:
A system used in a protective relay for motors for transitioning the value of the trip threshold to a motor start (stall) condition. The calculated transition trip threshold value follows I2t, specifically, the current to the motor. The transition trip threshold value includes a small fixed initial (offset) value, so that the increase in the trip threshold during transition to the actual start condition threshold value is always slightly ahead of the increase in the I2t value, preventing a trip until the input current exceeds the final trip threshold for the start condition.

REFERENCES:
patent: 4547826 (1985-10-01), Premerlani
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: 5706153 (1998-01-01), Innes et al.
patent: 5761018 (1998-06-01), Blakely
patent: 5872722 (1999-02-01), Oravetz et al.
patent: 2004/0264073 (2004-12-01), Zocholl

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