Protection device for load circuits

Details Protection device for load circuits Protection device for load circuits

2007-04-13

2009-12-29

DeCady, Albert (Department: 2121)

Data processing: generic control systems or specific application

Specific application, apparatus or process

Specific application of temperature responsive control system

C361S024000

Reexamination Certificate

active

07640080

ABSTRACT:
A protection device protecting a load circuit by shutting off a power thereof depending on an estimated present temperature of a wire provided in the load circuit to connect a load. The protection device has a first temperature estimation device estimating a rising temperature of a conductor including the wire based on both a current in the conductor and thermal properties of the conductor, a second temperature estimation device estimating a falling temperature of the conductor based on the thermal properties, a third temperature estimation device estimating an arc-induced rising temperature of the conductor when arcing occurs in the conductor, and a fourth temperature estimation device estimating the present temperature of the conductor deduced from the above estimated temperatures. If the estimated temperature exceeds a predetermined allowable temperature, the protection device shut off the power of the load circuit.

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