Microprocessor-based stand-alone digital protective relay...

Details Microprocessor-based stand-alone digital protective relay... Microprocessor-based stand-alone digital protective relay...

Category

H - Electricity

Subcategory

02

Subsubcategory

H

CPC

324/17, 317/7

IPC codes

H02H 7/04 (2006.01)

Type

Patent

Patent number

CA 2018938

Description

A stand alone protective apparatus and method is provided for electrical power devices. Power devices can be damaged due to conditions for example of over current, magnetizing in rush-current, over excitation voltage, saturation, ground fault or internal faults. To protect power devices from the noted conditions, electrical current of the power device is sensed and sampled. Digital processing is used for analyzing the digitally coded sample current and based on one of the conditions that can cause damage, a signal is provided for selectively actuating, by tripping an electric/electronic circuit breaker.

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