Protective relay for power systems having fault distance...

Details Protective relay for power systems having fault distance... Protective relay for power systems having fault distance...

2008-03-18

2008-03-18

Deberadinis, Robert L. (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

Reexamination Certificate

active

07345862

ABSTRACT:
The system is used in a distance-type protective relay which includes a calculation circuit responsive to voltage and current values from a power line to produce a quantity which is analogous to the distance between the relay and a fault on the line, referred to as an m quantity. This quantity is then applied to a distance element/circuit for comparison of said quantity with a setting reach value for a zone one distance protection to determine whether the fault is within zone one protection. The system includes a filter circuit which filters the quantity before it reaches the distance element, resulting in a smoothing of said quantity and rejection of noise therefrom. The system further includes a control circuit which determines whether the filter is to be used in the system in a particular situation, depending upon whether when the value of the quantity is above a selected percentage of the setting reach value.

REFERENCES:
patent: 5784241 (1998-07-01), Munch et al.
patent: 6028754 (2000-02-01), Guzman-Casillas et al.

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