Protection relay

Details Protection relay Protection relay

2005-06-14

2005-06-14

Reichard, Dean A. (Department: 2831)

Electricity: electrical systems and devices

Safety and protection of systems and devices

High voltage dissipation

C361S118000, C361S120000, C361S093100, C361S054000

Reexamination Certificate

active

06906903

ABSTRACT:
A protection relay for determining whether or not a fault point of a power system exists in a predetermined range including a filter section for inputting sampling data of a voltage and a current in the power system to a digital filter having a predetermined transfer function and outputting a first voltage data and a first current data, and a second voltage data and a second current data normal to the first voltage data and the first current data, respectively, a calculator for calculating a predetermined measurement value based on the first and second voltage data, and the first and second current data at a first time and the first and second voltage data, and the first and second current data at a second time different from the first time, and an operation decision section for performing an operation decision based on the predetermined measurement value obtained by the calculator.

REFERENCES:
patent: 3976920 (1976-08-01), Eriksson et al.
patent: 4093977 (1978-06-01), Wilson
patent: 5796630 (1998-08-01), Maeda et al.
patent: 6473723 (2002-10-01), Cheng
patent: 0718949 (1996-06-01), None

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