US PATENT SUBCLASS 361 / 80
.~.~.~ Distance relaying

Current as of: June, 1999
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361 /   HD   ELECTRICITY: ELECTRICAL SYSTEMS AND DEVICES

1  DF  SAFETY AND PROTECTION OF SYSTEMS AND DEVICES {32}
78  DF  .~ With specific quantity comparison means {5}
79  DF  .~.~ Voltage and current {3}
80.~.~.~ Distance relaying {1}
81  DF  .~.~.~.~> With communication means between disconnect points

DEFINITION

Classification: 361/80

Distance relaying:

(under subclass 79) Subject matter wherein the voltages and currents are sensed at specific points in a system and computed with each other or with reference quantities to determine if a fault condition exists in the protected line section.

SEE OR SEARCH THIS CLASS, SUBCLASS:

67+, for distance relaying circuits in series connected sections.