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Class Information
Number: 361/81
Name: Electricity: electrical systems and devices > Safety and protection of systems and devices > With specific quantity comparison means > Voltage and current > Distance relaying > With communication means between disconnect points
Description: Subject matter wherein a communication means sends a coded message between disconnect points indicating that a fault condition exists.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7283374 |
Grow as you go equipment shelf |
Oct. 16, 2007 |
| 7102866 |
Power line protection |
Sep. 5, 2006 |
| 6947269 |
Relay-to-relay direct communication system in an electric power system |
Sep. 20, 2005 |
| 6937453 |
Directional comparison distance relay system |
Aug. 30, 2005 |
| 6914763 |
Utility control and autonomous disconnection of distributed generation from a power distribution system |
Jul. 5, 2005 |
| 6879917 |
Double-ended distance-to-fault location system using time-synchronized positive-or negative-sequence quantities |
Apr. 12, 2005 |
| 6833711 |
Protective relay for powers systems having dependable out-of-step blocking capability |
Dec. 21, 2004 |
| 6822457 |
Method of precisely determining the location of a fault on an electrical transmission system |
Nov. 23, 2004 |
| 6665162 |
Apparatus for determining failure of electromagnetic clutch |
Dec. 16, 2003 |
| 6661630 |
Distance relay for protection of transmission line having minimized reactance effect |
Dec. 9, 2003 |
| 6633166 |
Method for generating an error signal identifying a short circuit |
Oct. 14, 2003 |
| 6469629 |
Distributed logic in multiple protective relays |
Oct. 22, 2002 |
| 6459960 |
Distance relay equipment |
Oct. 1, 2002 |
| 6373670 |
Fault protection apparatus |
Apr. 16, 2002 |
| 6341055 |
Restraint-type differential relay |
Jan. 22, 2002 |
| 6226164 |
Circuit arrangement for activating warning signal generators |
May. 1, 2001 |
| 5878375 |
Data transfer switching device and method of use therefore |
Mar. 2, 1999 |
| 5786699 |
Test method and apparatus for testing a protective relay system |
Jul. 28, 1998 |
| 5666060 |
Test method and apparatus for testing a protective relay system |
Sep. 9, 1997 |
| 5642003 |
Power system switch incorporating a positive-sequence fundamental signal magnitude detector |
Jun. 24, 1997 |
| 5576625 |
Test method and apparatus for testing a protective relay system |
Nov. 19, 1996 |
| 5475558 |
Electrical power distribution device with isolation monitoring |
Dec. 12, 1995 |
| 5373411 |
Remote control circuit breaker system |
Dec. 13, 1994 |
| 5341265 |
Method and apparatus for detecting and responding to downed conductors |
Aug. 23, 1994 |
| 5317472 |
Apparatus for insuring the security of output signals from protective relays used in electric power systems |
May. 31, 1994 |
| 5164875 |
Addressable relay module for circuit breakers |
Nov. 17, 1992 |
| 4972290 |
Electric power system with remote monitoring and control of protective relays |
Nov. 20, 1990 |
| 4873601 |
Spot network type power receiving and transforming protective apparatus |
Oct. 10, 1989 |
| 4864453 |
Protective relay with selective phase selection for double lines |
Sep. 5, 1989 |
| 4855861 |
Longitudinal differential protection |
Aug. 8, 1989 |
| 4825323 |
Out-of-step blocking unit |
Apr. 25, 1989 |
| 4782421 |
Electrical supply line protection apparatus |
Nov. 1, 1988 |
| 4766549 |
Single-ended transmission line fault locator |
Aug. 23, 1988 |
| 4731689 |
Directional detection in connection with faults in a power supply network |
Mar. 15, 1988 |
| 4725914 |
Protective relay system for performing selective-pole trip determination |
Feb. 16, 1988 |
| 4700188 |
Electric power measurement system and hall effect based electric power meter for use therein |
Oct. 13, 1987 |
| 4689708 |
Zone protective directional relay scheme |
Aug. 25, 1987 |
| 4561120 |
Protective relaying system |
Dec. 24, 1985 |
| 4538196 |
Protective relay apparatus and method for providing single-pole tripping |
Aug. 27, 1985 |
| 4528611 |
Relay for pilot protection of electrical power lines |
Jul. 9, 1985 |
| 4471399 |
Power-line baseband communication system |
Sep. 11, 1984 |
| 4433353 |
Positive sequence undervoltage distance relay |
Feb. 21, 1984 |
| 4371908 |
Digital protective relaying systems |
Feb. 1, 1983 |
| 4317151 |
Apparatus for fault direction-comparison protection |
Feb. 23, 1982 |
| 4148087 |
Distance relay for electric power transmission lines |
Apr. 3, 1979 |
| 3937937 |
Primary power fault detector |
Feb. 10, 1976 |
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