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Class Information
Number: 324/524
Name: Electricity: measuring and testing > Fault detecting in electric circuits and of electric components > For fault location > By voltage or current measuring > Polarity responsive
Description: Subject matter where direction or distance to a fault is determined by a positive or negative signal.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7183773 |
Method and circuit arrangement for the self-testing of a reference voltage in electronic components |
Feb. 27, 2007 |
| 7174255 |
Self-processing integrated damage assessment sensor for structural health monitoring |
Feb. 6, 2007 |
| 7157896 |
Device for locating and identifying circuit breakers |
Jan. 2, 2007 |
| 7068044 |
Cable tester |
Jun. 27, 2006 |
| 6873158 |
Circuit protection device with half cycle self test |
Mar. 29, 2005 |
| 6844737 |
Device and process for detecting an electrical short-circuit, and circuit breaker comprising such a device |
Jan. 18, 2005 |
| 6794883 |
Method and system for monitoring winding insulation resistance |
Sep. 21, 2004 |
| 6674289 |
Circuit protection device with half cycle self test |
Jan. 6, 2004 |
| 6518769 |
Method and device for the electrical monitoring of an electrode lead of a bipolar high-voltage D.C. transmission system |
Feb. 11, 2003 |
| 6518768 |
Arrangement, method, and current measurement device for measuring a current in a conductor |
Feb. 11, 2003 |
| 6501277 |
Automotive harness and audio system analyzer |
Dec. 31, 2002 |
| 6141093 |
Method and apparatus for locating power plane shorts using polarized light microscopy |
Oct. 31, 2000 |
| 5933012 |
Device for sensing of electric discharges in a test object |
Aug. 3, 1999 |
| 5912514 |
Uninterruptible power supply unit |
Jun. 15, 1999 |
| 5847423 |
Semiconductor device having a thin film capacitor and a resistance measuring element |
Dec. 8, 1998 |
| 5796259 |
Methods and apparatus for detection of fault direction |
Aug. 18, 1998 |
| 5760591 |
Method of and apparatus for determining an electric wiring state |
Jun. 2, 1998 |
| 5708364 |
Cable monitoring system with multiple branch terminations |
Jan. 13, 1998 |
| 5694044 |
Simultaneous surge test of two coils of an assembly of series connected coils |
Dec. 2, 1997 |
| 5646462 |
DC voltage bypass power system architecture |
Jul. 8, 1997 |
| 5502375 |
Method and apparatus for determining orientation of polarized capacitors |
Mar. 26, 1996 |
| 5365438 |
Audible and visual feedback for user stimulated self-test diagnostics |
Nov. 15, 1994 |
| 5347225 |
Network monitor and test apparatus |
Sep. 13, 1994 |
| 5325061 |
Computationally-efficient distance relay for power transmission lines |
Jun. 28, 1994 |
| 5245289 |
Circuit breaker interrupter sequence monitor |
Sep. 14, 1993 |
| 5087874 |
Apparatus and method for locating a short |
Feb. 11, 1992 |
| 4884033 |
Diagnostic test apparatus for electrical system of automotive vehicle |
Nov. 28, 1989 |
| 4833414 |
Method and apparatus for the identification of a faulty conductor in a multiple supply line |
May. 23, 1989 |
| 4764727 |
Circuit continuity and voltage tester |
Aug. 16, 1988 |
| 4591992 |
Method and system for identifying the direction of a fault in a power line |
May. 27, 1986 |
| 4562401 |
Circuit arrangement and method for fault locating in conjunction with equipment for the trunk feeding of electrical loads |
Dec. 31, 1985 |
| 4458198 |
Fault indicator having a remote test point at which fault occurrence is indicated by change in magnetic state |
Jul. 3, 1984 |
| 4445085 |
Fault location methods and apparatus using current pulse injection |
Apr. 24, 1984 |
| 4438403 |
Fault indicator with combined trip and reset winding |
Mar. 20, 1984 |
| 4385271 |
Fault monitoring by detecting a polarity difference |
May. 24, 1983 |
| 4377782 |
Fault location methods and apparatus using current pulse injection |
Mar. 22, 1983 |
| 4377834 |
Multiphase blocking circuitry for electrical power supply networks |
Mar. 22, 1983 |
| 4351011 |
Directional wave detector apparatus |
Sep. 21, 1982 |
| 4345201 |
Fault location system with enhanced noise immunity |
Aug. 17, 1982 |
| 4311576 |
Electric corrosion preventing apparatus |
Jan. 19, 1982 |
| 4187461 |
Dynamic threshold impulse directivity indicator |
Feb. 5, 1980 |
| 4148087 |
Distance relay for electric power transmission lines |
Apr. 3, 1979 |
| 4063171 |
Fault indicator responsive to flow of fault current in a conductor when power flow is in one direction only |
Dec. 13, 1977 |
| 4023154 |
Apparatus for detecting location of metal cable failure |
May. 10, 1977 |
| 4001686 |
Electronic circuit testing apparatus |
Jan. 4, 1977 |
| 3986115 |
Transient direction detector |
Oct. 12, 1976 |
| 3986116 |
Transient source and direction of propagation detector |
Oct. 12, 1976 |
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