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Class Information
Number: 340/646
Name: Communications: electrical > Condition responsive indicating system > Specific condition > Condition of electrical apparatus > Transformer
Description: Subject matter where the monitored device is a transformer.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7336193 |
Device for monitoring the leakage current of a surge arrester |
Feb. 26, 2008 |
| 7310049 |
Status indicator |
Dec. 18, 2007 |
| 6972686 |
Radiated field detector |
Dec. 6, 2005 |
| 6906630 |
Transformer management system and method |
Jun. 14, 2005 |
| 6842718 |
Intelligent auxiliary cooling system |
Jan. 11, 2005 |
| 6727821 |
Apparatus and method for predicting an overload trip for an electrical power transformer |
Apr. 27, 2004 |
| 6714022 |
Apparatus and method for cooling power transformers |
Mar. 30, 2004 |
| 6680616 |
In-service testing of current transformers |
Jan. 20, 2004 |
| 6609079 |
Method and arrangement for ascertaining state variables |
Aug. 19, 2003 |
| 6424266 |
Apparatus for preventing thermal damage to an electrical power transformer |
Jul. 23, 2002 |
| 6400277 |
Monitor for detecting failures of neon sign transformers |
Jun. 4, 2002 |
| 6323655 |
Method and device for detecting partial discharges |
Nov. 27, 2001 |
| 6292069 |
Loosely coupled rotary transformer having resonant circuit |
Sep. 18, 2001 |
| 6052060 |
Temperature monitor for electrical switchgear |
Apr. 18, 2000 |
| 6016104 |
System for controlling the resistance of a load connected to a transformer |
Jan. 18, 2000 |
| 5949343 |
Supervisory apparatus for oil-filled electrical equipment |
Sep. 7, 1999 |
| 5908453 |
Traveling control apparatus for electric vehicles |
Jun. 1, 1999 |
| 5717338 |
Method and apparatus for testing television yokes and flyback transformers |
Feb. 10, 1998 |
| 5710542 |
Method of measuring the A.C. current in a conductor in an A.C. power transmission network |
Jan. 20, 1998 |
| 5691706 |
Transformer leak alarm |
Nov. 25, 1997 |
| 5681666 |
Light transparent multilayer moisture barrier for electrochemical celltester and cell employing same |
Oct. 28, 1997 |
| 5581173 |
Microcontroller-based tap changer controller employing half-wave digitization of A.C. signals |
Dec. 3, 1996 |
| 5546010 |
Method for measuring a resistance value in an electrical apparatus |
Aug. 13, 1996 |
| 5534853 |
Electronic apparatus for measuring the parameters of an oil transformer |
Jul. 9, 1996 |
| 5522252 |
Device detecting excessive wear of a carbon wiper of an autotransformer |
Jun. 4, 1996 |
| 5500598 |
Apparatus for testing electrical components which have windings |
Mar. 19, 1996 |
| 5475371 |
Faulted circuit detector having isolated indicator |
Dec. 12, 1995 |
| 5455506 |
Method and portable testing apparatus for safely testing an autotransformer for power distribution lines |
Oct. 3, 1995 |
| 5276402 |
Three-phase transformer testing method and system |
Jan. 4, 1994 |
| 5200737 |
System and method for detecting partial discharge of gas-insulated switchgear |
Apr. 6, 1993 |
| 5075629 |
Partial discharge detecting device for electrical equipments |
Dec. 24, 1991 |
| 5041817 |
Arrangement for the inductive querying of and supplying of power to an isolated circuit having an electrical consuming device |
Aug. 20, 1991 |
| 4937561 |
Load detecting system for an engine driven generator |
Jun. 26, 1990 |
| 4868547 |
Transformer alarm annunciator |
Sep. 19, 1989 |
| 4843310 |
Electricity meter with arrangement for monitoring core saturation incidents |
Jun. 27, 1989 |
| 4839770 |
Control circuit with validity-determining arrangement |
Jun. 13, 1989 |
| 4796143 |
Electric transformer for underground mining machine |
Jan. 3, 1989 |
| 4772978 |
Transformer protection system |
Sep. 20, 1988 |
| 4754405 |
Tri-phase electronic temperature controller |
Jun. 28, 1988 |
| 4745571 |
Modular electronic temperature controller |
May. 17, 1988 |
| 4737775 |
Insulation deterioration monitoring apparatus |
Apr. 12, 1988 |
| 4689570 |
Digital protective relay monitoring system |
Aug. 25, 1987 |
| 4654806 |
Method and apparatus for monitoring transformers |
Mar. 31, 1987 |
| 4623265 |
Transformer hot-spot temperature monitor |
Nov. 18, 1986 |
| 4611167 |
Auxiliary winding for driving electric meter accessories |
Sep. 9, 1986 |
| 4502047 |
Electronic parts-mounting device with easy assembly and maintenance |
Feb. 26, 1985 |
| 4419619 |
Microprocessor controlled voltage regulating transformer |
Dec. 6, 1983 |
| 4350971 |
Circuit for use in the detection of the condition of an isolated switch contact |
Sep. 21, 1982 |
| 4337820 |
Leak detector for vaporization cooled transformers |
Jul. 6, 1982 |
| 4249170 |
Annunciator |
Feb. 3, 1981 |
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