GB289538A - Improvements relating to leakage indicators for alternating current circuits - Google Patents
Improvements relating to leakage indicators for alternating current circuitsInfo
- Publication number
- GB289538A GB289538A GB251327A GB251327A GB289538A GB 289538 A GB289538 A GB 289538A GB 251327 A GB251327 A GB 251327A GB 251327 A GB251327 A GB 251327A GB 289538 A GB289538 A GB 289538A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- relay
- transformers
- rectifying
- current circuits
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
- G01R27/18—Measuring resistance to earth, i.e. line to ground
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/16—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
289,538. Peter, L. H., and Westing- house Brake & Saxby Signal Co., Ltd. Jan. 28, 1927. Detecting and indicating faults. - A leakage indicator for alternating-current circuits comprises a transformer or a rectifying device connected between each of the circuit conductors and earth and arranged to actuate a relay operating an indicator. As shown the primary 3, 7 of transformers 4, 8 are connected between the circuit conductors 1, 5 respectively and earth. The secondary windings 11, 15 of the transformers 4, 8 are connected to the diagonally opposite points of rectifying systems 12, 16 respectively, the other pairs of diagonally opposite points being connected to relay windings 13, 17. Normally the armatures 19, 20 of both relays 13, 17 are attracted and close the circuit of a green lamp 24 between supply terminals 23, 25. On the occurrence of a fault on one of the mains 1, 5, the corresponding primary winding is more or less short-circuited causing de-energization of the associated relay and thereby closing the circuit of one or other of the red lamps 28, 29. In a modification the transformers 4, 8 are omitted, the mains 1, 5 being connected directly to the rectifying systems 12, 16. Regulating resistances may be included in circuit with the relay winding 13, 17. The rectifying units are preferably of the metal oxide type described in Specification 257,305.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB251327A GB289538A (en) | 1927-01-28 | 1927-01-28 | Improvements relating to leakage indicators for alternating current circuits |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB251327A GB289538A (en) | 1927-01-28 | 1927-01-28 | Improvements relating to leakage indicators for alternating current circuits |
Publications (1)
Publication Number | Publication Date |
---|---|
GB289538A true GB289538A (en) | 1928-04-30 |
Family
ID=9740884
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB251327A Expired GB289538A (en) | 1927-01-28 | 1927-01-28 | Improvements relating to leakage indicators for alternating current circuits |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB289538A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2585734A (en) * | 1948-01-02 | 1952-02-12 | Fred J Bucher | Leakage indicator and protective equipment for direct current distributing circuits |
US2623107A (en) * | 1949-10-04 | 1952-12-23 | Westinghouse Air Brake Co | Ground detecting apparatus |
US2660717A (en) * | 1949-12-22 | 1953-11-24 | Herman A Hood | Electrical ground detector |
US2697217A (en) * | 1953-03-17 | 1954-12-14 | Crouse Hinds Co | Ground detecting apparatus |
US2907016A (en) * | 1953-07-23 | 1959-09-29 | Petcar Res Corp | Short circuit and grounding indicator for flame detector systems |
US3218622A (en) * | 1962-12-03 | 1965-11-16 | Birtcher Corp | Ground fault detector |
US3641548A (en) * | 1969-02-17 | 1972-02-08 | Larry A Groce | Overcurrent-fault indicator apparatus for trunk lines of an electrical power distribution system |
-
1927
- 1927-01-28 GB GB251327A patent/GB289538A/en not_active Expired
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2585734A (en) * | 1948-01-02 | 1952-02-12 | Fred J Bucher | Leakage indicator and protective equipment for direct current distributing circuits |
US2623107A (en) * | 1949-10-04 | 1952-12-23 | Westinghouse Air Brake Co | Ground detecting apparatus |
US2660717A (en) * | 1949-12-22 | 1953-11-24 | Herman A Hood | Electrical ground detector |
US2697217A (en) * | 1953-03-17 | 1954-12-14 | Crouse Hinds Co | Ground detecting apparatus |
US2907016A (en) * | 1953-07-23 | 1959-09-29 | Petcar Res Corp | Short circuit and grounding indicator for flame detector systems |
US3218622A (en) * | 1962-12-03 | 1965-11-16 | Birtcher Corp | Ground fault detector |
US3641548A (en) * | 1969-02-17 | 1972-02-08 | Larry A Groce | Overcurrent-fault indicator apparatus for trunk lines of an electrical power distribution system |
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