GB551544A - Improved means for detecting, indicating or signalling conditions prevailing in an electric circuit - Google Patents
Improved means for detecting, indicating or signalling conditions prevailing in an electric circuitInfo
- Publication number
- GB551544A GB551544A GB30642A GB30642A GB551544A GB 551544 A GB551544 A GB 551544A GB 30642 A GB30642 A GB 30642A GB 30642 A GB30642 A GB 30642A GB 551544 A GB551544 A GB 551544A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- indicating
- faults
- contacts
- detecting
- 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
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B5/00—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied
- G08B5/22—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Alarm Systems (AREA)
Abstract
551,544. Indicating faults. LONDEX, Ltd., BROWN, W. S. F., and STERN, W. Jan. 8, 1942, No. 306. [Class 37] Faults in a circuit 4 supplied by a transformer 5 are indicated by means of a pair of opposed rectifiers 2, 3 at opposite ends of the circuit and a D.C. relay coil 1 which is normally unenergized, but when a short-circuit 17 occurs, is energized by alternate halfwaves and closes contacts 8, 9 in the circuit of an indicator lamp 10 and bell 11. A further D.C. relay coil 12 in series with a rectifier 13 connected in the same sense as 3 is normally energized by alternate half-waves and holds open contacts 14, 15, but on open-circuiting of the circuit 4, contacts 14, 15 make the circuit of the bell 11 and a further lamp 16. If the circuit 4 has an earth-return, earth faults also will be indicated. Means may be provided for testing the relays, and automatic or manual means may be adapted to make a connection 17 and give an alarm. The invention may be combined with known means for locating the fault.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB30642A GB551544A (en) | 1942-01-08 | 1942-01-08 | Improved means for detecting, indicating or signalling conditions prevailing in an electric circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB30642A GB551544A (en) | 1942-01-08 | 1942-01-08 | Improved means for detecting, indicating or signalling conditions prevailing in an electric circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB551544A true GB551544A (en) | 1943-02-26 |
Family
ID=9702057
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB30642A Expired GB551544A (en) | 1942-01-08 | 1942-01-08 | Improved means for detecting, indicating or signalling conditions prevailing in an electric circuit |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB551544A (en) |
-
1942
- 1942-01-08 GB GB30642A patent/GB551544A/en not_active Expired
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