GB191500717A - Protection of Electric Cables. - Google Patents
Protection of Electric Cables.Info
- Publication number
- GB191500717A GB191500717A GB191500717DA GB191500717A GB 191500717 A GB191500717 A GB 191500717A GB 191500717D A GB191500717D A GB 191500717DA GB 191500717 A GB191500717 A GB 191500717A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- cable
- shield
- conductors
- conducting
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/226—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices for wires or cables, e.g. heating wires
Landscapes
- Housings And Mounting Of Transformers (AREA)
Abstract
717. Bowden, J. H., and Thompson. H. F. J. July 16. Protective arrangements. - A system for the protection of electric cables having a conducting-shield 5, Fig. 1, round any of the conductors of the cable, and also an insulated conducting-shield 8 surrounding the whole of the conductors of the cable, and finally the usual lead covering 9. the earthing of the outer shield 8 by external damage places a high' voltage upon the one or more inner shields, which voltage operates cut-outs to isolate the faulty section. In the arrangement shown for a three - phase cable, each of the conductors is surrounded by a conducting-shield 5, the shields being in electrical contact and connected to earth at each end of the cable through an electro-magnetic relay 13 in series with a sparkgap 12, and the outer shield 8 is connected to earth through a relay 23 and through a small part of the secondary 27 of a transformer supplied from an independent source. In the event of external damage to the outer shield and the consequent earthing thereof, the relay is operated and connects the full voltage of the secondary winding 27 through the back contact 28 of the relay to the inner shields, producing a discharge through the spark-gap device and operating the relay 13 which controls the action of the main cut-out 19, 21. The relay 13 breaks the discharge circuit which is consequently diverted to the other end of the cable where it operates similar cut-outs so that the cable is isolated at both ends. The invention is applicable to single conductors and to concentric cables.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB191500717T | 1915-07-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB191500717A true GB191500717A (en) | 1916-05-25 |
Family
ID=32648663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB191500717D Expired GB191500717A (en) | 1915-07-16 | 1915-07-16 | Protection of Electric Cables. |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB191500717A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170275733A1 (en) * | 2015-10-26 | 2017-09-28 | Techemet, Llc | Method for platinum recovery from materials containing rhenium and platinum metals |
-
1915
- 1915-07-16 GB GB191500717D patent/GB191500717A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170275733A1 (en) * | 2015-10-26 | 2017-09-28 | Techemet, Llc | Method for platinum recovery from materials containing rhenium and platinum metals |
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