GB432428A - Improved protective arrangements for electric circuits - Google Patents
Improved protective arrangements for electric circuitsInfo
- Publication number
- GB432428A GB432428A GB257634A GB257634A GB432428A GB 432428 A GB432428 A GB 432428A GB 257634 A GB257634 A GB 257634A GB 257634 A GB257634 A GB 257634A GB 432428 A GB432428 A GB 432428A
- Authority
- GB
- United Kingdom
- Prior art keywords
- arresters
- circuit
- transformer
- liable
- relay
- 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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/738—Interface circuits for coupling substations to external telephone lines
- H04M1/74—Interface circuits for coupling substations to external telephone lines with means for reducing interference; with means for reducing effects due to line faults
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/30—Signalling arrangements; Manipulation of signalling currents
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
432,428. Protective arrangements. SIEMENS BROS. & CO., Ltd., Caxton House, Tothill Street, Westminster, and SUTTON, G. W., 25, Cranleigh Road, Merton Park, London. Jan. 25, 1934, No. 2576. [Class 38 (iv)] A telephone circuit TE liable to excess voltages is connected to a similar circuit TM situated in a dangerous quarter liable to explosions, e.g. in a mine, by means of a loosely coupled transformer TR the secondary winding, or a tertiary winding coupled thereto, being connected to one or more vapour discharge type arresters NT. The arresters may be connected across the terminals of the secondary winding from which the outgoing circuit may be tapped at a lower voltage. In addition a relay R of the self-locking type may be connected in parallel with the arresters NT in series with a resistance RE so that in the event of the arresters failing the relay R operates and its contacts r short circuit the primary of the transformer TR. The transformer core, and /or a shield therein, may be earthed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB257634A GB432428A (en) | 1934-01-23 | 1934-01-23 | Improved protective arrangements for electric circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB257634A GB432428A (en) | 1934-01-23 | 1934-01-23 | Improved protective arrangements for electric circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB432428A true GB432428A (en) | 1935-07-25 |
Family
ID=9741995
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB257634A Expired GB432428A (en) | 1934-01-23 | 1934-01-23 | Improved protective arrangements for electric circuits |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB432428A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1191435B (en) * | 1959-12-08 | 1965-04-22 | Siemens Ag | Circuit arrangement for connecting an intrinsically safe telephone station to a non-intrinsically safe dialing center |
-
1934
- 1934-01-23 GB GB257634A patent/GB432428A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1191435B (en) * | 1959-12-08 | 1965-04-22 | Siemens Ag | Circuit arrangement for connecting an intrinsically safe telephone station to a non-intrinsically safe dialing center |
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