GB1360469A - Magnetic field detector - Google Patents
Magnetic field detectorInfo
- Publication number
- GB1360469A GB1360469A GB5601771A GB5601771A GB1360469A GB 1360469 A GB1360469 A GB 1360469A GB 5601771 A GB5601771 A GB 5601771A GB 5601771 A GB5601771 A GB 5601771A GB 1360469 A GB1360469 A GB 1360469A
- Authority
- GB
- United Kingdom
- Prior art keywords
- switch
- red light
- pressed
- stable
- field
- 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
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
Landscapes
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Locating Faults (AREA)
Abstract
1360469 Detecting power cable faults BOWDEN BROS Ltd 4 Dec 1972 [2 Dec 1971] 56017/71 Headings G1N and G1U Faults in an overhead power line are detected by sensing any significant change in the ground level magnetic field. Fig. 1 shows the system in outline; a ferrite cored winding 1 responds to changes in the field, and its signal is amplified at 2 and fed via a sensitivity potentiometer 3 to a bi-stable switch 4. When a test switch 8 is manually pressed, either a green or a red light is illuminated depending on the state of the bistable switch. A further manual switch 9 allows the red light to be tested. In use the system is placed on the ground when the power line is functioning normally; if switch 8 is pressed the green light operates. If there is a subsequent field change of magnitude sufficient to operate the bi-stable switch, the red light will operate when switch 8 is pressed. The bi-stable switch may be a flip-flop, Fig. 3 (not shown) or an SCR Fig. 4 (not shown). A delay is preferably built into the system to avoid switching by transients. The bi-stable switch may be automatically reset when the original field is restored by correcting the fault.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5601771A GB1360469A (en) | 1972-12-04 | 1972-12-04 | Magnetic field detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5601771A GB1360469A (en) | 1972-12-04 | 1972-12-04 | Magnetic field detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1360469A true GB1360469A (en) | 1974-07-17 |
Family
ID=10475526
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5601771A Expired GB1360469A (en) | 1972-12-04 | 1972-12-04 | Magnetic field detector |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1360469A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3119925A1 (en) * | 1981-07-10 | 1982-12-16 | András Dipl.-Ing. 1116 Budapest Bely | METHOD AND DEVICE FOR REMOTELY DETECTING THE GROUND CIRCUIT ON POWER CABLE OVERHEAD LINES |
-
1972
- 1972-12-04 GB GB5601771A patent/GB1360469A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3119925A1 (en) * | 1981-07-10 | 1982-12-16 | András Dipl.-Ing. 1116 Budapest Bely | METHOD AND DEVICE FOR REMOTELY DETECTING THE GROUND CIRCUIT ON POWER CABLE OVERHEAD LINES |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |