GB1288332A - - Google Patents
Info
- Publication number
- GB1288332A GB1288332A GB1288332DA GB1288332A GB 1288332 A GB1288332 A GB 1288332A GB 1288332D A GB1288332D A GB 1288332DA GB 1288332 A GB1288332 A GB 1288332A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transformer
- input
- voltage
- output
- 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
-
- 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
- H02H7/04—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 transformers
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/12—Regulating voltage or current wherein the variable actually regulated by the final control device is ac
- G05F1/40—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices
- G05F1/44—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices semiconductor devices only
- G05F1/45—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices semiconductor devices only being controlled rectifiers in series with the load
- G05F1/455—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices semiconductor devices only being controlled rectifiers in series with the load with phase control
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
1288332 Transformer protective circuits WESTINGHOUSE BRAKE & SIGNAL CO Ltd 6 Jan 1971 [19 Jan 1970] 2574/70 Heading H2H A transformer protection circuit, Fig. 1, comprises a transformer 4, the primary input of which is controlled at 5 by two S.C.R. devices in anti-parallel connection, gating pulses being applied by a generator 6 controlled at 8 by the source input 1, 2 and at 7 by a D.C. input, whereby the firing angle may be varied with respect to the phase of the A.C., the output of the transformer being rectified at 10 and filtered at 11 to power load 12, and in addition the output at 11 is applied at 21, 22, Fig. 2, filtered at 23, 25 and applied via a Zener diode 26 to the base of a transistor 28 via a potential divider 27. In normal operation the voltage across terminals 21, 22 is insufficient to break down the diode 26, however, in the event of open circuit at the transformer output, the voltage will rise greatly and a proportion will be applied to the base of the transistor 28 to form a conducting path to short out the D.C. input at 7, the circuits 6 thereby being caused to apply triggering pulses at firing angles retarded by at least #/2 with respect to the A.C. supply, the triggering of an S.C.R. thereby not taking place until after the other has ceased to conduct, owing to the phase difference between current and voltage in the primary circuit; the transformer is these conditions forming a substantially inductive load. The circuits may be adapted for polyphase operation.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB257470 | 1970-01-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1288332A true GB1288332A (en) | 1972-09-06 |
Family
ID=9741967
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1288332D Expired GB1288332A (en) | 1970-01-19 | 1970-01-19 |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1288332A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993009584A1 (en) * | 1991-11-01 | 1993-05-13 | Neolite Neon Company Pty Limited | Open circuit monitor |
-
1970
- 1970-01-19 GB GB1288332D patent/GB1288332A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993009584A1 (en) * | 1991-11-01 | 1993-05-13 | Neolite Neon Company Pty Limited | Open circuit monitor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |