GB1384995A - Protection circuit for capactitative voltage transformers - Google Patents
Protection circuit for capactitative voltage transformersInfo
- Publication number
- GB1384995A GB1384995A GB1084173A GB1084173A GB1384995A GB 1384995 A GB1384995 A GB 1384995A GB 1084173 A GB1084173 A GB 1084173A GB 1084173 A GB1084173 A GB 1084173A GB 1384995 A GB1384995 A GB 1384995A
- Authority
- GB
- United Kingdom
- Prior art keywords
- voltage
- circuit
- burden
- switching device
- triac
- 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
- H02H7/05—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 for capacitive voltage transformers, e.g. against resonant conditions
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Electrical Variables (AREA)
- Power Conversion In General (AREA)
Abstract
1384995 Voltage transformers MICAFIL Ltd 6 March 1973 10841/73 Heading H2H A circuit comprising a capacitive voltage divider C 1 , C 2 has a part thereof C 2 shunted by the primary winding of a transformer T, the secondary winding of which is connectible by a controlled switching device S to a burden R 1 , the arrangement being such that the burden R 1 is normally out of circuit but in the event of a voltage collapse across the transformer primary winding is connected to the secondary winding by the switching device S in less than five milliseconds so as to suppress voltage transients. The switching device S may comprise a triac or a pair of opposed-parallel connected thyristors. The signals to operate the triac or thyristors are developed by devices included in the circuit, such as by means of an inductor connected in series with the capacitors C 1 , C 2 or a capacitor which is charged from a stabilized voltage source and which is then discharged by means of a transistor to produce a unidirectional pulsating voltage. Furthermore the capacitor may be charged during one half wave of a voltage cycle and subtracting therefrom the voltage value of the succeeding half cycle, a triggering signal being produced if the values of two successive half waves differ. Lastly the burden R 1 may be divided into parts, all of which are switched into circuit together but which are removed from circuit in a time-staggered sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1084173A GB1384995A (en) | 1973-03-06 | 1973-03-06 | Protection circuit for capactitative voltage transformers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1084173A GB1384995A (en) | 1973-03-06 | 1973-03-06 | Protection circuit for capactitative voltage transformers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1384995A true GB1384995A (en) | 1975-02-26 |
Family
ID=9975317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1084173A Expired GB1384995A (en) | 1973-03-06 | 1973-03-06 | Protection circuit for capactitative voltage transformers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1384995A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111830864A (en) * | 2020-06-13 | 2020-10-27 | 青岛鼎信通讯股份有限公司 | Current generating circuit for line-to-line relation identification terminal |
-
1973
- 1973-03-06 GB GB1084173A patent/GB1384995A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111830864A (en) * | 2020-06-13 | 2020-10-27 | 青岛鼎信通讯股份有限公司 | Current generating circuit for line-to-line relation identification terminal |
| CN111830864B (en) * | 2020-06-13 | 2024-01-23 | 青岛鼎信通讯股份有限公司 | Current generation circuit for linear transformation relation identification terminal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |