GB330969A - Improvements in or relating to the control of electrical transformers - Google Patents
Improvements in or relating to the control of electrical transformersInfo
- Publication number
- GB330969A GB330969A GB906729A GB906729A GB330969A GB 330969 A GB330969 A GB 330969A GB 906729 A GB906729 A GB 906729A GB 906729 A GB906729 A GB 906729A GB 330969 A GB330969 A GB 330969A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- circuit
- load
- coils
- short
- 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
- H02H7/10—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 converters; for rectifiers
- H02H7/12—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 converters; for rectifiers for static converters or rectifiers
- H02H7/1209—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 converters; for rectifiers for static converters or rectifiers for converters using only discharge tubes
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Protection Of Transformers (AREA)
Abstract
330,969. Weekes, W. March. 20, 1929. Systems depending on static transformers.-In a supply system including a transformer applicable to supply a direct current circuit through mercury-arc rectifiers, in order to prevent the rush of current when the transformer is re-connected to the load after operation of the automatic cut-outs in the load circuit provision is made for automatically reducing the secondary voltage when the load is above a predetermined amount. This may be effected by choking coils in the primary or secondary circuits which are normally short-circuited by automatic switches controlled in accordance with the load current, and the choking coils may further be arranged to be in circuit on the initial switching-in of the supply. As shown in Fig. 1 applied to a transformer having a star-connected primary 1 the choking coils 4 are arranged in the connections to the starpoint 3 and are adapted to be short-circuited by automatic switches 6. A similar arrangement may be employed with a star-connected secondary winding. In the case of a delta-winding the choking-coils with their automatic short-circuiting devices are included in the line connections. The complete control arrangement employed in connection with the modification according to Fig. 1 is shown in Fig. 4 in which the 6-phase secondary winding supplies a D.C. load circuit 10, 11 through a mercury-arc rectifier 8. A time lag relay 12 is connected across lines 10, 11 and completes the circuit of a relay 15 which in turn completes the circuit of a relay 19, the movement of which controls the automatic short-circuiting switches 6 on the primary side. Thus on switching in a 'reduced voltage is first supplied. If the load-conditions are unsuitable for the full-voltage the relay 22, the winding of which is across a resistance 23, by opening contacts 17 prevents operation of the relay 19 and switches 6. The relay 19 on operation completes a maintaining circuit through contacts 21 under the control of the overload relay 24 so that a reduction of voltage is produced immediately this relay is operated. In a further modification in which choking coils having an intermittent rating may be employed, three-contact automatic switches are employed which after opening the short-circuit around the coils move to a further position in which a lower voltage transformer tapping is connected.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB906729A GB330969A (en) | 1929-03-20 | 1929-03-20 | Improvements in or relating to the control of electrical transformers |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB906729A GB330969A (en) | 1929-03-20 | 1929-03-20 | Improvements in or relating to the control of electrical transformers |
Publications (1)
Publication Number | Publication Date |
---|---|
GB330969A true GB330969A (en) | 1930-06-20 |
Family
ID=9864746
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB906729A Expired GB330969A (en) | 1929-03-20 | 1929-03-20 | Improvements in or relating to the control of electrical transformers |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB330969A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3487287A (en) * | 1967-11-14 | 1969-12-30 | Gen Electric | Static power converter with variable commutation reactance |
-
1929
- 1929-03-20 GB GB906729A patent/GB330969A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3487287A (en) * | 1967-11-14 | 1969-12-30 | Gen Electric | Static power converter with variable commutation reactance |
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