GB464088A - Improvements in and relating to protective circuits - Google Patents
Improvements in and relating to protective circuitsInfo
- Publication number
- GB464088A GB464088A GB29560/36A GB2956036A GB464088A GB 464088 A GB464088 A GB 464088A GB 29560/36 A GB29560/36 A GB 29560/36A GB 2956036 A GB2956036 A GB 2956036A GB 464088 A GB464088 A GB 464088A
- Authority
- GB
- United Kingdom
- Prior art keywords
- impedance
- switch
- fuse
- resistance
- current
- 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
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F29/00—Variable transformers or inductances not covered by group H01F21/00
- H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
- H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Fuses (AREA)
Abstract
464,088. Protective cut-out arrangements. BRITISH THOMSON-HOUSTON CO., Ltd. Oct. 30, 1936, No. 29560. Convention date, Oct. 30, 1935. [Class 38 (v)] [Also in Group XXXV] In conjunction with a transformer tap-changing switch adapted to operate under load, protective means are provided for the impedance utilized for carrying the load current during the tap-changing operation, a normally-open switch being provided for short-circuiting the impedance, this switch being biassed to its closed position while current-responsive means hold the switch open unless the current through the impedance exceeds a given value for a given time. As shown in the Figure the impedance employed in conjunction with the transformer tap-changing switch 2 may be an ordinary resistance or inductance or as shown may consist of a block 1 of ceramic resistance material known under the Registered Trade Mark " Thyrite " having a negative resistance characteristic. This impedance is connected in series with a tension fuse 10 holding a switch. blade 8 away from a contact 7 against the action of a spring 9. Normally the fuse 10 can carry the line current during the period of time required for an ordinary tapchanging operation but if for any reason the switch 2 stops in an " off " position, i.e. midway between two contacts, the current flowing through the impedance and fuse melts the latter, allowing the switch 8 to close and shortcircuit the impedance. The closing action of the blade 8 rapidly increases the distance between the severed ends of the fuse, so preventing sustained arcing between these points. To protect the impedance from injury and overheating by relatively low currents of long duration which would not affect the fuse 10, a mass of fusible material 18 surrounds the insulated resistance-securing bolt 12 and in such an eventuality melts, falling down and spreading out so as to interconnect the terminal plates 13 at opposite sides of the resistance block 1.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US464088XA | 1935-10-30 | 1935-10-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB464088A true GB464088A (en) | 1937-04-12 |
Family
ID=21943292
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB29560/36A Expired GB464088A (en) | 1935-10-30 | 1936-10-30 | Improvements in and relating to protective circuits |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE723212C (en) |
| GB (1) | GB464088A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007029905B4 (en) * | 2007-06-28 | 2009-07-02 | Areva Energietechnik Gmbh | Method for operating an electrical transformer |
-
1936
- 1936-10-30 GB GB29560/36A patent/GB464088A/en not_active Expired
- 1936-10-30 DE DEA80925D patent/DE723212C/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE723212C (en) | 1942-07-31 |
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