GB498717A - Improvements in and relating to electric time relays - Google Patents
Improvements in and relating to electric time relaysInfo
- Publication number
- GB498717A GB498717A GB440/38A GB44038A GB498717A GB 498717 A GB498717 A GB 498717A GB 440/38 A GB440/38 A GB 440/38A GB 44038 A GB44038 A GB 44038A GB 498717 A GB498717 A GB 498717A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- winding
- current
- condenser
- surge
- 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
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
- H01H47/18—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay for introducing delay in the operation of the relay
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/28—Modifications for introducing a time delay before switching
Landscapes
- Relay Circuits (AREA)
Abstract
498,717. Electromagnetic relays. BRITISH THOMSON-HOUSTON CO., Ltd. Jan. 6, 1938, No. 440. Convention date, Jan. 7, 1937. [Class 38 (v)] In a time delay relay with two windings, the operating or release time of the relay is determined by the decay of the charging surge of current that occurs when a condenser is placed in circuit. Fig. 1 shows a form in which operation of the relay is delayed. Closure of a switch S energizes the working winding 1, 2 and also causes a surge of current to charge a condenser C through an opposition winding 4, 5. Only when the surge diminishes sufficiently, due to the condenser becoming charged, is the winding 1, 2 powerful enough to operate the relay. The contact r then moves across and the condenser is discharged through a resistance W. In an alternative arrangement, the charging surge at first overpowers the current in 1, 2 and operates the relay at once, the relay subsequently being released and again operated as above. In Fig. 2, movement of a switch S to the left causes the winding 1, 2 to operate a relay. Subsequent movement of the switch S back to its original position causes a surge of current through the winding 4, 5 to charge the condenser C. This current assists the dying away current in the winding 1, 2 and prevents the relay from releasing till after a time interval. Specification 484,458 is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE484458X | 1936-11-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB498717A true GB498717A (en) | 1939-01-12 |
Family
ID=6543129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB440/38A Expired GB498717A (en) | 1936-11-17 | 1938-01-06 | Improvements in and relating to electric time relays |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB498717A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2925535A (en) * | 1955-03-22 | 1960-02-16 | Bbc Brown Boveri & Cie | Protective device |
-
1938
- 1938-01-06 GB GB440/38A patent/GB498717A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2925535A (en) * | 1955-03-22 | 1960-02-16 | Bbc Brown Boveri & Cie | Protective device |
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