GB607613A - Device for preventing the operation of differential relays when electrical inductiveapparatus is switched in - Google Patents
Device for preventing the operation of differential relays when electrical inductiveapparatus is switched inInfo
- Publication number
- GB607613A GB607613A GB28628/45A GB2862845A GB607613A GB 607613 A GB607613 A GB 607613A GB 28628/45 A GB28628/45 A GB 28628/45A GB 2862845 A GB2862845 A GB 2862845A GB 607613 A GB607613 A GB 607613A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coil
- spring
- preventing
- current
- contact
- 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
- H02H7/045—Differential protection of transformers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
607,613. Protective cut-out systems. AKT.- GES. BROWN, BOVERI, & CIE. Oct. 29, 1945, No. 28628. Convention date, Oct. 28, 1944. [Class 38 (v)] A device for preventing the undesired operation of differential relays, when a transformer is switched-in, has a mechanical vibration system responsive to magnetizing currents to render the relays inoperative. The coil b is energized by the difference-current between the two sides of the transformer, this current being substantially zero, and on switching-in, the magnetizing-current impulse energizes the coil b and contacts c, d close. Owing, however, to the fact that the torque causing contact c to move has the same frequency as that of the network, the spring f, which carries contact d and whose natural frequency coincides with the network frequency, vibrates, thereby preventing energization of the coil e of a timedelayed relay and closure of contacts g in the trip circuit h. The contact c may alternatively be spring-mounted. The spring f is preferably only coarsely tuned so that it responds to a frequency band whose width may be adjusted by a damping device. An intermediate relay may be used to render the differential relays inoperative.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH607613X | 1944-10-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB607613A true GB607613A (en) | 1948-09-02 |
Family
ID=4523181
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB28628/45A Expired GB607613A (en) | 1944-10-28 | 1945-10-29 | Device for preventing the operation of differential relays when electrical inductiveapparatus is switched in |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB607613A (en) |
-
1945
- 1945-10-29 GB GB28628/45A patent/GB607613A/en not_active Expired
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