GB826022A - A protective device for three-phase motors - Google Patents
A protective device for three-phase motorsInfo
- Publication number
- GB826022A GB826022A GB848056A GB848056A GB826022A GB 826022 A GB826022 A GB 826022A GB 848056 A GB848056 A GB 848056A GB 848056 A GB848056 A GB 848056A GB 826022 A GB826022 A GB 826022A
- Authority
- GB
- United Kingdom
- Prior art keywords
- current
- transformer
- conductors
- phase
- protective device
- 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
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/34—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system
Landscapes
- Protection Of Generators And Motors (AREA)
Abstract
826,022. Protective cut-out arrangements. CKD MODRANY, NARODNI PODNIK, and BERMANN, J. March 19, 1956, No. 8480/56. Class 38 (5). An arrangement responsive to negative phase sequence current components in a 3- phase system comprises in one X of the conductors a relay or ammeter A which is also connected to the secondary of an air-gap transformer arranged in another Z of the conductors, the connections being such and the impedance of the transformer being such that the secondary short-circuit current of the transformer compensates in magnitude and phase the current in device A, so that normally the latter does not carry current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB848056A GB826022A (en) | 1956-03-19 | 1956-03-19 | A protective device for three-phase motors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB848056A GB826022A (en) | 1956-03-19 | 1956-03-19 | A protective device for three-phase motors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB826022A true GB826022A (en) | 1959-12-23 |
Family
ID=9853274
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB848056A Expired GB826022A (en) | 1956-03-19 | 1956-03-19 | A protective device for three-phase motors |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB826022A (en) |
-
1956
- 1956-03-19 GB GB848056A patent/GB826022A/en not_active Expired
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