JPS54153255A - Transformer protecting device - Google Patents
Transformer protecting deviceInfo
- Publication number
- JPS54153255A JPS54153255A JP6100378A JP6100378A JPS54153255A JP S54153255 A JPS54153255 A JP S54153255A JP 6100378 A JP6100378 A JP 6100378A JP 6100378 A JP6100378 A JP 6100378A JP S54153255 A JPS54153255 A JP S54153255A
- Authority
- JP
- Japan
- Prior art keywords
- higher harmonic
- ratio
- transformer
- circuit
- added
- 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.)
- Pending
Links
Landscapes
- Protection Of Transformers (AREA)
Abstract
PURPOSE: To improve sensitivity and to prevent malfunction by taking out two elements of ratio differential and higher harmonic ratio separately for protecting a transformer when tripping is permitted by both decisions on the basis of respective elements.
CONSTITUTION: The abnormal current in a transformer T is detected by current transformers CT1 and CT2 to be added to a scalar sum arithmetic circuit 1 and a vector sum arithmetic circuit 2, and the resultant outputs are respectively supplied to a ratio differential element 3 and a higher harmonic ratio element 4 and a higher harmonic ratio element 4. Agreed conditions between both signals are taken by an AND circuit 5 to be used for a trip instruction signal. Level decision circuits L1 and L2 are added to a fundamental harmonic detecting circuit F1 and the second higher harmonic detecting circuit F2 not to give any blind area to the higher harmonic ratio element 4. Since this construction serves to eliminate the interference between the ratio differential characteristic and the restraining characteristic at the switch-on time of the transformer, both characteristics can be highly promoted in their sensitivity and the system is prevented from malfunctions.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6100378A JPS54153255A (en) | 1978-05-24 | 1978-05-24 | Transformer protecting device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6100378A JPS54153255A (en) | 1978-05-24 | 1978-05-24 | Transformer protecting device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54153255A true JPS54153255A (en) | 1979-12-03 |
Family
ID=13158736
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6100378A Pending JPS54153255A (en) | 1978-05-24 | 1978-05-24 | Transformer protecting device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54153255A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58124035U (en) * | 1982-02-17 | 1983-08-23 | 株式会社明電舎 | Relay with second harmonic suppression device |
-
1978
- 1978-05-24 JP JP6100378A patent/JPS54153255A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58124035U (en) * | 1982-02-17 | 1983-08-23 | 株式会社明電舎 | Relay with second harmonic suppression device |
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