JPS5450944A - Protective device for synchronous motor - Google Patents
Protective device for synchronous motorInfo
- Publication number
- JPS5450944A JPS5450944A JP11751677A JP11751677A JPS5450944A JP S5450944 A JPS5450944 A JP S5450944A JP 11751677 A JP11751677 A JP 11751677A JP 11751677 A JP11751677 A JP 11751677A JP S5450944 A JPS5450944 A JP S5450944A
- Authority
- JP
- Japan
- Prior art keywords
- overcurrent relay
- synchronous motor
- time
- working
- instantaneous
- 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
Abstract
PURPOSE: To make a protection of synchronous motor, by such means that in addition to a long period time delay switching characteristic and a first instantaneous element for working at a time of short-circuit, a second instantaneous element for working at a current 200 to 400% of the rated current be provided in the overcurrent relay with a time cooperation kept operating between with an operation of said second instantaneous element.
CONSTITUTION: An overcurrent relay OC-11, having a long period time delaying characteristic element, a first instantaneous element for working at a time of short- circuit and a second instantaneous element for woeking in a range from 200 to 400% of the rated current, is applied instead of an overcurrent relay OC-1. And with a combination made between output contacts of each element of the overcurrent relay OC-11 as described in the above, a protective control circuit is constituted as shown in the drawing. In this way, a synchronous motor can be protected in all of the ranges in starting and in running
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11751677A JPS5450944A (en) | 1977-09-30 | 1977-09-30 | Protective device for synchronous motor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11751677A JPS5450944A (en) | 1977-09-30 | 1977-09-30 | Protective device for synchronous motor |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5450944A true JPS5450944A (en) | 1979-04-21 |
Family
ID=14713690
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11751677A Pending JPS5450944A (en) | 1977-09-30 | 1977-09-30 | Protective device for synchronous motor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5450944A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05268798A (en) * | 1992-03-17 | 1993-10-15 | Hitachi Ltd | Power generating facility |
EP2151579A1 (en) * | 2008-08-05 | 2010-02-10 | Ksb S.A.S | Malfunction control of a motor pump |
-
1977
- 1977-09-30 JP JP11751677A patent/JPS5450944A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05268798A (en) * | 1992-03-17 | 1993-10-15 | Hitachi Ltd | Power generating facility |
EP2151579A1 (en) * | 2008-08-05 | 2010-02-10 | Ksb S.A.S | Malfunction control of a motor pump |
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