JPS5450944A - Protective device for synchronous motor - Google Patents

Protective device for synchronous motor

Info

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
Application number
JP11751677A
Other languages
Japanese (ja)
Inventor
Seishiro Goto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP11751677A priority Critical patent/JPS5450944A/en
Publication of JPS5450944A publication Critical patent/JPS5450944A/en
Pending legal-status Critical Current

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
JP11751677A 1977-09-30 1977-09-30 Protective device for synchronous motor Pending JPS5450944A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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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