JPS5471355A - Eddy current relay - Google Patents

Eddy current relay

Info

Publication number
JPS5471355A
JPS5471355A JP13793977A JP13793977A JPS5471355A JP S5471355 A JPS5471355 A JP S5471355A JP 13793977 A JP13793977 A JP 13793977A JP 13793977 A JP13793977 A JP 13793977A JP S5471355 A JPS5471355 A JP S5471355A
Authority
JP
Japan
Prior art keywords
level
multiplyer
added
output
subtractor
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
JP13793977A
Other languages
Japanese (ja)
Inventor
Hiroshi Sasaki
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP13793977A priority Critical patent/JPS5471355A/en
Publication of JPS5471355A publication Critical patent/JPS5471355A/en
Pending legal-status Critical Current

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Landscapes

  • Emergency Protection Circuit Devices (AREA)

Abstract

PURPOSE: To obtain approximate over load protective characteristics of I2t in high accuracy, by introducing square I2 of effective value of input current, using an analogue multiplyer, and using level judgement in which setting interval is set by power number of 2 of a setting timer.
CONSTITUTION: Voltage which was made as a suitable level with an auxiliary transformer 21 is added to an analogue multiplyer 22, and square output wave shape information of input current i is obtained. A shifter 23 obtains only I2 component of direct current level which is necessary to judge over current from this instrument. Output of the multiplyer 22 and the shifter 23 is added to a subtractor 24, and output I2 of the subtractor 24 is added to a level judging instrument 25. A timer 26 makes I2 which is set for prevention of over load to be lower level than a specified level.
COPYRIGHT: (C)1979,JPO&Japio
JP13793977A 1977-11-18 1977-11-18 Eddy current relay Pending JPS5471355A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13793977A JPS5471355A (en) 1977-11-18 1977-11-18 Eddy current relay

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13793977A JPS5471355A (en) 1977-11-18 1977-11-18 Eddy current relay

Publications (1)

Publication Number Publication Date
JPS5471355A true JPS5471355A (en) 1979-06-07

Family

ID=15210226

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13793977A Pending JPS5471355A (en) 1977-11-18 1977-11-18 Eddy current relay

Country Status (1)

Country Link
JP (1) JPS5471355A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05292656A (en) * 1992-04-13 1993-11-05 Mitsubishi Electric Corp Overcurrent protective apparatus for power device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05292656A (en) * 1992-04-13 1993-11-05 Mitsubishi Electric Corp Overcurrent protective apparatus for power device

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