JPS5560859A - Direct current detector - Google Patents

Direct current detector

Info

Publication number
JPS5560859A
JPS5560859A JP13407778A JP13407778A JPS5560859A JP S5560859 A JPS5560859 A JP S5560859A JP 13407778 A JP13407778 A JP 13407778A JP 13407778 A JP13407778 A JP 13407778A JP S5560859 A JPS5560859 A JP S5560859A
Authority
JP
Japan
Prior art keywords
current
cores
making
control circuits
another
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
JP13407778A
Other languages
Japanese (ja)
Inventor
Kiyoshi Nakamura
Hiroaki Ishikawa
Hisakatsu Kiwaki
Fumio Ogata
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 JP13407778A priority Critical patent/JPS5560859A/en
Priority to EP79302318A priority patent/EP0010921B1/en
Priority to US06/089,372 priority patent/US4286211A/en
Publication of JPS5560859A publication Critical patent/JPS5560859A/en
Pending legal-status Critical Current

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  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)

Abstract

PURPOSE: To detect a direct current with high accuracy without making a slit, by feedbacking an output current deviation determined by a current collation circuit for a first and a second control circuits made of saturable reactors alternately placed in the sequence of the magnitude of exciting currents to cancel magnetomotive forces by one another.
CONSTITUTION: Exciting currents 1' and 2', 3' and 4' are selected for the cores 11 and 12, 13 and 14 of reactors which are equal to one another in current transformer operation time. Output windings 31 and 32, 33 and 34 are connected to each other so that a first and a second control circuits 1, 2 comprising AC power sources 61, 62 and maximum current preference diodes 75 and 76, 77 and 78 are provided. The slitless deviations of the small-ripple output maximum direct currents of the control circuits 1, 2 are determined by a common resistor 65 of a collation means without making an error due to the difference in resistance and temperature coefficient or the like. The magnetomotive forces of the cores 11W14 are cancelled by one another through windings 41W44 to which the deviations are feedbacked. As a result, a direct current flowing through primary conductors 21W24 penetrating the cores 11W14 is detected through a resistor 101 without making a slit.
COPYRIGHT: (C)1980,JPO&Japio
JP13407778A 1978-10-30 1978-10-30 Direct current detector Pending JPS5560859A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP13407778A JPS5560859A (en) 1978-10-30 1978-10-30 Direct current detector
EP79302318A EP0010921B1 (en) 1978-10-30 1979-10-24 Direct current detecting device using saturable reactors
US06/089,372 US4286211A (en) 1978-10-30 1979-10-30 Direct current detecting device using saturable reactors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13407778A JPS5560859A (en) 1978-10-30 1978-10-30 Direct current detector

Publications (1)

Publication Number Publication Date
JPS5560859A true JPS5560859A (en) 1980-05-08

Family

ID=15119849

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13407778A Pending JPS5560859A (en) 1978-10-30 1978-10-30 Direct current detector

Country Status (1)

Country Link
JP (1) JPS5560859A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008519269A (en) * 2004-11-05 2008-06-05 ダンフィシク アクティーゼルスカブ Detection circuit for current measurement

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008519269A (en) * 2004-11-05 2008-06-05 ダンフィシク アクティーゼルスカブ Detection circuit for current measurement
JP4842275B2 (en) * 2004-11-05 2011-12-21 リエゾン エレクトロニク・メカニク レム ソシエテ アノニム Detection circuit for current measurement

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