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WO1999002997A3 - Dc and ac current sensor with discontinuous sampling - Google Patents

Dc and ac current sensor with discontinuous sampling Download PDF

Info

Publication number
WO1999002997A3
WO1999002997A3 PCT/IB1998/001034 IB9801034W WO9902997A3 WO 1999002997 A3 WO1999002997 A3 WO 1999002997A3 IB 9801034 W IB9801034 W IB 9801034W WO 9902997 A3 WO9902997 A3 WO 9902997A3
Authority
WO
WIPO (PCT)
Prior art keywords
current
voltage
transformer
sensing winding
sample
Prior art date
Application number
PCT/IB1998/001034
Other languages
French (fr)
Other versions
WO1999002997A2 (en
Inventor
Wen-Jian Gu
Nai-Chi Lee
Original Assignee
Koninkl Philips Electronics Nv
Philips Norden Ab
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 Koninkl Philips Electronics Nv, Philips Norden Ab filed Critical Koninkl Philips Electronics Nv
Publication of WO1999002997A2 publication Critical patent/WO1999002997A2/en
Publication of WO1999002997A3 publication Critical patent/WO1999002997A3/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
    • G01R15/183—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

Current is sensed by a circuit which provides a high frequency reversing voltage to a sensing winding on a current transformer, for driving the transformer into its linear region once per cycle of applied voltage. Current through the sensing winding is sampled while the transformer is in that linear region. After taking a current sample application of the reversing voltage, sensor power consumption is reduced by inhibiting the application of voltage to the sensing winding for one or more of the high frequency cycles, or the same control and sensing circuitry is used to cause application of reversing voltage to a sensing winding on a different transformer measuring current through a different conductor, such as in a polyphase arrangement or for monitoring ground fault current. Preferably, the current is sampled approximately at the instants of reversal of the voltage being applied to the sensing winding, and the sample having the lower absolute value is selected as a sample proportional to the line current.
PCT/IB1998/001034 1997-07-08 1998-07-06 Dc and ac current sensor with discontinuous sampling WO1999002997A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US88927997A 1997-07-08 1997-07-08
US08/889,279 1997-07-08

Publications (2)

Publication Number Publication Date
WO1999002997A2 WO1999002997A2 (en) 1999-01-21
WO1999002997A3 true WO1999002997A3 (en) 1999-04-08

Family

ID=25394854

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB1998/001034 WO1999002997A2 (en) 1997-07-08 1998-07-06 Dc and ac current sensor with discontinuous sampling

Country Status (1)

Country Link
WO (1) WO1999002997A2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7145321B2 (en) * 2005-02-25 2006-12-05 Sandquist David A Current sensor with magnetic toroid
US9001476B2 (en) 2013-03-15 2015-04-07 Rockwell Automation Technologies, Inc. Multimotor variable frequency overload
EP3893346A1 (en) 2020-04-09 2021-10-13 HS Elektronik Systeme GmbH Electric safety circuit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4314200A (en) * 1977-09-01 1982-02-02 Bbc Brown, Boveri & Company Limited Method and apparatus for detection of magnetization
US5223789A (en) * 1989-06-23 1993-06-29 Fuji Electric Co., Ltd. AC/DC current detecting method
WO1996020408A2 (en) * 1994-12-28 1996-07-04 Philips Electronics N.V. Dc and ac current sensor having a minor-loop operated current transformer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4314200A (en) * 1977-09-01 1982-02-02 Bbc Brown, Boveri & Company Limited Method and apparatus for detection of magnetization
US5223789A (en) * 1989-06-23 1993-06-29 Fuji Electric Co., Ltd. AC/DC current detecting method
WO1996020408A2 (en) * 1994-12-28 1996-07-04 Philips Electronics N.V. Dc and ac current sensor having a minor-loop operated current transformer

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Vol. 13, No. 368, (P-919); & JP 01124772 A (HITACHI LTD) 17 May 1989. *
PATENT ABSTRACTS OF JAPAN, Vol. 13, No. 426, (P-935); & JP 01158365 A (FUJI ELECTRIC CO LTD) 21 June 1989. *
PATENT ABSTRACTS OF JAPAN, Vol. 14, No. 61, (P-1001); & JP 01285866 A (FUJI ELECTRIC CO LTD) 16 November 1989. *

Also Published As

Publication number Publication date
WO1999002997A2 (en) 1999-01-21

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