Title:
CURRENT LEAKAGE SENSOR AND CIRCUIT PROTECTION SYSTEM
Document Type and Number:
WIPO Patent Application WO/2023/281696
Kind Code:
A1
Abstract:
This current leakage sensor suppresses erroneous detection of current leakage when there is positive/negative excitation magnetic field asymmetry. An imbalance assessment circuit (15) assesses positive/negative excitation magnetic field asymmetry during the flow of balanced current through a current line (30) under measurement on the basis of an excitation signal and an excitation magnetic field acquired from a magnetic sensor (14) during the flow of the balanced current through the current line (30) under measurement, and generates a control signal. On the basis of the control signal, an excitation circuit (16) reduces the magnitude of the positive or negative amplitude of the excitation current or superposes a positive or negative offset current on the excitation current.
Inventors:
MIYAUCHI TOSHIHIKO (JP)
OKADA YASUYUKI (JP)
OKADA YASUYUKI (JP)
Application Number:
PCT/JP2021/025779
Publication Date:
January 12, 2023
Filing Date:
July 08, 2021
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
G01R15/18; G01R31/52; G01R33/04
Foreign References:
| JP2019012004A | 2019-01-24 | |||
| JP2014235086A | 2014-12-15 | |||
| JP2013061322A | 2013-04-04 | |||
| JP2018091626A | 2018-06-14 | |||
| JP2015068725A | 2015-04-13 | |||
| JP2015194508A | 2015-11-05 |
Attorney, Agent or Firm:
PALMO PATENT FIRM, P.C. (JP)
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