DC GROUND FAULT DETECTOR AND SYSTEM UNKAGE GENERATOR USING ITS DETECTOR

Title:

DC GROUND FAULT DETECTOR AND SYSTEM UNKAGE GENERATOR USING ITS DETECTOR

Document Type and Number:

Japanese Patent JP2004153991

Kind Code:

A

Abstract:

To secure higher safety by detecting ground faults of dc currents at lower cost with high accuracy.

A detector includes a zero-phase current transformer (ZCT)41 which measures the difference of quantities of the dc currents flowing through a plurality of dc lines 39A, 39B via a detecting core 44, and outputs a current measuring signal, a temperature sensor 50 which measures a temperature near the zero-phase current transformer (ZCT)41 and outputs a temperature measuring signal, and an MPU53 that makes correction in the temperature of the difference of the quantities of the currents corresponding to the measuring signal by a temperature corresponding to the temperature measuring signal and detects the dc ground fault generated in a conductor to be measured, based on the difference of the quantities of the currents after corrected in temperature.

Inventors:

MADENOKOJI MASAKI
ONIZUKA KEIGO
MAKINO YASUHIRO

Application Number:

JP2003305875A

Publication Date:

May 27, 2004

Filing Date:

August 29, 2003

Export Citation:

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Assignee:

SANYO ELECTRIC CO
SANYO ELECTRIC AIR CONDITION

International Classes:

H02H3/16; H02H7/122; H02J3/38; H02M7/48; H02H3/00; H02H5/04; (IPC1-7): H02H3/16; H02J3/38; H02M7/48

Attorney, Agent or Firm:

Masamasa Shibano

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