EARTH LEAKAGE DETECTION DEVICE

WIPO Patent Application WO/2012/127307

A1

Provided is an earth leakage detection device capable of quickly distinguishing between an ordinary earth leakage and a thunder surge. The earth leakage detection device comprises: a zero-phase current transformer (ZCT) (10) through which AC cable runs pass; an integration calculation unit (20) for integrating the output voltage of the zero-phase current transformer (10); an integrated value comparison unit (30) for, when the calculation result obtained by the integration calculation unit (20) is greater than a predetermined range, outputting a first signal; a waveform identification unit (40) for detecting and counting the inflection points of the output voltage waveform of the zero-phase current transformer and for, when the number of the inflection points reaches a predetermined number, outputting a second signal; and an earth current detection unit (50) for, when the integrated value comparison unit (30) outputs the first signal and the waveform identification unit (40) outputs the second signal, outputting an earth leakage detection signal indicating that earth leakage is occurring in the AC cable runs.

YAMAZOE KOICHI (JP)
TANAKA TSUYOSHI (JP)
KANDA MASATAKA (JP)
SHIOKAWA AKIMI (JP)

PCT/IB2012/000560

September 27, 2012

March 22, 2012

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PANASONIC CORP (JP)
YAMAZOE KOICHI (JP)
TANAKA TSUYOSHI (JP)
KANDA MASATAKA (JP)
SHIOKAWA AKIMI (JP)

G01R31/02; H02H3/16; H02H3/33

JPH1094161A	1998-04-10
JP2003219552A	2003-07-31
JP2009081928A	2009-04-16
JPH07296708A	1995-11-10
JPH02201274A	1990-08-09

FIRSTLAW P. C. (KR)
The first Patent Law people (KR)

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