Ground fault sensing device

Ground fault sensing device

A ground fault sensing device for a drive system that converts direct current electrical power from a direct current power supply (30) into alternating current electrical power and drives an electric motor (10) with that alternating current electrical power, comprises: an extraction circuit (41) tha...

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Hauptverfasser: YANAI, TAKAO, YOSHIDA, TAKESHI
Format: Patent
Sprache:eng ; fre ; ger
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MEASURING
MEASURING ELECTRIC VARIABLES
MEASURING MAGNETIC VARIABLES
PHYSICS
TESTING
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creator YANAI, TAKAO
YOSHIDA, TAKESHI
description A ground fault sensing device for a drive system that converts direct current electrical power from a direct current power supply (30) into alternating current electrical power and drives an electric motor (10) with that alternating current electrical power, comprises: an extraction circuit (41) that is connected to a power supply line of the direct current power supply (30) via a coupling capacitor, that detects an amplitude wave that is generated when an alternating current side including the electric motor (10) is suffering a ground fault, and that extracts the envelope of the amplitude wave; a measurement circuit (42) that measures the voltage level of the envelope; and a determination circuit that makes a decision as to whether or not a ground fault has occurred on the alternating current side by comparing together the voltage level measured by the measurement circuit (42) and a ground fault decision value.
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a measurement circuit (42) that measures the voltage level of the envelope; and a determination circuit that makes a decision as to whether or not a ground fault has occurred on the alternating current side by comparing together the voltage level measured by the measurement circuit (42) and a ground fault decision value.</description><language>eng ; fre ; ger</language><subject>MEASURING ; MEASURING ELECTRIC VARIABLES ; MEASURING MAGNETIC VARIABLES ; PHYSICS ; TESTING</subject><creationdate>2011</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&amp;date=20110413&amp;DB=EPODOC&amp;CC=EP&amp;NR=2309280A1$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,776,881,25542,76289</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&amp;date=20110413&amp;DB=EPODOC&amp;CC=EP&amp;NR=2309280A1$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>YANAI, TAKAO</creatorcontrib><creatorcontrib>YOSHIDA, TAKESHI</creatorcontrib><title>Ground fault sensing device</title><description>A ground fault sensing device for a drive system that converts direct current electrical power from a direct current power supply (30) into alternating current electrical power and drives an electric motor (10) with that alternating current electrical power, comprises: an extraction circuit (41) that is connected to a power supply line of the direct current power supply (30) via a coupling capacitor, that detects an amplitude wave that is generated when an alternating current side including the electric motor (10) is suffering a ground fault, and that extracts the envelope of the amplitude wave; 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a measurement circuit (42) that measures the voltage level of the envelope; and a determination circuit that makes a decision as to whether or not a ground fault has occurred on the alternating current side by comparing together the voltage level measured by the measurement circuit (42) and a ground fault decision value.</abstract><oa>free_for_read</oa></addata></record>
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subjects MEASURING
MEASURING ELECTRIC VARIABLES
MEASURING MAGNETIC VARIABLES
PHYSICS
TESTING
title Ground fault sensing device
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