Transcription of Application Note Earth Leakage Toroids - Blue Electronics
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Application Note Earth Leakage Toroids - Blue Electronics
ELCB003 RV 3 22/11/99 CRN: 4473 AMPCONTROL CSM Pty Limited ACN 000 770 141250 Macquarie Road Warners Bay NSW 2282 Phone: (02) 4956 5899 Fax: (02) 4956 5985technicalApplication NoteEarth Leakage Toroids1. IntroductionToroids (current transformers) are not ideal devicesand if correct procedures are not followed duringinstallation nuisance tripping can result. If, forexample, we consider a single-phase Earth leakagesystem where active and neutral pass through a toroidthen at all times currents in the two wires are equaland opposite so that the net current through the toroidis zero. An ideal current transformer would have all ofthe flux from each wire contained in the core and sowould accurately add the opposing fluxes to get a netresult of zero.
ELCB003 RV 3 22/11/99 CRN: 4473 AMPCONTROL CSM Pty Limited ACN 000 770 141 250 Macquarie Road Warners Bay NSW 2282 Phone: (02) 4956 5899 Fax: (02) 4956 5985 technical
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