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“Cahiers Techniques” is a collection of documents intended for engineers andtechnicians, people in the industry who are looking for more in-depthinformation in order to complement that given in product catalogues.Furthermore, “Cahiers Techniques” are often considered as helpful “tools” fortraining courses.They provide knowledge on new technical and technological developments inthe electrotechnical field and electronics. They also provide betterunderstanding of various phenomena observed in electrical installations,systems and equipment.Each “Cahier Technique” provides an in-depth study of a precise subject inthe fields of electrical networks, protection devices, monitoring and controland industrial automation systems.The latest publications can be downloaded from the Schneider ElectricInternet web site.Code: http://www.schneider-electric.comSection: The expert’s placePlease contact your Schneider Electric representative if you want either a“Cahier Technique” or the list of available titles.The “Cahiers Techniques” collection is part of Schneider Electric’s“Collection Technique”.ForewordThe author disclaims all responsibility subsequent to incorrect use ofinformation or diagrams reproduced in this document, and cannot be heldresponsible for any errors or oversights, or for the consequences of usinginformation or diagrams contained in this document.Reproduction of all or part of a “Cahier Technique” is authorized with theprior consent of the Scientific and Technical Division. The statement“Extracted from Schneider Electric “Cahier Technique” no. ....” (please specify)is compulsory.
no. 202The singularities of thethird harmonicJacques SCHONEKAn ENSEEIHT engineer with a PhD in Engineering from the Universityof Toulouse, he was involved in designing variable speed drives forthe Telemecanique brand from 1980 to 1995.Subsequently he became the manager of the Harmonic Filteringgroup.He is currently responsible for Electrotechnical Applications andNetworks in the Advanced Design Office of Schneider Electric’s LowVoltage Power Division.ECT 202(e) first issued February 2001
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Page 9 and 10: 2 Overload on the neutral conductor
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Page 13 and 14: 3 The third harmonic in transformer
Page 15 and 16: (A)300200I3I3I3Ih1000-100-200-3000
Page 17 and 18: Appendix: Calculating Fourier coeff
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