Reactions between the liquid insulation and the copper conductors in power transformers and other electrical apparatus may lead to the formation of dissolved and suspended copper in the insulating oil. In this work a study concerning the correlation between the copper form and the dielectric properties of the fluid is presented. In particular, to determine the total copper content in oil and consequently to discriminate by subtraction the presence of particulate copper, we optimized a method of oil mineralization. Moreover, by filtering the oils with PTFE filters (0.45, 1 and 5 μm), the dimension of suspended copper content has been quantified and discriminated from the dissolved one: in such way, we investigated the influence of particulate copper on the characteristics of the oils and we determined the physical form that mostly affect the dielectric properties.

Copper Contaminated Insulating Mineral OilsTesting and Investigations

DE CARLO, Rosa Maria;BRUZZONITI, Maria Concetta;SARZANINI, Corrado;
2013-01-01

Abstract

Reactions between the liquid insulation and the copper conductors in power transformers and other electrical apparatus may lead to the formation of dissolved and suspended copper in the insulating oil. In this work a study concerning the correlation between the copper form and the dielectric properties of the fluid is presented. In particular, to determine the total copper content in oil and consequently to discriminate by subtraction the presence of particulate copper, we optimized a method of oil mineralization. Moreover, by filtering the oils with PTFE filters (0.45, 1 and 5 μm), the dimension of suspended copper content has been quantified and discriminated from the dissolved one: in such way, we investigated the influence of particulate copper on the characteristics of the oils and we determined the physical form that mostly affect the dielectric properties.
2013
20
2
557
563
Copper in oil analysis; non-sulfur corrosion
R.M. De Carlo; M.C. Bruzzoniti; C. Sarzanini; R. Maina; V. Tumiatti
File in questo prodotto:
File Dimensione Formato  
IEEE_Published version_2013.pdf

Accesso riservato

Tipo di file: PDF EDITORIALE
Dimensione 3.98 MB
Formato Adobe PDF
3.98 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
OpenAcess_IEEE_2013_20_557.pdf

Accesso aperto

Tipo di file: POSTPRINT (VERSIONE FINALE DELL’AUTORE)
Dimensione 508.97 kB
Formato Adobe PDF
508.97 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/133694
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 24
  • ???jsp.display-item.citation.isi??? 20
social impact