Changes proposed for the IEC 93 standard concerning measurements of the volume and surface resistivites of solid dielectrics

• Autorzy: Lisowski M. , Skopec A. , Kacprzyk R.
• Konferencja: II International Conference on Advances in Processing, Testing and Application of Dielectric Materials, 15-17 September, Wrocław 2004
• Języki publikacji: EN

Abstrakty

EN

The IEC93 Standard, prepared by the International Electrotechnical Commission in 1980, sets up methods of measurements, determination and calculation of volume and surface resistivities of solid dielectrics. The document contains some editorial mistakes as well as content-related inaccuracies that require revision. Besides corrections of obvious editorial mistakes it is suggested to introduce some content-related improvements. The most important remarks given in the paper are associated with the following problems: 1) shunting of the current meter by the resitance between guarding and guarded electrodes; 2) significant influence of the electrodes made of conducting rubber on volume resistivity measurements results; 3) errors associated with application of simplified expressions tor resistivities calculations (volume resistivity for tubular samples, surface resistivity for samples with circular electrodes); 4) measuring electrode used for cylindrical samples; 5) increase of the effective surface of the measuring electrode (margin width determination and consideration). Finally, proposals of alterations of particular clauses of the standard, supplemented with appropriate justifications, were given in the paper.

Słowa kluczowe

EN

solid dielectrics; electrical resistivity; standards

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje
• Rocznik: 2004
• Tom: Vol. 40, nr 15
• Strony: 147--152
• Opis fizyczny: Bibliogr. 9 poz., rys., tab.

Twórcy

autor

Lisowski M.

• Electrotechnical Institute, Division of Electrotechnology and Material Science

autor

Skopec A.

• Electrotechnical Institute, Division of Electrotechnology and Material Science

autor

Kacprzyk R.

• Wroclaw University of Technology, Institute of Electrical Engineering Fundamentals

Bibliografia

• [1] LISOWSKI .M., Pomiary rezystywności i przenikalności elektrycznej dielektryków stałych. Oficyna Wydawnicza Politechniki Wrocławskiej. Wrocław 1994.
• [2] LISOWSKI M., GALIK G., LACUOWSKI A., Influence of the electric charge on the reliability of the PTFE of volume and surface resistivity measurements. International Conference on Advances in Processing, Testing and Applications of Dielectric Materials. APTADM'2001, Wrocław. Przegląd Elektrotechniczny 2001, p. 259 - 262.
• [3] LISOWSKI M., KACPRZYK R., Uncertainty evaluation problems in measurements of volume and surface resistivities. Proceedings of the IMEKO-TC7 Symposium „Measurement Science of the Information Era" Cracow 2002, p.82-87.
• [4] LISOWSKI M., KACPRZYK R., MOTYL E., GAŁĘZKI P., Space charge influence on the results of volume resistivity measurements in solid dielectrics. Proceedings, XVII IMEKO World Congress Metrology in the 3rd Millennium 2003, Dubrovnik, Croatia, p. 837 - 840.
• [5] DARIE A., Improving the repeatability of ultra-high resistance and resistivity measurement. Keithley White Paper 6517A. www.keithley.com
• [6] IEC 93: 1980 Methods of test for volume resistivity and surface resistivity of solid electrical insulating materials.
• [7] ASTM D 257-99, Standard test methods for dc resistance or conductance of insulating materials.
• [8] ENDICOTT H.S., Guard-gap correction for guarded electrode measurements and exact equations for the two-fluid method of measuring permittivity and loss. Journal of Testing and Evaluation, Vol. 4 (1976), No 3, p.188-195.
• [9] SKOPEC A., LISOWSKI M., Effective area of the guarded electrode in calculations of volume resistivity and electrical permittivity (will be published).