Methods of testing insulating materials. Recommended methods for the determination of the permittivity and dielectric dissipation factor of electrical insulating material at power, audio and radio freq.

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Main informations

Collections

National standards and national normative documents

Publication date

May 1970

Number of pages

28 p.

Reference

NF C26-230

ICS Codes

29.035.01 Insulating materials in general

Classification index

C26-230

Print number

1 - 26/12/1997

International kinship

IEC 60250:1969

Standard replaced by (1)

NF EN IEC 62631-2-1

April 2018

Standard Current

Dielectric and resistive properties of solid insulating materials - Part 2-1 : relative permittivity and dissipation factor - Technical frequencies (0,1 Hz to 10 MHz) - AC Methods

Le présent document décrit des méthodes d'essai pour déterminer les propriétés de la permittivité et du facteur de dissipation de matériaux isolants solides (méthodes en courant alternatif de 0,1 Hz à 10 MHz) .

Table of contents

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AVANT-PROPOS
1 Objet, domaine d'application et validité.
2 Définitions.
3 Utilisations et propriétés des isolants électriques.
4 Forme d'éprouvettes et systèmes d'électrodes.
5 Choix des méthodes de mesure.
6 Mode opératoire.
7 Résultats.
8 Procès-verbal.
ANNEXE : Dispositifs de mesure
1 Pont de Shering.
2 Pont "à transformateur" (à bras de proportion inductifs).
3 Ponts en double "T".
4 Méthode de résonance (acuimètre).
5 Méthode de variation de la susceptance (méthode de variation de la réactance).
6 Blindage.
7 Oscillateurs et détecteurs de ponts.
8 Gamme de fréquences.
TABLEAU I. - Calcul de la capacité dans le vide et des corrections de bord.
TABLEAU II. - Calcul de la capacité de l'éprouvette - Electrodes micrométriques en contact avec l'éprouvette.
TABLEAU III. - Calcul de la permittivité relative et du facteur de dissipation - Electrodes sans contact direct.

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