1. Scope

1.1 These test methods cover the preparation and electrical testing of insulating paper and board impregnated with a liquid dielectric. They provide for measuring dissipation factor (power factor), permittivity (dielectric constant), and dielectric strength. Where these methods state only 'paper,' the same procedure shall apply to board.

1.2 These test methods have been found practicable for papers having nominal thickness of 0.05 mm (2 mil) and above. They have been used successfully for insulating board as thick as 6 mm (1/4 in.) when care is taken to assure the specimen geometry necessary for valid measurement of dielectric properties. Suitable geometry depends on the electrode system used. Rigid solid opposing electrodes require flat specimens that have essentially parallel surfaces.

1.3 The values stated in SI units are to be regarded as the standard.

1.4 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. >

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D117 Guide for Sampling, Test Methods, and Specifications for Electrical Insulating Oils of Petroleum Origin

D149 Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at Commercial Power Frequencies

D150 Test Methods for AC Loss Characteristics and Permittivity (Dielectric Constant) of Solid Electrical Insulation

D202 Test Methods for Sampling and Testing Untreated Paper Used for Electrical Insulation

D257 Test Methods for DC Resistance or Conductance of Insulating Materials

D924 Test Method for Dissipation Factor (or Power Factor) and Relative Permittivity (Dielectric Constant) of Electrical Insulating Liquids

D1711 Terminology Relating to Electrical Insulation

D1816 Test Method for Dielectric Breakdown Voltage of Insulating Oils of Petroleum Origin Using VDE Electrodes

D1933 Specification for Nitrogen Gas as an Electrical Insulating Material

D3394 Test Methods for Sampling and Testing Electrical Insulating Board

D3426 Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials Using Impulse Waves

Keywords

board; dielectric strength; dissipation factor; drying; impulse strength; oil impregnation; paper permittivity; pressboard; vacuum drying; Dielectric breakdown voltage; Electrical insulating paper/paperboard; Electrical properties; Impregnated dielectric materials; Liquid dielectric; Oil impregnation; Permittivity (dielectric constant)--electrical insulating materials; Power factor; Pressboard (electrical insulating); Specimen preparation (for testing)--electrical insulation; Vacuum drying; Board;

ICS Code

ICS Number Code 29.035.10 (Paper and board insulating materials)

DOI: 10.1520/D2413-99R05

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