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

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

The ASTM D150 standard covers the determination of the relative permittivity, dissipation factor, loss index, power factor, phase angle, and loss angle of samples of solid electrical insulating materials when the standards used are bulk impedances. The addressed frequency range extends from 1 Hz to several hundred megahertz.

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

Permeability, insulating materials are generally used in two different ways: to support and insulate components of an electrical network from each other and from the ground, and to act as a capacitor's dielectric. For initial use, it is generally desirable that the capacitance of the support be as small as possible, consistent with acceptable mechanical, chemical and heat resistant properties. A low permeability value is therefore desirable. For the latter use it is desirable to have a high permittivity value so that the capacitor is as small as physically possible. Interpass values ​​are sometimes used to rate voltages at the edge or end of a conductor to minimize ac corona.

AC Loss, in both cases (as electrical insulation and capacitor dielectric) the ac loss generally needs to be small to both reduce the heating of the material and minimize its effect on the rest of the network. In high frequency applications, a low loss index value is particularly desirable, as the dielectric loss directly increases with frequency for a given loss index value. In certain dielectric configurations, such as those used in termination bushings and cables for testing, an increased loss from increased conductivity is sometimes added to control the voltage gradient. It is potentially useful to also consider dissipation factor, power factor, phase angle, or dissipation angle when comparing materials with approximately the same permittivity, or using any material under conditions where its permittivity remains essentially constant.

Correlation is useful when sufficient correlation data is available, dissipation factor or power factor, to indicate properties of a material such as dielectric degradation, moisture content, degree of curing, and degradation from any cause. However, it is possible that deterioration due to thermal aging will not affect the dispersion factor unless the material is subsequently exposed to moisture. While the initial value of the scatter factor is important, the change in scatter factor with aging is often much more significant.

These test methods provide general information about various electrodes, apparatus and measurement techniques. It can be applied directly to the material to be tested, for a reader interested in issues related to a particular material.

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

Our organization also provides testing services within the scope of Standard Test Methods for AC Loss Characteristics and Permeability (Dielectric Constant) of ASTM D150 Solid Electrical Insulation, within the framework of laboratory testing services.

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