ASTM-D149:2004 Edition

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D149-97a(2004) Standard Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at Commercial Power Frequencies

Published By	Publication Date	Number of Pages
ASTM	2004	13

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Description

ASTM D149-97a-Reapproved2004

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

ASTM D149

Scope

1.1 This test method covers procedures for the determination of dielectric strength of solid insulating materials at commercial power frequencies, under specified conditions.^,

1.2 Unless otherwise specified, the tests shall be made at 60 Hz. However, this test method may be used at any frequency from 25 to 800 Hz. At frequencies above 800 Hz, dielectric heating may be a problem.

1.3 This test method is intended to be used in conjunction with any ASTM standard or other document that refers to this test method. References to this document should specify the particular options to be used (see ).

1.4 It may be used at various temperatures, and in any suitable gaseous or liquid surrounding medium.

1.5 This test method is not intended for measuring the dielectric strength of materials that are fluid under the conditions of test.

1.6 This test method is not intended for use in determining intrinsic dielectric strength, direct-voltage dielectric strength, or thermal failure under electrical stress (see Test Method D 3151).

1.7 This test method is most commonly used to determine the dielectric breakdown voltage through the thickness of a test specimen (puncture). It may also be used to determine dielectric breakdown voltage along the interface between a solid specimen and a gaseous or liquid surrounding medium (flashover). With the addition of instructions modifying Section , this test method may be used for proof testing.

1.8 This test method is similar to IEC Publication 243-1. All procedures in this method are included in IEC 243-1. Differences between this method and IEC 243-1 are largely editorial.

This standard does not purport to address all of the safety concerns, 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. Specific hazard statements are given in Section . Also see .

Keywords

breakdown; breakdown voltage; calibration; criteria of breakdown; dielectric breakdown voltage; dielectric failure; dielectric strength; electrodes; flashover; power frequency; process-control testing; proof testing; quality-control testing; rapid rise; research testing; sampling; slow rate-of-rise; step-by-step; surrounding medium; voltage withstand

ICS Code

ICS Number Code 83.060 (Rubber)

DOI: 10.1520/D0149-97AR04

PDF Catalog

PDF Pages	PDF Title
1	Scope Referenced Documents
2	Terminology Summary of Test Method Significance and Use Apparatus
3	TABLE 1
5	Hazards Sampling Test Specimens
6	Calibration Conditioning Procedure FIG. 1
7	FIG. 2 FIG. 3
8	Calculation Report Precision and Bias TABLE 2
9	Keywords X1. SIGNIFICANCE OF THE DIELECTRIC STRENGTH TEST X1.1 Introduction X1.2 Postulated Mechanisms of Dielectric Breakdown X1.3 Nature of Electrical Insulating Materials X1.4 Influence of Test and Specimen Conditions
10	X1.5 Evaluation
11	X2. STANDARDS REFERRING TO TEST METHOD D149 X2.1 Introduction
12	TABLE X2.1

Additional information

Standard Title	D149-97a(2004) Standard Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at Commercial Power Frequencies
Published Code	ASTM
Publication Date	2004
Pages Count	13