ASTM D3756-18
Standard Test Method for Evaluation of Resistance to Electrical Breakdown by Treeing in Solid Dielectric Materials Using Diverging Fields

Standard No.

ASTM D3756-18

Release Date

2018

Published By

American Society for Testing and Materials (ASTM)

Latest

ASTM D3756-18

Scope

1.1 This test method covers the evaluation and comparison of the resistance of solid organic dielectric materials to the initiation or growth, or both, of tubular tree-like channels resulting from partial discharge (corona) and molecular decomposition that occur in the region of very high, diverging electric fields.3,4 1.2 This test method is primarily for use at a power frequency of 50 or 60 Hz. 1.3 The test is able to be carried out at room temperature or temperatures above or below room temperature. The temperature shall not exceed the softening or melting point of the sample material. 1.4 This test method can be used for any solid material into which needles can be cast, molded, or inserted with heat after molding. The resistance to tree initiation is measured by the double-needle characteristic voltage, which is only applicable to non-opaque materials so that tree can be observed optically. The resistance to tree initiation and growth is reported by the double-needle voltage life, which is applicable to both opaque and non-opaque materials. 1.5 The values stated in SI units are to be regarded as the standard. 1.6 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the 1 This test method is under the jurisdiction of ASTM Committee D09 on Electrical and Electronic Insulating Materials and is the direct responsibility of Subcommittee D09.12 on Electrical Tests. Current edition approved Nov. 1, 2018. Published November 2018. Originally approved in 1990. Last previous edition approved in 2010 as D3756 – 97 (2010). DOI: 10.1520/D3756-18. 2 Symposium on Engineering Dielectrics, ASTM STP 783, ASTM, 1982, and Symposium on Engineering Dielectrics, ASTM STP 926, ASTM, 1986. 3 W. D. Wilkens, Chapter 7, “Statistical Methods for the Evaluation of Electrical Insulating Systems,” Engineering Dielectrics, Vol IIB, Electrical Properties of Solid Insulating Materials, Measurement Techniques, R. Bartnikas, Editor, ASTM STP 926, ASTM, Philadelphia, 1987. 4 R. M. Eichorn, Chapter 4, “Treeing in Solid Organic Dielectric Materials,” Engineering Dielectrics, Vol IIA, Electrical Properties of Solid Insulating Materials: Molecular Structure and Electrical Behavior, R. Bartnikas and R. M. Eichorn, Editors, ASTM STP 783, ASTM Philadelphia, 1983. Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. 1 Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

ASTM D3756-18 Referenced Document

• ASTM D149 Standard Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at Commercial Power Frequencies
• ASTM D1711 Standard Terminology Relating to Electrical Insulation
• ASTM D1928 Standard Practice for Preparation of Compression-Molded Polyethylene Test Sheets and Test Specimens

ASTM D3756-18 history

• 2018 ASTM D3756-18 Standard Test Method for Evaluation of Resistance to Electrical Breakdown by Treeing in Solid Dielectric Materials Using Diverging Fields
• 1997 ASTM D3756-97(2010) Standard Test Method for Evaluation of Resistance to Electrical Breakdown by Treeing in Solid Dielectric Materials Using Diverging Fields
• 1997 ASTM D3756-97(2004) Standard Test Method for Evaluation of Resistance to Electrical Breakdown by Treeing in Solid Dielectric Materials Using Diverging Fields
• 1997 ASTM D3756-97 Standard Test Method for Evaluation of Resistance To Electrical Breakdown By Treeing In Solid Dielectric Materials Using Diverging Fields