PELS ETTC Standard 269

Standard 266-1969

IEEE Test Procedure for Evaluation of Insulation Systems for Electronics Power Transformers

Working Group Chairman: Paul Goethe

Phone: 440-238-0700
email: scjx12a@prodigy.com

Status: Withdrawn, Photocopy available from IEEE Standards Archives

Scope:

The intent of this test procedure is to establish a uniform method by which the life of electronics transformer insulation system can be compared. Thermal degradation is generally one of the major factors affecting the life of most insulating materials. It was chosen to be the major environmental factor in this test procedure. Other environmental factors, such as vibration, thermal shock and moisture, have been included to simulate operating conditions. Thes factors have been chosen in such a way as to develop and disclose promptly any significant weaknesses during the temperature aging of an insulating system.

Section 1. Insulation Test Specimens. Describes the types of insulation specimens suitable for use in the evaluation tests.

Section 2. Test Cycle. Recommends the test cycle for use in the insulation evaluation tests. The cycle consists of a series of exposures to heat, vibration, thermal shock, moisture and voltages to which the test specimen may be subjected to represent the cumulative effects of long service, under accelerated conditions. Information is included for selecting varying test conditions for several different transformer applications.

Section 3 Interpretation of Data. Gives information on establishing the criteria of failure, methods for analyzing test results and a guide for interpreting test results.

It is recognized that some transformers may have special requirements other than those included in the procedure. In these cases, special tests should be added to the test cycle. It is all-important that when insulation systems are compared, the test samples must be subjected to precisely the same test cycle.

The test procedure provides a statistical method for establishing a life-temperature relationship of an insulation system. The life-temperature relationship is relative. To have any significance,, it must be backed up with adequate field service data or be compared to similar life test data of insulation system with known service reliability

This test procedure is intended to be an evaluation test and not a production inspection or acceptance test.

Historical Note: (To Be Provided)

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