IEEE 259 Standard Test Procedure for Evaluation of Systems of Insulation for Dry-Type Specialty and General-Purpose Transformers

	Purchase Information Use this form to request purchase information on IEEE online subscriptions. IEEE Collections First Name: Last Name: Email address:

Document IEEE 259 is offered by IHS as part of an online subscription. This subscription contains many documents on the same topic.

You may also purchase this document alone from the IHS Standards Store.

IEEE 259 Document Information:

Title
Standard Test Procedure for Evaluation of Systems of Insulation for Dry-Type Specialty and General-Purpose Transformers

The Institute of Electrical and Electronics Engineers, Inc.

Publication Date:
Jun 26, 1999

Scope:

The intent of this standard is to establish a uniform method by which the thermal endurance of electrical insulation systems for dry-type specialty and general-purpose transformers can be compared. These insulation systems are intended for use in the types of transformers described in NEMA ST 1-1988¹ and NEMA ST 20-1992. In general, these dry-type transformers are used with the primary windings connected to secondary distribution circuits of 600 V nominal and below.

Thermal degradation generally is one of the principal factors affecting the function of most insulating materials. It is the principal environmental factor in this standard. Other environmental factors such as vibration, thermal shock, and moisture are included to simulate operating conditions. These factors have been chosen in such a way as to develop and promptly disclose any significant weakness during the temperature aging of an insulation system.

This standard provides a statistical method for establishing a life-temperature relationship for an insulation system. This life-temperature relationship is relative. To have any significance, it must be supported by adequate field service data or it must be compared to similar life test data for insulation systems with known field-service reliability.

Keywords:

dry-type

evaluation

aging

transformers

thermal

insulation system

About IHS
IHS (NYSE: IHS) is a leading global provider of critical technical information, decision-support tools and related services in a number of industries including aerospace and defense, automotive, construction, electronics, and energy. IHS serves customers ranging from large governments and multinational corporations to smaller companies and technical professionals in more than 100 countries. IHS been in business for more than 45 years and employ more than 2,300 people around the world.