IEEE 1276-1997 pdf download IEEE Guide for the Application of High-Temperature Insulation Materials in Liquid-Immersed Power Transformers
1.1 Scope
Ihis guide provides technical information related to liquid-immersed power transformers insulated withhigh-temperature materials.
Guidelines are provided for applying existing qualifed high-temperature materials to insulationsystems suitable for high-temperature liquid-immersed power transformers.
Recommendations are made regarding the loading of high-temperature liquid-immersed powertransformers.
Technical information is provided for insulation-syste temperature ratings and test procedures forqualifying new high-temperature materials as they become available.
No specific guidance is provided on insulating fluids other than mineral oil. This subject is to be covered in afuture revision of this guide once more field experience is available using fluids other than mineral oil incombination with high-temperature solid materials.
1.2 Purpose
This guide is intended as a first step in the direction of standardizing the application of high-temperatureinsulation systems in transformers using insulation materials such as aramid papers, aramidtransformerboards,high-temperature enamels, and hybrid systems that include both high-temperaturematerials and cellulose materials. It provides technical information for the transformer designer as well asfor the transformer user.
2. References
This guide should be used in conjunction with the following publications. When the following publicationsare superseded by an approved revision, the latest revision shall apply.
IEEE Std C57.12.00-1993, 1EEE Standard General Requirements for Liquid-Immersed Distribution, Power,and Regulating Transformers (ANSI).
IEEE Std C57.12.90-1993, 1EEE Standard Test Code for Liquid-lmmersed Distribution, Power,andRegulating Transformers, and IEEE Guide for Short-Circuit Testing of Distribution and Power Transformers(ANSI)
IEEE Std C57.91-1995,EEE Guide for Loading Mineral-Oil-Immersed Transformers (ANSI).
EEE Std C57.100-1986 (Reaff 1992), EEE Standard Test Procedures for Thermal Evaluation of Oil-Immersed Distribution Transformers (ANSI).
EEE Std C57.104-1991 EEE Guide for the Interpretation of Gases Generated in Oil-ImmersedTransformers (ANSI).
3. Definitions
This clause defines terms as they are used in this guide. The term “transformer”refers to liquid-immersedpower transformers, unless an alternate meaning is specified.
3.1 aramid: A manufactured material in which the base polymer is a long-chain synthetic polyamide with atleast 85% of the amide linkages attached directly to two aromatic rings. Paper and transformerboard aremade from this material and have been shown to be suitable for use in high-temperature and hybrid hightemperature insulation systems.
3.2 average winding temperature: The average temperature of the winding as determined from the ohmicresistance measured across the terminals of the winding, in accordance with the cooling curve procedurespecified in IEEE Std C571290-1993
3.3 average winding temperature rise (A0): The arithmetic difference between the average windingtemperature and the average temperature of the air surrounding the transformer.Also.“rise.”unlessotherwise stated, will refer to the average winding temperature rise.
3.4 cellulose: The term celluloseunless otherwise stated, refers to unbleached kraft insulation materialfrom which paper and transformerboard are made, that is suitable for use in 65 °C average windingtemperature rise insulation systems.
IEEE 1276-1997 pdf download
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