IEEE Std C57.12.60:2020 pdf download.IEEE Standard for Thermal Evaluation of Insulation Systems for Dry-Type Power and Distribution Transformers.
This test procedure for the thermal evaluation of insulation systems of dry-type power and distribution transformcrs is to be used for determining the temperature classification and modification of the insulation systems. This standard shall apply to all dry-type transformers with a voltage of 601 V or higher in the highest voltage winding except as follows:
a) Instrument transformers
b) Step- and induction-voltage regulators
c) Arc-furnace transformers
d) Rectifier transformers
e) Specialty and general-purpose transformers
f) Mine transformers
g) Testing transformers
h) Welding transformers
NOTE—Where IEEE standards do not exist for the transformers mentioned above or for other special transformers, this standard may be applicable as a whole or in parts subject to agreement between the parties responsible for the application and for the design of the transformer.
1.2 Purpose
The purpose of this test procedure is to establish a uniform method for the following:
a) Acquiring data used to determine the temperature classification of an insulation system
b) Acquiring data that may be used as a basis for a loading guide, such as IEEE Std C57.961
c) Modifying an established electrical insulation system
1.3 Word usage
The word shall indicates mandatory requirements strictly to be followed in order to conform to the standard
and from which no deviation is permitted (shall equals is required tO).4’5
The word should indicates that among several possibilities one is recommended as particularly suitable, without mentioning or excluding others; or that a certain course of action is preferred but not necessarily required (should equals is recommended that).
The word may is used to indicate a course of action permissible within the limits of the standard (may equals is permitted to).
The word can is used for statements 01’ possibility and capability, whether material, physical, or causal (can equals is able to).
2. Normative references
The following referenced documents are indispensable for the application of this document (i.e., they must be understood and used, so each referenced document is cited in text and its relationship to this document is explained). For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments or corrigenda) applies.
ANSI C57. 12.55, American National Standard for Transformers—Used in Unit Installations, Including Unit Substations—Conformance Standard.
ASTM D5374, Standard Test Methods for Forced-Convection Laboratory Ovens for Evaluation of Electrical Insulation.
ASTM D5642, Standard Test Method for Sealed Tube Chemical Compatibility Test.
ASTM E 104, Standard Practice for Maintaining Constant Relative Humidity by Means ofAqueous Solutions.
IEEE Std, IEEE Standard General Principles for Temperature Limits in the Rating of Electric Equipment and for the Evaluation of Electrical Insulation.
IEEE Std 101, IEEE Guide for the Statistical Analysis of Thermal Life Test Data.
IEEE Std 259, IEEE Standard Test Procedure for Evaluation of Systems of Insulation for Dry-Type Specialty and General-Purpose Transformers.
IEEE Std C57.12.O1, IEEE Standard General Requirements for Dry-Type Distribution and Power Transformers.
IEEE Std C57. 12.58, IEEE Guide for Conducting a Transient Voltage Analysis of a Dry-Type Transformer Coil.IEEE Std C57.12.60 pdf download.