IEEE C57.100-2011 pdf free.IEEE Standard Test Procedure for Thermal Evaluation of Insulation Systems for Liquid-Immersed Distribution and Power Transformers.
IEEE C57.100 applies to the insulation systems used in all liquid-immersed distribution and power transformers. This standard provides test procedures to evaluate the thermal aging characteristics of insulation systems used in liquid-immersed distribution or power transformers. The dielectric liquid is part of the insulation system.
1.2 Purpose
The objective of this test procedure is to establish uniform methods for investigating the effects of operating temperature on the life expectancy of liquid-immersed transformer insulation systems. The results of these test procedures are expected to
a) Provide the basis for the selection of a limiting hottest-spot temperature for rating purposes
b) Provide life curves that may serve as the basis for a guide for loading
c) Pcnnit the comparative evaluation of a proposed insulation system with reference to an industry- proven system that has been shown to be acceptable in service.
2. Normative references
The following referenced documcnts arc indispensable for the application of this document (i.e., thcy 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 rcferenccd document (including any amendments or corrigenda) applies.
IEC TS 62332-1-—Electrical Insulation Systems (EIS) —Thermal Evaluation of Combined Liquid and Solid Components—Part I: General Requirements)
IEEE Std C57.l2.O0Ih. IEEE Standard General Requirements for Liquid-Immersed Distribution. Power. and Regulating Transfonncrs.
IEEE SW C57.12.9OTM. iEEE Standard Test Code for Liquid-Immersed Distribution. Power, and Regulating Transfirnners.
IEEE SW C57.9l’, IEEE Guide for Loading Mineral-Oil-Immersed Transformers.
IEEE Std l, IEF.E General Principles for Temperature Limits in the Rating of Electrical Equipment and for the Evaluation of Electrical Insulation,
IEEE Std 99Th, IEEE Recommended Practice for the Preparation of Test Procedure for the Thermal Evaluation of Insulation Systems for Electric Equipment.
IEEE Std l0I, IEEE Guide for the Statistical Analysis of Thermal Life Test Data.
3. Definitions
For the purposes of this document, the following terms and definitions apply. The IEEE Siandurck Dictionary,- (JIo.c.carv of Tcrmx & DefInitions should be referenced for terms not defined in this clause.
3.1 Industry-proven insulation system
Decades of operating equipment manufactured using an insulation system including thermally upgraded krafi paper, ccllulosic prcssboard. and mineral oil has shown that a minimum life expectancy of at least 20.5 years(180 000 hours) may be assumed if the hottest-spot temperature, at rated load as defined in IEEE Std C57.l2.O0, is maintained. This proven insulation system includes a manufacturing process. which provides initial drying to a moisture content of 0.25% to 0.50% moisture by weight, and after processing. the insulation system will be sealed to prevent the ingress of air (oxygen) and moisture.
The minimum life expectancy curve from IEEE Std C57.12.00 to be used for comparison purposes is repeated here by Equation (I) and displayed in Figure 1.IEEE C57.100 pdf free download.