IEEE Approves Revised Standard on Evaluating Insulation Aging in AC Machinery - IEEE 434
March 15, 2007 // Published as a news service by IHS
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The Institute of Electrical and Electronic Engineers (IEEE) approved the revision of a standard on how to evaluate the aging of insulation in air conditioning (AC) machinery due to stress.
It also began to revise a standard for the thermal evaluation of insulating materials in AC machinery.
The IEEE revised IEEE 434 - Guide for Functional Evaluation of Insulation Systems for AC Electric Machines Rated 2300 V and Above by adding definitions that clarify the standard and including more specific test details.
The standard gives winding manufacturers a way to evaluate and compare insulation systems used or proposed for large AC electric machines.
It establishes a basis for evaluating the aging of the electrical insulation due to electrical, thermal, mechanical and environmental stresses that can irreversibly change insulation and lead to failure.
The IEEE began to revise IEEE P117 - Standard Test Procedure for Thermal Evaluation of Systems of Insulating Materials for Random-Wound AC Electric Machinery, which is a reference document for other IEEE, Underwriters Laboratories (UL) and International Electrotechnical Commission (IEC) standards.
The revision to IEEE P117 will update it to the correct IEEE format, harmonize it to other standards and add the relevant section of IEEE 110 as an appendix. This standard applies where thermal degradation is the dominant aging factor and compares the thermal performance of a candidate insulation system with an input voltage of up to 1000 volts at 50/60 hertz to that of a reference.
Source: Institute of Electrical and Electronic Engineers (IEEE).