IEEE 117-2015

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IEEE Standard Test Procedure for Thermal Evaluation of Systems of Insulating Materials for Random-Wound AC Electric Machinery

Published By	Publication Date	Number of Pages
IEEE	2015	34

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Description

Revision Standard – Active. The standard test procedure for the thermal evaluation and qualification of electrical insulation systems (EISs) for random-wound ac electric machinery, where thermal degradation is the dominating aging factor, is described. The relative thermal performance of a candidate EIS is compared to that of a reference EIS. Insulation systems for such machinery with input voltage of up to 600 V at 50/60 Hz are described in this standard. A statistical method for establishing a relative life-temperature relationship for an insulation system is also described. To have any significance, the reference insulation system must be supported with adequate field service data. Evaluation of insulation systems for use in air-cooled, random-wound ac electric machinery with “usual service conditions” is this procedure’s intent. This procedure, on its own, does not cover insulation systems such as exposure to conducting contaminates, radiation, inverter applications, or operation in oils, refrigerants, or other media that potentially degrades insulating materials.

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PDF Pages	PDF Title
1	IEEE Std 117™-2015 Front cover
2	Title page
4	Important Notices and Disclaimers Concerning IEEE Standards Documents
7	Participants
8	Introduction
9	Contents
10	IMPORTANT NOTICE 1. Overview 1.1 Scope 1.2 Purpose
11	1.3 General conditions 1.4 Methods of evaluation 2. Normative references
12	3. Definitions, abbreviations, and acronyms 3.1 Definitions 3.2 Abbreviations and acronyms 4. History 4.1 Background information
13	4.2 Methods of evaluation
14	5. Motorettes 5.1 Insulation test specimens
18	5.2 Test exposures for motorette testing
22	5.3 Voltage checks for motorette testing
23	5.4 Failure criteria for motorette testing 6. Motors 6.1 Test procedure for motors
24	6.2 Motor models
26	6.3 Test exposures for motor testing
28	6.4 Operating cycle sequence testing
29	7. Analysis of data 7.1 Data 7.2 Analysis 7.3 Comparison 7.4 Extrapolation 7.5 Nonlinear or dissimilar curves
30	Annex A (informative) Thermal-class definitions
32	Annex B (informative) Bibliography
34	Back cover

Additional information

Standard Title	IEEE Standard Test Procedure for Thermal Evaluation of Systems of Insulating Materials for Random-Wound AC Electric Machinery
Published Code	IEEE
Publication Date	2015
Pages Count	34

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IEEE 117-2015

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