GENERAL PRINCIPLES FOR TEMPERATURE LIMITS IN THE RATING OF ELECTRICAL EQUIPMENT AND FOR THE EVALUATION OF ELECTRICAL INSULATION
Institute of Electrical & Electronics Engineers
1 Overview
1.1 Scope
1.2 Purpose
2 References
3 Definitions
3.1 General definitions
3.2 Definitions related to electric equipment
3.3 Definitions related to the evaluation of thermal
capability
4 General concepts
4.1 Temperature measurement
4.2 Additional aging factors
4.3 Limits of temperature
5 Basic considerations in the preparation of standards
5.1 Service experience
5.2 General principles for temperature limits
5.3 Purpose of life testing
6 Evaluation of the thermal capability of EIM
6.1 Thermal aging
6.2 TI and relative temperature index (RTI) of an EIM
6.3 Determination of TI for EIM by test
6.4 Determination of material TI by experience
7 Limiting temperatures and their measurement for EIS
7.1 Derivation of temperature rise
7.2 Methods of temperature determination
7.3 Effects of altitude
8 Thermal evaluation of EIS
8.1 Temperature classification of EIS
8.2 EIS classes
8.3 Thermal evaluation test procedures for EIS
Annex A (informative) - Illustration of thermal endurance
graph, TI, RTI, and HIC
Annex B (informative) - Bibliography
Intended to serve in the preparation of standards that are principally concerned with the thermal endurance of EIM and simple combinations thereof, with the establishment of limiting temperatures of EIS, and with the provision of general principles for thermal classification of EIS.
| Document Type | Standard |
| Status | Current |
| Publisher | Institute of Electrical & Electronics Engineers |
| Supersedes |
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