IEC 60505-2004 pdf – Evaluation and qualification of electrical insulation systems.
1 Scope This International Standard establishes the basis for estimating the ageing of electrical insulation systems (EIS) under conditions of either electrical, thermal, mechanical, environmental stresses or combinations of these (multifactor stresses). It specifies the principles and procedures that should be followed, during the development of EIS functional test and evaluation procedures, to establish the estimated service life for a specific EIS. This standard is for use by all IEC technical committees responsible for equipment having an EIS. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60068-2-1, Environmental testing – Part 2: Tests – Test A: Cold IEC 60068-2-2, Environmental testing – Part 2: Tests – Test B: Dry heat IEC 60068-2-14, Environmental testing – Part 2: Tests – Test N: Change of temperature IEC 60068-2-27, Environmental testing – Part 2: Tests – Test Ea and guidance: Shock IEC 60216-3, Electrical insulating materials – Thermal endurance properties – Part 3: Instructions for calculating thermal endurance characteristics IEC 60216-5, Electrical insulating materials – Thermal endurance properties – Part 5: Determination of relative thermal endurance index (RTE) of an insulating material IEC 60493-1, Guide for the statistical analysis of ageing test data – Part 1: Methods based on mean values of normally distributed test results IEC 60544-1, Electrical insulating materials – Determination of the effects of ionizing radiation– Part 1: Radiation interaction and dosimetry IEC 60664 (all parts), Insulation coordination for equipment within low-voltage systems
3 Terms and definitions For the purposes of this document, the following terms and definitions apply: 3.1 General terms 3.1.1 electrical insulation system EIS insulating structure containing one or more electrical insulating materials (EIM) together with associated conducting parts employed in an electrotechnical device 3.1.2 electrical insulating material EIM material with negligibly low electric conductivity, used to separate conducting parts at different electrical potentials [IEV 212-01-01:1990, modified] 3.1.3 reference EIS established EIS evaluated on the basis of either a known service experience record or a known comparative functional evaluation 3.1.4 candidate EIS EIS under evaluation to determine its service capability (with regard to electrical, thermal, mechanical, environmental or multifactor stresses) 3.1.5 intended life design life of an EIS under service conditions 3.1.6 estimated life expected service life derived from either service experience or the results of tests performed in accordance with appropriate evaluation procedures, or both, as established by the responsible organization or technical committee 3.1.7 evaluation establishment of relationships between service requirements and life data obtained from service experience analysis or from the results of functional tests 3.2 Terms related to service stresses and ageing 3.2.1 ageing stress electrical, thermal, mechanical or environmental stress whose action on an EIS causes irreversible property changes
3.2.3 factor of influence stress imposed by conditions of operation, environment or test that affects ageing or life of an EIS NOTE The term “factor of influence” denotes external factors (such as ambient temperature) inducing stress in the EIS as different from stress factors being part of the duty cycle of the equipment (e.g. temperature rise due to load). 3.2.4 service conditions combination of factors of influence and duty that are to be expected in a specific application of an electrical device 3.2.5 reference operating conditions service conditions of the equipment to which the test conditions of the functional test procedure are related 3.2.6 service requirements specified factors of influence, intended performance and duty of an electrical device 3.2.7 service experience the quantitative and/or qualitative record during service, with or without failure of an EIS 3.2.8 ageing irreversible changes of the properties of an EIS due to action by one or more factors of influence