BS EN 60505-2004 pdf download.Evaluation and qualification of electrical insulation systems.
This BS EN 60505 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
3.3.10
end of life
value of either a property or a change of property defining the end of life of a test object in a functional test
3.3.11
test cycle
in a test, repetitive period of application of one or more factors of influence, either sequentially or simultaneously, and of diagnostic factors
3.3.12
subcycle
defined period within test cycle
NOTE The subcycte may be. for instance, a period of application of high temperature and humidity for influencing the system properties, or application of high voltage for diagnostic purposes
4 Ageing
4.1 Ageing mechanism
Ageing is defined as the irreversible changes of the properties of an EIS due to action by one or more factors of influence. Ageing stresses may cause either intrinsic or extrinsic ageing. In most EIS extrinsic ageing predominates. A schematic representation of the basic process is shown in Figure 1.BS EN 60505-2004 pdf download.

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