IEC TS 62332-1 pdf download

IEC TS 62332-1 pdf download.Electrical insulation systems (EIS) – Thermal evaluation of combined liquid and solid components
1 Scope
This part of IEC/TS 62332 is applicable to EIS containing solid and liquid components where the thermal stress is the dominant ageing factor, without restriction to voltage class. This part specifies a dual-temperature test procedure for the thermal evaluation and qualification of electrical insulation systems (EIS).
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply, some of which are taken from IEC 60505. 3.1 electrical insulation system EIS insulating structure containing one or more electrical insulating materials (EIM) together with associated conducting parts employed in an electrotechnical device [IEC 60505:2004, definition 3.1 .1 ] NOTE EIMs with different temperature indices (ATE RTE according to IEC 6021 6-5) may be combined to form an EIS, which has a thermal class that may be higher or lower than that of any of the individual components according to IEC 60505.3.2 candidate EIS EIS under evaluation to determine its service capability (thermal) 3.3 reference EIS evaluated and established EIS with either a known service experience record or a known comparative functional evaluation as a basis 3.4 thermal class designation of an EIS that is equal to the numerical value of the maximum temperature in degrees Celsius for which the EIS is appropriate according to Table 1 of IEC 60085:2007 NOTE An EIS may be subjected to operating temperatures exceeding its thermal class, which can result in shorter expected life. 3.5 EIS assessed thermal endurance index EIS ATE numerical value of the temperature in degrees Celsius for the reference EIS as derived from known service experience or a known comparative functional evaluation 3.6 EIS relative thermal endurance index EIS RTE numerical value of the temperature in degrees Celsius for the candidate EIS which is relative to the known EIS ATE of a reference EIS, when both EIS are subjected to the same ageing and diagnostic procedures in a comparative test 3.7 test object piece of original equipment, a representation (model) of equipment, a component of or part of equipment, including the EIS, intended for use in a functional test 3.8 thermal ageing factor thermal stress that causes irreversible changes in the EIS 3.9 diagnostic test periodic application of a specified level of a diagnostic factor to a test object to determine whether the end-point criterion has been reached3.1 0 end-point criterion selected value of either a property or a change of property that defines the end of a component’s life [IEC 61 857-1 :2008, definition 3.1 1 , modified] 3.1 1 end-of-life end of a test object’s life, as determined by any selected component meeting its end-point criterion
4 Thermal ageing test apparatus
4.1 General description The thermal ageing test apparatus shall be designed to allow the separate ageing of solid and liquid components. The reference and candidate EIS shall be exposed to test periods at selected elevated temperatures. These test periods consist of a specific time exposure at the selected temperature followed by diagnostic tests. The test system consists of the following elements: • ageing cells; • power supply; • control system; • safety system; • sampling system; • monitoring/data collection system. 4.2 Construction of the test apparatus 4.2.1 Ageing cells Each ageing cell is a container constructed of stainless steel, the size to be determined by the size of the test object. The cell volume shall consider the space required for thermal expansion of the liquid at ageing temperatures. The two ends of the cell shall be fitted with removable, sealable bolt-on covers. The test object is mounted within the ageing cell. Ports shall be provided for • sampling of the liquid, • pass-through of electrical circuits for heating of the active parts, • monitoring and control elements, • immersion heaters, • gas blanketing and associated pressure relief system. The design of the ageing cell shall be configured to maintain the thermocouples controlling the liquid and the solid component of the test objects immersed in the liquid under all ageing temperatures. See also 5.3.3. For specific details, see Figure 1 .