IEC 61858 pdf – Electrical insulation systems – Thermal evaluation of modifications to an established wire-wound EIS

IEC 61858 pdf – Electrical insulation systems – Thermal evaluation of modifications to an established wire-wound EIS
1 scope
This International Standard lists the required test procedures for qualification of modificationsof an established electrical insulation system (EIS) with respect to its thermal classification.This standard is applicable to EIs used in wire-wound electrotechnical devices. The testprocedures are comparative in that the performance of a candidate EIS is compared to that ofa reference ElS，which has proven service experience in accordance with lEC 60505 or hasbeen evaluated by one of the procedures given in the lEC61857 series.
2Normative 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 editionof the referenced document (including any amendments) applies.
IEC 60085:2007,Electrical insulation – Thermal evaluation and designation
IEC 60172,Test procedure for the determination of the temperature index of enamelledwinding wires
IEC 60216-5，Electrical insulating materials – Thermal endurance properties – Part 5:Determination of relative thermal endurance index (RTE) of an insulating material
IEC 60317-3，Specifications for particular types of winding wires – Part 3: Polyesterenamelled round aluminium wire, class 155
IEC 60317-4，Specifications for particular types of winding wires – Part 4: Solderablepolyurethane enamelled round copper wire, class 130
IEC 60317-7，Specifications for particular types of winding wires – Part 7: Polyimideenamelled round copper wire, class 220
IEC 60317-8，Specifications for particular types of winding wires – Part 8: Polyesterimideenamelled round copper wire, class 180
IEC 60317-13，Specifications for particular types of winding wires – Part 13: Polyester orpolyesterimide overcoated with polyamide-imide enamelled round copper wire, class 200
IEC 60317-15,Specifications for particular types of winding wires – Part 15: Polyesterimideenamelled round aluminium wire, class 180
IEC 60317-16，Specifications for particular types of winding wires – Part 16: Polyesterenamelled rectangular copper wire,class 155
IEC 60317-19，Specifications for particular types of winding wires – Part 19: Solderablepolyurethane enamelled round copper wire,overcoated with polyamide, class 130
IEC 60317-23，Specifications for particular types of winding wires – Part 23: Solderablepolyesterimide enamelled round copper wire,class 180
IEC 60317-25，Specifications for particular types of winding wires – Part 25: Polyester orpolyesterimide overcoated with polyamide-imide enamelled round aluminium wire, class 200
IEC 60317-29，Specifications for particular types of winding wires – Part 29: Polyester orpolyesterimide overcoated with polyamide-imide enamelled rectangular copper wire, class 200
IEC 60317-30，Specifications for particular types of winding wires – Part 30: Polyimideenamelled rectangular copper wire, class 220
IEC 60317-34，Specifications for particular types of winding wires – Part 34: Polyesterenamelled round copper wire, class 130L
IEC 60317-42,Specifications for particular types of winding wires – Part 42: Polyester-amide-imide enamelled round copper wire, class 200
IEC 60317-46，Specifications for particular types of winding wires – Part 46: Aromaticpolyimide enameilled round copper wire, class 240
IEC 60317-47，Specifications for particular types of winding wires – Part 47: Aromaticpolyimide enameiled rectangular copper wire, class 240
IEC 60317-51，Specifications for particular types of winding wires – Part 51: Solderablepolyurethane enamelled round copper wire,class 180
IEC 60505,Evaluation and qualification of electrical insulation systems
IEC 61033，Test methods for the determination of bond strength of impregnating agents to anenamelled wire substrate
IEC 61857(all parts)，Electrical insulation systems – Procedures for thermal evaluation
IEC 61857-1，Electrical insulation systems – Procedures for thermal evaluation – Part 1:General requirements – Low voltage
3Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
electrical insulation systemEIS
insulating structure containing one or more electrical insulating materials (EIM) together withassociated conducting parts employed in an electrotechnical device
3.2
electrical insulating materialEIM
material with negligibly low electric conductivity, used to separate conducting parts at differentelectrical potentials
3.3
candidate EIS
EIs under evaluation to determine its service capability (thermal)
3.4
reference EIS
established ElS evaluated on the basis of either a known service experience record or aknown comparative functional evaluation
3.5
EIS assessed thermal endurance indexEIS ATE
numerical value of temperature in degrees Celsius for the reference ElS as derived fromknown service experience or a known comparative functional evaluation
3.6
EIS relative thermal endurance indexEIS RTE
numerical value of the temperature in degrees Celsius of the candidate EIS which is relativeto the known EIS ATE of a reference EIS, when both EIS are subjected to the same ageingand diagnostic procedures in a comparative test
4 General considerations
This standard provides relatively low cost and short-time methods by which the user canmake modifications to an established EIs by evaluating
a) the impact on the thermal life of the EIS if the thickness of an ElM is changed,b) the compatibility,under thermal stress, of a substituted EIM,
c) the compatibility,under thermal stress, of other components used in intimate contact with
an established Els.
EIM having different temperature indices (ATE/RTE) according to lEC 60216-5, may becombined to form an EIS having a thermal class that may be higher or lower than that of anyof the individual components according to lEC 60505.
There may be more than one Els in a particular apparatus.These ElS may have differentthermal classes.
The following overview(Figure 1) is a flow chart for guidance in selecting the proper clausesfor evaluation.