IEC TR 62039:2021 pdf download – Selection guidelines for polymeric materials for outdoor use under HV stress.
2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements 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 60243-1 , Electric strength of insulating materials – Test methods – Part 1: Tests at power frequencies IEC 60243-2, Electric strength of insulating materials – Test methods – Part 2: Additional requirements for tests using direct voltage IEC 60455-2, Resin based reactive compounds used for electrical insulation – Part 2: Methods of test IEC 60587, Electrical insulating materials used under severe ambient conditions – Test methods for evaluating resistance to tracking and erosion IEC 60695-1 1 -1 0, Fire hazard testing – Part 11-10: Test flames – 50 W horizontal and vertical flame test methods IEC 61 621 , Dry, solid insulating materials – Resistance test to high-voltage, low-current arc discharges IEC TS 62073, Guidance on the measurement of hydrophobicity of insulator surfaces
IEC 62631 -3-1 , Dielectric and resistive properties of solid insulating materials – Part 3-1: Determination of resistive properties (DC methods) – Volume resistance and volume resistivity – General method ISO 34-1 , Rubber, vulcanized or thermoplastic – Determination of tear strength – Part 1: Trouser, angle and crescent test pieces ISO 483, Plastics – Small enclosures for conditioning and testing using aqueous solutions to maintain the humidity at a constant value ISO 4892-2, Plastics – Methods of exposure to laboratory light sources – Part 2: Xenon-arc lamps ISO 6721 -1 1 , Plastics – Determination of dynamic mechanical properties – Part 11: Glass transition temperature ISO 1 1 357-2, Plastics Differential scanning calorimetry (DSC) Part 2: Determination of glass transition temperature and step height ISO 1 1 359-2, Plastics – Thermomechanical analysis (TMA) – Part 2: Determination of coefficient of linear thermal expansion and glass transition temperature 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: • IEC Electropedia: available at http://www.electropedia.org/ • ISO Online browsing platform: available at http://www.iso.org/obp
3.1 hydrophobicity surface of a solid insulating material characterized by its capacity to repel water or aqueous electrolyte solutions Note 1 to entry: Hydrophobicity of a polymeric insulating material is, in general, a volume property by means of the chemical composition of a material at its surface. Note 2 to entry: Nonetheless, hydrophobicity is strongly affected by surface effects such as: • surface structure (i.e. roughness); • chemical interaction between water and the solid surface (adsorption, absorption, swelling of the solid material in contact with water); • an accumulated pollution layer. Note 3 to entry: Furthermore, the conditions during an evaluation of hydrophobicity (climatic (temperature, pressure, humidity), and the method for cleaning or electrostatic charges can affect the measured degree of hydrophobicity. 3.2 hydrophobicity class HC specific level of the scale used in the spray method (Method C) Note 1 to entry: Seven classes, HC1 to HC7, have been defined. HC1 corresponds to the most hydrophobic surface and HC7 to the most hydrophilic surface. [SOURCE: IEC TS 62073:201 6, 2.6]
3.3 hydrophobicity transfer phenomenon of a transfer of hydrophobicity from the bulk of the housing material onto the pollution layer on its surface [SOURCE: CIGRE TB 442:201 0, Clause 4] 3.4 hydrophobicity transfer material HTM polymeric material which exhibits hydrophobicity and the capability to transfer hydrophobicity onto the layer of pollution, which is a combined dynamic behaviour of retention and transfer of hydrophobicity specific to different insulator materials [SOURCE: IEC TS 6081 5-4:201 6, 3.1 .4. modified – The text after “pollution” has been added and the Note to entry has been deleted.] 4 Important material properties 4.1 General This document defines the important properties that need to be tested on the material itself in order to ensure the functioning of the material under normal operating service conditions. Physical, mechanical, electrical and chemical properties of the materials have been considered. According to their function in the insulation, three categories of insulating materials are considered: • housing materials (in general a silicone rubber, EPDM, EVA, etc.); • core materials (FRP, etc.); • structural materials (epoxy, etc.). The minimum requirements are, as far as possible, based on the performance of polymeric insulators in service.