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DL/T 627-2012: Room temperature vulcanized silicon rubber anti-pollution coating for insulators Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Obsolete DL/T 627: Historical versions
Similar standardsDL/T 627-2012: Room temperature vulcanized silicon rubber anti-pollution coating for insulators---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/DLT627-2012GB ELECTRIC POWER INDUSTRY STANDARD ICS 29.080.10 K 48 Reference No.. 36391-2012 Replacing DL/T 627-2004 Room temperature vulcanized silicon rubber anti-pollution coating for insulators Issued on: APRIL 6, 2012 Implemented on: JULY 1, 2012 Issued by. National Energy Administration 3.No action is required - Full-copy of this standard will be automatically & immediately delivered to your EMAIL address in 0~60 minutes. Table of ContentsForeword... 3 1 Scope... 4 2 Normative references... 4 3 Terms and definitions... 6 4 Basic technical requirements... 6 5 Inspection rules... 9 6 Packaging and storage... 10 7 Selection principle... 11 8 Acceptance... 11 9 Construction... 12 10 Operation maintenance... 12 11 Technical management... 15 Annex A (Normative) Test method for shear strength... 16 Annex B (Normative) Self-cleaning test method... 19 Annex C (Normative) Test method for impact breakdown voltage... 22 Annex D (Normative) Aging test under operating voltage and simulated climate... 24 Annex E (Normative) RTV coating thickness measured by slice method... 25ForewordThis Standard replaces DL/T 627-2004 Room temperature vulcanized silicon rubber anti-pollution coating for insulators. Compared with DL/T 627-2004, the main differences in this Standard are as follows. - modified the “Terms”, “Basic technical requirements”, “Inspection rules” and “Operation maintenance” in DL/T 627-2004; - added “Overhaul” and “Technical management”. This Standard was proposed by China Electricity Council. This Standard shall be under the jurisdiction of National Technical Committee on Power Industry Insulators of Standardization Administration of China. Main revising organization of this Standard. State Grid Electric Power Research Institute. The drafting organizations of this Standard. State Grid Corporation, Hebei Electric Power Research Institute, Hebei Silicon Valley Chemical Co., Ltd., East China Electric Power Design Institute. Main drafters of this Standard. Wu Guangya, Ye Tinglu, Gao Jun, Zhang Yue, Zhang Qin, Zhang Zhigang, Song Furu, Huang Weizhong, Jia Boyan. Send any opinions or suggestions during the implementation of this Standard to China Electric Power Enterprise Federation Standardization Management Center (address. No. 1, 2nd Lane, Baiguang Road, Beijing, 100761) Room temperature vulcanized silicon rubber anti-pollution coating for insulators1 ScopeThis Standard specifies the basic technical requirements, inspection rules, packaging and storage, selection principle, acceptance, construction, operation maintenance and technical management of room temperature vulcanized silicon rubber anti-pollution coating for insulators (referred to as RTV). This Standard is applicable to RTV coating used for insulators that are operating under the pollution conditions that AC system rated voltage is higher than 1000 V, ambient temperature is at -40°C ~ +40°C. This Standard shall be used for DC system as reference.2 Normative referencesThe 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. GB/T 529-2008, Rubber vulcanized or thermoplastic - Determination of tear strength (Trouser, angle and crescent test pieces) GB/T 775.1-2006, Test method for insulators - Part 1.General test methods GB/T 775.2-2003, Test method for insulators - Part 2.Electrical test methods GB/T 1408.1-2006, Electrical strength of insulating materials - Test methods - Part 1.Tests at power frequencies GB/T 1409-2006, Recommended methods for the determination of the permittivity and dielectric dissipation factor of electrical insulating materials at power, audio and radio frequencies including meter wavelengths GB/T 1692-2008, Vulcanized rubber - Determination of the insulation resistivity GB/T 1720-1979, Method of test for adhesion of paint films GB/T 1723-1993, Determination of viscosity of coatings GB/T 1725-2007, Paints varnishes and plastics - Determination of non-volatile-matter content GB/T 1768-2006, Method of test for abrasion resistance of paint films GB/T 2900.5, Electrotechnical terminology - Insulating solids, liquids and gases GB/T 2900.8, Electrotechnical terminology - Insulators GB/T 2900.19, Electrotechnical terminology - High-voltage test technique and insulation co-ordination GB/T 6553-2003, Test methods for evaluating resistance to tracking and erosion of electrical insulating materials used under severe ambient conditions GB/T 6753.2, Paints and varnishes - Surface-drying test - Ballotini method GB/T 9274-1988, Paints and varnishes; Determination of resistance to liquids GB/T 10707-2008, Rubber - Determination of the burning GB/T 13936, Rubber, vulcanized - Method for determination of strength properties of adhesive to metal in shear by tension loading GB/T 16927.1, High-voltage test techniques - Part 1.General definitions and test requirements GB/T 16927.2, High-voltage test techniques - Part 2.Measuring systems GB/T 19519, Insulators for overhead lines - Composite suspension and tension insulators for a.c. systems with a nominal voltage greater than 1000 V - Definitions, test methods and acceptance criteria GB/T 20642, Impulse puncture test in air on insulators for overhead lines DL/T 859, Artificial Pollution Tests on Composite Insulators Used on High-voltage AC Systems DL/T 864, Application guide of composite insulators for AC overhand lines with a nominal voltage over 1000 V3 Terms and definitionsFor the purposes of this document, the terms and definitions defined in GB/T 2900.5, GB/T 2900.8 and GB/T 2900.19 as well as the follows apply. 3.1 anti-pollution coating A layer of room temperature curing silicone rubber coating on the insulating surface of the insulator under the condition of pollution, referred to as RTV anti-pollution coating. This Standard divides RTV coating products into ordinary RTV-I type and enhanced RTV-II type. 3.2 RTV coating a thin film of a layer of room temperature cured silicone rubber coated on the insulating surface of the insulator is called a coating 3.3 Self-cleaning the ability of RTV coating inhibiting the adhesion of dirt to its surface4 Basic technical requirements4.1 Coating 4.1.1 Appearance A viscous liquid of color uniformity, no obvious mechanical impurities and floc. 4.1.2 Solid content The solid content is not less than 50%. 4.1.3 Viscosity At 25°C, the viscosity of the coating is not less than 80s (coated with -4 viscometer). 4.1.4 Hydrophobicity The hydrophobicity shall meet requirements of Annex A in DL/T 864. 4.1.5 Insulation performance The insulation performance shall meet the following. a) the volume resistivity is not less than 1.0×1012 Ω•m; Respectively soak in the 25°C acid, alkali, salt reagent (concentration of 3%) 24h, there shall be no shedding, wrinkling, blistering, discoloration or other phenomena. 4.1.9.2 Oil resistance Soaking in the 100°C transformer oil 24h, there shall be no shedding, wrinkling, blistering, discoloration, etc. 4.2 RTV coating 4.2.1 Appearance RTV coating is flat, smooth and free of bubbles. 4.2.2 Pollution pressure performance For reference disc-type suspension insulators (e.g. U160B), according to the test method specified in DL/T 859, when the salinity (SES) is 20 kg/m3 and above, or the test salt density (SDD) is 0.1 mg/cm2 and the gray density (NSDD) is 0.5 mg/cm2, after the hydrophobicity of polluted layer surface is removed, under the same test conditions, the insulator pollution voltage with RTV coating U1, comparing to the the insulator pollution voltage with RTV coating U2, shall not be less than 2.0 when using solid layer method, not less than 1.5 when using salt spray method. 4.2.3 Impact breakdown performance The impact breakdown performance of disc-type suspension porcelain (glass) insulator that uses RTV-II type with 160 kN and above shall comply with the provisions of GB/T 20642.See Annex C for its test method and determination rules. 4.2.4 5000h artificial accelerated aging test The 5000h artificial accelerated aging test shall be carried out by both parties based on negotiation. See Annex D for 5000h artificial accelerated aging test method. 4.2.5 C... ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. |
