DL/T 627-2012Room temperature vulcanized silicon rubber anti-pollution coating for insulators (English PDF)

Foreword

This 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 insulators

1 Scope

This 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 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.

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 V

3 Terms and definitions

For 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.

4 Basic technical requirements