DL/T 627-2012 English PDF (DLT627-2012)

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DL/T 627-2012: Room temperature vulcanized silicon rubber anti-pollution coating for insulators
DL/T 627-2012
GB
ELECTRIC POWER INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
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
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Table of Contents
Foreword ... 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 ... 25 
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.
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 surface
4 Basic technical requirements
4.1 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 ...