This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces TB/T 3077.1-2006 Post insulators on the roof of electric locomotives - Part 1: Ceramic insulators and TB/T 3077.2-2006 Post insulators on the roof of electric locomotives - Part 2: Composite insulators.
The following main technical changes have been made with respect to TB/T 3077.1-2006 and TB/T 3077.2-2006:
——the clause “Terms and definitions” is added (see Clause 3);
——the rated voltage is changed from 29kV to 27.5kV (see 4.2; 3.2 of Edition 2006);
——the requirements for altitude in operating environment are modified (see Clause 5; 4.2 of Edition 2006);
——the general technical requirements for insulators are modified (see 6.1; 4.1 of Edition 2006);
——the appearance requirements for polymeric insulator are modified (see 6.2; 4.4.2 and 4.4.3 of TB/T 3077.2-2006);
——the appearance requirements for ceramic insulator are added (see 6.2);
——the main structural dimension requirements are modified (see 6.3; 4.3 of Edition 2006);
——the relevant contents of insulators with a structure height of 315mm are deleted (see 4.3 and 4.4 of Edition 2006);
——the electrical performance requirements for insulators are modified, and the flashover voltage value test provided by the manufacturer for not less than five times is added to the voltage value test of artificial pollution test (see Table 1; Table 1 of Edition 2006);
——the mechanical performance requirements for insulators are modified (see Table 2; Table 2 of Edition 2006);
——the clause “Test” is modified (see Clause 7; Clause 5 of TB/T 3077.1-2006 and Clause 6 of TB/T 3077.2-2006);
——the clause “Marking, packaging, transportation and storage” is modified (see Clause 8; Clause 6 of TB/T 3077.1-2006 and Clause 7 of TB/T 3077.2-2006).
This standard is under the jurisdiction of CRRC Zhuzhou Institute Co., Ltd.
Drafting organizations of this standard: CARS Locomotive & Car Research Institute, CRRC Zhuzhou Institute Co., Ltd., CRRC Tangshan Co., Ltd., CRRC Changchun Railway Vehicles Co., Ltd., CRRC Zhuzhou Institute Co., Ltd. and CNR Datong Electric Locomotive Co., Ltd.
Drafters of this standard: Guo Chenxi, Yang Sile, Wang Jin, Liu Jinzhu, He Chaobao, Zhao Zhiqiang, Ma Ming, Liao Xiangping and Jin Lei.
The previous editions of this standard are as follows:
——TB/T 3077-2003;
——TB/T 3077.1-2006, TB/T 3077.2-2006.
Post insulators on board of rolling stock
1 Scope
This standard specifies the classification and model, environmental conditions, technical requirements, test, as well as marking, packaging and storage of post insulators on board of rolling stock.
This standard is applicable to the outdoor post insulators for supporting pantograph and busbar of electric rolling stock and EMUs with an AC traction system of nominal voltage of 25kV (hereinafter referred to as insulators). This standard may serve as a reference for other types of roof insulators.
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 311.1 Insulation co-ordination - Part 1: Definitions, principles and rules (GB/T 311.1-2012, IEC 60071-1:2006, MOD)
GB/T 2900.8 Electrotechnical terminology - Insulators (GB/T 2900.8-2009, IEC 60050-471:2007, IDT)
GB/T 4585 Artificial pollution tests on high-voltage insulators to be used on a.c. systems (GB/T 4585-2004, IEC 60507:1991, IDT)
GB/T 6553 Electrical insulating materials used under severe ambient conditions - Test methods for evaluating resistance to tracking and erosion (GB/T 6553-2014, IEC 60587:2007, IDT)
GB/T 8287.1 Indoor and outdoor post insulators for systems with nominal voltage greater than 1000 V - Part 1: Test on insulators of ceramic material or glass (GB/T 8287.1-2008, IEC 60168:2001, MOD)
GB/T 8287.2 Indoor and outdoor post insulators for systems with nominal voltage greater than 1000 V - Part 2: Dimensions and characteristics (GB/T 8287.2-2008, IEC 60273:1990, MOD)
GB/T 20142 Composite line post insulators for a.c. overhead lines with a nominal voltage greater than 1000V - Definitions, Test methods and acceptance criteria (GB/T 20142-2006, IEC 61592:2002, MOD)
GB/T 22079 Polymeric insulators for indoor and outdoor use with a nominal voltage >1 000 V - General definitions test methods and acceptance criteria (GB/T 22079-2008, IEC 62217:2005, MOD)
DL/T 376 General technical requirements of silicone rubber insulation materials for composite insulators
DL/T 859 Artificial pollution tests on composite insulators used on high-voltage AC systems
JB/T 8177 The hot dip galvanized coating of metallic parts for insulators general technical specification
JB/T 9673 Packet of insulators
TB/T 2007-2015 Guide to the selection of insulators for overhead contact system of electrified railways
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 2900.8, GB/T 8287.1, GB/T 8287.2, GB/T 20142, GB/T 22079 and the following apply. For the convenience of application, some terms and definitions given in GB/T 20142-2006 and GB/T 22079-2008 are listed repeatedly as follows.
3.1
polymeric insulator
insulator with insulating part made of at least one organic material
Note 1: Connectors may be installed at both ends of insulating part.
Note 2: Polymeric insulators may also be called non-ceramic insulators.
[GB/T 22079-2008, definition 3.1]
3.2
resin insulator
polymeric insulator which is made of only one housing-based organic material and is composed of a solid rod and a shed protruding from the rod body (e.g., epoxy resin)
[GB/T 22079-2008, definition 3.2]
3.3
composite insulator
insulator made of at least two insulation components, namely core and housing, and equipped with end assembly
Note: Composite insulators may be made in such a way as putting multiple single housings on the core (with or without intermediate sheath), or directly molding or casting the housings on the core once or several times.
[GB/T 22079-2008, definition 3.3]
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3.4
creepage distance
minimum distance or the sum of the minimum distances along the surface between the conductive components of the insulator which is under normal operation at operating voltage
Note 1: The surface of cement or other non-insulated glued materials cannot be included into the creepage distance.
Note 2: If a high resistance layer is applied to the insulating part of insulator, the insulating part is regarded as an effective insulating surface, and its surface distance is included in the creepage distance.
[GB/T 22079-2008, definition 3.8]
3.5
SCL; specified cantilever load
cantilever load applied on the line end accessories under which the insulator is able to withstand under specified test conditions, with its value specified by the insulator manufacturer
[GB/T 20142-2006, definition 3.14]
3.6
MDCL; maximum design cantilever load
cantilever load at which the core rod will be damaged, which shall not be less than the operating load, and its value and load applying direction shall be specified by the insulator manufacturer
[GB/T 20142-2006, definition 3.15]
3.7
STL; specified tensile load
tensile load under which the insulator is able to withstand under specified test conditions, with its value specified by the insulator manufacturer
[GB/T 20142-2006, definition 3.16]
4 Classification and model
4.1 Classification
Insulators are classified into insulators for pantograph support and insulators for busbar (conductive rod) support according to installation methods.
4.2 Insulator model representation method
Example 1: CS 400A-27.5/8 represents a ceramic insulator for pantograph support of rolling stock, with a structural height of 400mm, product series of A series, rated voltage of 27.5kV and specified cantilever load of 8kN.
Example 2: FS 400A-27.5/16 represents a composite insulator for pantograph support of rolling stock, with a structural height of 400mm, product series of A series, rated voltage of 27.5kV and specified cantilever load of 16kN.
5 Environmental conditions
The insulator shall be able to operate normally under the following environmental conditions:
a) the altitude does not exceed 1,500m;
b) the ambient temperature is -40℃~40℃;
c) it shall be able to withstand the invasion of rain (condensation), snow (frost), fog, wind, sand and other pollutions under normal meteorological conditions during operation;
d) in heavily polluted areas and the following areas specified in TB/T 2007-2015.
When the altitude is greater than 1,500m or the ambient temperature is higher than 40℃, the external insulation characteristics of insulators shall be corrected according to the requirements of GB/T 311.1.
6 Technical requirements
6.1 General
In addition to the technical requirements of this standard, other performances of ceramic insulators shall comply with GB/T 8287.1 and GB/T 8287.2, and polymeric insulators shall comply with GB/T 22079 and GB/T 20142.
The silicone rubber insulating material used for composite insulators shall comply with DL/T 376.
The shed of composite insulator shall ensure that it will not be torn during operation.
The hot dip galvanizing coating of ferrous metal accessories shall comply with JB/T 8177. If stainless steel is used, low-temperature-resistant materials shall be used.
6.2 Appearance requirements
The area of single defect (such as lack of degumming, bulge, etc.) on the surface of polymeric insulator housing is not greater than 15mm2, the depth is not greater than 1mm, and the number of defects on a single housing is not greater than 3. The raised surface and joint shall be cleaned and leveled, and the pinhole depth or raised height is not greater than 0.8mm. The total area of defects is not greater than150mm2.
The area of single defect on the surface glaze of ceramic insulator is not greater than 15mm2, and the number of defects is not greater than 3. The pinhole depth or raised height is not greater than 0.8mm, and the number is not greater than 5.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Classification and model
5 Environmental conditions
6 Technical requirements
7 Tests
8 Marking, packaging and storage
