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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces TB/T 3036-2002 Section separation insulator for overhead contact system of 25 kV electrified railway. The following main technical changes have been made with respect to TB/T 3036-2002:
——The terms and definitions are added (see Clause 3);
——The representation of product model is modified (see Clause 4 of this standard; and Clause 4 of Edition 2002);
——The contents of working conditions are supplemented, revised and added (see Clause 5 of this standard; and Clause 5 of Edition 2002);
——The corresponding maximum working load, maximum tensile failure load and routine tensile load of the section insulators (see 6.2.1 of this standard);
——The creepage distance is modified (see 6.2.2 of this standard; and 6.2.2 of Edition 2002);
——The requirements are added for bar-shaped composite insulators used for section insulators but not in direct contact with pantograph (see 6.3.1 of this standard);
——Modifications are made to the requirements for tensile failure load (see 6.3.2.1 of this standard; and 6.3.1 of Edition 2002);
——Modifications are made to the dry power frequency withstand voltage, wet power frequency withstand voltage and lightning impulse withstand voltage of contact insulating parts, and water diffusion test items are added (see 6.3.2.2 of this standard; and 6.3.2 of Edition 2002);
——The test method is added (see Clause 7 of this standard);
——The inspection rules are modified (see Clause 8 of this standard; and Clause 9 of Edition 2002 ).
This part was proposed by and is under the jurisdiction of China Railway Electrification Engineering Group Co., Ltd.
The previous edition of the standard replaced by this standard is as follows: TB/T 3036-2002.
Section insulators for catenary of electrified railways
1 Scope
This standard specifies the terms and definitions, product classification and designation, working conditions, technical requirements, inspection methods, inspection rules, marks and packaging of section insulator products for catenary of electrified railways.
This standard is applicable to the section insulators at the in-phase electric disconnection of the catenary of single-phase AC electrified railways with a nominal voltage of 25 kV.
2 Normative references
The following referenced documents are indispensable for the application of this standard. For dated references, only the edition cited applies. For undated reference, the latest edition of the referenced document (including any amendments) applies.
GB/T 1411-2002 Dry, solid insulating materials - Resistance test to high-voltage, low-current arc discharges (IEC 61621:1997, IDT)
GB/T 2900.8-2009 Electrotechnical terminology - Insulators (IEC 60050-471: 2007, IDT)
GB/T 4585-2004 Artificial pollution tests on high-voltage insulators to be used on a.c systems (IEC 60507: 1991, IDT)
GB/T 6553-2003 Test methods for evaluating resistance to tracking and erosion of electrical insulating materials used under severe ambient conditions (IEC 60587:1984, IDT)
GB/T 16927.1-2011 High-voltage test techniques - Part 1: General definitions and test requirements (IEC 60060-1:2006, MOD)
GB/T 20142-2006 Composite line post insulators for A.C. overhead lines with a nominal voltage greater than 1000 V - Definitions, test methods and acceptance criteria
TB/T 2073-2010 General technical specification of fittings for overhead contact system in electrification railway
TB/T 2074-2010 Test methods of fittings for overhead contact system in electrification railway
TB/T 2075.9-2010 Fittings for overhead contact system in electrification railway - Part 9: Connection clamp
TB/T 3199.2-2008 Insulators for overhead contact system of electrified railways - Part 2: Log rod composite insulators
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 2900.8 and the following apply.
3.1
section insulator
insulation equipment for catenary, a member with insulating parts, diversion parts, and fittings inserted into the contact suspension; capable of realizing electric disconnection between in-phase adjacent two sections of contact suspension and allowing the pantograph to pass through and take current uninterruptedly
3.2
conductive runner
part of the section insulator used for diversion
3.3
insulating part
part of the section insulator used for insulation
3.4
section insulator with insulating runner
section insulator with which the pantograph of electric locomotive is in direct contact when the main insulation part is in operation
3.5
section insulator with non insulating runner
section insulator with which the pantograph of electric locomotive is not in direct contact when the main insulation part is in operation
3.6
arc horns
structure consisting of a pair of metal members, with a certain space distance and the ability of arc strike
4 Product classification and designation
4.1 Product classification
Section insulators may be divided into the following types by structural type of the insulation:
a) Section insulator with insulating runner;
b) Section insulator with non insulating runner.
Section insulators may be divided into type A and type B according to the maximum working load.
4.2 Representation of product model
The section insulator shall be represented in the way shown below according to arc strike type, slideway type, insulation material type, creepage distance and applicable wire type.
Example: FYHH-1.6AT indicates that the section insulator is arc-striking, with its insulating part used as slideway and made of composite materials, with creepage distance of 1.6m, and it is Model A and is applicable to copper or copper alloy contact wires.
4.3 Product mark
The product mark is composed of the manufacturer’s mark and the product model specified in this standard.
5 Working conditions
5.1 Nominal voltage: AC 25 kV.
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5.2 Altitude: ≤1,400m.
For section insulators used in circumstances with an altitude higher than 1,400 m but no more than 4,000m, the test voltage shall be the rated withstand voltage specified in this standard multiplied by the altitude correction factor Ka, as shown in Formula (1).
(1)
where:
H——the altitude of the installation site.
5.3 Ambient temperature: -40℃~40℃.
5.4 Adaptive running speed: ≤ 120 km/h.
5.5 This standard is applicable to products used under normal environmental conditions. Products used under special environmental conditions shall be designed and used according to the agreement between the manufacturer and the user.
6 Technical requirements
6.1 Basic requirements
The section insulator shall be manufactured according to the drawings and technical documents approved by this standard and prescribed procedures. The body of section insulator shall be made of light alloy materials with high-strength mechanical properties, high-strength polymeric materials, and corrosion-resistant and wear-resistant materials.
6.2 Electromechanical properties of section insulators
6.2.1 Mechanical properties
The mechanical properties shall meet the following requirements:
a) Maximum working load, Model A: 16.5 kN; Model B: 31.5 kN.
b) Tensile failure load, Model A: ≥ 49.5 kN; Model B: ≥94.5 kN.
c) Routine tensile test load, Model A: ≥ 24.8 kN; Model B: ≥47.3 kN.
d) Initial sliding force: ≥ 95% of the comprehensive breaking force of the contact wires it is connected with.
e) Vibration test: Apply the maximum working load to the section insulator, with vibration frequency of 2×106 times, amplitude of 35 mm; and frequency of 1 Hz~3 Hz. After the vibration test, the initial sliding force shall decrease by no more than 10%. Each component of the section insulator shall be free from cracks, sliding, deformation and damage.
f) Axial fatigue test: After vibration test, apply alternating loads of the maximum working load (static load) and ± 30% maximum working load (dynamic load) to the section insulator, with frequency of 1 Hz~3 Hz. After 5×105 axial fatigue tests (waveform: sine wave), the tensile failure load shall decrease by no more than 5%. Each component of the section insulator shall be free from cracks, sliding, deformation and damage.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Product classification and designation
5 Working conditions
6 Technical requirements
7 Inspection methods
8 Inspection rules
9 Marking and packaging
