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TB/T 1484 consists of the following parts under the general title Specification for Cables on Board Rolling Stock:
——Part 1: Power and Control Cables;
——Part 2: 30 kV Single Phase Power Cables;
——Part 3: Communication Cables.
This part is Part 2 of TB/T 1484.
This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This part replaces TB/T 1484.3-2010 Specification for Cables on Board Rolling Stock—Part 3: 30 kV Single Phase Power Cables. This part mainly has made the technical changes from TB/T 1484.3-2010 as follows:
——The terms and definitions of extruded insulation, conductor screen and insulation screen are deleted (3.2, 3.3 and 3.4 of Edition 2010);
——The constructional dimensions of cable are modified, including nominal conductor sections of 185 mm2 and 240 mm2 are added, the conductor diameters, nominal thicknesses of insulation, insulation diameters, nominal thicknesses of sheath and outside diameters of cable of the specifications are modified, and the item of conductor construction is deleted (Table 1 hereof; Table 1 of Edition 2010);
——The code compositions and meanings are modified (4.2 of Annex A hereof; 4.2 of Edition 2010);
——Environmental conditions are added (5.1 hereof);
——A maximum long-term working voltage is added (5.2.4 hereof);
——The requirement that the semi-conductive tape and insulating material of conductor screen extrusion shall be cross linked is added (6.2.1 and 6.3.1 hereof).
——The requirement for insulation concentricity is added (6.3.2 hereof);
——The requirement for the minimum section area of metallic screen is modified, i.e. where the conductor section is 150 mm2 or larger, the minimum section area of metal shielding layer is changed from 20mm2 to 25mm2 (6.4.3 hereof; 5.5.3 of Edition 2010);
——Isolation material and the requirement that is shall be readily removable are added (6.5 hereof);
——The requirement for sheath appearance inspection is added (6.6.3 hereof);
——The requirement for cable ovality is added (6.6.4 hereof);
——The ozone resistance requirements are modified (7.2.3 hereof; Table 4 of Edition 2010);
——The oil immersion duration for oil resistance test is modified (7.2.4 hereof; Table 5 of Edition 2010);
——The maximum permanent elongation of sheath after thermal elongation test is modified (Table 5 hereof; Table 5 of Edition 2010);
——The requirement and method for acid and alkaline resistance tests are added (7.2.7 and 8.4.8 hereof);
——The requirement and method for weatherability test are added (7.2.11 and 8.4.12 hereof);
——The requirement and test method for insulation voltage withstand performance are modified (7.3.2 and 8.5.4 hereof; 7.4.7.2 of Edition 2010);
——The requirement and method for power-frequency spark test of cable sheath are added (7.3.11 and 8.5.13 hereof);
——The requirements and methods for halogen content and toxicity index tests are added (7.4.4, 7.4.5 and 8.6.4 ~ 8.6.6 hereof);
——The method for section area test of metallic screen is added (8.3.1);
——The test methods for outside diameter of cable, ovality (f value), conductor lay ratio and insulation concentricity are added (8.3.3 ~ 8.3.5 hereof);
——Sequence of cable electrical performance test and special clauses are added (8.5.1 and 8.5.2 hereof);
——The computing formula for cylinder diameter used in bending test is modified (8.5.6 hereof; 7.4.4.1 of Edition 2010).
This standard was proposed by and is under the jurisdiction of CRRC Zhuzhou Electric Locomotive Research Institute Co., Ltd.
The previous editions of the standard replaced by this part are as:
——TB/T 1484-1983;
——TB/T 1484.2-2001;
——TB/T 1484.3-2010.
Specification for Cables on Board Rolling Stock—Part 2: 30 kV Single Phase Power Cables
1 Scope
This part of TB/T 1484 specifies construction and code, service conditions, technical requirements, inspection methods and rules, marking, packaging, transportation and storage of 30 kV single phase power cables for rolling stocks.
This part is applicable to 30 kV single phase power cables for rolling stocks (including EMUs).
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 2900.10-2013 Electrotechnical Vocabulary—Electric Cables (IEC 60050-461:2008, IDT)
GB/T 2951.11 Common Test Methods for Insulating and Sheathing Materials of Electric and Optical Cables—Part 11: Methods for General Application—Measurement of Thickness and Overall Dimensions—Tests for Determining the Mechanical Properties (GB/T 2951.11-2008, IEC 60811-1-1:2001,IDT)
GB/T 2951.12-2008 Common Test Methods for Insulating and Sheathing Materials of Electric and Optical Cables—Part 12: Methods for General Application—Thermal Aging Methods (IEE 60811-1-2:1985, IDT)
GB/T 2951.13 Common Test Methods for Insulating and Sheathing Materials of Electric and Optical Cables—Part 13: Methods for General Application—Measurement for Determining the Density—Water Absorption Tests—Shrinkage Test (GB/T 2951.13-2008, IEC 60811-1-3:2001,IDT)
GB/T 2951.14 Common Test Methods for Insulating and Sheathing Materials of Electric and Optical Cables—Part14: Methods for General Application—Test at Low Temperature (GB/T 2951.14-2008, IEC 60811-1-4:1985,IDT)
GB/T 2951.21 Common Test Methods for Insulating and Sheathing Materials of Electric and Optical Cables—Part 21: Methods Specific to Elastomeric Compounds—Ozone Resistance, Hot Set and Mineral Oil Immersion Tests (GB/T 2951.21-2008, IEC 60811-2-1:2001,IDT)
GB/T 3048.4 Test Methods for Electrical Properties of Electric Cables and Wires—Part 4: Test of DC Resistance of Conductors
GB/T 3048.8 Test Methods for Electrical Properties of Electric Cables and Wires—Part 8:AC Voltage Test (GB/T 3048.8-2007, IEC 60060-1:1989, NEQ)
GB/T 3048.11 Test Methods for Electrical Properties of Electric Cables and Wires - Part 11: Test for Dielectric Dissipation Factor
GB/T 3048.12 Test Methods for Electrical Properties of Electric Cables and Wires—Part 12: Partial Discharge Test (GB/T 3048.12-2007,IEC 60885-3:1988,MOD)
GB/T 3048.13-2007 Test Methods for Electrical Properties of Electric Cables and Wires—Part 13: Impulse Voltage Test (IEC 60230:1966,IEC 60060-1:1989,MOD)
CB/T 3956-2008 Conductors of Insulated Cables (IEC 60228:2004,IDT)
GB/T 4909.2 Test Methods for Bare Wires—Part 2: Measurement of Dimensions
GB/T 5441-2016 Test Methods for Communication Cable
GB/T 6995.1-2008 Markings for Electric Wires and Cables—Part 1: General Requirements
GB/T 6995.3 Markings for Electric Cables and Wires—Part 3: Identifications of Cables and Wires
GB/T 7113.2 Flexible Insulating Sleeving—Part 2: Methods of Test (GB/T 7113.2-2014, IEC 60684-2:2003,MOD)
GB/T 12706.3-2008 Power Cables with Extruded Insulation and Their Accessories for Rated Voltages from 1kV (Um=1.2kV) up to 35kV (Um=40.5kV)—Part 3: Cables for Rated Voltage of 35kV (Um=40.5kV)(IEC 60502-2:2005.NEQ)
GB/T 14049-2008 Aerial Insulated Cables for Rated Voltage of 10kV
GB/T 16927.1 High-voltage Test Techniques—Part 1: General Definitions and Test Requirements (GB/T 16927.1-2011,IEC 60060-1:2006.MOD)
GB/T 17650.1 Test on Gases Evolved during Combustion of Materials from Cables—Part 1: Determination of the Halogen Acid Gas Content (GB/T 17650.1-1998,idt IEC 60754-1:1994)
GB/T 17650.2 Test on Gases Evolved during Combustion of Materials from Cables—Part 2: Determination of Degree of Acidity of Gases by Measuring pH and Conductivity (GB/T 17650.2-1998,idt IEC 60754-2:1991)
GB/T 17651.2 Measurement of Smoke Density of Cables Burning under Defined Conditions—Part 2: Test Procedure and Requirements (GB/T 17651.2-1998, idt IEC 61034-2:1997)
GB/T 18380.12 Tests on Electric Cables under Fire Conditions—Part 12: Test for Vertical Flame Propagation for a Single Insulated Wire or Cable—Procedure for 1kW Pre-mixed Flame (GB/T 18380.12-2008, IEC 60332-1-2:2004,IDT)
GB/T 28427-2012 27.5kV Single-phase AC XLPE Insulation Cable and Accessories for Electrification Railway
TB/T 1484.1-2017 Cables on Board Rolling Stock—Part 1: Power and Control Cable
3 Terms and definitions
For the purpose of this document, terms and definitions established in GB/T 2900.10-2013 and the followings apply.
3.1
rated voltage
U0
the reference voltage for cable construction design and electrical performance test, which, generally is the RMS voltage of an insulated conductor to the ground (mental sheath or ambient medium of cable)
Note: rated voltage is expressed in kilovolts.
4 Cable Construction and Code
4.1 Cable Construction Types and Dimensions
4.1.1 A cable is composed of conductor, extruded semi-conductive conductor screen, insulation, extruded semi-conductive insulation screen, wrapped semi-conductive insulation screen, metallic screen, isolation tape, sheath, etc. See Figure 1.
Key:
a——conductor;
b——extruded semi-conductive conductor screen;
c——insulation;
d——extruded semi-conductive insulation screen;
e——wrapped semi-conductive insulation screen;
f——metallic screen;
g——isolation tape;
h——sheath.
Figure 1 Cable Construction
4.1.2 Cable construction dimensions shall be in accordance with those specified in Table 1.
Table 1 Cable Construction Dimensions
Item Unit Dimension
Nominal section mm2 70 95 120 150 185 240
Nominal diameter of conductor mm 11.5 13.5 15.5 17.0 18.5 21.5
DC resistance of conductor at 20℃ (maximum) Ω/km 0.277 0.210 0.164 0.132 0.108 0.0817
Nominal thickness of insulation a mm 8.0 8.0 8.0 8.0 8.0 8.0
Insulation diameter b mm 29.7±1.1 31.7±1.1 33.7±1.2 35.2±1.2 36.7±1.3 39.7±1.3
Nominal thickness of sheath mm 3.5 3.5 3.5 3.5 3.5 3.5
Outside diameter of cable mm 41.9±2.4 43.9±2.4 45.9±2.5 47.4±2.5 48.9±2.6 51.9±2.6
a With the use requirements being met, the insulation thickness may be appropriately increased and the maximum nominal thickness of insulation is recommended to be 12 mm; relevant dimensions in other specific cases are determined through negotiation between the supplier and purchaser.
b The thickness of insulation screen is excluded from the insulation diameter.
4.2 Code
See Annex A for the composition and meaning of product code.
5 Service Conditions
5.1 Environmental Conditions
Cable shall be able to work normally under the environmental conditions as follows:
a) at an altitude not exceeding 2500m;
b) at an ambient temperature of -40 ℃~+40 ℃;
c) where the average maximum relative humidity of the most humid month is not larger than 95% (the monthly average minimum temperature of the month is 25 ℃);
d) where the ambient temperature during cable laying is not lower than -15℃;
e) in windy, sandy, rainy and snowy weather, and where phenomena like salt mist, acid rain and sandstorm occur occasionally.
Where the service environment goes beyond the said conditions, it shall be subject to negotiation between the supplier and purchaser.
5.2 Operating Conditions
5.2.1 The allowable long-term operating temperature for cable conductor is + 90℃.
5.2.2 Storage at an ambient temperature of -40℃~+70℃ shall be allowed.
5.2.3 Cable shall not be laid in ferruginous conduit but may be laid in non-ferromagnetic conduit.
5.2.4 Cable can work long-term at 33 kV or below.
Foreword i
1 Scope
2 Normative References
3 Terms and definitions
4 Cable Construction and Code
4.1 Cable Construction Types and Dimensions
4.2 Code
5 Service Conditions
5.1 Environmental Conditions
5.2 Operating Conditions
6 Construction
6.1 Conductor
6.2 Conductor Screen
6.3 Insulation
6.4 Insulation Screen
6.5 Isolation
6.6 Sheath
7 Technical Requirements
7.1 Minimum Bend Radius
7.2 Physical and Mechanical Properties
7.3 Electrical Properties
7.4 Safety Performance
8 Test Methods
8.1 Test Conditions
8.2 Appearance Inspection
8.3 Construction Inspection
8.4 Test of Physical and Mechanical Properties
8.5 Electrical Property Test
8.6 Safety Performance Inspection
9 Inspection Rules
9.1 Inspection Classification
9.2 Delivery Inspection
9.3 Type Inspection
9.4 Inspection Items
10 Marking, Packaging, Transportation and Storage
10.1 Marking
10.2 Packaging
10.3 Transportation and Storage
Annex A (Informative) Recommendation of Product Code
