This guidance technical document specifies the model, material, technical requirements, test, acceptance rules, packaging and storage of cross-linked polyethylene insulated power cables with rated voltage of 220kV (Um=252kV) for fixed installation. This guidance technical document is applicable to single-core cables under normal installation and operation conditions, but not to special-purpose cables such as submarine cables. GB/Z 18890.2-2002 Cross-linked polyethylene insulated power cables with rated voltage of 220kV (Um=252kV) and their accessories Part 2: Cross-linked polyethylene insulated power cables with rated voltage of 220kV (Um=252kV) GB/Z18890.2-2002 Standard download decompression password: www.bzxz.net

Guiding technical document for national standardization of the People's Republic of China Rated voltage 220kV (Um=252kV) cross-linked polyethylene insulated power cables and their accessories
Part 2: Rated voltage 220kV (Um=252kV) cross-linked polyethylene insulated power cables
Power cableswithcross-linkedpolyethyleneinsulationandtheiraccessoriesforratedvoltageof220kV（Um=252kV)Part2:Powercablewithcross-linkedpolyethyleneinsulationforratedvoltageof220kV（Um=252kV）1 Scope
GB/Z18890.2-—2002
eqvIEC62067:2001
This guiding technical document specifies the models, materials, technical requirements, tests, acceptance rules, packaging, storage and transportation of cross-linked polyethylene insulated power cables with rated voltage of 220kV (Um=252kV) for fixed installation. This guidance technical document is applicable to single-core cables under normal installation and operation conditions, but not to cables for special purposes such as submarine cables.
2 Referenced standards
The provisions contained in the following standards constitute the provisions of this guidance technical document through reference in this guidance technical document. When this guidance technical document is published, the versions shown are valid. All standards will be revised, and the parties using this guidance technical document should explore the possibility of using the latest versions of the following standards. GB/T2951.1-1997 General test methods for cable insulation and sheath materials Part 1: General test methods Section 1: Thickness and overall dimensions measurement - Mechanical properties test (idtIEC60811-1-1: 1993) GB/T2951.2-1997 General test methods for cable insulation and sheath materials Part 1: General test methods Section 2: Thermal aging test methods (idtIEC60811-1-2: 1985) GB/T2951.4-1997 General test methods for cable insulation and sheath materials GB/T2951.5-1997 General test methods for cable insulation and sheathing materials Part 2: Special test methods for elastomer mixtures Section 1: Ozone resistance test - Hot extension test - Mineral oil immersion test (idtIEC60811-2-1: 1986)
GB/T2951.6-1997 General test methods for cable insulation and sheathing materials Part 3: Special test methods for polyvinyl chloride mixtures Section 1: High Temperature and pressure test - crack resistance test (idtIEC60811-3-1: 1985) GB/T2951.7-1997 General test methods for cable insulation and sheathing materials Part 3: Special test methods for polyvinyl chloride mixtures Section 2: Weight loss test - Thermal stability test (idtIEC60811-3-2: 1985) GB/T2951.8-1997 General test methods for cable insulation and sheathing materials Part 4: Special test methods for polyethylene and polypropylene mixtures Section 1: Environmental stress crack resistance test - Winding test after air heat aging Test method for melt index measurement Method for measurement of carbon black and/or mineral filler content in polyethylene (idtIEC60811-4-1:1985) Test methods for mechanical and physical properties of wires and cables Corrosion extension test GB/T2951.27-1994 GB/T2951.28-1994 GB/T2952.1-1989 GB/T2952.2-1989 Test methods for mechanical and physical properties of wires and cables Extrusion jacket abrasion test Cable outer sheath General rules
Cable outer sheathMetal sheath cableGeneral outer sheathTest methods for electrical properties of wires and cablesConductor DC resistance testGB/T3048.4—1994
GB/T3048.8—1994Test methods for electrical properties of wires and cablesAC voltage testGB/T3048.111994Test methods for electrical properties of wires and cablesDielectric loss tangent testGB/T3048.12—1994Test methods for electrical properties of wires and cablesPartial discharge test (eqvIEC60885—3:1988)2Test methods for impulse voltage of wires and cables (neqIEC60230:1966) GB/T3048.13—1992
GB/T3953—1983 Electrical round copper wire
GB/T3956—1997 Cable conductors (idtIEC90228:1978) GB6995.1—1986 Wire and cable identification marking method Part 1: General provisions GB6995.3—1986
Wire and cable identification marking method Part 3: Wire and cable identification marking GB/T16927.1—1997 High voltage test Test technology Part 1: General test requirements (eqvIEC60060-1: 1989) GB/T18380.1-2001 Cable combustion test under flame conditions Part 1: Vertical combustion test method for single insulated wire or cable (idtIEC603321: 1993) GB/Z18890.1-2002 Rated voltage 220kV (Um-252kV) cross-linked polyethylene insulated power cable and its accessories Part 1: Rated voltage 220kV (Um=259kV) cross-linked polyethylene insulated power cable and its accessories Test methods and requirements for power cable systems
JB5268.2—1991 Cable metal sheath lead sheath JB/T8137—1999 Wire and cable delivery tray JB/T8996—1999 High-voltage cable selection guide (eqvIEC60183:1984) 3 Definitions
In addition to the definitions in GB/Z18890.1, this guiding technical document also adopts the following definitions Approximate value
A value that is neither guaranteed nor checked, for example used in the calculation of other dimensional values. -2
4 Cable characteristics
4.1 The cable characteristics specified in 6.1 of GB/Z18890.1-2002 shall be known and stated in accordance with the requirements of Chapter 6 of GB/Z18890.1-2002, among which the rated voltage of the cable is:
Uo=127kV;
U=220kV;
Um=252kV.
4.2 The maximum allowable temperature of the cable conductor: 90℃ in normal operation and 250℃ in short circuit (maximum 5s). 4.3 The recommended minimum bending radius of the cable installation is 20 times the outer diameter of the cable. 4.4
For the cable use environment, refer to Appendix A (the appendix of tips). 5
Cable Model and Naming
5.1 Codewww.bzxz.net
a) Product Series Code
Cross-linked Polyethylene Insulated Cable
b) Material Characteristic Code
Copper Conductor…
Corrugated Aluminum Sheath·
Polyvinyl Chloride Outer Sheath…
Polyethylene Outer Sheath
c) Water-blocking Structure Code
Longitudinal Water-blocking
Note: Corrugated aluminum sheath includes extruded corrugated aluminum sheath and welded corrugated aluminum sheath. The codes of the two different corrugated aluminum sheaths are both LW without distinction. However, welded corrugated aluminum sheath should be clearly stated in the product name. If welded corrugated aluminum sheath is not stated in the name, it is extruded corrugated aluminum sheath. 5.2 Model
The model is composed of the product series code, conductor, metal sheath and outer sheath characteristic code, and water-blocking structure code in sequence. The cable models and names included in this guidance technical document are shown in Table 1. Table 1 Cable models and names
YJLW02
YJLW03
YJLW02—Z
YJLW03—Z
YJQ02—Z
YJQ03—Z
Cross-linked polyethylene insulation corrugated aluminum sheath or welded corrugated aluminum sheath PVC sheath power cable Cross-linked polyethylene insulation corrugated aluminum sheath or welded corrugated aluminum sheath PVC sheath power cable Cross-linked polyethylene insulation corrugated aluminum sheath or welded corrugated aluminum sheath PVC sheath longitudinal water-blocking power cable Cross-linked polyethylene insulation corrugated aluminum sheath or welded corrugated aluminum sheath PVC sheath longitudinal water-blocking power cable Cross-linked polyethylene insulation corrugated aluminum sheath or welded corrugated aluminum sheath PVC sheath power cable Cross-linked polyethylene insulation aluminum sheath PVC sheath longitudinal water-blocking power cable Cross-linked polyethylene insulation aluminum sheath PVC sheath longitudinal water-blocking power cable 5.3 Specifications
This Guidance Technical Document applies to cables with conductor nominal cross-sections (mm) of 400, 500, 630, 800, 1000, 1200, (1400), 1600, (1800), 2000, (2200), 2500. The cross-sections in brackets are non-preferred conductor cross-sections. 5.4 Product Representation
5.4.1 Products are represented by model, specification and the number of this Guidance Technical Document. 5.4.2 Examples
a) Copper core, single core, conductor cross section 630mm, 220kV cross-linked polyethylene insulation corrugated aluminum sheathed polyethylene sheathed power cable: YJLW03127/2201X630GB/Z18890.2--2002b) Copper core, single core, conductor cross section 1000mm, 220kV cross-linked polyethylene insulation lead sheathed polyvinyl chloride sheathed longitudinal water-blocking power cable: YJQ02-Z127/2201X1000GB/Z18890.2-20026Material
6.1 The copper single wire used as conductor should be TR round copper wire in GB/T3953. 6.2 The insulation material is recommended to be ultra-clean cross-linked polyethylene material. Its performance requirements are shown in Appendix B (Suggestive Appendix) 6.3 The semi-conductive material for shielding is recommended to be ultra-smooth cross-linked semi-conductive material, and its performance requirements are shown in Appendix B (Suggestive Appendix). 6.4 The lead sheath shall be made of lead alloy that meets the requirements of JB5268.2. 6.5 The purity of aluminum used for corrugated aluminum sheath shall generally not be less than 99.6%. 6.6 The outer sheath shall be a polyvinyl chloride-based outer sheath mixture with the code ST and a polyethylene-based outer sheath mixture with the code ST as specified in GB/Z18890.1. Technical requirements
7.1 Conductor
7.1.1 Compacted stranded circular copper conductors shall be used, and conductors with a cross-section of 800mm2 can be selected as compacted conductors or split conductor structures; conductors with a cross-section of 1000mm2 and above shall adopt split conductor structures. The structure and DC resistance of the conductor shall comply with the requirements of GB/T3956 and Table 2. Table 2 Structure and DC resistance of copper conductors
Conductor nominal cross section/mm2
Minimum number of single wires in conductor
Maximum DC resistance of conductor at 20℃α/km0.0470
7.1.2 The surface of the conductor should be smooth, free of oil, burrs, sharp edges, protrusions or broken single wires that damage the shield and insulation. 7.2 Insulation
The nominal thickness of the insulation layer should comply with Table 3.
Table 3 Nominal thickness of insulation layer
Conductor nominal cross section/mm2
400 and 500
1000 and above
Nominal thickness of insulation layer/mm
The minimum measured insulation thickness and insulation eccentricity requirements should comply with the requirements of 10.6.2 in GB/Z18890.1-2002. 7.2.2
7.3 Shielding
7.3.1 Conductor Shielding
The conductor shielding consists of a semi-conductive tape and an extruded semi-conductive layer, with an approximate thickness of 2.0 mm, of which the thickness of the extruded semi-conductive layer is approximately 1.5 mm. The extruded semi-conductive layer shall be evenly coated on the outside of the semi-conductive tape and firmly adhered to the insulating layer. The interface with the insulating layer shall be smooth, without obvious twisted wire convexity, sharp corners, burns or scratches. 7.3.2 Insulation Shielding
The insulation shielding is an extruded semi-conductive layer, with an approximate thickness of 1.0 mm. The insulation shielding shall be co-extruded with the conductor extruded shielding layer and the insulating layer in three layers. The insulation shielding shall be evenly coated on the insulating surface and firmly adhered to the insulating layer. The surface of the insulation shielding and the interface with the insulating layer shall be smooth, without sharp corners, particles, burns or scratches. 7.4 Buffer layer, longitudinal water-blocking structure and radial impermeable barrier layer 7.4.1 Buffer layer
There should be a buffer layer outside the insulating semi-conductive shielding layer, which can be made of semi-conductive elastic material or semi-conductive water-resistant expansion tape with longitudinal water-blocking function. The wrapping should be flat, tight and wrinkle-free. 7.4.2 Longitudinal water-blocking structure
When there is a longitudinal water-blocking requirement for the gap inside the metal sheath of the cable, there should be a longitudinal water-blocking structure between the insulating shield and the metal sheath. The longitudinal water-blocking structure should be made of a semi-conductive water-resistant expansion tape wrapped around it, and the semi-conductive water-resistant tape should be wrapped tightly, flat and without scratches. If there is also a longitudinal water-blocking requirement for the cable conductor, water-blocking ropes and other materials should be twisted into the conductor when it is twisted. 7.4.3 Radial impermeable barrier layer
A metal sheath such as a lead sheath or a corrugated aluminum sheath should be used as a radial impermeable barrier layer. 7.4.3.1 The nominal thickness of the metal sheath should comply with the provisions of Table 4. If the short-circuit capacity requirement of the user cannot be met, measures such as increasing the thickness of the metal sheath or adding sparsely wound copper wire under the metal sheath (tightening the sparsely wound copper wire with reversely wound copper wire or copper tape) should be taken. Table 4 Nominal thickness of metal sheath
Nominal cross section of conductor/mm2
Thickness of lead sheath/mm
Thickness of corrugated aluminum sheath/mm
Nominal cross section of conductor/mm
(Continued)
Thickness of lead sheath/mm
7.4.3.2 The minimum thickness of the lead sheath shall comply with the requirements of 10.7.1 in GB/Z18890.1-2002. Thickness of corrugated aluminum sheath/mm
7.4.3.3 The minimum thickness of the corrugated aluminum sheath shall comply with the requirements of 10.7.2 for corrugated aluminum sheath in GB/Z18890.1-200. 7.5 Outer sheath
7.5.1 The outer sheath of the metal sheath shall be an insulating polyvinyl chloride or polyethylene sheath. The surface of the metal sheath shall be coated with cable asphalt (or hot melt adhesive) anti-corrosion coating. Plastic tape or equivalent tape may be wrapped between the anti-corrosion coating and the outer sheath. Self-adhesive rubber tape may be wrapped around the lead sheath instead of the anti-corrosion coating.
7.5.2 The performance of the outer sheath shall comply with the requirements of Table 5, Table 7 and Table 8 in GB/Z18890.1-2002. The color of the outer sheath is generally black, but in order to adapt to certain special conditions of use of the cable, other colors may be used after consultation between the supply and demand parties. 7.5.3 The nominal thickness of the outer sheath is 5.0mm. The minimum thickness is 4.2mm. 7.5.4 For the lead sheath outer sheath, the average value of the thickness measurement (in mm) rounded to one decimal place shall not be less than the nominal thickness; there is no such requirement for the corrugated aluminum sheath outer sheath. 7.5.5 There should be a uniform and firm conductive layer on the surface of the outer sheath as the outer electrode of the outer sheath withstand voltage test. 7.6 Finished Cable
The inspection of finished cables shall be specified in Chapter 8.
8 Inspection of Finished Cables
The inspection of finished cables is divided into routine tests (code R), sampling tests (code S), type tests (code T) and pre-qualification tests (code P), as shown in Table 5. The items, test methods and test requirements of each type of test shall comply with the provisions of Chapter 8, Chapter 9, Chapter 10, Chapter 12 and Chapter 13 of GB/Z18890.1-2002. Among them, the type test and pre-qualification test shall be carried out on the finished cable system, which are the type test and qualification test of the finished cable system. Table 5 Inspection classification, requirements and test methods for cables No. Test items Partial discharge test Power frequency voltage test DC withstand voltage test for metal sheath outer sheath Conductor structure inspection Conductor DC resistance measurement Insulation thickness measurement Test requirements 9.2 of GB/Z18890.1-2002 GB/Z18890.1-200 29.3
9.4 in GB/Z18890.1—2002
10.4 and 12.5.1 in GB/Z18890.1—2002
10.5 in GB/Z18890.1—2002
10.6 and 12.4.16 in GB/Z18890.1—2002
Test type
Test method
GB/T3048.12
GB /T3048.8
GB/T3048.14
GB/T3048.4
GB/T2951.1
Test items
Metal sheath thickness measurement
Metal sheath outer sheath thickness measurement
Cross-linked polyethylene insulation thermal extension test
Capacitance measurement
Lightning impulse voltage test and subsequent power frequency voltage test
Insulation thickness inspection
Bending test and subsequent partial discharge test TG8 test
Test requirements
GB/Z18890.1—2002 10.7 and 12.5.1GB/Z18890.1—2002 10.6 and 12.5.1GB/Z18890.1—2002 10.9 and 12.5.9GB/Z18890.1—2002 10.10
GB/Z18890.1—2002 10.11
12.4.1 in GB/Z18890.1
12.4.1 in GB/Z18890.1—2002
12.4.6 in GB/Z18890.12002
Thermal cycle voltage test and subsequent partial discharge test 12.4.7 and test in GB/Z18890.1—2002
Lightning impulse voltage test and subsequent power frequency voltage test
Inspection of cable system after electrical type test
Resistivity measurement of semi-conductive shield
Mechanical property test of insulation and sheath
Complete Material compatibility test for finished cable segments
Heat weight loss test for PVC sheath
High temperature pressure test for sheath
Low temperature performance test for PVC outer sheath
Heat shock test for PVC outer sheath
Carbon black content measurement and combustion test for black polyethylene outer sheath
Longitudinal water permeability test
Inspection of micropores and impurities in insulation layer and micropores and protrusions at interface between semi-conductive layer and insulation
Scrape test for outer sheath
Corrosion extension test for corrugated aluminum sheath
Inspection of finished cable markings
Abrasion resistance test for finished cable markings
Inspection of insulation thickness||tt ||Thermal cycle voltage test
Lightning impulse voltage test
Inspection of cable system after pre-qualification test Finished cable marking
12.4.8 in GB/Z18890.1—2002
12.4.9 in GB/Z18890.1—2002
12.4.10 in GB/Z18890.1—2002
12.5.2 and
12.5.4 in GB/Z18890.1—2002
GB/Z18890.1—2002 12.5.5
GB/Z18890.1—200212.5.6
GB/Z18890.1—200212.5.7
GB/Z18890.1—200212.5.8
GB/Z18890.1—200212.5.10
GB/Z18890.1—200212.5.11
GB/Z18890.1-200212.5.12
GB/Z18890.1—200212.5.13
GB/Z 18890.1—2002 12.5.14
12.5.15
Chapter 9
Chapter 9
13.2.1
13.2.3
13.2.4
13.2.5
Test type
Test method
GB/T2951.1 and||t t||GB/Z18890.1
10.7 in 2002
GB/T2951.1
GB/T2951.5
GB/T3048.11
GB/T3048.13 and
GB/T 3048.8
GB/T2951.1
GB/T3048.12
GB/T3048.11
GB/T3048.8 and
GB/T3048.12
GB/T3048.1 3
GB/T3048.8
Visual inspection
Appendix to GB/Z.18890.1—2002
GB/T2951.1
GB/T2951.2
18890.1—2002
GB/T2951.7
GB/T2951.6
GB/T2951.4
GB/T2951.6
GB/T2951.8
GB/T18380.1
GB/Z1 Appendix to GB/Z18890.1-2002
Appendix to GB/Z18890.1-2002
GB/T2951.28
GB/T2951.27
GB/T6995.1-1986 5.2
GB/T2951.1
GB/T3048.8
GB/T3048.13.
Visual inspection
The outer sheath of the finished cable should have a continuous mark of the manufacturer's name, product model, rated voltage, conductor cross-section and manufacturing year, as well as a length mark. The handwriting of the mark should be clear, easy to recognize and resistant to abrasion. The marking of the finished cable should also comply with the corresponding provisions of GB6995.1 and GB6995.3.
10 Acceptance rules
The manufacturer shall carry out routine tests, sampling tests, type tests and pre-qualification tests in accordance with the requirements of this guiding technical document. 10.1 Products shall be inspected and qualified by the quality inspection department of the manufacturer before they can be shipped. Each cable reel shipped shall be accompanied by a product inspection certificate. When required by the user, the manufacturer shall provide a product test report. 10.2 Products shall be inspected and accepted according to the test items specified in Table 5. 11 Packaging, transportation and purchase and storage
11.1 The cable shall be delivered wound on a cable reel that complies with JB/T8137. In order to prevent the cable from being excessively bent, the diameter of the cable reel shall not be less than the cable bending diameter of the type test. The two ends of the cable shall have reliable waterproof and moisture-proof seals, and a traction head for laying shall be installed on the outer end.
11.2 Each cable reel shipped shall be accompanied by a product inspection certificate, which shall be placed in a waterproof plastic bag fixed to the side plate of the cable reel. Each cable drum should be marked with: a) manufacturer name;
b) cable model;
c) rated voltage, kV;
d) nominal cross section, mm;
e) drum length, m;
f) gross weight, kg;
g) cable drum size, m
h) factory cable drum number;
i) manufacturing date, year and month;
j) arrow indicating the direction of laying out the cable drum during transportation; k) the number of this guiding technical document.
11.3 Transportation and storage
a) Cable drums are not allowed to be laid flat
b) It is strictly forbidden to drop cable drums with cables from a height during transportation, and it is strictly forbidden to damage the cables mechanically; c) When lifting the package, it is strictly forbidden to lift several drums at the same time. On vehicles, ships and other means of transport, the cable drum must be placed firmly and fixed in a suitable way to prevent collision or overturning. 12 Electrical test after installation
After the installation of the cable and its accessories, it is recommended to adopt the recommended provisions of Chapter 14 of GB/Z18890.1-2002. -8
A1 Overview
Appendix A
(Suggested Appendix)
Cable use environment
The use environment of the cable in this standard is mainly determined by the performance of the cable metal sheath and plastic outer sheath, so it should generally comply with the provisions of Table 1 in GB/T2952.2-1989
A2 Metal sheath
In addition to being suitable for general places, lead-sheathed aluminum sheathed cables are particularly suitable for the following occasions: Lead-sheathed cables: places with severe corrosion but no nitric acid, acetic acid, organic matter (such as peat) and strong alkaline corrosive substances, and are not subject to mechanical (tension, pressure, vibration, etc.) places.
Aluminum sheathed cable: places where corrosion is not serious and where it is required to withstand certain mechanical forces (such as directly connected to transformers, laid on bridges and shafts, etc.).
A3 plastic outer sheath
-02 type (polyvinyl chloride) outer sheathed cable is mainly suitable for high-voltage cable lines with general fire protection requirements and certain insulation requirements for the outer sheath;
03 type (polyethylene) outer sheathed cable is mainly suitable for directly buried high-voltage cable lines with higher insulation requirements for the outer sheath. If necessary, certain flame retardant and fire prevention measures should be taken when used in tunnels or vertical assemblies. 9
Tensile strength
Elongation at break
Appendix B
(Suggested appendix)
Properties of insulating materials and semi-conductive materials
(200C, 0.20N/mm2, 15min)
Hot extension test
Elongation under load
Permanent deformation
Volume resistivity
Short-time power frequency breakdown strength
Gel content
Insulating material and semi-conductive material properties
—10 —
Insulating material
≥500
≤100
≤5.0×10
≥1.0×1015
Semi-conductive material
≥150
≤100
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