GB/T 17755-1999 Rated voltage 6kV, 10kV and 15kV extruded insulation single-core and three-core power cables
Some standard content:
GB/T177551999
This standard is formulated based on IFEC92-354:1994 "Rated voltage 6kV, 10kV and 15kV extruded insulation single-core and three-core power cables". It is equivalent to the international standard in terms of technical content, and the writing rules are in accordance with GB/T1.1-1993 "Guidelines for standardization work Unit 1: Drafting and expression rules for standards Part 1: Basic provisions for standard writing". Through the formulation of this standard, my country's shipboard power cables of this voltage level are equivalent to international standards to meet the needs of international trade, technology and economic exchanges in ships and shipboard cables. In view of the fact that low-smoke halogen-free shipboard cables are the development direction of today's shipboard cables, and considering the current situation of low-smoke halogen-free shipboard power cable products of this voltage level abroad, this aspect is added to this standard. This standard is proposed by China State Shipbuilding Corporation. This standard is under the jurisdiction of the Ship Electrical Equipment Sub-Technical Committee of the National Technical Committee for Standardization of Marine Ships. The drafting units of this standard are: China State Shipbuilding Corporation 704th Research Institute, Shanghai Puhong Cable Factory, Changzhou Bayi Cable Co., Ltd. The main drafters of this standard are: Zhu Kai, Xia Yongnan, Jing Biyun, Zhou Xuyuan. 63
GB/T17755—1999
IEC Foreword
1. IEC (International Electrotechnical Commission) is a global standardization organization composed of all national electrotechnical committees (IEC National Committees). The purpose of IEC is to promote international cooperation on all issues related to standardization in the electronic and electrical fields. For this purpose, as well as to carry out other activities, IEC publishes international standards. The formulation of international standards is entrusted to technical committees; any IEC National Committee with an interest in the subject may participate in the formulation of the international standard. International organizations, governmental organizations and non-governmental organizations that have relations with IEC may also participate in the formulation of the international standard. IEC and the International Organization for Standardization (ISO) work closely together under the conditions determined by the agreement between the two organizations.
2. The formal resolutions or agreements of the International Electrotechnical Commission on technical matters, drawn up by technical committees representing all national committees with a special interest in the technical matters, express as far as possible the international consensus on these matters. 3. These resolutions or agreements are published in the form of standards, technical reports or guidance documents, which are recommended for international use and accepted by the national committees in this sense.
4. In order to promote international unification, the IEC national committees agree to explicitly adopt IEC international standards as their national and regional standards to the greatest extent possible. All differences between IEC standards and corresponding national or regional standards should be clearly indicated in the national or regional standards.
International Standard IEC92-354 was prepared by Technical Committee 18A (Cables and Cable Laying) of Technical Committee 18 (Ships and Mobile and Fixed Offshore Electrical Installations) of IEC. The text of this standard is based on the following documents: Draft International Standard
18A(Central Office))73
Voting Report
18A(Central Office)82
Detailed information on the voting to approve this standard can be found in the voting report listed in the table above. 66
1 Scope
National Standard of the People's Republic of China
Rated voltages 6 kV, 10 kV and 15 kV
Single-and three-core shipboard power cables with extruded solid insulation for ratedvoltages 6 kV, 10 k and 15 kyGB/T 17755 - 1999
eqv IEC 92-354:1994
This standard specifies standardized cables so that their safety and reliability can be guaranteed when they are laid in accordance with the requirements of GB/T13029.1; it also specifies the manufacturing requirements, characteristics and test methods for inspection of such cables that are directly or indirectly related to safety. This standard applies to marine power cables with extruded insulation, conductors and insulation shielding layers, and fixed installations with rated voltages of 3.6/6 (7.2) kV, 6/10 (12) kV and 8.7/15 (17.5) kV. Various types of power cables are listed in Chapter 8. Their structural requirements and test methods, unless otherwise specified in this standard, shall comply with the relevant provisions of IEC92350.
The general provisions are listed in Chapters 4 to 7 of this standard, the structural requirements are listed in Chapters 8 to 16, and the test requirements are listed in Chapters 17 to 18.
2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard was published, the versions shown were valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB156—1993 Standard voltage
GB/T2951.5-1997 General test methods for cable insulation and sheath materials Part 2: Special test methods for elastomer mixtures Section 1: Ozone resistance test-hot extension test Mineral oil immersion test GB/T3048.13-1992 Impulse voltage test method for wires and cables GB/T13029.1-1991 Selection and laying of cables for ship low-voltage power systems IEC92-350:1988 General structure and test requirements for ship low-voltage power cables Amendment No. 1 (1994)||tt ||IEC92-351:1983 Insulating materials for shipboard power cables Amendment No. 1 (1992)
Amendment No. 2 (1997)
IEC92-353:1995 Rated voltage 0.6/1kV extruded insulation single-core and multi-core non-radial electric field power cables IEC92-359:1987 Sheath materials for shipboard power cables and communication cables IEC228:1978 Conductors of insulated cables
Instructions for use:
17 The Section in IFC92-354 is described here. Approved by the State Administration of Quality and Technical Supervision on May 19, 1999 and implemented on December 1, 1999
GB/T 17755-—1999
IEC502:1994 Rated voltage 1~~30kV extruded insulated power cablesIEC885-2:1987 Electrical test methods for cables Part 2: Partial discharge test 3 Definitions
This standard adopts the definitions specified in Chapter 2 of IEC92-350:1988. 4 Rated voltage
The nominal rated voltage U./U (U.) of the cable specified in this standard is: 3.6/6 (7.2). 6/10 (12) and 8.7/15 (17.5) kV (effective value). The meaning of the voltage mark is as follows:
U,---Rated power frequency voltage between conductor and shield or metal sheath, for cable design; U-Rated power frequency voltage between conductors, for cable design; Um-System maximum voltage value (see 2.3 in GB1561993). 5 Type of insulating materialwwW.bzxz.Net
The insulating material shall be ethylene propylene rubber (EPR, HFEPR1J) and cross-linked polyethylene (XLPE, HFXLPE\) in accordance with IEC92-351
6 Type of sheath material
The sheath material shall be in accordance with the material specified in IEC92-359. 7 Mark
7.1 Manufacturing mark
The cable shall have a manufacturing mark. The mark can be a line or a tape (longitudinal or wrapped), or a repeated mark of the manufacturer's name and trademark. The mark can be printed or embossed on the insulation or sheath. 7.2 Continuity
A manufacturing mark is considered continuous if the distance between the end of one mark and the beginning of the next mark is not greater than the following values. -550 mm on the sheath.
270 mm for others.
7. 3 Durability
Marks made by printing should be durable and tested according to the test specified in 17.2. 7.4 Clarity
The marking should be legible. The color of the marking line must be easily recognizable. If necessary, it can be wiped with an appropriate solvent (such as anhydrous ethanol) to make it more recognizable.
7.5 Core identification
The cable cores shall be identified by a suitable method, such as color separation or printing 2. Instructions for use:
17IEC92-351 has new modifications and new content. 2］New content.
8 General provisions for structural requirements
GB/T 17755-1999
Ship cables for fixed installation in power systems of this voltage level should use single-core or three-core radial electric field cables. Its structure is as follows: copper conductor, semi-conductive shielding layer of the conductor, insulating layer, semi-conductive and metallic shielding layer of the insulating layer, cabling (three-core cable), inner lining layer (if necessary), one or two sheaths and optional metal armor layer. The sheath is allowed to adopt the following types of structures: a) Using materials such as nitrile rubber, chlorinated polyethylene, chlorosulfonated polyethylene, polyvinyl chloride or low-smoke halogen-free polyolefin (SHF2): forming a single-layer sheath.
b) The inner sheath is made of chloroprene rubber, chlorinated polyethylene or chlorosulfonated polyethylene, and the outer sheath is made of polyvinyl chloride. c) One of the materials such as chloroprene rubber, fluorinated polyethylene, chlorosulfonated polyethylene, polyvinyl chloride or low-smoke halogen-free polyolefin (SHF2) is used to form a single-layer sheath with a metal braided layer.
d) The inner sheath is made of one of the materials such as chloroprene rubber, chlorinated polyethylene, chlorosulfonated polyethylene or polyvinyl fluoride, with a metal armor layer, and the outer sheath is also made of one of the materials such as chloroprene rubber, chlorinated polyethylene, chlorosulfonated polyethylene or polyvinyl chloride. The inner sheath is made of low-smoke halogen-free polyolefin (SHF2), with a metal armor layer, and the outer sheath is also made of SHF2 material. When the outer sheath material needs to be vulcanized, polyvinyl chloride cannot be used for the inner sheath. Note
1 The structural types listed in IEC92-353 have been adopted except for item c). 2 When the cables are laid and used in places where corrosion may occur, such as open decks, wet places, battery compartments, cold storage rooms, etc., a sheath should be added outside the braided layer unless the metal braided layer of these cables is made of corrosion-resistant materials. 9 Conductor
The material, metal coating and conductor type should comply with the provisions of Chapter 3 of IEC92-350:1988. The conductor shape should be a non-compacted or compacted twisted round and should comply with the Class 2 structure of IEC228:1978. For cables with a rated voltage of 3.6/6 (7.2) kV, the minimum cross-sectional area is 10 mm2, 6/10 (12) kV is 16 mm2, and 8.7/15 (17.5 kV) is 25 mm2.
For single-core cables, the maximum cross-sectional area is 630 mm2, and for three-core cables it is 150 mm. 10 Insulation layer
10.1 Material
One of the materials in Chapter 5 shall be used as extruded insulation. 10.2 Electrical and non-electrical properties of insulation
shall comply with the provisions of IEC92-351.
10.3 Insulation thickness
a) The nominal values of insulation thickness are shown in Table 1.
b) The average value of insulation thickness shall not be less than the nominal value specified for each insulation type and each cross-sectional area listed in Table 1. c) The thickness of the thinnest part of the insulation layer shall not be less than .90% of the nominal value minus 0.1mm. d) The thickness of the semi-conductive shielding layer on the conductor or the insulated core is not included in the insulation thickness. Instructions for use:
1 New content.
Nominal cross section
Wire core shield
GB/T 17755 --1999
Table 1 Nominal thickness of insulation layer
Ethylene propylene rubber
(EPR, HFEPR'3)
6/10ky
8. 7/15 kV
Wire core shield consists of conductor shield and insulation shield. 11.1 Conductor shield
3. 6/6 kV
Cross-linked polyethylene
(XLPE.HFXLPE)\)
6/10kv
The conductor shield is made of non-metallic material. It can be composed of extruded semi-conductive layer alone or a composite of semi-conductive tape and extruded semi-conductive layer.
11.2 Insulation shielding layer
a) The insulation shielding layer shall be composed of a semi-conductive layer composed of non-metallic materials and a metal part. b) The non-metallic part of the insulation shielding layer shall be directly wrapped on each insulating core. It can be composed of a directly extruded semi-conductive layer alone or a semi-conductive tape plus an extruded semi-conductive layer. c) The metal part of the insulation shielding layer shall be added to each core separately and shall comply with the provisions of Chapter 12. 12 Metal shielding layer
12.1 Structure
The metal shielding layer shall be in the form of single-layer or multi-layer tape wrapping, braiding, wire coaxial wrapping, tape and wire composite, etc. 12.2 Requirements
Among other requirements, the current value that can be withstood in the event of a fault shall be considered to determine the size, physical and electrical performance requirements of the metal shielding layer.
Adoption instructions:
11 New content.
21 Omitted from IEC92-354.
13 Cabling
GB/T 17755 --1999
The cores of three-core cables shall be cabled, and the gaps shall be filled with materials in accordance with Chapter 5 of IEC92-350, or with inner lining.
14 Inner lining, filling and wrapping
General requirements
The inner lining may be extruded or wrapped, and its relevant materials and properties shall comply with 6.1 of IEC92-350:1988. The test method is listed in 18.4e).
14.2 Thickness of inner lining
The approximate thickness of the inner lining by extrusion or wrapping is shown in Table 2. ：Thickness of inner lining
Assumed diameter after cabling
>25～35
>35~45
>45~60
>60~80
Thickness of extruded inner lining (approximate value)
Assumed diameter after cabling is 40mm and below, 0.4mm thick tape is used for wrapping, and 0.6mm thick tape is used for wrapping above 40mm.
Note: For the calculation of the assumed diameter, see Appendix A and Appendix B of IEC92-359;1988. 15 Non-metallic sheath
15.1 Electrical and non-electrical properties of sheath material The sheath shall be made of one of the sheath materials specified in IEC92-359. 15.2 Sheath thickness
The thickness of the outer sheath and inner sheath (if any) is a function of the inner diameter of the sheath. The assumed diameter is calculated according to the provisions of Appendix A and Appendix B of IEC92-350:1988. The calculation formula of
sheath thickness is as follows:
a) For single-layer sheathed cable with or without armor, according to formula (1) ti=0.04D+0.8mm (but the minimum thickness is 1.0mm) sheath thickness.mm;
Where: t-
D-Assumed diameter when not covered with sheath, mm. (b) c) Same as) b) For double-layer sheathed cable without armor, according to formula (2) and formula (3) inner sheath t=0.025D+0.6mm (but the minimum thickness is 0.8mm) outer sheath t2=0.025D+0.9mm (but the minimum thickness is 1.0mm) Where: t-inner sheath thickness, mm;
outer sheath thickness, mm.
c) For double-layer sheathed cables with armored layers, according to formula (4) and formula (5), inner sheath t=0.04D+0.8mm (but the minimum thickness is 1.0mm) outer sheath t2=0.025D+0.6mm (but the minimum thickness is 0.8mm) where t. Inner sheath thickness, mm;
(1)
· (2)
(3)
.... (4)
(5)
Outer sheath thickness, mm.
GB/T 17755-1999
The average value of the sheath thickness and the value at any point in the thickness shall comply with the provisions of 7.6.2 of IEC92-350:1988. 15.3 Color of sheath
Unless otherwise required by the customer when placing an order, the color of the sheath should be black or gray. 16 Metal armor layer
16.1 Types of metal armor layer
This standard specifies the following types of armor layer: a) braided armor;
b) round or flat metal wire armor;
c) double-layer tape armor.
16.2 Materials and structure
The materials and structure of the armor layer shall comply with 7.2, 7.3 and 7.4 of IEC92-350:1988. When selecting the armor layer material, special attention should be paid to its corrosion resistance. When single-core cable is used in AC circuits, non-magnetic materials should be selected. However, in special cases, if it is used in DC circuits, magnetic materials can still be used.
16.3 Use of armor layer
When the armor layer is used, the armor layer should not adhere to the inner and outer sheaths. 16.4 Size of round metal wire or tape for armor The nominal diameter of the round metal wire for armor, the nominal thickness of the armor tape and flat metal wire should not be less than the values in Table 3 and Table 4. a) The diameter of the braiding wire, regardless of the metal used, is specified as follows: When the assumed diameter of the cable before braiding is less than or equal to 30mm, use 0.3mm wire for braiding. When the assumed diameter of the cable before braiding is greater than 30mm, use greater than or equal to 0.4mm wire for braiding. b) The diameter of the round wire for armor, see Table 3. Table 3 Diameter of round wire for armor
Assumed diameter before armoring
>15 ~25
>25~～35
>35～60
c) The thickness of the armor tape, see Table 4.
Thickness of armored tape
Assumed diameter before armoring
>30~70
Galvanized steel tape
d) The nominal thickness of the flat steel wire used for flat wire armoring should be 0.8mm. 16.5 Round wire or flat wire armoring
Armored single wire diameter
Aluminum alloy tape
a) The metal wire armor layer should be tight, that is, the gap between adjacent metal wires is extremely small. If necessary, a galvanized steel tape with a minimum nominal thickness of 0.3mm can be sparsely wrapped on the flat steel wire or round steel wire armor layer. The allowable deviation of this steel tape shall comply with the provisions of 10.6 of IEC92-350:1988.
b) If the diameter of the cable before armoring is less than 15mm, braided wire armor is not allowed. 72
16.6 Metal tape armor
GB/T 17755---1999
Double-layer metal tape armor should be wound with a spiral gap. The gap should not be greater than 50% of the width of the metal tape, and the gap of the inner metal tape should be covered by the part of the outer metal tape near the middle. 17 Special tests
17.1 Compatibility test between conductor and semi-conductive shielding layer and insulation layer The test method and requirements are under consideration.
17.2 Marking durability test
Inspect according to the requirements of 7.3, and gently rub the wire core with water-soaked absorbent cotton or cloth 10 times. The manufacturer's name, trademark and other manufacturing marks on the wire core and the color of the identification line are not allowed to be removed. 18 Finished cable test
Such tests should be carried out in accordance with the relevant provisions of IEC92-350. The insulation and sheath test methods shall be carried out in accordance with the relevant provisions of IEC92-351 and IEC92-359.
18.1 Routine test
a) Conductor resistance measurement shall be carried out in accordance with 9.2 of IEC92-350:1988. b) Partial discharge test shall be carried out in accordance with IEC885-2. At 1.5U., the partial discharge amount shall not exceed 20pC. c) High voltage test shall be carried out in accordance with 9.3c and e of IEC92-350:1988. The power frequency test voltage value is shown in Table 5. Table 5 Power frequency test voltage value
Rated voltage U.
Test voltage value (effective value)
18.2 Special test
a) Conductor inspection shall be carried out in accordance with 10.3 of IEC92-350:1988. 6.0
b) Cable size inspection shall be carried out in accordance with 10.4, 10.5, 10.6 and 10.7 of IEC92-350:1988. 8.7
c) Thermal elongation test of EPDM, XLPE, chloroprene rubber and low smoke halogen polyolefin (SHF21) shall be carried out in accordance with Chapter 9 of GB/T2591.5-1997.
d) Low temperature test of polyvinyl chloride plastic shall be carried out in accordance with 10.9 of IEC92350:1988. e) Braiding density inspection shall be carried out in accordance with 10.6b of IEC92-350:1988. f) Electrical performance test: Except for the terminal, the length of the finished cable sample shall be not less than 5mm, and pressure shall be gradually applied to 3 times the power frequency voltage (3U.) between each conductor and the metal shielding layer at room temperature, and maintained for 4 hours. 18.3 Electrical performance type test
Electrical performance type test items are listed in 18.3.1. This test is conducted by sampling 10~~15m from the finished product, except for the terminal. Except as specified in 18.3.2, all tests in 18.3.1 should be conducted item by item on the same sample. For three-core cables, all tests and measurements should be conducted on each core. 18.3.1 Test sequence
The normal sequence of tests is as follows:
a) Partial discharge test;
b) Partial discharge test after bending test, the discharge amount at 1.5U should be recorded (according to 18.3.4); c) Measure the relationship between tga and voltage and measure capacitance (according to 18.3.5); d) Measure the relationship between tgo and temperature (according to 18.3.6); Instructions for use:
1 New content.
GB/T 17755-1999
e) After the thermal cycle test, the partial discharge test shall be conducted at 1.5U. The discharge amount shall be recorded (according to 18.3.7); f) Impulse voltage test, and the subsequent power frequency voltage test (according to 18.3.8). 18.3.2 Special provisions
In addition to the test items c) and d) being conducted in the order specified in 18.3.1, it is allowed to take another sample (according to 18.3) for further testing. 18.3.3 Partial discharge test
This test shall be conducted in accordance with the provisions of IEC885-2. The voltage value is 1.5U. The discharge amount shall be measured and recorded. The discharge amount shall not be less than 20 pC.
18.3.4 Bending test
a) At room temperature, the sample is placed on a cylinder (such as the body of a cable drum) and wound at least one full circle, then unwound, reversed and bent in the opposite direction. The test is repeated three times.
b) The diameter of the cylinder should be:
For single-core cable: 20(d+D)±5%
For multi-core cable: 15d+D)±5%
Where D is the measured outer diameter of the cable sample in mm, and d is the measured conductor (1). Note: How to simplify and round the cylinder diameter is under consideration. After completing the above test, the sample is subjected to a partial discharge test again, and the result should meet the requirements of 18.3.3. 18.3.5 Measurement of the relationship between tg? and voltage value
a) The measurement of tgd should be carried out after the bending test 4 in 18.3.4 and at ambient temperature, applying 0.5Uo, U. and 2U. AC voltage values. b) The measurement result of tg should not exceed the value in Table 6. Table 6 Relationship between tg and test voltage
EPDM
U. When tg (×10-*) is not greater than
0.5U. and 2U., Atge (×104) is not greater than 18.3.6 Measurement of the relationship between tg and temperature
cross-linked polyethylene
a) Place the finished cable in a constant temperature liquid tank, oven or in a power-heated metal shielding layer. The conductor temperature can be determined by measuring the conductor resistance or measuring the surface of the constant temperature tank, oven or shielding layer with a thermometer. Heating should be carried out gradually until the conductor temperature reaches 85C. b) tgo should be measured at the specified temperature with a 2kV power frequency voltage. c) The measurement results should comply with the requirements of Table 7. Table 7 Relationship between tg and temperature
EPDM
At room temperature, tg (×104) is not greater than
At rated cable temperature (85C), tga (×10-4) is not greater than 18.3.7 Heating cycle plus partial discharge test 200
Cross-linked polyethylene
a) After the above test, place the sample on the floor of the test room and heat the conductor with alternating current until the conductor temperature reaches and stabilizes at 95C. For multi-core cables, each conductor core should be heated. The heating current should be passed for at least 2 hours, followed by natural cooling in the air for 4 hours, and this cycle should be repeated 3 times.
b) After the third cycle, the cable sample should be subjected to partial discharge test according to the requirements of 18.3.3 and should meet the requirements of this clause. 18.3.8 Impulse voltage test and subsequent power frequency voltage test a) This test requires the conductor temperature to be 90°C, and the impulse voltage value shall comply with the requirements of GB/T3048.13 b) The cable shall withstand 10 positive and negative impulse voltage tests without breakdown, and the impulse voltage value is shown in Table 8. 74
Rated voltage U.
Test voltage (peak value)
GB/T17755--1999
Table 8 Impulse voltage value
c) After undergoing tests a) and b), the cable sample shall withstand a power frequency high voltage test for 15 minutes at room temperature (pressurized to each core). The test voltage value shall comply with the provisions of 18.1c). The insulation shall not be broken down. 18.4 Other non-electrical performance type tests
a) The insulation thickness measurement shall be carried out in accordance with the provisions of 12.1 of IEC92-350:1988. b) Sheath thickness measurement shall be in accordance with IEC92-350:1988, 12.2. c) The non-electrical properties of the insulation layer shall be carried out in accordance with 12.3, 12.10 and 12.11 of IEC92-350:1988. d) The non-electrical properties of the sheath shall be carried out in accordance with 12.4, 12.11 and 12.12 of IEC92-350:1988. e) The additional aging test of the finished cable shall be carried out in accordance with 12.15 of IEC92-350:1988. f) The combustion test shall be carried out in accordance with 12.13 of IFC92-350:1988. g) The halogen acid gas content shall be carried out in accordance with IEC92-351 and IEC92-359. h) The light transmittance in smoke shall be carried out in accordance with IEC92-351 and IEC92-359. Instructions for use:
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