Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by China Electrical Equipment Industrial Association.
This standard is under the jurisdiction of the National Technical Committee on Wires and Cables of Standardization Administration of China (SAC/TC 213).
Flexible and torsion resistant cables of rated voltages from 6kV (Um=7.2kV) up to 35kV (Um=40.5kV) for wind power generation
1 Scope
This standard specifies the service characteristics, product code, marking, technical requirements, inspection rules, test methods and packaging requirements for flexible and torsion resistant cables.
This standard is applicable to the flexible and torsion resistant cables of rated voltages from 6kV up to 35kV for wind power generation used at the connection between turbine and tower in high-power wind power generation equipment or at other similar occasions.
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 156-2007 Standard voltages
GB/T 2423.17-2008 Environmental testing for electric and electronic products - Part 2: Test methods - Test Ka: Salt mist
GB/T 2423.18-2012 Environmental testing - Part 2: Test methods - Test Kb: Salt mist, cyclic (sodium chloride solution)
GB/T 2900.10 Electrotechnical vocabulary - Electric cables
GB/T 2951.11-2008 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 2951.12-2008 Common test methods for insulating and sheathing materials of electric and optical cables - Part 12: Methods for general application - Thermal ageing methods
CB/T 2951.13-2008 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 2951.14-2008 Common test methods for insulating and sheathing materials of electric and optical cables - Part 14: Methods for general application - Test at low temperature
GB/T 2951.21-2008 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 2951.31-2008 Common test methods for insulating and sheathing materials of electric and optical cables - Part 31: Methods specific to PVC compounds - Pressure test at high temperature - Test for resistance to cracking
GB/T 3048.4-2007 Test methods for electrical properties of electric cables and wires - Part 4: Test of DC resistance of conductors
GB/T 3048.5-2007 Test methods for electrical properties of electric cables and wires - Part 5: Test of insulation resistance
GB/T 3048.8-2007 Test methods for electrical properties of electric cables and wires - Part 8: AC voltage test
GB/T 3048.10-2007 Test methods for electrical properties of electric cables and wires - Part 10: Spark test of extruded protective sheaths
GB/T 3048.11-2007 Test methods for electrical properties of electric cables and wires - Part 11: Test for dielectric dissipation factor
GB/T 3048.12-2007 Test methods for electrical properties of electric cables and wires - Part 12: Partial discharge test
GB/T 3048.13-2007 Test methods for electrical properties of electric cables and wires - Part 13: Impulse voltage test
GB/T 3956-2008 Conductors of insulated cables
GB/T 4909.2-2009 Test methods for bare wires - Part 2: Measurement of dimensions
GB/T 4910-2009 Tinned round copper wire
GB/T 6995.1-2008 Markings for electric wires and cables - Part 1: General requirements
GB/T 6995.3-2008 Markings for electric cables and wires - Part 3: Identifications of cables and wires
GB/T 6995.5-2008 Markings for electric wires and cables - Part 5: Identifications of insulated cores of power cables
GB/T 16927.1-2011 High-voltage test techniques - Part 1: General definitions and test requirements
GB/T 18380.12-2008 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 18380.35-2008 Test on electric and optical fibre cables under fire conditions - Part 35: Test for vertical flame spread of vertically-mounted bunched wires or cables - Category C
JB/T 8137-2013 (all parts) Delivery drums for electric wires and cables
JB/T 10696.7-2007 Test methods for determining mechanical, physical and chemical properties of electric cables and wires - Part 7: Tear test
IEC 60229:2007 Electric cables - Tests on extruded oversheaths with a special protective function
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 2900.10 and the following apply.
3.1
nominal value
a designated value, which is frequently applied in tables
Note: In this standard, the quantity value evolved from nominal value is generally inspected through measurement with consideration of the specified tolerance.
3.2
median value
the value in the middle of several values obtained from test which are arranged in increasing (or decreasing) order in the case that the number of values is odd, or the mean value of two values in the middle of such values arranged as above in the case that the number of values is even
3.3
routine tests
R
the test carried out, by the manufacturer, on all manufactured lengths of the finished cables in order to inspect whether all the said cables meet the specified requirements
3.4
sample tests
S
the test carried out, by the manufacturer, on the samples of finished cables or on some components taken from finished cables in order to inspect whether the said cables meet the specified requirements
3.5
type tests
T
the test carried out on a type of cable covered by this standard before supply according to general commercial principle in order to verify that the cable properties meet the intended service conditions
Note: This test is characterized by the fact that once the type test is conducted, it is unnecessary to repeat it unless the cable characteristic is potentially changed due to the change in material, design or manufacturing process of cable
3.6
electrical tests after installation
the test carried out after installation to demonstrate that the installed cable and its accessories are intact
4 Service characteristics
4.1 Rated voltage
The rated voltage U0/U(Um) of the cables in this standard is identified as follows:
U0/U(Um)=3.6/6(7.2)—6/6(7.2)—6/10(12)—8.7/10(12)—8.7/15(17.5)—12/20(24)—18/30(36)—21/35(40.5)—26/35(40.5), expressed in kilovolts (kV).
In the voltage identification U0/U(Um) of cables:
U0——the rated power-frequency voltage of the conductor for cable design to ground or to metallic shield;
U——the rated power-frequency voltage between the conductors for cable design;
Um——the maximum of the "highest system voltage" that can be used by the equipment (see GB/T 156-2007).
4.2 Insulation mixture
See Table 1 for the insulation mixture in the cable and its allowable temperature.
Table 1 Insulation mixture and its corresponding maximum temperature of conductor
Insulation mixture Maximum temperature of conductor/℃
Normal operation Short circuit (maximum duration: 5s)
Ethylene propylene rubber or similar mixture 90 250
The temperatures in Table 1 are determined by the inherent characteristics of the insulation mixture, and other considerations are also important in the calculation of the rated current using these data.
4.3 Sheath mixture
See Table 2 for the allowable temperatures for different types of sheath mixtures in cables.
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Table 2 Allowable temperatures for different types of sheath mixtures
Sheath mixture Code Maximum temperature of conductor under normal operation/℃ Short circuit (maximum duration: 5s)/℃
Chlorosulfonated polyethylene, neoprene or similar polymer SE 90 200
Polyurethane elastomer TPU 90 180
Other thermoplastic elastomers TPV 90 180
4.4 Suitable ambient temperatures of cables
The suitable ambient temperatures of cables are as follows:
——ordinary cables: -25℃~+60℃ (in operation), and 0℃ and above (in laying);
——cold-resistant cables: -40℃~+60℃ (in operation), and -15℃ (in laying).
Note: If there are special requirements, the cable may be designed to have a suitable ambient temperature below -40℃ according to the user's needs, and such ambient temperature shall be indicated in the cable name.
4.5 Minimum bending radius
The minimum bending radius of the three-core cable is 6D, and that of the single-core cable is 8D, where D is the nominal diameter of the cable.
5 Codes, models, specifications and product representation methods
5.1 Codes
Cable series for wind power generation FD
Flame retardancy - Category C ZC
Copper conductor (T) omitted
Ethylene propylene rubber or similar mixture insulation E
Metallic shield (P) omitted
Thermosetting elastomer sheath (chlorosulfonated polyethylene, neoprene or similar polymer) H
Polyurethane elastomer sheath U
Other thermoplastic elastomer sheath S
Suitable minimum ambient temperature: -40℃ (cold-resistant cable) -40
-25℃ -25
5.2 Models and names
See Table 3 for the cable models and names.
Table 3 Models and names
Model Name
FDEH-25 Flexible and torsion resistant cable with ethylene propylene rubber insulation and thermosetting elastomer sheath for wind turbine
FDEH-40 Flexible and cold and torsion resistant cable with ethylene propylene rubber insulation and thermosetting elastomer sheath for wind turbine
FDEU-25 Flexible and torsion resistant cable with ethylene propylene rubber insulation and polyurethane sheath for wind turbine
FDEU-40 Flexible and cold and torsion resistant cable with ethylene propylene rubber insulation and polyurethane sheath for wind turbine
FDES-25 Flexible and torsion resistant cable with ethylene propylene rubber insulation and thermoplastic elastomer sheath for wind turbine
FDES-40 Flexible and cold and torsion resistant cable with ethylene propylene rubber insulation and thermoplastic elastomer sheath for wind turbine
5.3 Specifications
See Table 4 for the cable specifications.
Table 4 Specifications
Model Rated voltage
kV Number of cores Nominal sectional area
mm2
FDEH-25
FDEH-40
FDEU-25
FDEU-40
FDES-25
FDES-40 3.6/6(7.2); 6/6(7.2); 6/10(12); 8.7/10(12); 8.7/15(17.5); 12/20(24); 18/30(36); 21/35(40.5); 26/35(40.5) 1, 3 25~300
5.4 Product representation methods
The product is represented by model, specification (rated voltage, number of cores, nominal sectional area), and the serial number of this standard.
Example 1:
Flexible and cold and torsion resistant cable with ethylene propylene rubber insulation and thermosetting elastomer sheath for wind turbine, with a rated voltage of 8.7/15kV, containing three cores, and with a nominal sectional area of 70mm2 and a total sectional area of wire braided shield (or sparsely wire wound shield) of 16mm2, is represented as: FDEH-40 8.7/15kV 3×70+3×16/3 GB/T 33606-2017.
Example 2:
Flexible and cold and torsion resistant cable with ethylene propylene rubber insulation and polyurethane sheath for wind turbine, with a rated voltage of 26/35kV, containing three cores, and with a nominal sectional area of 95mm2 and only earth wire core (with a total sectional area of 30mm2) having metallic shield, is represented as: ZC-FDEU-40 26/35kV 3×95+3×10 GB/T 33606-2017.
Foreword II
1 Scope
2 Normative references
3 Terms and definitions
4 Service characteristics
5 Codes, models, specifications and product representation methods
6 Conductor
7 Insulation
8 Shield
9 Metallic shield
10 Cabling and filling of three-core cable
11 Sheath
12 Test conditions
13 Routine tests
14 Sample tests
15 Electrical type tests
16 Non-electrical type tests
17 Special type tests
18 Electrical tests after installation
19 Identification mark for cables
20 Acceptance rules
21 Packaging, transportation and storage of cables
Annex A (Normative) Measurement method for resistivity of semi-conductive shield
Annex B (Normative) Torsion test
Annex C (Normative) Load test
Annex D (Normative) Low-temperature bend test for finished cable
Annex E (Normative) Artificial weathering test
Annex F (Normative) Salt spray test
