GB/T 29631-2013 PDF in English
GB/T 29631-2013 (GB/T29631-2013, GBT 29631-2013, GBT29631-2013)
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Flexible and torsion resistant cables of rated voltages up to and including 1.8/3 kV for wind turbine
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GB/T 29631-2013: PDF in English (GBT 29631-2013) GB/T 29631-2013
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.060.20
K 13
Flexible and torsion resistant cables of rated voltages
up to and including 1.8/3 kV for wind turbine
ISSUED ON: JULY 19, 2013
IMPLEMENTED ON: DECEMBER 02, 2013
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword ... 4
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 7
4 Characteristics of use ... 8
5 Code, cable model, representation of product ... 9
6 Cable’s specifications ... 11
7 Technical requirements ... 11
8 Finished cable ... 17
9 Inspection rules and test methods ... 20
10 Delivery length ... 22
11 Packaging, transportation, storage of cable ... 22
Appendix A (Normative) Performance requirements for insulation and sheathing
materials for twist-resistant flexible cables for wind turbine ... 24
Appendix B (Normative) Torsional test method for twist-resistant flexible cable
for wind turbine ... 27
Appendix C (Normative) Load test method of twist-resistant flexible cable for
wind turbine ... 30
Appendix D (Normative) Test method for bending at low-temperature for twist-
resistant flexible cable for wind turbine ... 31
Appendix E (Normative) Artificial weather aging test method for twist-resistant
flexible cable for wind turbine ... 32
Appendix F (Normative) Salt spray test ... 35
Flexible and torsion resistant cables of rated voltages
up to and including 1.8/3 kV for wind turbine
1 Scope
This standard specifies the product code, marking, technical requirements,
inspection rules, test methods and packaging for the flexible and torsion
resistant cables of rated voltages up to and including 1.8/3 kV for the connection
between turbine and tower or similar applications for wind turbine.
This standard applies to flexible and torsion resistant cables of rated voltages
U0/U up to and including 1.8/3 kV for wind turbine.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB/T 2423.17-2008 Environmental testing for electric and electronic
products - Part 2: Test method - 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 2900.10-2001 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
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
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
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 3048.9-2007 Test methods for electrical properties of electric cables
and wires - Part 9: Spark test of insulated cores
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 5013.1-2008 Rubber insulated cables of rated voltages up to and
including 450/750 V - Part 1: General requirements
GB/T 6995.1-2008 Markings for electric wires and cables - Part 1: General
requirements
GB/T 6995.3-2008 Markings for electric wires and cables - Part 3:
Identifications of cables and wires
GB/T 6995.4-2008 Markings for electric wires and cables - Part 4:
Identifications of insulated conductors of cables and wires for electrical
appliances and equipment
GB/T 9330.1-2008 Plastic insulated control cables - Part 1: General
requirements
GB/T 12706.1-2008 Power cables with extruded insulation and their
accessories for rated voltages from 1 kV (Um = 1.2 kV) up to 35 kV (Um =
40.5 kV) - Part 1: Cables for rated voltage of 1kV (Um = 1.2 kV) and 3kV
(Um = 3.6 kV)
GB/T 18380.12-2008 Test on electric and optical fiber cables under fire
conditions - Part 12: Test for vertical flame propagation for a single insulated
wire or cable - Procedure for 1 kW pre-mixed flame test
GB/T 18380.35-2008 Tests on electric and optical fiber cables under fire
conditions - Part 35: Test for vertical flame spread of vertically-mounted
bunched wires or cables - Category C
JB/T 8137 (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
3 Terms and definitions
The terms and definitions as defined in GB/T 2900.10-2001 as well as the
following terms and definitions apply to this document.
3.1
Rated voltage
The reference voltage used for the design, use, electrical performance
testing of cables.
3.2
Batch
The number of products of the same model specifications that are ordered
at one time.
Note: If there are different models of products in one order, different model
specifications are considered as different batches.
3.3
Routine tests
Tests performed by the manufacturer on all manufacturing lengths of the
finished cable, to verify that all cables meet the specified requirements.
3.4
Sample tests
Copper-core ethylene-propylene rubber insulated polyurethane elastomer
sheathed cold-resistant twist-resistant flexible cable for wind turbine, which
has a rated voltage of 0.6/1 kV, (3 + 1) core, nominal cross-sectional area of
10 mm2, cross-sectional area of neutral line of 6 mm2, is expressed as:
FDEU-40 0.6/1 3 × 10 + 1 × 6 GB/T 29631-2013
Example 2:
Copper-core ethylene propylene rubber insulated neoprene rubber sheathed
flame-retardant flexible category-C cable for wind turbine, which has a rated
voltage of 450/750 V, 1 core, nominal cross-sectional area of 95 mm2, is
expressed as:
ZC-FDEF-25 450/750 1×95 GB/T 29631-2013
Table 1 -- Commonly used models and names of cables
Model a Rated voltage Name
FDEF-25
450 / 750 V
Copper-core ethylene-propylene rubber-insulated neoprene rubber-sheathed
twist-resistant flexible cable for wind turbine
FDEF-40 Copper-core ethylene-propylene rubber-insulated neoprene rubber-sheathed cold-resistant twist-resistant flexible cable for wind turbine
FDES-25
450 / 750 V
0.6 / 1 kV
1.8 / 3 kV
Copper-core ethylene propylene rubber-insulated thermoplastic elastomer-
sheathed twist-resistant flexible cable for wind turbine
FDES-40 Copper-core ethylene propylene rubber-insulated thermoplastic elastomer-sheathed cold-resistant twist-resistant flexible cable for wind turbine
FDES-55 Copper-core ethylene propylene rubber-insulated thermoplastic elastomer-sheathed freeze-resistant twist-resistant flexible cable for wind turbine
FDGG-40 0.6 / 1 kV
1.8 / 3 kV
Copper-core silicone rubber-insulated silicon rubber-sheathed cold-resistant
twist-resistant flexible cable for wind turbine
FDGG-55 Copper-core silicone rubber-insulated silicon rubber-sheathed freeze-resistant twist-resistant flexible cable for wind turbine
FDEU-40 0.6 / 1 kV
1.8 / 3 kV
Copper-core ethylene propylene rubber-insulated polyurethane elastomer-
sheathed cold-resistant twist-resistant flexible cable for wind turbine
FDEU-55 Copper-core ethylene propylene rubber-insulated polyurethane elastomer-sheathed freeze-resistant twist-resistant flexible cable for wind turbine
FDEG-40 0.6 / 1 kV
1.8 / 3 kV
Copper-core ethylene-propylene rubber-insulated silicon rubber-sheathed
cold-resistant twist-resistant flexible cable for wind turbine
FDEG-55 Copper-core ethylene-propylene rubber-insulated silicon rubber-sheathed freeze-resistant twist-resistant flexible cable for wind turbine
FDEH-25
0.6 / 1 kV
1.8 / 3 kV
Copper-core ethylene propylene rubber-insulated chlorosulfonated
polyethylene rubber-sheathed twist-resistant flexible cable for wind turbine
FDEH-40
Copper-core ethylene propylene rubber-insulated chlorosulfonated
polyethylene cold-resistant rubber-sheathed twist-resistant flexible cable for
wind turbine
outer layer.
7.2.6.2 Identification by digit
Except for the green/yellow combined color insulated core, all insulated cores
in the cable shall be printed with the digital mark in accordance with 6.2 of GB/T
6995.4-2008. The digital colors shall be the same and have a sharp contrast to
the insulation color.
7.2.6.3 Identification by color code (leading and identification system)
In each layer, there shall be two adjacent insulated cores with easy-to-
distinguish colors. The remaining insulated cores shall have the same color.
For cables which have a grounded protective core, only one of the two easily
distinguishable insulated cores in the outer layer is replaced by an insulated
core of green/yellow combined color.
7.3 Insulated core and filling (if any) stranded cable
The insulated cores shall be stranded together. The outermost stranding pitch
of the cable shall be not more than 12 times the outer diameter of the strand.
When the insulated core is identified by digits, it is arranged from the inner layer
to the outer layer clockwise, starting from the natural number in sequence from
1.
The gap between the insulated cores allows to be filled by a non-hygroscopic
material. The filling material shall be compatible with the cable’s operating
temperature and shall be compatible with the cable’s insulation and shall not
be bonded to the insulated core.
It allows to, before extruding the sheath, wrap the non-hygroscopic fabric tape
around the core.
7.4 Metal shielding
The metal shielding consists of a soft round copper wire or a tinned round
copper wire, wherein the density of metal braid (or winding) is not less than
80%. In order to improve the twist-resistance, it is allowed to add a high
mechanical strength non-metal wire in the braid. For the calculation method of
the diameter of the monofilament and the braid (or winding) density for metal
shielding, see GB/T 9330.1-2008. When calculating the winding density, the
unidirectional coverage factor shall be multiplied by 1/2 based on the original
expression, whilst the rest remains unchanged.
7.5 Sheath
7.5.1 The sheath material shall be one of the extruded solid media as listed in
The insulated core of the finished cable which has a rated voltage of 450/750
V shall withstand a 2.5 kV water immersion withstanding voltage test at ambient
temperature for 5 minutes, without breakdown. The specimen’s length is 10 m
~ 15 m. The duration of water immersion is at least 1 h. For the single-core
cable whose sheath and insulation are extruded at one time, if the sheath
cannot be separated from the insulation, there is no need to remove the sheath
during the test.
8.2.5 4 h voltage test
The insulated core of the finished cable which has a rated voltage of 0.6/1 kV
and 1.8/3 kV shall be subjected to the power-frequency voltage test at ambient
temperature for at least 1 h immersed in water and at the test voltage of 4 U0.
The voltage shall be gradually increased for 4 h. During the test, breakdown
shall not occur. The specimen’s length is 10 m ~ 15 m. For the single-core cable
whose sheath and insulation are extruded at one time, if the sheath cannot be
separated from the insulation, there is no need to remove the sheath during the
test.
8.2.6 Impulse voltage test
The cable which has a rated voltage of 1.8/3 kV shall be subjected to impulse
voltage test. The test shall be carried out on another finished cable of 10 m ~
15 m length. The conductor’s temperature during the test shall be 5 °C ~ 10 °C
higher than the maximum temperature of the conductor during normal operation.
During the test, it shall follow the procedures as specified in GB/T 3048.13-2007
to apply the impulse voltage, which has a peak value of 40 kV. For multi-core
cables without phase-based shielding, each impulse voltage shall be applied
between the conductor of each phase conductor and ground in sequence; the
other conductors are connected together and grounded. The positive and
negative poles of each insulated core of the cable shall withstand 10 times of
the impulse voltage, respectively, without breakdown.
8.3 Non-electrical performance
8.3.1 The mechanical-physical properties of the finished cable’s insulation shall
comply with the requirements of Table A.1.
8.3.2 The mechanical-physical properties of the finished cable’s sheath shall
comply with the requirements of Table A.2.
8.3.3 The finished cable shall withstand the torsion test at normal temperature
and the torsion test at low-temperature as specified in Appendix B. Where
required by the user, the finished cable shall also withstand the torsion test at
high-temperature and loaded torsion test as specified in Appendix B.
8.3.4 The finished cable shall withstand the load test as specified in Appendix
C.
8.3.5 The finished cable shall withstand the bending test at low-temperature as
specified in Appendix D.
8.3.6 Where required by the user, the finished cable shall withstand the artificial
weather aging test as specified in Appendix E.
8.3.7 Where required by the user, the finished cable shall withstand the salt
spray test as specified in Appendix F.
8.3.8 The finished cable shall withstand the single-piece burning test as
specified in GB/T 18380.12-2008.
8.3.9 The ZC type flame-retardant cable shall withstand the bundled cable
burning test as specified in GB/T 18380.35-2008.
8.3.10 The finished cable shall have a continuous manufacturer's name, voltage,
model, other identification marks. The clarity and rub-resistance of the mark
shall comply with the provisions of GB/T 6995.1-2008. The continuity of the
mark shall comply with the provisions of GB/T 6995.3-2008.
9 Inspection rules and test methods
9.1 The product shall be exit-factory after passing the inspection by the
manufacturer. The exit-factory product shall be accompanied by a product
quality inspection certificate.
9.2 For each batch of delivered products, take at least 1 sample. The sampling
quantity may also be specified between the supplier and the purchaser through
negotiation. If the result of the sample test is unqualified, it shall double the
sample to carry out test again for the unqualified items. If it is still unqualified, it
shall test the entire batch of products one by one.
9.3 The appearance of the product shall be checked batch by batch under
normal vision.
9.4 The inspection items, test types, test methods of products shall be in
accordance with Table 10.
have a weight of less than 80 kg may be packaged in coils.
In order to prevent damage during storage and transportation, the products
packaged in drums shall be properly protected. The product in coiled package
is wrapped by multiple layer of strip materials and bundled firmly.
11.2 In the course of transportation of cable, it shall not allow the cable drum to
be horizontally placed. There shall be measures to avoid the cable drum from
rolling. It shall not be shocked, squeezed, or subjected to any mechanical
damage. In the course of long-distance transportation, it shall avoid long-term
sun exposure.
11.3 Each cable drum shall be marked with the following:
a) The name of the manufacturer;
b) Model, specification, voltage level of cable;
c) Length, net weight, total weight of cable;
d) Date of manufacture;
e) Arrow which indicates the correct direction of rolling of the cable drum;
f) This standard number.
11.4 When packaged in coil or in box, the enclosure of each package and box
shall be marked of the following:
a) The name of the manufacturer;
b) Model, specification, voltage level of cable;
c) Length, net weight, total weight of cable;
d) Date of manufacture;
e) Markings on “No moisture” or “No throwing”;
f) This standard number.
11.5 Cables shall be handled by appropriate tools, to avoid damage to the
cables. Cables shall be properly fixed onto the transportation tools. Cables shall
not be stored in open air as much as possible. Cable drums are not allowed to
be placed horizontally.
Appendix B
(Normative)
Torsional test method for twist-resistant flexible cable for wind turbine
B.1 Scope of application
This test method is applicable to all cables in a wind turbine that are directed
from the nacelle to the tower section and that need to be twisted in the course
of wind-orientation of wind turbine.
B.2 Test equipment
The test equipment comprises two parts: a torsional test device and a
temperature control test device. The torsional test device is a device for
mounting a specimen and twisting, whose torsion angle and the torsion speed
shall be adjustable. The temperature control device is a device which provides
an environment of a certain temperature for the specimen in the test process
where there is requirement for temperature. The temperature control range is -
60 °C ~ +60 °C. At the location where the cable is located, the temperature
difference shall not be more than ± 3 °C.
B.3 Preparation of specimen
From the tested cable, cut a 12.5 m length cable sample. For the tests at
different conditions, it shall take sample respectively from the tested cable.
B.4 Test procedure
B.4.1 Test procedure for torsion at normal temperature
First, place the specimen taken in the ambient temperature for 0.5 h. Then fix
the top end of the specimen to the rotating wheel of the torsional test device.
The torsional device shall be placed at a height of 7 m ~ 9 m from the lower end
fixing bracket. Fix the lower end of the specimen to the bracket. The length of
the torsional specimen is L1 + , about 12 m. The torsion process is as follows:
first turn the rotating wheel clockwise for 1440°. Then counterclockwise rotate
it for the same angle to return the specimen to the initial state. Continuously
counterclockwise rotate it for 1440°. Then clockwise rotate it for the same angle
to return the specimen back to the initial state. This forms a cycle. The range of
rotation speed of the rotating wheel is generally 720°/min ~ 2160°/min. When
the user has no special requirement, it is recommended to carry out 10000
cycles of tests.
Appendix E
(Normative)
Artificial weather aging test method for twist-resistant flexible cable for
wind turbine
E.1 Scope of application
This test method is applicable to the determination of artificial weather aging
performance of twist-resistant flexible cables for wind turbine.
E.2 Test equipment
E.2.1 Xenon-lamp weathering box
E.2.1.1 The power of xenon-lamp is 6 kW. The diameter of specimen’s rotating
frame is 800 mm ~ 959 mm. The height is 365 mm. The specimen’s rotating
frame rotates one revolution every minute. The temperature of the box is (55 ±
3) °C. The relative humidity is (85 ± 5)%.
E.2.1.2 The water spray shall be clean tap water. The pressure of the spray
water is 0.12 MPa ~ 0.15 MPa. The inner diameter of the spray nozzle is φ0.8
mm. It is carried out cyclically by 18 min of water spray, illumination, 102 min of
illumination alone.
E.2.2 Tensile testing machine
Display accuracy: ±1%. It is started from above 1/10 of the range of the dials,
but not less than 4% of the maximum load.
E.3 Preparation of specimen
At 500 mm from the end of the tested cable, cut a cable segment of sufficient
length. Remove the insulated core from the cable, to prepare a sheath
specimen (test piece), which can be used for the determination of effective
performance of 3 groups of tests. The segment which has mechanical damage
shall not be used as a specimen for testing. The number of specimens for the
3 groups of tests are as follows:
- At least 5 specimens of the first group, which are used for the measurement
of raw performance;
- At least 5 specimens of the second group, which are used for the
measurement of performance after artificial weather aging for 0 h ~ 1008 h;
- At least 5 specimens of the third group, which are used for the measurement
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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