GB/T 18890.3-2015 PDF English
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GB/T 18890.3-2015: Power cables with cross-linked polyethylene insulation and their accessories for rated voltage of 220 kV (Um=252 kV) -- Part 3: Accessories
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GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.060.20
K 13
Replacing GB/Z 18890.3-2002
Power cables with cross-linked polyethylene insulation and
their accessories for rated voltage of 220 kV (Um=252kV) -
Part 3.Accessories
Issued on: OCTOBER 09, 2015
Implemented on: MAY 01, 2016
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 6
2 Normative references... 6
3 Terms and definitions... 8
4 Service condition... 10
5 Product naming... 12
6 Technical requirements... 16
7 Accessory marking... 19
8 Tests and requirements... 19
9 Acceptance rules... 22
10 Packaging, transportation and storage... 23
Appendix A (Informative) Properties of semi-conductive rubber belt... 25
Appendix B (Informative) Properties of cured epoxy resin (colloid)... 26
Appendix C (Informative) Properties of liquid insulating fillers... 27
Appendix D (Informative) Installation guide... 28
D.1 Scope... 28
D.2 General... 28
Bibliography... 29
Power cables with cross-linked polyethylene insulation and
their accessories for rated voltage of 220 kV (Um = 252 kV) -
Part 3.Accessories
1 Scope
This Part of GB/T 18890 specifies the basic structure, model naming, technical
requirements, test and acceptance rules, packaging, transportation and storage for
accessories of power cables with cross-linked polyethylene insulation for rated voltage
of 220 kV (Um = 252 kV).
This Part is applicable to outdoor termination, gas-immersed termination for GIS, oil-
immersed termination, straight joint and sectionalizing joint for power cables with
cross-linked polyethylene insulation for rated voltage of 220 kV (Um = 252 kV), which
comply with GB/T 18890.1-2015 under general installation conditions.
This Part does not apply to belt-insulated joints, transition joints for connecting cables
with cross-linked polyethylene insulation and paper insulated cables, and detachable
cable terminals.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this
document and are indispensable for its application. For dated references, only the
edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
GB 311.1-2012, Insulation co-ordination - Part 1.Definitions, principles and rules
GB/T 1527-2006, Drawn tube of copper and copper alloys
GB/T 2900.10-2013, Electrotechnical terminology - Electric cables
GB/T 3048.8-2007, Test methods for electrical properties of electric cables and
wires - Part 8.AC voltage test
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
3 Terms and definitions
For the purposes of this document, the following terms and definitions, as well as those
given in GB/T 18890.1-2015 and GB/T 2900.10-2013, apply. For ease of use, some
terms and definitions in GB/T 2900.10-2013 are repeated below.
3.1
outdoor termination
Cable termination intended for use in situations where it is exposed to direct sunlight
or weather conditions, or both.
[GB/T 2900.10-2013, definition 461-10-14]
3.2
termination with porcelain insulator
(Outdoor) cable termination with porcelain bushing as outer insulation.
3.3
termination with composite insulator
(Outdoor) cable termination with composite insulator – composed of a glass fiber
reinforced epoxy tube as the lining core and a weather-resistant and anti-fouling
elastomer material (such as silicone rubber) – as the outer insulation.
3.4
gas-immersed termination for GIS
Cable termination installed inside a gas-insulated metal-enclosed switchgear (GIS)
device with sulfur hexafluoride (SF6) gas as its outer insulation.
3.5
oil-immersed termination
Cable termination installed in the oil tank of an oil-immersed transformer equipment
with a liquid insulation part using insulating oil as its external insulation.
3.6
straight joint
3.13
minimum functional pressure
The minimum working pressure of the insulating medium, expressed as relative
pressure or absolute pressure (Pa), converted to standard atmospheric conditions (20 °C,
101.3 kPa), greater than or equal to this pressure at which the switchgear and gas-
immersed termination for GIS maintain their rated characteristics.
Note. See 3.6.5.5 in GB/T 11022-2011.
4 Service condition
4.1 Rated voltage and conductor operating temperature
The rated voltage, maximum operating temperature and short-circuit temperature of the
accessories during normal operation are consistent with the provisions for cables in
Chapter 4 of GB/T 18890.2-2015.
4.2 Environmental conditions (for outdoor termination)
4.2.1 Standard reference atmospheric pressure conditions
The standard reference atmospheric pressure conditions are.
-- temperature, t0 = 20 ℃;
-- pressure, p0 = 101.3 kPa;
-- absolute humidity, h0 = 11 g/m3.
The test voltages specified in this Part are all values under standard reference
atmospheric pressure conditions.
4.2.2 Normal service conditions
The test voltages specified in this Part are applicable to equipment operating under the
following service conditions.
a) The maximum ambient air temperature does not exceed 40 °C;
b) The altitude of the installation site does not exceed 1 000 m.
4.2.3 Temperature correction of test voltage value
For equipment where the ambient air temperature is higher than 40 ℃, the test voltage
of the external insulation in the dry state shall be the test voltage value specified in this
Part multiplied by the temperature correction factor KT. The temperature correction
factor is calculated as formular (1).
Where.
T – ambient air temperature, in degrees Celsius (℃).
4.2.4 Altitude correction of test voltage value
The dielectric strength of the external insulation of outdoor termination used at altitudes
above 1 000 m but not exceeding 4 000 m shall be corrected for altitude. The correction
method is shown in Appendix B of GB 311.1-2012.For outdoor termination installed
and used at an altitude higher than 1 000 m but not exceeding 4 000 m, when tested at
an altitude not higher than 1 000 m, the test voltage shall be the test voltage specified
in this Part multiplied by the altitude correction factor Ka [calculated as shown in
Formula (2)], and the insulation level of the external insulation of the outdoor
termination shall be increased accordingly.
Where.
H – the altitude of the outdoor termination installation location, in meters (m).
4.2.5 Pollution environment
The external insulation environment classification, pollution type and site pollution
severity (SPS) grade shall comply with GB/T 26218.1-2010.
4.2.6 Special environmental conditions
Equipment designed for use in special environmental conditions, such as earthquakes,
hurricanes, icing and other abnormal conditions, may require certain specific tests. See
GB/T 21429-2008, GB/T 23752-2009 and GB/T 4109-2008.This Part does not provide
for these tests.
4.3 Pressure on gas-immersed termination for GIS
The design pressure (relative pressure) of the SF6 gas surrounding the external
insulation of the gas-immersed termination for GIS is 0.75 MPa at 20 °C, and the
minimum functional pressure shall not exceed 0.25 MPa (relative pressure). The rated
inflation pressure of GIS shall not be lower than its minimum functional pressure.
When the GIS enclosure to which the cables are connected is evacuated as part of the
SF6 filling process, the cable terminals shall withstand vacuum conditions (see IEC
62271-209.2007).
4.4 Termination installation angle
The termination shall generally be installed vertically. If the angle between the axis of
the terminal and the vertical line exceeds 30°, the bending resistance load specified in
GB/T 4109-2008 shall be met. This requirement does not apply to gas-immersed
termination for GIS and transformer termination.
4.5 System category
The system categories for which the accessories included in this Part are applicable are
consistent with the requirements of 4.1 of GB/T 18890.2-2015.
5 Product naming
5.1 Code
5.1.1 Series code
Cables with cross-linked polyethylene insulation ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ YJ
5.1.2 Accessories code
(Outdoor) termination with porcelain insulator ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ ZW
(Outdoor) termination with composite insulator ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ ZWF
Gas-immersed termination for GIS ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ ZG
Oil-immersed (transformer) termination ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ ZY
Straight joint ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ JT
Sectionalizing joint ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ JJ
5.1.3 Internal insulation code
5.1.3.1 Termination internal insulation characteristics
Liquid-filled insulation ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Y
Dry insulation ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ G
Sulfur hexafluoride (SF6) gas-filled insulation ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Q
5.1.3.2 Joint internal insulation characteristics
The specifications of accessories shall be compatible with the cross-section of the
matching cable conductor.
The specifications of gas-immersed termination for GIS and oil-immersed (transformer)
termination shall be compatible with the rated voltage and rated current of their
supporting equipment.
5.4 Product representation method
Products are indicated by model, specifications (rated voltage, number of phases,
applicable cable cross-section) and standard number.
Example 1.Liquid-filled insulated termination with porcelain insulator for power
cables with cross-linked polyethylene insulation, of nominal conductor cross-sectional
area 1 000 mm2, rated voltage 127/220 kV, external insulation pollution severity c, is
expressed as. YJZWY2 127/220 1×1000 GB/T 18890.3-2015.
Example 2.Dry insulated gas-immersed termination for GIS for power cables with
cross-linked polyethylene insulation, of nominal conductor cross-sectional area 630
mm2, rated voltage 127/220 kV, is expressed as. YJZGG 127/220 1×630 GB/T 18890.3-
2015.
Example 3.One piece pre-molded sectionalizing joint for power cables with cross-
linked polyethylene insulation, of nominal conductor cross-sectional area 1 600 mm2,
rated voltage 127/220 kV, with insulated copper shell protection box, is expressed as.
YJJJI2 127/220 1×1600 GB/T 18890.3-2015.
6 Technical requirements
6.1 Conductor connection fittings
Conductor connecting rods shall be made of copper materials that comply with GB/T
4423-2007.
Conductor connecting tubes shall be made of copper materials that comply with GB/T
1527-2006.The copper content of the crimped conductor connecting tube shall not be
less than 99.90% and it shall be annealed.
The termination terminals shall be made of copper or copper alloy with good
conductivity, and their dimensions shall comply with IEC/TR 62271-301.2009 or user
requirements.
The surface of the conductor connection fittings shall be smooth and clean, and free of
damage, burrs, concave-convex marks or other defects that affect electrical contact and
mechanical strength. The contact surface and connection holes of the cast terminals
shall not have defects such as air holes, sandish holes and slag inclusions.
The specifications of the connection fittings shall not be smaller than the cross-section
of the cable conductor. The mechanical strength of the connection fittings shall meet
the requirements of installation and operation conditions.
When required, conductor connecting rods and conductor connecting tubes may be
subjected to the tests specified in 8.4.2 to demonstrate that their performance meets the
requirements.
6.2 Structural fittings
Accessory structural fittings (metal shell, flange, sleeve, surrounding bracket, etc.) shall
be made of non-magnetic metal materials.
The mating surface of the spring compression device shall be smooth and free of
protrusions, and shall fit tightly with the rubber stress cone to provide the specified
design pressure within the design life.
All sealing fittings shall have good assembly sealing and fit, and shall not have defects
that may cause subsequent leakage, such as scratches, dents, etc. The sealing
performance shall comply with the test requirements specified in 8.4.1.
6.3 Sealing ring and semi-conductive rubber belt
The sealing rings used for accessories shall be compatible with the surrounding media
and be able to maintain their functionality for a long time under rated load.
The semi-conductive rubber belt used for shielding shall be cross-linked. Its properties
are shown in Appendix A.
6.4 Rubber stress cones and prefabricated rubber insulation parts
For the properties of insulating materials and semi-conductive materials used in rubber
stress cones and prefabricated rubber insulating parts, refer to GB/T 20779.2-2007 (not
applicable to the artificial weathering and tracking resistance tests).
Rubber stress cones and prefabricated rubber insulation parts shall be free of bubbles,
burnt materials and other harmful impurities, and the inner and outer surfaces shall be
smooth without scars, cracks and protrusions. The interface between insulation and
semi-conductivity shall be well bonded, without cracks or peeling, and there shall be
no harmful impurities in the semi-conductive shield.
The dimensions of the rubber insulation shall be compatible with the outer diameter of
the cable's main insulation.
6.5 Epoxy prefabricated parts and epoxy casings
For the properties of cured epoxy resin, refer to Appendix B.
22381-2008.Other matching dimensions may also be used when the termination
manufacturer and the GIS switch manufacturer agree.
The supplier boundaries between terminal manufacturers and GIS switch manufacturers
can be found in Figures 2 and 4 of IEC 62271-209.2007 or Tables A.1 and A.3 of GB/T
22381-2008.
Gas-immersed termination for GIS shall adopt a structure that prevents SF6 gas from
entering the terminal and the cable.
6.12 Accessory products
Accessory products and their main components shall comply with the requirements of
Chapters 7 and 8.
7 Accessory marking
7.1 Product marking
Each cable accessory product shipped out of the factory shall have a clear durability
marking, the content of which is as follows.
a) Name of manufacturer;
b) Model and specifications;
c) Rated voltage, kV;
d) Production date and serial number.
7.2 Marking of parts
Parts such as joint protection boxes and prefabricated rubber insulation parts shall be
marked with the manufacturer's name, model and specifications in an appropriate
manner.
8 Tests and requirements
8.1 General
The tests are divided into routine test (code-named R), sample test (code-named S),
type test (code-named T), additional test (code-named A) and pre-qualification test
(code-named PQ).
The test conditions shall comply with the requirements of Chapter 8 of GB/T 18890.1-
2015.
8.2 Routine test of accessory parts
Routine test of prefabricated rubber insulation parts for accessories shall include the
following items.
a) Sealing test of sealing fittings;
b) Partial discharge test of prefabricated rubber insulation parts (see 9.2 of GB/T
18890.1-2015);
c) Voltage test of prefabricated rubber insulation parts (see 9.3 of GB/T 18890.1-
2015).
Prefabricated rubber insulation parts include stress cones or integrally prefabricated
composite stress control insulation parts.
The sealing test of sealing fittings may be carried out using one of the methods specified
in 8.4.1.1 or 8.4.1.2 according to the applicable conditions. Other tests shall be carried
out in accordance with Chapter 9 of GB/T 18890.1-2015 and meet the requirements.
Note. With the consent of the manufacturer and the buyer, the sealing test of the
sealing fittings may be carried out using a leak detector or other methods.
8.3 Sample test of accessories
The sample test of accessories shall be carried out in accordance with Chapter 11 of
GB/T 18890.1-2015 and meet the requirements.
8.4 Type test of accessories
The type tests and requirements of accessories shall comply with Chapter 12 and
Chapter 15 of GB/T 18890.1-2015.In addition, the following tests shall be carried out.
a) Sealing test after terminal assembly (see 8.4.1);
b) Thermomechanical performance test of conductor crimps and mechanical
connectors, if required by the buyer (see 8.4.2);
c) Additional test. outdoor termination rain power frequency voltage test, if
required by the buyer (see 8.4.3).
The accessories under test shall be assembled in accordance with the installation
instructions provided by the manufacturer and using the specified grade and quantity of
materials (including lubricants) provided by the manufacturer. See Appendix D for
general installation instructions.
The dimensions of the connection enclosure used in the electrical type test of gas-
immersed termination for GIS shall comply with Figure 3 or Figure 5 of IEC 62271-
209.2007.The size of the connection enclosure used in the electrical type test of the
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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