GB/T 31489.4-2020 English PDF (GBT31489.4-2020)

Delivery: 3 seconds. Download true-PDF + Invoice.
Get QUOTATION in 1-minute: Click GB/T 31489.4-2020
Historical versions: GB/T 31489.4-2020
Preview True-PDF (Reload/Scroll if blank)

GB/T 31489.4-2020: D. C. extruded cables systems for power transmission at a rated voltage up to and including 500 kV--Part 4: Accessories for D. C. cables
GB/T 31489.4-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.060.20
K 13
D.C. Extruded Cables Systems for Power Transmission at a
Rated Voltage up to and Including 500 kV - Part 4:
Accessories for D.C. Cables
ISSUED ON: DECEMBER 14, 2020
IMPLEMENTED ON: JULY 1, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms, Definitions and Symbols ... 6
4 Service Characteristics ... 7
5 Product Naming ... 8
6 Technical Requirements ... 10
7 Marking of Accessories ... 15
8 Tests of Accessories ... 15
9 Acceptance Inspection Rules ... 19
10 Packaging, transportation and Storage ... 20
Appendix A (informative) Properties of Silicone Oil ... 21
Appendix B (normative) Test Requirements and Methods ... 22
Bibliography ... 24
D.C. Extruded Cables Systems for Power Transmission at a
Rated Voltage up to and Including 500 kV - Part 4:
Accessories for D.C. Cables
1 Scope
This Part of GB/T 31489 specifies the service characteristics, product naming, technical
requirements, accessories marking, accessories test, acceptance inspection rules, packaging,
transportation and storage of XLPE insulated power cable accessories for power transmission
at a rated voltage up to and including 500 kV.
This Part is applicable to the terminations and joints of XLPE insulated DC land cables and DC
submarine cables for power transmission at a rated voltage up to and including 500 kV.
2 Normative References
The following documents are indispensable to the application of this document. In terms of
references with a specified date, only versions with a specified date are applicable to this
document. In terms of references without a specified date, the latest version (including all the
modifications) is applicable to this document.
GB/T 311.1-2012 Insulation Co-ordination - Part 1: Definitions, Principles and Rules
GB/T 1527 Drawn Tube of Copper and Copper Alloys
GB/T 2900.10-2013 Electrotechnical Terminology - Electric Cables
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 3048.8 Test Methods for Electrical Properties of Electric Cables and Wires - Part 8: AC
Voltage Test
GB/T 3048.12 Test Methods for Electrical Properties of Electric Cables and Wires - Part 12:
Partial Discharge Test
GB/T 3048.13 Test Methods for Electrical Properties of Electric Cables and Wires - Part 13:
Impulse Voltage Test
GB/T 3048.14 Test Methods for Electrical Properties of Electric Cables and Wires - Part 14:
DC Voltage Test
GB/T 4423 Copper and Copper Alloy Cold-drawn Rod and Bar
GB/T 4909.3 Test Methods for Bare Wires - Part 3: Tensile Test
GB/T 8287.1 Indoor and Outdoor Post Insulators for Systems with Nominal Voltage greater
than 1,000 V - Part 1: Test on Insulators of Ceramic Material or Glass
GB/T 11017.1-2014 Power Cables with Cross-linked Polyethylene Insulation and Their
Accessories for Rated Voltage of 110 kV (Um = 126 kV) - Part 1: Test Methods and
Requirements
GB/T 12464 Wooden Boxes
GB/T 16927.1 High-voltage Test Techniques - Part 1: General Definitions and Test
Requirements
GB/T 20878 Stainless and Heat-resisting Steels - Designation and Chemical Composition
GB/T 21429 Composite Insulators - Hollow Insulators for Use in Outdoor and Indoor Electrical
Equipment - Definitions, Test Methods, Acceptance Criteria and Design Recommendations
GB/T 23752 Hollow Pressurized and Unpressurized Ceramic and Glass Insulators for Use in
Electrical Equipment with Rated Voltages greater than 1,000 V
GB/T 26218.1 Selection and Dimensioning of High-voltage Insulators Intended for Use in
Polluted Conditions - Part 1: Definitions, Information and General Principles
GB/T 31489.1-2015 D.C. Extruded Cable Systems for Power Transmission at a Rated Voltage
up to and Including 500 kV - Part 1: Test Methods and Requirements
GB/T 31489.2-2020 D.C. Extruded Cable Systems for Power Transmission at a Rated Voltage
up to and Including 500 kV - Part 2: D.C. Land Cables
GB/T 31489.3-2020 D.C. Extruded Cable Systems for Power Transmission at a Rated Voltage
up to and Including 500 kV - Part 3: D.C. Submarine Cables
YD/T 814.3 Closure for Optical Fiber Cables - Part 3: Closure for Shallow Water Submarine
Optical Fiber Cables
YD/T 814.5 Closure for Optical Fiber Cables - Part 5: Closure for Deep Water Submarine
Optical Fiber Cables
IEC 60840:2020 Power Cables with Extruded Insulation and Their Accessories for Rated
Voltages above 30 kV (Um = 36 kV) up to 150 kV (Um = 170 kV) - Test Methods and
Requirements
IEC 62067:2011 Power Cables with Extruded Insulation and Their Accessories for Rated
Voltages above 150 kV (Um = 170 kV) up to 500 kV (Um = 550 kV) - Test Methods and
The following symbols are applicable to this document.
U0: the rated DC voltage between the conductor and the shield for which the cable system is
designed.
UP2,S: when the operating impulse voltage has the same polarity as the actual DC voltage, 1.15
times the maximum absolute peak value of the operating impulse voltage that the cable system
may withstand.
UP2,O: when the operating impulse voltage is opposite in polarity to the actual DC voltage, 1.15
times the maximum absolute peak value of the operating impulse voltage that the cable system
may withstand.
UP1: when the lightning impulse voltage is opposite in polarity to the actual DC voltage, 1.15
times the maximum absolute peak value of the lightning impulse voltage that the cable system
may withstand.
4 Service Characteristics
4.1 Rated Voltage and Operating Temperature
The land cable accessories shall comply with the stipulations of Chapter 4 in GB/T 31489.2-
2020; the submarine cable accessories shall comply with the stipulations of Chapter 4 in GB/T
31489.3-2020.
4.2 Environmental Conditions (applicable to outdoor termination)
4.2.1 Temperature and altitude
4.2.1.1 Normal operating conditions
The normal operating conditions are as follows:
a) The maximum air temperature of the surrounding environment does not exceed 40 C;
b) The altitude of the installation site does not exceed 1,000 m.
4.2.1.2 Temperature correction of test voltage value
For equipment where the air temperature of the surrounding environment is higher than 40 C,
the test voltage of the outer insulation in a dry state shall be multiplied by the temperature
correction factor Kt, as shown in Formula (1).
Where,
Kt---the temperature correction factor;
The conductor connecting rod shall be made of copper material conforming to GB/T 4423, and
shall be annealed.
The conductor connecting pipe shall be made of copper material conforming to GB/T 1527.
The copper content of the crimp-type conductor connecting pipe shall not be lower than 99.90%,
and shall be annealed.
The connecting terminals shall be made of copper or copper alloy with good electrical
conductivity. See IEC/TR 62271-301 or user requirements for the dimensions.
NOTE: aluminum connection fittings are under consideration.
The surface of the conductor connecting rod and the conductor connecting pipe shall be smooth
and clean, and there shall be no damages, burrs, concave-convex marks and other defects
affecting electrica...