Power cables with cross-linked polyethylene insulation and their accessories for rated voltage of 220 kV(Um=252 kV)―Part 1:Test methods and requirements
1 Scope
This part of GB/T 18890 specifies test methods and requirements for power cable systems and cables with cross-linked polyethylene insulation and their accessories for rated voltages of 220kV (Um=252kV) by fixed installations.
This part applies to single-core cables and to their accessories for usual conditions of installation and operation, but not to cables and their accessories under special conditions, such as submarine cables, for which modifications to the standard tests may be necessary or special test conditions may need to be devised.
This part does not cover transition joints between cables with cross-linked polyethylene insulation and paper insulated cables.
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 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 (IEC 60811-1-1:2001, IDT)
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 (IEC 60811-1-2:1985, IDT)
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 (IEC 60811-1-4:1985, IDT)
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 (IEC 60811-2-1:2001, IDT)
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 (IEC 60811-3-1:1985, IDT)
GB/T 2951.32-2008 Common Test Methods for Insulating and Sheathing Materials of Electric and Optical Cables - Part 32: Methods Specific to PVC Compounds - Loss of Mass Test - Thermal Stability Test (IEC 60811-3-2:1985, IDT)
GB/T 2951.41-2008 Common Test Methods for Insulating and Sheathing Materials of Electric and Optical Cables - Part 41: Methods Specific to Polyethylene and Polypropylene Compounds - Resistance to Environmental Stress Cracking - Measurement of the Melt Flow Index - Carbon Black and/or Mineral Filler Content Measurement in Polyethylene by Direct Combustion - Measurement of Carbon Black Content by Thermo Gravimetric Analysis (TGA) - Assessment of Carbon Black Dispersion in Polyethylene Using a Microscope (IEC 60811-4-1:2004, IDT)
GB/T 3048.12 Test Methods for Electrical Properties of Electric Cables and Wires - Part 12: Partial Discharge Test (GB/T 3048.12-2007, IEC 60885-3:1988, Electrical Test Methods for Electric Cables - Part 3: Test Methods for Partial Discharge Measurements on Lengths of Extruded Power Cables, MOD)
GB/T 3048.13 Test Methods for Electrical Properties of Electric Cables and Wires - Part 13: Impulse Voltage Test (GB/T 3048.13-2007, IEC 60230:1966, Impulse Tests on Cables and Accessories, IEC 60060-1:1989, High-voltage Test Techniques - Part 1: General Definitions and Test Requirements, MOD)
GB/T 3956 Conductors of Insulated Cables (GB/T 3956-2008, IEC 60228:2004, IDT)
GB/T 16927.1 High-voltage Test Techniques - Part 1: General Definitions and Test Requirements (GB/T 16927.1-2011, IEC 60060-1:2006, High-voltage Test Techniques - Part 1: General Definitions and Test Requirements, MOD)
GB/T 18380.12 Test on Electric and Optical Fibre 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 18380.12-2008, IEC 60332-1-2:2004, IDT)
JB/T 10181.11-2014 Calculation of Cable Carrying Capacity - Part 11: General Requirements for Current-carrying Capacity Formula (100% Load Factor) and Loss Calculation (IEC 60287-1-1:2006, IDT)
JB/T 10696.5-2007 Test Methods for Determining Mechanical Physical and Chemical Properties of Electric Cables and Wires - Part 5: Corrosion Spread Test
JB/T 10696.6-2007 Test Methods for Determining Mechanical Physical and Chemical Properties of Electric Cables and Wires - Part 6: Test for Abrasion of Oversheaths
IEC 60183 Guidance for the Selection of High-voltage a.c. Cable Systems
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 following terms and definitions apply.
3.1 Definitions of dimensional values (thicknesses, cross-sections, etc.)
3.1.1
nominal value
value by which a quantity is designated and which is often used in tables
Note: Usually, in this part, nominal values give rise to values to be checked by measurements taking into account specified tolerances.
3.1.2
median value
when several test results have been obtained and ordered in an increasing (or decreasing) succession, middle value if the number of available values is odd, and mean of the two middle values if the number is even
3.2 Definitions concerning tests
3.2.1
routine test
tests made by the manufacturer on each manufactured component (length of cable or accessory) to check whether the component meets the specified requirements
3.2.2
sample test
tests made by the manufacturer on samples of complete cable, or components taken from a complete cable or accessory, at a specified frequency, so as to verify that whether the finished product meets the specified requirements
Foreword i
1 Scope
2 Normative References
3 Terms and Definitions
4 Voltage Designations and Materials
5 Precautions Against Water Penetration in Cables
6 Cable Characteristics
7 Accessory Characteristics
8 Test Conditions
9 Routine Tests on Cables and on the Main Insulation of Prefabricated Accessories
10 Sample Tests on Cables
11 Sample Tests on Accessories
12 Type Tests on Cable Systems
13 Prequalification Test of the Cable System
14 Type Test on Cables
15 Type Test on Accessories
16 Electrical Test after Installation
Annex A (Informative) Determination of the Cable Conductor Temperature
Annex B (Normative) Rounding of Numbers
Annex C (Informative) List of Type and Prequalification and Extension of Prequalification Tests of Cable Systems
Annex D (Normative) Method of Measuring Resistivity of Semi-conducting Screens
Annex E (Normative) Water Penetration Test
Annex F (Normative) Tests on Components of Cables with a Longitudinally Applied Metal Tape or Foil, Bonded to the Oversheath
Annex G (Normative) Tests of Outer Protection for Joints
Annex H (Normative) Test of Micropore, Impurity and Semi-conductive Screen Interface Protrusion
Annex I (Informative) Structural Changes of This Part in Respect with IEC 62067:
Annex J (Informative) Technical Differences Between This Part and IEC 62067:2011 and Their Reasons
Bibliography
