1 Scope
This standard specifies the definitions, test methods, acceptance criteria, marking and packaging, and performance of housing and shed materials and core fittings of DC composite insulators (hereinafter referred to as "insulators").
This standard is applicable to the long rod composite insulators for ±500kV and above DC lines and converter stations, and DC long rod composite insulators of other voltage classes may refer to this standard, while line post insulator is beyond the application scope of this standard.
Ambient temperature at installation site of insulator generally is -40℃~+40℃.
Composite insulator specified in this standard refers to the one made by adopting high-temperature vulcanized silicon rubber on high-temperature resistant and acid-resistant core.
This standard excludes requirements about the selection of insulator according to specific operating conditions.
2 Normative References
The following standards contain provisions which, through reference in this standard, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections) to, or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition referred to apply.
GB 311.1 Insulation Co-ordination for High Voltage Transmission and Distribution Equipment (GB 311.1-1997, IEC 71-1:1993, NEQ)
GB/T 528 Rubber, Vulcanized or Thermoplastic - Determination of Tensile Stress-strain Properties (GB/T 528-2009, ISO 37:1994, IDT)
GB/T 529 Rubber, Vulcanized or Thermoplastic - Determination of Tear Strength (Trouser, Angle and Crescent Test Pieces) (GB/T 529-2008, ISO 34-1:1994, MOD)
GB/T 531.1-2008 Rubber Vulcanized or Thermoplastic - Determination of Indentation Hardness - Part 1: Duromerer Method (Shore Hardness) (GB/T 531.1-2008, ISO 7619-1:2004, IDT)
GB/T 775.2 Test Method for Insulators - Part 2: Electrical Test Methods
GB/T 1408.2 Electrical Strength of Insulating Materials - Test Methods - Part 2: Additional Requirements for Tests Using Direct Voltage
GB/T 1692-2008 Vulcanized Rubber - Determination of the Insulation Resistivity
GB/T 2900.5-2002 Electrotechnical Terminology - Insulating Solids, Liquids and Gases
GB/T 2900.8-2009 Electrotechnical Terminology - Insulators
GB/T 2900.19-1994 Electrotechnical Terminology - High-voltage Test Technique and Insulation Co-ordination
GB/T 4056-2008 Ball and Socket Coupling Dimensions of String Insulator Units (IEC 60120:1984, IDT)
GB/T 6553 Test Methods for Evaluating Resistance to Tracking and Erosion of Electrical Insulating Materials Used under Severe Ambient Conditions (GB/T 6553-2003, IEC 60587:1984, IDT)
GB/T 10707-2008 Rubber - Determination of the Burning
GB/T 16927.1 High-voltage Test Techniques - Part 1: General Definitions and Test Requirements (GB/T 16927.1-2011, IEC 60060-1:2010, MOD)
GB/T 16927.2-1997 High-voltage Test Techniques - Part 2: Measuring Systems
GB/T 18851.2-2008 Non-destructive Testing - Penetrant Testing - Part 2: Testing of Penetrant Materials (ISO 3452-2:2006, IDT)
GB/T 19519 Composite Insulators for a.c. Overhead Lines with A Nominal Voltage Greater than 1,000V- Definitions, Test Methods and Acceptance Criteria
GB/T 21421.1-2008 Composite String Insulator Units for Overhead Lines with A Nominal Voltage greater than 1,000V - Part 1: Standard Strength Classes and End Fittings
GB/T 22707-2008 Artificial Pollution Tests on High-voltage Insulators to Be Used on d.c. Systems (IEC/TR 61245:1993, MOD)
GB/T 24623-2009 Radio Interference Test on High-voltage Insulators
GB/T 25318-2010 Locking Devices for Ball and Socket Couplings of String Insulator Units: Dimensions and Tests
JB/T 11219.1-2011 End Fitting for Composite Insulator with A High Voltage Overhead Line - Part 1: End Fitting for String Insulator Units
3 Terms and Definitions
For the purposes of this document, the terms and definitions given in GB/T 2900.5, GB/T 2900.8 and GB/T 2900.19 and the following apply.
3.1
composite insulator
composite insulator is composed of at least two kinds of polymer insulating materials (i.e., core, and housing and sheds) and is also provided with end fitting
3.2
core
Foreword II
1 Scope
2 Normative References
3 Terms and Definitions
4 Marking
5 Test Classification
6 Design Test
7 Type Test
8 Sampling Test
9 Routine Test
Annex A (Normative) Typical Conditions of Hydrophobicity Classification (HC Value)
Annex B (Normative) Artificial Pollution Test Method - Solid-layer Method
Annex C (Normative) Multiple-factor Test
Annex D (Informative) Method for Dynamic Load Fatigue Test on Composite Insulator
