1 Scope
This Guide specifies the terms and definitions, classification and selection principle, technical requirements, test rules, marking, packaging, transportation and storage of high voltage lead exit for AC 1000kV transformer and reactor.
This Guide is applicable to the lead exit of AC 1000kV oil-immersed power transformer and reactor; the lead exit of transformer and reactor of other voltage classes may also refer to the provisions of this Guide.
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 1410 Methods of Test for Volume Resistivity and Surface Resistivity of Solid Insulating Materials
GB/T 1548-2004 Pulps - Determination of Viscosity
GB/T 2900.5 Electrotechnical Terminology - Electrical Insulating Solids, Liquids and Gases
GB/T 19264.1 Pressboard and Presspaper for Electrical Purposes - Part 1: Definitions and General Requirements
GB/T 19264.2-2013 Pressboard and Presspaper for Electrical Purposes - Part 2: Methods of Test
GB/T 19264.3 Pressboard and Presspaper for Electrical Purposes - Part 3: Requirements for Pressboard
JB/T 8318 Technical Specifications of Insulation-shaping Components for Transformer
IEC 60763-2:2007 Specification for Laminated Pressboard - Part 2: Methods of Test
3 Terms and Definitions
For the purpose of this Guide, the following terms and definitions and those established in GB/T 2900.5 and GB/T 19264.1 apply. For the convenience of application, some terms and definitions in GB/T 2900.5 and GB/T 19264.1 are re-listed below.
3.1
Thermal aging test
The test for the purpose of evaluating the thermal aging life of insulating materials by exposing the insulating materials in the temperature higher than the expected working temperature, taking heat as main aging factor and determining the change of certain property with time.
3.2
Mechanical aging test
The test for the purpose of evaluating the mechanical aging life of insulating materials by exposing the test sample in mechanical stress strengthened in certain form or with increased acting frequency and determining the change of certain property with time.
3.3
Electrical aging test
The test for the purpose of evaluating the electrical aging life of insulating materials by exposing the test sample in the electric field of increased strength or frequency and determining the change of certain property with time.
4 Classification and Selection Principle
4.1 Classification
The high voltage (HV) lead exit device for extra HV transformer may be classified into indirect middle lead exit structure, direct middle lead exit structure and direct ending lead exit structure.
4.2 Selection principle
HV winding of large capacity transformer adopts indirect HV middle lead exit structure. Under allowable transportation conditions, direct middle lead exit structure should be adopted. HV winding is inner winding or the EHV transformer of small capacity, as well as shunt reactor and may adopt the direct ending lead exit structure.
5 Technical Requirements
5.1 Requirements of insulating cardboard for lead exit device
5.1.1 Raw materials requirements
5.1.1.1 100% unbleached sulfate softwood pulp may be used as raw material.
5.1.1.2 Production water shall be purified water.
Foreword i
1 Scope
2 Normative References
3 Terms and Definitions
4 Classification and Selection Principle
5 Technical Requirements
6 Test
7 Marking, Packaging, Transportation and Storage
