This Guide was drafted according to the management requirements of the group standards of the Chinese Society of Electrical Engineering and the rules specified in "Directives for Standardization - Part 1: Structure and Drafting of Standards" (GB/T 1.1-2009).
Based on the design, R&D and experimental research achievements of high voltage lead exit for AC 1000kV transformer and reactor, this Guide takes its structural features into consideration.
The main technical contents of this Guide:
- the application scope was specified (see 1);
- the normative references were proposed (see 2);
- the applicable terms and definitions of this Guide were defined (see 3.1~3.11);
- the classification and selection principle of high voltage lead exit device for 1000kV transformer and reactor were formulated (see 4.1 and 4.2);
- the technical requirements for insulating cardboards and insulating parts of high voltage lead exit device for 1000kV transformer and reactor were proposed (see 5.1 and 5.2);
- the tests for insulating cardboards, insulating parts and lead exit devices were specified (see 6.1~6.3);
- the marking, packaging, transportation and storage of high voltage lead exit device for 1000kV transformer and reactor were specified (see 7.1~7.3).
Please note that some contents in this Guide may involve patents. The issuing authority of this Guide does not undertake the responsibilities to identify these patents.
This Guide was proposed by the Chinese Society of Electrical Engineering.
This Guide is under the jurisdiction of and explained by the Specialized Committee on High Voltage of Chinese Society of Electrical Engineering.
Drafting organizations of this Guide: State Grid Corporation of China, China Electric Power Research Institute, Taizhou Xinyuan Electrical Equipment Co., Ltd., Changzhou Yingzhong Electrical Co., Ltd.
Chief drafting staff of this Guide: Han Xiancai, Li Jinzhong, Sun Gang, Wang Xiaoning, Sun Jiantao, Gao Bulin, Liu Xueli, Yu Yingzhong, Lu Guoqing, Gao Fei, Cheng Huanchao, Zhang Shuqi, Feng Hua, Zhao Zhigang, Wu Chao, Qiu Yuzhou, Yu Xinru, Wang Jianyi, Tang Hao, Wang Ke, Guo Rui, Zhao Xiaoyu, Guan Jianxin, Jia Pengfei, Shen Zejun.
This Guide hereby was initially issued.
During the process of implementing this Guide, any opinion or suggestion shall be fed back to the Standard Executive Office of the Chinese Society of Electrical Engineering.
PROFESSIONAL STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
中国电机工程学会标准
T/CSEE 0002-2015
Guide for the Selection of High Voltage Lead Exit for 1000kV Transformer and Reactor
1000kV变压器/电抗器用高压出线装置选用导则
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.
5.1.2 Appearance requirements
5.1.2.1 The basic product dimension tolerance (in length and width direction) shall be controlled in ±10mm.
5.1.2.2 The surface shall be even and free from visible layering, cracks, pollution spots, bubbles and holes, etc.; technology overlapping curves are allowed.
5.1.3 Performance requirements
The performance of insulating cardboard shall be in accordance with those specified in Table 1 and GB/T 19264.1.
Table 1 Performance Requirements and Test Methods for Insulating Cardboard
No. Performance Requirements Test method
Item Cardboard thickness d
mm
1 Thickness deviation
(maximum deviation of individual measured value from nominal value) % ≤1.6 ±7.5 GB/T 19264.2-2013
1.63.0 ±4.0
2 Tightness (apparent density)
g/cm3 ≤1.6 1.00~1.20 GB/T 19264.2-2013
1.66.0 1.15~1.30
3 Tensile strength
MPa Longitudinal ≤1.6 ≥105 GB/T 19264.2-2013
1.66.0 ≥115
Horizontal ≤1.6 ≥80 GB/T 19264.2-2013
1.66.0 ≥90
4 Elongation rate
% Longitudinal - ≥3.0 GB/T 19264.2-2013
Horizontal - ≥4.0
5 Compressibility C
% ≤1.6 ≤10.0 GB/T 19264.2-2013
1.66.0 ≤4.0
6 Compressed recovery part Crev
% ≤1.6 ≥45 GB/T 19264.2-2013
1.66.0 ≥50
7 Shrinkage rate
% Longitudinal - ≤0.4 GB/T 19264.2-2013
Horizontal ≤0.5
Thickness ≤4.0
8 Interlayer cohesiveness - Stripping to make one layer or multilayer crack and have obvious roughness or hairy. GB/T 19264.2-2013
9 Moisture content % - ≤6 GB/T 19264.2-2013
10 Ash content % - ≤0.5 GB/T 19264.2-2013
11 Conductivity of aqueous extract
mS/m ≤1.6 ≤4.0 GB/T 19264.2-2013
1.66.0 ≤8.0
12 Aqueous extract pH value - 6~9 GB/T 19264.2-2013
13 Oil absorbency
% ≤1.6 ≥11 GB/T 19264.2-2013
1.66.0 ≥7
14 X-ray metallics inspection a
Pcs./dm2 - Without visible particle GB/T 19264.2-2013 a
15 Electrical strength
kV/mm In air - ≥12 GB/T 19264.2-2013
In oil ≤1.6 ≥45
1.66.0 ≥35
16 Volume resistivity b
Ω·m In air - ≥1.0×1012 GB/T 1410-2006 b
In oil ≥1.0×1013
17 Surface resistivity b
Ω In air - ≥1.0×1013
In oil ≥1.0×1014
18 Polymerization degree - ≥1200 GB/T 1548-2004
a The resolution of X-ray machine shall be greater than or equal 48Lp/cm.
b It is not required to remove overlapping curve from the test sample or stick with electrode materials; the drying process and oil impregnation under vacuum are same as Item 15 "electrical strength".
5.2 Requirements of insulating parts for lead exit device
5.2.1 Raw materials
5.2.1.1 Insulating parts shall be made of 100% unbleached sulfate softwood pulp and free from any impurity that may influence the electrical property.
5.2.1.2 The production water shall be purified water and free from any impurity that may influence the electrical property.
5.2.1.3 The adhesive used in insulating parts shall be provided with strong adhesive force, heat resistance and aging resistance; the property index of bonded product shall meet the requirements specified in Table 2. Adhesives shall have good compatibility with transformer oils.
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
