Chinese Standard: 'GB/T 35698.22019'
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Calculation of effects of shortcircuit currents  Part 2: Examples of calculation

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Standard ID  GB/T 35698.22019 (GB/T35698.22019)  Description (Translated English)  Calculation of effects of shortcircuit currents  Part 2: Examples of calculation  Sector / Industry  National Standard (Recommended)  Classification of Chinese Standard  F20  Classification of International Standard  17.220.01  Word Count Estimation  66,655  Date of Issue  20190604  Date of Implementation  20200101  Drafting Organization  China Power Construction Group Beijing Survey and Design Institute Co., Ltd., China Electric Power Research Institute Co., Ltd.  Administrative Organization  National ShortCircuit Current Calculation Standardization Technical Committee (SAC/TC 424)  Regulation (derived from)  National Standard Announcement No. 7 of 2019  Proposing organization  China Electricity Council  Issuing agency(ies)  State Administration of Markets and China National Standardization Administration 
GB/T 35698.22019
Calculation of effects of shortcircuit currents  Part 2. Examples of calculation
ICS 17.220.01
F20
National Standards of People's Republic of China
Short circuit current effect calculation
Part 2. Examples
Part 2. Examplesofcalculation
(IEC TR608652.2015, ShortcircuitcurrentsCalculationofeffects
Part 2. Examplesofcalculation, IDT)
Published on.20190604
20200101 implementation
State market supervision and administration
China National Standardization Administration issued
Content
Foreword III
1 range 1
2 Normative references 1
3 symbols and units 1
4 Example 1  Mechanical effects of a single 10kV hard conductor arrangement 2
4.1 Overview 2
4.2 Data 2
4.3 Normal load. conductor stress and bearing force caused by static load 3
4.4 Special load. short circuit current effect 3
4.4.1 Maximum force of the central main conductor 3
4.4.2 Conductor stress and bearing force 4
4.5 Conclusion 6
5 Example 2  Mechanical effects of multiple 10kV hard conductor arrangements 6
5.1 Overview 6
5.2 Data (added to the data in Study 1) 7
5.3 Normal load. conductor stress and bearing force caused by static load 7
5.4 Special load. short circuit current effect 7
5.4.1 Maximum force of the conductor 7
5.4.2 Conductor stress and bearing force 8
5.5 Conclusion 11
6 Example 3  Mechanical effects of high voltage hard conductor arrangement 11
6.1 Overview 11
6.2 Data 12
6.3 Normal load. conductor stress and bearing force caused by static load 13
6.4 Special load. short circuit current effect 13
6.4.1 Maximum force of the central main conductor 13
6.4.2 Conductor stress and bearing force 13
6.4.3 Conclusion 18
7 Example 4  Mechanical effects of 110kV loose wire arrangement 19
7.1 Overview 19
7.2 Data 20
7.3 Electromagnetic loads and characteristic parameters 20
7.4 Tension due to oscillation during short circuit Ft, d 22
7.5 Dynamic sag 22 in the conductor span
7.6 Tension caused by falling after short circuit Ff, d 23
7.7 Span horizontal displacement bh and minimum air clearance amin 23
7.8 Conclusion 23
8 Example 5  Mechanical effects of tensioning wires 24
8.1 Overview 24
8.2 Public Data 24
8.3 Effective distance between subwires as=0.1m 25
8.3.1 Electromagnetic loads and characteristic parameters 25
8.3.2 Tension due to oscillation during short circuit Ft, d 27
8.3.3 Dynamic sag of a midspan conductor 27
8.3.4 Tension caused by falling after short circuit Ff, d 28
8.3.5 Span horizontal displacement bh and minimum air clearance amin 28
8.3.6 Clamping force Fpi, d 28
8.3.7 Conclusion 29
8.4 The midline distance between the subwires is as=0.4m 29
8.4.1 Preface 29
8.4.2 Feature Size and Parameters 29
8.4.3 Clamping force Fpi, d 30
8.4.4 Conclusion 31
9 Example 6Mechanical effect of tensile conductors with lead wires in the middle 31
9.1 Overview 31
9.2 Public Data 32
9.3 Leading plane 33 parallel to the main line
9.3.1 Overview 33
9.3.2 Current flows through the main line throughout the span 33
9.3.3 Current along the lead wire flows through the main line half span and flows out along the lead wire 39
9.4 Leading wire plane 44 perpendicular to the main line
9.4.1 Overview 44
9.4.2 Current flows through the main line over the entire span 45
9.4.3 Current along half the length of the main conductor and the lead wire 48
10 Example 7Mechanical effect of vertical main line (lead wire) 53
10.1 Overview 53
10.2 Data 54
10.3 Short circuit tension and maximum horizontal displacement 54
10.4 Clamping force 55
10.4.1 Static tension on lead wires 55
10.4.2 Feature Sizes and Parameters 55
10.4.3 Pinch force Fpi, d 56
10.5 Conclusion 57
11 Example 8  Thermal effects of bare conductors 57
11.1 Overview 57
11.2 Data 57
11.3 Calculation 57
11.4 Conclusion 58
References 59
Foreword
GB/T 35698 "Calculation of ShortCircuit Current Effect" is divided into two parts.
 Part 1. Definition and calculation methods;
 Part 2. Study.
This part is the second part of GB/T 35698.
This part uses the translation method equivalent to IEC TR608652.2015 "Shortcircuit current effect calculation part 2. example".
This section has made the following editorial changes.
 Modified the standard name.
Please note that some of the contents of this document may involve patents. The issuing organization of this document is not responsible for identifying these patents.
This part was proposed by the China Electricity Council.
This part is under the jurisdiction of the National ShortCircuit Current Calculation Standardization Technical Committee (SAC/TC424).
This section drafted by. China Power Construction Group Beijing Survey and Design Institute Co., Ltd., China Electric Power Research Institute Co., Ltd.
The main drafters of this section. Ouyang Mingjian, Wu Yuan, Wan Fengxia, Jiang Shude, Cai Ou, Li Linze, Zhuang Yufei, Bu Guangquan, Zhang Yantao,
Duan Xiangying, Shi Haobo, Zhang Yuhong.
Short circuit current effect calculation
Part 2. Examples
1 Scope
This part of GB/T 35698 is part of the technical report of GB/T 35698, mainly showing short circuit according to GB/T 35698.1
The application process of flow mechanical effects and thermal effects calculations. Therefore, this part is supplemented by GB/T 35698.1 and does not affect GB/T 35698.1.
Standardized calculation process.
Pay special attention to the following points.
a) This part of the study explains how to perform calculations in a concise and understandable manner in accordance with GB/T 35698.1, rather than for verifying computer programs.
b) The number in parentheses in the end of the formula refers to the formula number in GB/T 35698.12017.
c) The system voltage is the indicator voltage.
d) The calculation results retain three significant figures.
e) The short circuit effect appears as a special load and is attached to the mechanical load of the normal operation of the switchgear. So some of the following
In the case of hard conductors, the possible static initial loads were also calculated. For normal operating loads and shortcircuit loads,
Use a different safety factor. The values of these coefficients are typical values recommended for use. But depending on the safety concept adopted,
Other safety factors may be required.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 15544.12013 Threephase AC system shortcircuit current calculation Part 1. Current calculation (IEC 609090.2001,
IDT)
GB/T 35698.12017 Calculation of shortcircuit current effects  Part 1. Definitions and calculation methods (IEC 608651.2011, IDT)
3 symbols and units
Symbols and units refer to GB/T 35698.12017.
In addition to this, the following symbols are used.
Fstr,k static load (eigenvalue) N
Fstr,d static load (design value) N
Fst, r, d Hard conductor bearing force due to static load (design value) N
Hs, hI insulator, height of the support member m
The horizontal component of the Hs lead wire at the lower fixed point.
Ik Steadystate shortcircuit current (rms) according to GB/T 15544.1 A
Jst,m The second moment m4 of the main body section of the static load direction
Effective length of leff span m
Lf span shape factor m
Lh extension of the top support and clamp m
