GB/T 35698.2-2019 English PDF

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GB/T 35698.2-2019: Calculation of effects of short-circuit currents -- Part 2: Examples of calculation
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GB/T 36278   GB/T 36050   GB/T 33592   GB/T 28583   GB/T 35681   GB/T 35698.1   

Basic data

Standard ID: GB/T 35698.2-2019 (GB/T35698.2-2019)
Description (Translated English): Calculation of effects of short-circuit 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: 66,683
Date of Issue: 2019-06-04
Date of Implementation: 2020-01-01
Quoted Standard: GB/T 15544.1-2013; GB/T 35698.1-2017
Adopted Standard: IEC/TR 60865-2-2015, IDT
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration
Summary: This standard specifies the following points: a) The calculation examples of this standard illustrate how to perform calculations in a concise and understandable manner according to GB/T 35698.1, rather than for verifying computer programs. b) The numbers in brackets at the end of the formula refer to the formula number in GB/T 35698.1-2017. c) The system voltage coefficient refers to the nominal voltage. d) The calculation results are kept with three significant figures. e) Short circuit effect

GB/T 35698.2-2019: Calculation of effects of short-circuit currents -- Part 2: Examples of calculation

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Calculation of effects of short-circuit 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 TR60865-2.2015, Short-circuitcurrents-Calculationofeffects- Part 2. Examplesofcalculation, IDT) Published on.2019-06-04 2020-01-01 implementation State market supervision and administration China National Standardization Administration issued

Content

Foreword III 1 Scope 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 sub-wires 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 mid-span 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 sub-wires 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 6---Mechanical 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 7---Mechanical 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 Short-Circuit 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 TR60865-2.2015 "Short-circuit 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 Short-Circuit 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 35698.1-2017. 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 short-circuit 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 15544.1-2013 Three-phase AC system short-circuit current calculation Part 1. Current calculation (IEC 60909-0.2001, IDT) GB/T 35698.1-2017 Calculation of short-circuit current effects - Part 1. Definitions and calculation methods (IEC 60865-1.2011, IDT)

3 symbols and units

Symbols and units refer to GB/T 35698.1-2017. 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 Steady-state short-circuit 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 ......

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