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

National Standard of the People's Republic of China

ICS

17.220.01

Classification

F 20

Issued by: State Administration for Market Regulation, China National Standardization Administration

Contents

• Foreword
• 1 Scope
• 2 Normative references
• 3 symbols and units
• 4 Example 1 - Mechanical effects of a single 10kV hard conductor arrangement
• 4.1 Overview
• 4.2 Data
• 4.3 Normal load. conductor stress and bearing force caused by static load
• 4.4 Special load. short circuit current effect
• 4.4.1 Maximum force of the central main conductor
• 4.4.2 Conductor stress and bearing force
• 4.5 Conclusion
• 5 Example 2 - Mechanical effects of multiple 10kV hard conductor arrangements
• 5.1 Overview
• 5.2 Data (added to the data in Study 1)
• 5.3 Normal load. conductor stress and bearing force caused by static load
• 5.4 Special load. short circuit current effect
• 5.4.1 Maximum force of the conductor
• 5.4.2 Conductor stress and bearing force
• 5.5 Conclusion
• 6 Example 3 - Mechanical effects of high voltage hard conductor arrangement
• 6.1 Overview
• 6.2 Data
• 6.3 Normal load. conductor stress and bearing force caused by static load
• 6.4 Special load. short circuit current effect
• 6.4.1 Maximum force of the central main conductor
• 6.4.2 Conductor stress and bearing force
• 6.4.3 Conclusion
• 7 Example 4 - Mechanical effects of 110kV loose wire arrangement
• 7.1 Overview
• 7.2 Data
• 7.3 Electromagnetic loads and characteristic parameters
• 7.4 Tension due to oscillation during short circuit Ft, d
• 7.5 Dynamic sag 22 in the conductor span
• 7.6 Tension caused by falling after short circuit Ff, d
• 7.7 Span horizontal displacement bh and minimum air clearance amin
• 7.8 Conclusion
• 8 Example 5 - Mechanical effects of tensioning wires
• 8.1 Overview
• 8.2 Public Data
• 8.3 Effective distance between sub-wires as=0.1m
• 8.3.1 Electromagnetic loads and characteristic parameters
• 8.3.2 Tension due to oscillation during short circuit Ft, d
• 8.3.3 Dynamic sag of a mid-span conductor
• 8.3.4 Tension caused by falling after short circuit Ff, d
• 8.3.5 Span horizontal displacement bh and minimum air clearance amin
• 8.3.6 Clamping force Fpi, d
• 8.3.7 Conclusion
• 8.4 The midline distance between the sub-wires is as=0.4m
• 8.4.1 Preface
• 8.4.2 Feature Size and Parameters
• 8.4.3 Clamping force Fpi, d
• 8.4.4 Conclusion
• 9 Example 6---Mechanical effect of tensile conductors with lead wires in the middle
• 9.1 Overview
• 9.2 Public Data
• 9.3 Leading plane 33 parallel to the main line
• 9.3.1 Overview
• 9.3.2 Current flows through the main line throughout the span
• 9.4 Leading wire plane 44 perpendicular to the main line
• 9.4.1 Overview
• 9.4.2 Current flows through the main line over the entire span
• 9.4.3 Current along half the length of the main conductor and the lead wire
• 10 Example 7---Mechanical effect of vertical main line (lead wire)
• 10.1 Overview
• 10.2 Data
• 10.3 Short circuit tension and maximum horizontal displacement
• 10.4 Clamping force
• 10.4.1 Static tension on lead wires
• 10.4.2 Feature Sizes and Parameters
• 10.4.3 Pinch force Fpi, d
• 10.5 Conclusion
• 11 Example 8 - Thermal effects of bare conductors
• 11.1 Overview
• 11.2 Data
• 11.3 Calculation
• 11.4 Conclusion
• References