Overview: This document provides a detailed guide on the functional requirements and design considerations for substation earthing systems. It covers key aspects such as safety, equipment protection, and operational security, all while adhering to the latest industry standards and best practices. Key Highlights: - Defines important terminology and parameters related to substation earthing - Outlines the purpose, scope, and referenced documents for the earthing design - Specifies the functional requirements for an effective earthing system - Discusses the design requirements, including soil models, fault levels, and clearing times - Presents three case study variants for calculating and improving soil conductivity - Includes resources and further reading for deeper understanding Who Should Read This: - Electrical engineers responsible for substation design and earthing system integration - Project managers overseeing the planning and construction of new substations - Maintenance personnel tasked with evaluating and upgrading existing earthing systems - Researchers and academics studying advancements in substation grounding technology By providing a comprehensive, standards-based approach to substation earthing, this document serves as an invaluable reference for industry professionals seeking to ensure the safety, reliability, and compliance of their electrical infrastructure.
1. Definitions
2. Purpose
3. Scope
4. Referenced Documents
5. Functional Requirements
5.1 Design Requirements
5.2 Design Deliverables
5.3 Constructability Requirements
5.4 Operability Requirements
6. Case Studies applications
6.1 Calculation of Weighted Average Soil
Resistivity
6.2 Ground Grid Check Note
6.2.1 Variant 1: Sizing the Earth Grid
Based on Resistivity Value
6.2.2 Variant 2: Using Lowest Resistivity
from First Survey
6.2.3 Variant 3: Additive Method of
Improving Soil Conductivity
6.2.4 Conclusion
7. Resources and Further Reading
8. Author's Note an Acknowledgments
9. Index
10. Appendices
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