Why is grounding important in the design of a substation? 

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SSC JE Electrical 4 Dec 2023 Official Paper II
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  1. To ensure room for expansion due to load growth  
  2. To protect passers-by during a short circuit in the transmission system 
  3. To protect against environmental effects 
  4. To facilitate access for maintenance 

Answer (Detailed Solution Below)

Option 2 : To protect passers-by during a short circuit in the transmission system 
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Detailed Solution

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Explanation:

The primary reason grounding is important in the design of a substation is: To protect passers-by during a short circuit in the transmission system

  • Grounding is crucial for safety in electrical systems. During a short circuit or fault in the transmission system, proper grounding helps to divert excessive fault currents to the ground, reducing the risk of electric shock and protecting people and equipment.
  • Grounding also helps in maintaining the system's voltage stability, minimizing electromagnetic interference, and providing a reference point for system operation.
  • While other options like facilitating access for maintenance and protecting against environmental effects are considerations in substation design, ensuring safety during faults is a primary concern addressed by proper grounding.
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