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Grounding is done generally at
Receiving end
Supply end
Either at receiving end or at a supply end
None of above
Supply end
Neutral grounding refers to the intentional connection of the system neutral to the earth at the supply end (e.g., at the transformer or generator star point). This practice fixes the neutral potential to ground and provides a defined return path for zero-sequence currents during fault conditions.
Neutral grounding refers to the intentional connection of the system neutral to the earth at the supply end (e.g., at the transformer or generator star point). This practice fixes the neutral potential to ground and provides a defined return path for zero-sequence currents during fault conditions.
VphaseтАЛ=3тАЛVlineтАЛтАЛ тАФ Relation between phase and line voltage in star system
IfтАЛ=ZnтАЛVphтАЛтАЛ тАФ Fault current magnitude calculation involving grounding impedance ZnтАЛ
In a star-connected system, the neutral point is the common junction. By connecting this point to the ground, the system voltage relative to earth is stabilized. During a line-to-ground fault, the grounding path allows fault current to flow, which can be detected by protective relays to isolate the faulty section.
Grounding stabilizes the voltage levels relative to the ground.
It prevents the creation of excessive potential differences between phases and earth.
It facilitates the operation of protective equipment by providing a path for fault currents.
Grounding is essential for equipment insulation coordination.
Protection against arcing grounds
Improved safety for personnel and equipment
Simplified earth fault detection
High magnitude of fault current compared to ungrounded systems
Increased interference with neighboring communication lines
Power transmission systems
Distribution transformers
Industrial motor drives
In industrial and utility systems, the transformer or generator star point is the designated 'supply end' for grounding.
Option A is incorrect because the receiving end equipment usually relies on local equipment earthing rather than system neutral grounding.
B is correct тАФ Neutral grounding is performed at the supply end (generator or transformer star point) to provide a firm reference for system potential.
Always distinguish between 'System Grounding' (neutral point to ground) and 'Equipment Grounding' (metal chassis to ground) as they serve different safety purposes.