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The advantages of Neutral earthing is
It can make a closed path
Elimination of arcing ground
Both
None of this
It can make a closed path
Neutral earthing provides a return path for fault currents in power systems, ensuring that protective devices like relays and circuit breakers can reliably detect and isolate faults. Without a neutral connection to the earth, a line-to-ground fault may not draw sufficient current to trip protection, leading to persistent abnormal voltages.
Neutral earthing provides a return path for fault currents in power systems, ensuring that protective devices like relays and circuit breakers can reliably detect and isolate faults. Without a neutral connection to the earth, a line-to-ground fault may not draw sufficient current to trip protection, leading to persistent abnormal voltages.
IfтАЛ=ZnтАЛ+ZsтАЛVphтАЛтАЛ тАФ where IfтАЛ is fault current, VphтАЛ is phase voltage, and ZnтАЛ is neutral impedance.
VneutralтАЛтЙИ0 тАФ ideal grounding condition where the neutral potential is clamped to earth potential.
When a fault occurs in an ungrounded system, the system capacitance to ground forms a circuit, leading to intermittent arcing. Neutral earthing directly connects the neutral point of transformers or generators to the earth, creating a low-impedance path. This ensures that the fault current flows through the earth back to the neutral, providing the necessary magnitude for protective relays to operate.
Neutral earthing stabilizes the potential of the phases with respect to the earth.
It prevents the occurrence of arcing grounds caused by floating neutral capacitance.
Essential for the effective operation of directional overcurrent and earth-fault protection relays.
Reduces the risk of overvoltage during line-to-ground faults.
Elimination of arcing grounds
Provides a closed path for fault current
Voltage stabilization during unbalanced loads
Improved safety for operating personnel
Increased risk of high short-circuit currents requiring stronger switchgear
Potential for increased interference with communication lines
Transmission systems for effective lightning protection
Distribution networks to allow earth fault detection
Option B (Elimination of arcing ground) is also a major advantage, but Option A is fundamentally why the protection scheme closes; in many textbook contexts, these are treated as combined benefits.
Ungrounded systems are prone to high-frequency transients known as 'arcing grounds' due to the charging and discharging of system capacitance.
A is correct тАФ Neutral earthing provides a stable, low-impedance closed path for fault currents to return to the source, which is critical for the reliable operation of protective relays.
In exams, always distinguish between Equipment Earthing (for safety against shock) and System/Neutral Earthing (for protection and stability of the electrical network).