A. directly
B. through a resistor
C. through a reactor
D. Any of the above
Answer: D. Any of the above
Explanation:
Another name of neutral earthing is system earthing. In the neutral earthing system, the neutral of the system is connected to the ground
The advantages of neutral earthing are:
It can make a closed path
Elimination of arcing ground
The neutral of the power system may be connected to earth directly or through a resistor or reactor.
Solid grounding:
In this type of neutral grounding, the neutral of the system is directly connected to the ground through a conductor of negligible resistance and reactance.
Resistance grounding:
In this type of neutral grounding, the neutral of the system is connected to the ground through one or more resistance.
Resistance grounding limits the fault currents.
It protects the system from transient overvoltages
Reactance grounding:
In this method, a reactance is inserted between the neutral and ground to limit the fault current.
This method has high transient voltages appear under fault conditions