A. Improve neutral wire’s current capacity
B. Avoid overheating of the transformer
C. Provide artificial earthing
D. Avoid harmonics
Answer: C. Provide artificial earthing
Explanation:
The grounding transformer is used to provide a path to an ungrounded system or when the system neutral is not available. Thus, it provides artificial earthing.
It provides a low impedance path to the neutral and limits the transient overvoltage when the ground faults occur in the system.
The grounding of the system can be done by using a delta-star grounding transformer or by using a zig-zag grounding transformer.
Grounding transformers are typically used to Provide a relatively low-impedance path to ground, thereby maintaining the system neutral at or near ground potential.
Limit the magnitude of transient overvoltages when restriking ground faults occur. Provide a source of ground fault current during line-to-ground faults.