Limit the magnitude of transient overvoltages when restriking ground faults occur. Provide a source of ground-fault current during line-to-ground faults.
Earthing transformer is an auxiliary transformer and a part of an electrical earthing system, which is used to provide a neutral connection for earthing to a power system where the neutral connections are unavailable.
Earthing transformer is generally used in a power system is delta connected.
It provides a low impedance path to the neutral and also limits the transient overvoltage when the ground faults occur in the system.
The earthing transformer can be used to create a neutral point for a network.
ZN (Zig-Zag-Neutral) connection is usually applied.
Z connection provides linear and specified zero sequence impedance.
YN+d can also be applied.
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 used to provide a ground path to either an ungrounded “Y” or delta-connected system.
Large multi-turbine wind farms often require Grounding transformers for fault protection on ungrounded lines.
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