Grounding transformers are used to provide a ground path to either an ungrounded “Y” or delta connected system.Ê
Large multi-turbine wind farms often require Grounding transformers for fault protection on ungrounded lines. A Grounding transformer placed on the turbine string provides a ground path in the event the string becomes isolated from the system ground.Ê
Grounding transformers are typically constructed with either a Zig-Zag connected winding with or without an auxiliary winding or as a Wye connected winding with a Delta connected secondary.Ê
MGM Transformer is one of the leading Grounding Transformer Manufacturers in the United States. Please don’t hesitate to reach out for more information or a quote.Ê
PURPOSE
Simply put, a grounding transformer is used to provide a ground path to either an ungrounded ÒYÓ or a delta connected system and is used to:
1. Provide a relatively low impedance path to ground, thereby maintaining the
system neutral at or near ground potential.
2. Limit the magnitude of transient over voltages when re-striking ground faults
occur.
3. Provide a source of ground fault current during line to ground faults
4. Permit the connection of phase to neutral loads if desired
CONSTRUCTION
Grounding transformers are normally constructed either with (1) a Zig Zag (Zn) connected winding with or without an auxiliary winding or (2) as a Wye connected winding with a delta connected secondary that may or may not be used to supply auxiliary power.
SPECIFICATIONS REQUIRED
- Primary voltage
- Rated KVA or continuous primary phase current
- Continuous Neutral current
- Available neutral fault current and duration
- Impedance as a % or as an ohms/phase value
- Primary winding connection
- Secondary connection if applicable
- Basic overall construction features
- Neutral ground resisters if required
