Neutral Grounding Transformers
Up to 350 MVA Fault Rating with Voltages to 69 kV (350 BIL)
Niagara Transformer has extensive experience in the design and manufacture of specialty grounding auto transformers. These types of transformers provide a neutral point for grounding purposes. Applications may call for a single grounding source, multiple generators on a common bus, or a single generator where fault limitation is desired.
Windings in auto transformers consist of six equal parts, each designed for 1/3 line-to-line voltage. If there is a ground fault on any line, the ground current flows equally through the three legs of an auto transformer, and the interconnection offers minimum impedance to the single-phase fault current.
To ensure auto transformers are capable of withstanding continuous exposure to the dynamic forces of short circuit currents, Niagara Transformer employs an epoxy-dip to liquid-filled auto transformers and epoxy end-cap inserts on dry-type auto transformers.
