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Zigzag Grounding Transformers

Zigzag Grounding Transformers In older 600V and lower systems, as well as in many existing higher voltage systems, the system neutral may not be available. To be able to ground these systems, Transformers can be used to create a neutral, which in turn can be connected to ground either directly, or more commonly, through a Neutral Grounding Resistor (NGR). These arrangements create what is commonly called an artificial neutral. The Zigzag Grounding transformer is a commonly used option. It is a three-phase, dry-type, air- cooled auto-transformer with no secondary winding. Each phase has two identical windings, which are wound in opposite directions to give the high impedance to normal phase currents.

transformers for use with Neutral Grounding Resistors (NGR) for installation indoors or outdoors onto a concrete pad or power transformer. Applicable Standards The transformer shall be designed, manufactured and tested as per the latest revisions of IEEE-32. Transformer The transformer shall be a three-phase, dry-type, air-

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