Your browser does not support JavaScript

Zig Zag Grounding Transformer

Product Newsletter - December 19, 2017

Zig Zag Grounding Transformer

Today’s modern power systems require a solid ground reference to service single phase loads, protect personnel from undetected ground faults, and to assure that adequate ground fault current exists for proper ground fault relay operation.

Many utilities are now requiring renewable power providers to install grounding transformers at their tie point to grounded, ungrounded or undergrounded systems to assure an adequate ground reference.

At Elgin Power solutions we manufacture a wide variety of grounding transformers to service these needs. From large pad mounted 35 KV oil lled grounding transformers to smaller 480 Volt dry type, metal enclosed units we have your solution.

One of our more popular products is the “Zig-Zag” grounding transformer. This is a three phase transformer with a special winding that results in a reduced voltage across each set of coils. Consequently a “Zig-Zag” can be made smaller by a factor of the square root of three compared to a normal transformer. And as a result Zig Zag grounding transformers are more cost competitive than a normal delta/wye grounding transformer.

Zig Zags use three sets of 1:1 ratio transformer coils. The secondary set of winding of each pair is reverse wound. “A” secondary feeds “B” primary, “B” secondary feeds “C” primary and “C” secondary feeds “A” primary. The return side of all three primary coils is then tied to ground. As a result only zero sequence currents ow. Positive and negative sequence currents are blocked.

Zig Zag grounding transformers are used when there is only one voltage involved. A two winding delta/wye grounding transformer must be used if the secondary voltage winding is to be a lower voltage, or if the secondary is desired to be used for control or relaying.

Elgin’s state-of-the-art manufacturing facility is equipped with:

  • 5 modern coil winding machines operated by  experienced winders
  • Modern Insulation cutting machines & Core steel cutting machines
  • Our varnish dip tanks use sustained vacuum for maximum penetration.
  • Complete assemblies are baked to power factor in ovens to provide water resistance, proper insulation levels, and mechanical stability.
  • Extensive testing is done prior to release to assure the quality and reliable
We can supply indoor or outdoor Nema 3R compliant units built to ANSI C57.12.28 standards. Contact us with your speci cations and let us make you a solution.

Zig Zag Grounding Transformer

Zig Zag Grounding Transformer

Contact Elgin

Download Newsletter



Elgin Power Solutions




Copyright © 2020 All Rights Reserved. Elgin Power Solutions