ZIG ZAG TRANSFORMERS
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For Neutral Grounding and Custom Applications
Since 1983, Acutran Transformers has been designing and manufacturing Zigzag transformers in either individual transformers or in neutral grounding systems.
What is a Zig Zag Transformer?
A zigzag transformer is a special-purpose three phase transformer with a zigzag or "interconnected star" winding connection. Zigzag transformers are used to create the missing ground in an ungrounded 3-phase system by providing a path for the neutral to ground.
Throughout the USA, many utility companies are requiring renewable power providers (Wind, Solar, Hydro) to install grounding transformers at their tie point to grounded, ungrounded or undergrounded systems to provide a ground reference.
The best way to resistance ground a power system is to obtain the system neutral through a generator or transformer with a wye-connected winding. However, a system neutral may not be available, particularly in many older low voltage systems and a significant number of existing medium voltage systems. To avoid the high cost of replacing a source transformer, an existing delta-connected system can be grounded using a zigzag transformer to form an artificial neutral, then connecting a resistor between the newly created wye-point and ground.
In delta connected transformer, a zero sequence (i.e. an unbalanced current during the fault) is unavailable and therefore components are not protected which result in additional stress and increased heat on the system. Acutran’s zig zag transformer built with high end 3M Thermavolt insulation, copper conductors and superior core steel provides a neutral during the ground fault.
Acutran’s zig zag transformer are designed to offer a low impedance, creating a path for zero sequence components under fault conditions and prevents system voltage rise in the unfaulted phases which makes a zigzag transformer a very good earthing transformer. In the event that the current has to be limited during the fault condition, a suitable neutral grounding resistor (add link to Acutran Neutral Grounding Resistor) can be added to the system.
Acutran Neutral Grounding Systems (single or three phase) can we combined with neutral ground fault relays and current transformers to automatic create an open circuit during the fault condition is the system can not automatically correct itself.
-
For Neutral Grounding and Custom Applications
Since 1983, Acutran Transformers has been designing and manufacturing Zigzag transformers in either individual transformers or in neutral grounding systems.
What is a Zig Zag Transformer?
A zigzag transformer is a special-purpose three phase transformer with a zigzag or "interconnected star" winding connection. Zigzag transformers are used to create the missing ground in an ungrounded 3-phase system by providing a path for the neutral to ground.
Throughout the USA, many utility companies are requiring renewable power providers (Wind, Solar, Hydro) to install grounding transformers at their tie point to grounded, ungrounded or undergrounded systems to provide a ground reference.
The best way to resistance ground a power system is to obtain the system neutral through a generator or transformer with a wye-connected winding. However, a system neutral may not be available, particularly in many older low voltage systems and a significant number of existing medium voltage systems. To avoid the high cost of replacing a source transformer, an existing delta-connected system can be grounded using a zigzag transformer to form an artificial neutral, then connecting a resistor between the newly created wye-point and ground.
In delta connected transformer, a zero sequence (i.e. an unbalanced current during the fault) is unavailable and therefore components are not protected which result in additional stress and increased heat on the system. Acutran’s zig zag transformer built with high end 3M Thermavolt insulation, copper conductors and superior core steel provides a neutral during the ground fault.
Acutran’s zig zag transformer are designed to offer a low impedance, creating a path for zero sequence components under fault conditions and prevents system voltage rise in the unfaulted phases which makes a zigzag transformer a very good earthing transformer. In the event that the current has to be limited during the fault condition, a suitable neutral grounding resistor (add link to Acutran Neutral Grounding Resistor) can be added to the system.
Acutran Neutral Grounding Systems (single or three phase) can we combined with neutral ground fault relays and current transformers to automatic create an open circuit during the fault condition is the system can not automatically correct itself.
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