Can a Zig-Zag Transformer Provide a Neutral for 3-Phase HVAC Control Circuits?

In summary, the conversation discusses the issue of installing an HVAC system with only a 3-phase supply available, which means there is no neutral for the control circuitry. The possibility of using a "zig-zag" isolating transformer is mentioned, and the correct method of sizing the transformer and potential manufacturers are questioned. The conversation also includes a potential solution and the details of the project's available supply and control circuit. It is advised to seek the assistance of a licensed electrician for this project.
  • #1
halam
1
0
Hi

We have a project where we have to install an HVAC system but only a 3-phase supply is available. While that is fine for the motors inside the unit, it means that there is no neutral available for the control circuitry.

I am aware that a "zig-zag" isolating transformer can provide a neutral point in a 3 wire system but I have not used it before.

The control circuit will require approx 15A, what is the correct method of sizing the transformer, also is there any manufacturers out there that can provide this product?

Attached is a possible solution, as it mentions the zig-zag option. Would this fulfill the requirement?

Some details for our project:
Available supply: 3ph 400V (400A Breaker)
Control Circuit: 1ph 230V (24no 230V Contactors & 4no Siemens PLCs - Approx 15A)
 

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  • #2
halam said:
Hi

We have a project where we have to install an HVAC system but only a 3-phase supply is available. While that is fine for the motors inside the unit, it means that there is no neutral available for the control circuitry.

I am aware that a "zig-zag" isolating transformer can provide a neutral point in a 3 wire system but I have not used it before.

The control circuit will require approx 15A, what is the correct method of sizing the transformer, also is there any manufacturers out there that can provide this product?

Attached is a possible solution, as it mentions the zig-zag option. Would this fulfill the requirement?

Some details for our project:
Available supply: 3ph 400V (400A Breaker)
Control Circuit: 1ph 230V (24no 230V Contactors & 4no Siemens PLCs - Approx 15A)

Welcome to the PF.

You need to use a licensed electrician to help you with this project. We cannot help you here.
 

Related to Can a Zig-Zag Transformer Provide a Neutral for 3-Phase HVAC Control Circuits?

1. What is a 3 phase (Neutral) Transformer?

A 3 phase (Neutral) Transformer is a device that is used to transfer electrical energy between three different circuits through the use of electromagnetic induction. It consists of three sets of primary and secondary windings, with a neutral wire connected to the center of the windings.

2. How does a 3 phase (Neutral) Transformer work?

A 3 phase (Neutral) Transformer works by using the principle of electromagnetic induction. When an alternating current (AC) flows through the primary winding, it creates a magnetic field which then induces a current in the secondary winding. The neutral wire helps to balance out any uneven currents between the three phases.

3. What are the advantages of using a 3 phase (Neutral) Transformer?

The use of a 3 phase (Neutral) Transformer has several advantages, including a more efficient transfer of electrical energy, the ability to handle higher power loads, and a more balanced distribution of current between the three phases. It also allows for a greater range of voltage options and is more cost-effective compared to single-phase transformers.

4. What are the common applications of a 3 phase (Neutral) Transformer?

3 phase (Neutral) Transformers are commonly used in industrial and commercial settings for power distribution. They are also used in large appliances and equipment such as air conditioners, elevators, and pumps. In addition, they are used in renewable energy systems such as wind turbines and solar panels.

5. What are the safety precautions when working with a 3 phase (Neutral) Transformer?

When working with a 3 phase (Neutral) Transformer, it is important to follow safety precautions such as wearing appropriate protective gear, ensuring proper grounding, and avoiding contact with live wires. It is also important to regularly inspect and maintain the transformer to prevent any potential hazards or malfunctions.

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