# Polarity of 3p core transformer

• Amith Menon
In summary, the purpose of a 3p core transformer is to convert electrical energy between voltage levels. Its performance is affected by the polarity, which determines the direction of induced voltage. Positive polarity means the induced voltage flows in the same direction as the primary voltage, while negative polarity means it flows in the opposite direction. The polarity is determined by the way the windings are connected and can be changed by rewiring, but this should only be done by a trained professional.
Amith Menon
I have a 380V,3 phase core type transformer which is being used as AC line choke in the incomer of a VFD.As we are using only the inductance property of the transformer,I was just wondering whether we could connect R phase of the supply to any winding and then follow the phase sequence accordingly.

Welcome to the PF.
Yes. The only important thing is to make sure that the three windings are consistent and that one is not swapped end for end. For balanced phase currents, the shared core should have a sum zero field.

## 1. What is the purpose of a 3p core transformer?

The purpose of a 3p core transformer is to convert electrical energy from one voltage level to another. It is commonly used in power distribution systems to step down high voltage electricity for use in homes and businesses.

## 2. How does the polarity of a 3p core transformer affect its performance?

The polarity of a 3p core transformer determines the direction of the induced voltage in its windings. If the polarity is reversed, the transformer will not function properly and may cause damage to the electrical system.

## 3. What is the difference between positive and negative polarity in a 3p core transformer?

The difference between positive and negative polarity in a 3p core transformer is the direction in which the induced voltage flows. Positive polarity means the induced voltage flows in the same direction as the primary voltage, while negative polarity means it flows in the opposite direction.

## 4. How is the polarity of a 3p core transformer determined?

The polarity of a 3p core transformer is determined by the way the windings are connected. The primary and secondary windings must be connected in the same order for the polarity to be correct. This can be verified using a polarity tester or by following manufacturer's instructions.

## 5. Can the polarity of a 3p core transformer be changed?

Yes, the polarity of a 3p core transformer can be changed by rewiring the windings in the desired configuration. This should only be done by a trained professional to avoid damaging the transformer or causing safety hazards.

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