To conduct the polarity test on a 1-phase transformer

Aim

To conduct the polarity test on a 1-phase transformer

Apparatus Required:

Name plate details:-

Transformer Specifications:

Transformer Rating :( in KVA) _________

Winding Details:

LV (in Volts): _______________________

LV side current:_____________________

HV (in Volts): ______________________

HV side Current:___________________

Type (Shell/Core):___________________

Auto transformer Specifications:

Input Voltage (in Volts):______________

Output Voltage (in Volts): ____________

frequency (in Hz):____________________

Current rating (in Amp):_____________

Circuit Diagram:

(A) For D.C Supply:

(B) For A.C Supply:

Procedure:-

For D.C. Supply:

1. Make the connection as per circuit diagram
2. By varying the potential divider set the input voltage to 10 V.
3. Close the SPST switch and observe the deflection in voltmeter V ₂
4. If the direction of pointer in V₂ is positive then A₁ is positive with respective A₂ and also a₁ is positive with respective a₂.

For A.C. Supply:

1. Make the connections as per the circuit diagram.
2. Apply 20V, by varying auto transformer
3. Observer V₁& V₂
4. If V₂ is less than V₁ then assumed polarity in circuit1 is correct otherwise polarity is opposite.

Result:For given transformer polarity test is performed