REGULATING TRANSFORMER

May 27 • Engineering Notes • 96 Views • 1 Comment

REGULATING TRANSFORMERS:

Regulating Power Transformer

Regulating Transformer

REGULATING TRANSFORMER:

The transformers which  can vary voltage or phase angle of an output circuit are known as regulating transformer.In other word over all control of transformer is in our hand that is we can control current, voltage and phase angle.All the mentioned parameters are adjustable according to situation.

Regulation in a transformer can be made by following ways:

  • Voltage regulating transformer
  • Phase angle regulating transformer
  • OLTC regulating transformer

Here we will discuss detail about voltage regulating transformer.

VOLTAGE REGULATING TRANSFORMER:

First of all we will know about voltage regulation,

VOLTAGE REGULATION:

The voltage regulation is defines as the percentage of voltage diffrence between no load voltages of a transformer with respect to full load voltage.

VOLTAGE REGULATION OF TRANSFORMER:

If a electrical power transformer is open circuited which means load is not connected with secondary terminal,in such situation the secondary terminal  voltageof the transformer will be its secondary EMF that is E2.And when full load is connected with secondary terminalof the transformer than rated current I2 folws through the secondary circuit,at the same time primary winding will also draw equivalent full load current from the source.The voltage drop in the secondary will be I2Z2 in which Z2 is secondary impedence of transformer and now at same loading condition if we measure the voltage between secondary terminal we will get voltage V2 across load terminals which is less than no load secondary voltage E2 and this is due to I2Z2 voltage drop in the transformer.

EXPRESSION FOR VOLTAGE REGULATING TRANSFORMER:

Here expression for voltage regulating transformer is represented by percentage that is

Voltage regulation(%)=E2-V2/V2×100 %

CAPABLITY CURVES FOR ALTERNATOR:

Capablity curve for an alternator is plotted by taking P in the ordinate  andQ in absicca,where P is the output power of alternator,Ş is tourque angle between two magnetic field.

IMG_20130510_183839_0

Any operation within the boundary of the curve is safefrom heating and stability.If poi t S0 is located having active power P0 and Q0the following results are available.

  • S0=P0+jQ0
  • The machine will not geet over heated and will remain stable if S0 is inside capablity curve
  • Ş or tourqe angle is the angle between Q-axis  and the line drawn from S0 to origin of field current If axis
  • Above the length of line2 is the measure of the field current required to operate at value of P=P0 and Q=Q0 with rated terminal voltage
  • A line drawn from S0to the origin of Q axis will be at angle ő0 from the origin.

IMPORTANT QUESTIION:

1-Define regulating transformer?

Ans- The transformers which are used in which we can vary voltage or phase angle of an output circuit are known as regulating transformer

2-In how many ways regulation in a transformer can be maded?

Ans- Regulation in a transformer can be made by following ways:

  • Voltage regulating transformer
  • Phase angle regulating transformer
  • OLTC regulating transformer

3-Define voltage regulation and describe voltage regulating transformer?

Ans- The voltage regulation is defines as the percentage of voltage diffrence between no load voltages of a transformer with respect to full load voltage.                                                                                                   If a electrical power transformer is open circuited which means load is not connected with secondary terminal,in such situation the secondary terminal  voltageof the transformer will be its secondary EMF that is E2.And when full load is connected with secondary terminalof the transformer than rated current I2 folws through the secondary circuit,at the same time primary winding will also draw equivalent full load current from the source.The voltage drop in the secondary will be I2Z2 in which Z2 is secondary impedence of transformer and now at same loading condition if we measure the voltage between secondary terminal we will get voltage V2 across load terminals which is less than no load secondary voltage E2 and this is due to I2Z2 voltage drop in the transformer.

4-Write down the expression for  voltage regulating transformer?

Ans- Voltage regulation(%)=E2-V2/V2×100 %

5-Write down some conclusion of capablity curves for alternator?

Ans-Following conclusion were made:

  • S0=P0+jQ0
  • The machine will not geet over heated and will remain stable if S0 is inside capablity curve
  • Ş or tourqe angle is the angle between Q-axis  and the line drawn from S0 to origin of field current If axis
  • Above the length of line2 is the measure of the field current required to operate at value of P=P0 and Q=Q0 with rated terminal voltage
  • A line drawn from S0to the origin of Q axis will be at angle ő0 from the origin

 

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    A transformer is a static electrical device that transfers energy by inductive coupling between its winding circuits. A varying current in the primary winding creates a varying magnetic flux in the transformer’s core and thus a varying magnetic flux through the secondary winding.

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