Related Topics

  Protection of Transformer  Equivalent Circuit diagram of single phase Transformer   Core type Transformer and Shell type Transformer  Transformer with winding Resistance and Magnetic Leakage  Transformer with winding Resistance but No Magnetic Leakage  Equivalent Resistance of single phase Transformer  Magnetic leakage of Single Phase Transformer  Oil Flow Indicator of the pump of Power Transformer  Silica Gel Breather of Transformer  Oil Pump of Transformer   Radiator of Transformer and working of Radiator  PRD of Transformer  MOG ( magnetic oil gauge ) of Transformer  Bushing of Transformer ( for H.V side and L.V side )  WTI and OTI of Transformer  Buchholz Relay of Transformer and Working of Buchholz Relay  Conservator tank of Transformer  What is a Power Transformer ?  Short Circuit Test or Full load Cu loss of Transformer   Open circuit test or No load Test of Transformer   Parallel operation of 3-phase Transformer  Earthing or Neutral Grounding Transformer   Transformer on On load Condition   What is a Transformer ?  E.m.f Equation of Transformer   Transformer on No load Condition

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SymbolsTransformerRelayPower-SystemBasic-electricalACSR-ConductorCircuit-BreakerInterview-questions-of-Basic-ElectricityInterview-questions-of-transformerInsulatorCurrent-TransformerMCQMCQ-powersystemThermal-power-stationInterview-questions-of-Power-SystemPower-ElectronicsInterview-questions-of-Underground-CableInterview-questions-of-IlluminationIlluminationMCQ-of-ElectronicsMCQ-of-Basic-ElectricalMCQ-of-Transformers MCQ-of-D.C-motor MCQ-of-D.C-generators

Transformer on No load Condition

No load Transformer means a transformer which has no load connection at secondary winding only normal voltage is applied at the primary winding. Let  V1  is applied at the primary winding.  After applying A.C voltage V1, it is seen that small amount of current  I0 flows through the primary winding. In case of Ideal Transformer, no load primary current (I0) will be equal to magnetizing current (Iµ) of the transformer. We assumed there is no core losses and copper loss, So  I0 =Iµ . But, in case of actual transformer, there is two losses, i.e  i) Iron Losses   in the core i.e hysteresis loss and eddy current loss  , ii) and a very small amount copper loss in the primary winding.

So, the primary current  I0 has two components:

  1. Iw = Iron loss component which is same ph of applied voltage V1.
  2. Iµ = magnetizing component which is 90⁰ behind V1.
 

Hench, the primary current I0 is vector summation of Iµ & Iw , So, we can write that I0 = (Iµ2 + Iw2)  and  is not a 90⁰ behind  V1, but lags it by an angle  φ < 90⁰  Which is shown in figure. And no load input power,    W 0  = V1 I0Cose φ0  .   The magnitude of no load primary current is very small as compared to the full-load primary current. It is 1 percent of the full-load current. As  I0 is very small, the no load  primary Cu loss is negligible which means that no load primary input is practically equal to the iron loss in the transformer.

  

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