Essential condition for parallel operation of two single
phase transformer is that they should have same
A polarity B kVA rating
C voltage ratio D % impedance
Answer / cyril
A, C and D.
Polarities of the two transformers must be the same. Otherwise, emf inducted in the 2 secondaries in parallel will cause a flow of circulating current through them, even without a connected load.
Voltage ratios must be the same. Otherwise, there will also be a flow of circulating current in the 2 secondaries if there is a voltage ratio difference.
Percentage impedance must be the same since load sharing of the transformers in parallel depends on the percentage impedance of the transformers.
Is This Answer Correct ? | 11 Yes | 3 No |
How does a VOLTAGE OPERATED DIFFERENTIAL RELAY work??
what is sf6 where it is use & working or function ?
why are we adopting 132kv,220kv for transmission rather than using 440kv at all transmission lines as it gives lower losses?
what is power factor
How many types of DC current
what are clipper and clamper circuits?
explain maximum demand factor
In directional earth fault protection for generator, one core balance CT is for residual current, what other CT is for, which is placed on neutral?
3,12,24,33,_ ,75,150 Find the missed number in this sequence
What is the difference between automatic & semi-automatic star-delta starters?
What Is Transformer Impedance ?
How to confirm the Phase shifting Transformer VECTOR GROUP relation , as below ZNy11.45d10.45-ZNYy0.15d11.15