Answer / zan

Reactance is a circuit element's opposition to an
alternating current, caused by the build up of electric or
magnetic fields in the element due to the current. Both
fields act to produce counter EMF that is proportional to
either the rate of change (time derivative), or
accumulation (time integral) of the current. In vector
analysis, reactance is the imaginary part of electrical
impedance, used to compute amplitude and phase changes of
sinusoidal alternating current going through the circuit
element. It is denoted by the symbol . The SI unit of
reactance is the ohm.

in case of auto transformer the windings of transformer
itself makes the reactance.

suppose MCC (Motor control center)panel work on field the relay on this damage or not work and earth fault occurs in this and no indication in relay panel given below. than MCB trip or not and what effect the panel how find relay will damage or not work.

2 Answers  

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FOR 16/20 MVA 132/33 KV ONAN/ONAF TYPE TRANSFORMER IT IS DESIGNED FOR 16 MVA WITH ONAN CONDITION.IT BECOMES 20 MVA UNDER ONAF CONDITION.LOAD LOSS IS GUARANTEED FOR 65KW AT 20 MVA AND % IMPEDANCE 13.75. PLEASE TELL US AT WHAT LOAD LOSS AND % IMPEDANCE IT SHOULD BE DESIGNED FOR 16 MVA AND WHAT WILL BE ITS EFFICIENCY AT 20 MVA?

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