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Positive sequence impedance of a transformer is equal to negative sequence impedance

Fault level = 666.67 MVA

100s

Voltages used are 1.5kV DC and 25kV AC for mainline trains.

21 is the decimal number for 10101

Inverse square law ? The illumination of a surface receiving its flux from a point source is inversely proportional to the square of the distance between the surface and the source.

At leading power factor the voltage regulation is given by I*(Rcosf- Xsinf). Thus, at a particular condition of angle f we may get zero voltage regulation. While in lagging power factor case we have sign in the above formula

The per unit value of any parameter of a transformer remain same irrespective of whether it is referred to primary or secondary

The effect of addition of zero to the open loop transfer function is pulling the root locus to the left and to speed up the setting of response

The polar plot of a sinusoidal transfer function G(j?) is a plot of the magnitude of G(j?) versus the phase angle of G(j?) on polar co-coordinates as ? is varied from zero to 8

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